sharp_vc-a560u_h960u_h961u_[ET]

5/27/2018 sharp_vc-a560u_h960u_h961u_[ET]

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VC-A560U(A)/A560U/VC-H960U/H960U(B)/

S41R7VC-A

SERVICE MANUAL

This document has been published to be used for

after sales service only.The contents are subject to change without notice.SHARP CORPORATION

VIDEO CASSETTE RECORD

In the interests of user-safety (Required by safety regtions in some countries) the set should be restored tooriginal condition and only parts identical to those specibe used.

VC-A560U(A)VC-A560U/A560U(VC-H960U/H960U(VC-H961U

CONTENTS

Page

1. GENERAL INFORMATION ........................................................................................................... 5

2. DISASSEMBLY AND REASSEMBLY ........................................................................................... 7

3. FUNCTION OF MAJOR MECHANICAL PARTS ......................................................................... 10

4. ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITS ........................ 12

5. ELECTRICAL ADJUSTMENT ..................................................................................................... 30

6. MECHANISM OPERATION FLOWCHART AND TROUBLESHOOTING GUIDE ...................... 32

7. TROUBLESHOOTING ................................................................................................................ 38

8. BLOCK DIAGRAM....................................................................................................................... 50

9. SCHEMATIC DIAGRAM AND PWB FOIL PATTERN ................................................................. 58

10. REPLACEMENT PARTS LIST .................................................................................................... 7111. EXPLODED VIEW OF MECHANICAL PARTS ........................................................................... 80

12. PACKING OF THE SET .............................................................................................................. 85

VC-H961U ......................Models for CanadaVC-A560U(A)/A560U/A560U(B)/H960U/H960U(B) .................Models for U.S.A

MODELS

SERVICE

MANUAL

MODELSVC-A560U(A)/A560U/A560U(B)/H960U/H960U(B)/H961U

VIDEOCASSETTERECORDER

VC-H961U

VC-A560U(A)/A560U/A560U(B)

VC-H960U/H960U(B)


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VC-A560U(A)/A560U/A560U(B)VC-H960U/H960U(B)/H961U

IMPORTANT SERVICE NOTES

WARNING : TO REDUCE THE RISK OF FIRE OR ELEC-TRIC SHOCK, DO NOT EXPOSE THIS AP-PLIANCE TO RAIN OR MOISTURE.

RISK OF ELECTRIC SHOCKDO NOT OPEN

CAUTION

CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK. DONOT REMOVE COVER. NO USER-SERVICEABLEPARTS INSIDE. REFER SERVICING TO QUALIFIEDSERVICE PERSONNEL.

This symbol warns the user of uninsulated voltagewithin the unit that can cause dangerous electric shocks.

This symbol alerts the user that there are importantoperating and maintenance instructions in the literatureaccompanying this unit.

This symbol mark means fast operating fuse.For continued protection against risk of fire, replaceonly with same type fuse F901 (3.0A, 125V).

CAUTION:

BEFORE RETURNING THE VIDEO CASSETTERECORDER

Before returning the video cassette recorder to the user,perform the following safety checks.

1. Inspect all lead dress to make certain that leads are

not pinched or that hardware is not lodged betweenthe chassis and other metal parts in the video cassetterecorder.

2. Inspect all protective devices such as non-metalliccontrol knobs, insulation materials, cabinet backs,adjustment and compartment covers or shields, isola-tion resistor/capacitor networks, mechanical insula-tors etc.

3. To be sure that no shock hazard exists, check forcurrent in the following manner.

Plug the AC line cord directly into a 120 volt AC outlet(Do not use an isolation transformer for this test).

Using two clip leads, connect a 1.5k ohm, 10 wattresistor paralleled by a 0.15F capacitor in series withall exposed metal cabinet parts and a known earth

ground, such as a water pipe or conduit. Use an SSVM or VOM with 1000 ohm per volt, or

higher, sensitivity or measure the AC voltage dropacross the resistor (See Diagram).

Move the resistor connection to earth exposed metalpart having a return path to the chassis (antenna,metal cabinet, screw heads, knobs and control shafts,

etc.) and measure the AC voltage drop across theresistor. Reverse the AC plug on the set and repeatAC voltage measurements for each exposed part.Any reading of 0.45V rms (this corresponds to 0.3mArms AC.) or more is excessive and indicates a poten-tial shock hazard which must be corrected beforereturning the video cassette recorder to the owner.

3.0A 125V

SSVMAC SCALE

1.5k ohms.10W

CONNECT TOKNOWN EARTHGROUND

TO EXPOSEDMETAL PARTS

0.15 FTEST PROBE


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VC-A560U(A)/A560U/VC-H960U/H960U(B)/

NOTES DE SERVICE IMPORTANTES

ATTENTION: POUR REDUIRE LES RESQUES D'IN-CENDIE OU DE CHOC ELECTRIQUE,NE PAS EXPOSER CET APPAREIL ALA PLUIE OU A L'HUMIDITE.

RISQUE DE CHOC ELECTRIQUENE PAS OUVRIR

ATTENTION

Ce symbole avertit l'utilisateur que des instructionsimportantes relatives l'utilisation et l'entretien setrouvent dans le manuel accompagnant l'appareil.

ATTENTION: AFIN DE REDUIRE LES RISQUES DE CHOCELECTRIQUE, NE PAS RETIRER LE COUVERCLE,AUCUN ORGANE INTERNE NE PEUT ETREREPARE PAR L'UTILISATEUR. CONFIERL'APPAREIL A UN DEPANNEUR QUALIFIE.

Ce symbole signale l'utilisateur la prsence d'unetension non isole l'intrieur de l'appareil qui peut trela cause de secousses lectriques dangereuses.

PRECAUTION:

Cette marque indique le fusible action in stantanse.Pour la protection continue contre le risque d'incendie,ne remplacer que par le fusible type F901 (3,0A, 125V).

AVANT DE RENDRE LE MAGNETOSCOPE

Avant de rendre le magntoscope lutilisateur, effectuerles vrifications de scurit suivantes.

1. Vrifier toutes les gaines de fil pour tre sr que les filsne sont pas pincs ou que le matriel nest pas coincentre le chssis et les autres pices mtalliques dansle magntoscope.

2. Vrifier tous les dispositifs de protection tels que lesboutons de commande non mtalliques, les matriauxdisolement, le dos du coffret, les couvercles decompartiment et ajustement ou les boucliers, lesrseaux de rsistance / condensateur disolement, Iesisolateurs mcaniques, etc.

3. Pour tre sr quil ny a aucun risque de choc lectrique,vrifier le courant de fuite de la manire suivante.

Brancher le cordon dalimentation secteur directementdans une prise de courant de 120 volts. (Ne pas utiliserde transformateur disolement pour cet essai).

Utiliser deux fils pinces et connecter une rsistancede 10 watts 1,5 kohm en parallle avec un condensateurde 0,15 F en srie avec des pices du coffret

mtallique exposes et une masse de terre connuetelle quun tuyau ou un conduit deau.

Utiliser un VTVM ou VOM avec une sensibilit de 1000ohms par volt ou plus ou mesurer la chute de tensionCA entre la rsistance (voir diagramme).

Dposer la connexion de la rsistance toutes les

pices mtalliques exposes ayant un parcours dretour au chssis (connexions dantenne, coffrmtallique, ttes de vis, boutons et arbres dcommande, etc.) et mesurer la chute de tension Centre la rsistance. Inverser la fiche CA (une fichintermdiaire non polarise doit tre utilise seule de faire ces vrifications.) sur lappareil et rpter lmesures de tension CA pour chaque pice mtalliqexpose. Toute lecture de 0,45 Vrms (ceci correspo 0,3 mArms CA) ou plus est excessive et signale danger de choc qui doit tre corrig avant de rendremagntoscope son utilisateur.

3,0A 125V

0,15 FSONDE D'ESSAI

VERS PIECESMETALLIQUESEXPOSEES

VTVMECHELLE CA

1,5 KOHMS10W

CANNECTER UNE MASSE DTERRE CONN


4/784


PRECAUTIONS IN PART REPLACEMENT

When servicing the unit with power on, be careful to the section marked white all over.

This is the primary power circuit which is live.

When checking the soldering side in the tape travel mode, make sure first that the tape has been loaded and then turn

over the PWB with due care to the primary power circuit.

Make readjustment, if needed after replacement of part, with the mechanism and its PWB in position in the main frame.

(1) Start and end sensors: Q701 and Q702Insert the sensors projection deep into the upper hole of the holder. Referring to the PWB, fix the sensors tight

enough.

(2) Photocoupler: IC901Refer to the symbol on the PWB and the anode marking of the part.

(3) Cam switches A and B: S704: QSW-RA001WJZZ.Adjust the notch of the part to the white marker of the symbol on the PWB. Do not allow any looseness.

(4) Take-up and supply sensors: D707 and D706.

Be careful not to confuse the setting direction of the parts in reference to the symbols on the PWB. Do not allow anylooseness.


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VC-A560U(A)/A560U/VC-H960U/H960U(B)/

1. GENERAL INFORMATION1-1 FEATURESOnly for VC-H960U/H960U(B)/H961U Hi-Fi Stereo Sound Built-in MTS (Multi-channel TV Sound) DecoderOnly for VC-H961U Built-in Front AV Jacks

Common Features EZ Set Up

S-VHS Quasi Playback Double-Azimuth 4-Heads 19Clear Picture System (in EP mode) HQ System for Better Resolution and Color Reproduction Multi-Language (English/Spanish/French) OSD (On Screen

Display) with Menu Screen Guidance 181-channel PLL Quartz Synthesized Random Access Tuner

with Automatic Channel Setting Quick Start with Full Loading Mechanism 1-Year, 8 Event Programmable Timer

Simple Recording Timer Universal Remote Control Sharp Super Picture 5 sec. Timer Backup

Field-Still/Variable Slow/Frame Advance Real-Time Counter (On Screen Display) Automatic Daylight Saving-Time (D.S.T.) Adjustment Blue Screen Noise Elimination Auto Tracking Control System Digital Program Search System (DPSS) Skip Search Instant Replay Auto Zero Back Recorded Section Auto Repeat Full Automatic Playback Tamper Proof Up to 8 Hours of Recording and Playback (with T-160

cassette)

1-2 SPECIFICATIONSFormat: VHS NTSC Standard

Video Recording System: Rotary Two-Head Helical Scan SystemNumber of Video Heads: 4

Video Signal Standard: NTSC Color SystemAudio Recording System: 1 Stationary Head for Linear Audio

2 Rotary Heads for Hi-Fi stereo (Only for Hi-Fi models)Tape Width: 12.7 mm (1/2 inch)

Tape Speed: (SP) 33.35 mm/sec. (1.31 i.p.s.)(LP) 16.67 mm/sec. (0.66 i.p.s.) (playback only)(EP) 11.12 mm/sec. (0.44 i.p.s.)

Maximum Recording Time: (SP) 160 min. (T-160)

(EP) 480 min. (T-160)Channel Coverage: VHF 2-13UHF 14-69CATV 1-125

Antenna Input: 75 OhmVideo Input: 0.5 to 2.0 Vp-p, 75 Ohm unbalanced

Video Output: 1.0 Vp-p, 75 Ohm unbalancedAudio Input: 8 dBs, 47 kOhm unbalanced (0 dBs = 0.775 Vrms)

Audio Output: 8 dBs, 1 kOhm unbalanced (0 dBs = 0.775 Vrms)Hi-Fi Audio (Only for Hi-Fi models):

Dynamic Range: 90 dBFrequency Response: 20 Hz-20 kHz

Memory Backup: 5 sec.Operating Temperature: 5C to 40C (41F to 104F)

Storage temperature: 20C to 60C (4F to 140F)

Power Source: 120 V AC, 60 HzPower Consumption: 14 WDimensions (approx.): 360 (W) x 92.5 (H) x 229 (D) mm (14-3/16" x 3-41/64" x 9-1/64")

Weight (approx.): 2.3 kg (5.1 lbs)Accessories included: 75 ohm coaxial cable, Operation manual, Infrared remote control, Battery (2 p

Note: Specifications are subject to change without notice.


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1-3 LOCATION OF MAJOR COMPONENTS AND CONTROL

LEDIndicator(explainedthroug

houttheoperationInstruction)

POWER

TIMER

3VCR

4REC

5

REMOTESENSOR

POWERLEDindicator

ThisindicatorlightsupwhenevertheVCRisturned

on.

TIMERLEDindicator

ThisindicatorlightsupwhentheVCRissetfortime

r

recording,SimpleRecordingTimerandRecordingw

ith

theTimer.

3

VCRLEDindicator

Thisindicatorlightsupwhenselecting"VCR"byusing

theTV/VCRbutton.

4

RECLEDindicator

Thisindicatorlightsuponduringrecording.T

hisindicator

flashesduringREC-Pause.

5

RemoteSensor

PointRemoteControlatthiswindow.

Cassettecompartm

ent(seePlayback/Recording)

POWERbutton

(WhenpressedtoturnontheVCR,POWERLEDindicator

willlightup.Whenthepoweristurnedoff.POWERLED

indicatorwilturnoff.)

Basicfunctioncontrols

(seePlayback/Recording)

(VC-H961U)


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VC-A560U(A)/A560U/VC-H960U/H960U(B)/

2. DISASSEMBLY AND REASSEMBLY

2-1 DISASSEMBLY OF MAJOR BLOCKS

TOP CABINET : Remove 2 screws1.FRONT PANEL : Remove 2 screws2and 7 clips3.OPERATION : Remove 1 screw4.PWBSHIELD ANGLE : Remove 1 screw5with shield angle.MECHANISM/ : Remove 1 screw 6, 2 screws 7.MAIN PWB Remove 1 screw 8with antenna

terminal cover. Remove 1 screw9with top cabinet fix angle.

ANTENNATERMINALCOVER

MAIN FRAME

TOP CABINET

TOP CABINEFIX ANGLE

OPERATION PWB

LED HOLDER

MECHANISM/MAIN PWBASSEMBLY

ANTENNATERMINALCOVER

FRONT AVJACK

8

8

1

C

26

2

6

6

9

4

B

BB

B

A A

A

B

A

7

A

V C -A 5 6 0 U (A )V C -A 5 6 0 UV C -A 5 6 0 U (B )

V C -A 5 6 0 U (A )V C -A 5 6 0 UV C -A 5 6 0 U (B )V C -H 9 6 0 UV C -H 9 6 0 U (B )

V C -H 9 6 0 UV C -H 9 6 0 U (B )V C -H 9 6 1 U

V C -H 9 6 1 U

V C -H 9 6 1 U

Front Panel

Front Panel

B

3

3

B

3

3


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MECHANISM CHASSIS

2-2 DISASSEMBLING THE MECHANISM/MAIN PWB ASSEMBLY

1. When removing the mechanism from the main PWB,remove the antenna cover 1 screw1, and remove theantenna terminal cover.Remove the screw2which connecting the PWB andthe mechanism.Take out vertically the mechanism so that it does notdamage the adjacent parts.

2. Removing the mechanism and cassette housing.Remove 2 screws3fixing the cassette housing to themechanism, and remove the cassette housing.

3

CASSETTEHOUSING

MAIN PWB

VC-H961U

1

2


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VC-A560U(A)/A560U/VC-H960U/H960U(B)/

2-3 CARES WHEN REASSEMBLING

INSTALLING THE CASSETTE HOUSING

When the cassette housing is installed on the mechanism,the initial setting is essential condition.There are two initial setting methods, namely electrical andmechanical.1. Electrical initial setting

So as to perform initial setting of mechanism execute the

Step 1 of Installation of cassette housing. After ascertainingthe return to the initial setting position install the cassettehousing. (Conditions: When mechanism and PWB havebeen installed)

2. Mechanical initial setting

After ascertaining the return to the initial set position inthe cassette housing in the specified position. (This meis applied only for the mechanism.)

INSTALLING THE MECHANISM ON PWB

Lower vertically the mechanism, paying attention to themechanism edge, and install the mechanism with due careso that the parts are not damaged. So as to fix the mecha-nism to the main PWB install two housings. (Fit the antennacover to one of them.

PARTS WHICH NEED PARTICULAR CARE

When installing the mechanism chassis on the PWBtake care so as to prevent deformation due to contamechanism chassis with REC TIP SW.

Master cam

Push up

Drive lever

DRUM CONNECTOR

AE CONNECTOR

END SENSOR

VC-H961H

END TIP SW

AC HEAD CONNECTOR

START SENSOR


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3. FUNCTION OF MAJOR MECHANICAL PARTS (TOP VIEW)

No. Function No. Function

1 Full erase head

2 Supply pole base assy

3 Tension arm

4 Idler wheel assy

5 Open guide

6 Supply reel disk

7 Supply main brake

8 Take-up main brake

9 Pinch drive cam

10 A/C head assy

11 Reverse guide lever assy

12 Reel relay gear

13 Take-up reel disk

14 Pinch roller lever assy

15 Drum ass'y

16 Loading motor block

17 Drum driver motor

18 Take-up pole base ass'y

17 15

11

5

9

14

12

8

16

1346

2

7

3

1

18 10


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VC-A560U(A)/A560U/VC-H960U/H960U(B)/

FUNCTION OF MAJOR MECHANICAL PARTS (BOTTOM VIEW)

No. Function No. Function

19 Syncro Gear

20 Master cam

21 Capstan D.D. motor

22 Reel belt

23 Clutch lever

24 Limiter pulley assy

25 Shifter

25

24

21

22

19

20

23


12/7812


VROATSV CD

11.

10. JiGDRiVER-6 BM

9. JiGDRiVERH-4 AP

4. Torque Driver JiGTD1200 CB

4. ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITSThe explanation given below relates to the on-site general service (field service) but it does not relates to the adjustmentand replacement which need high-grade equipment, jigs and skill. For example, the drum assembling, replacement andadjustment service must be performed by the person who have finished the technical courses.

4-1 MECHANISM CONFIRMATION ADJUSTMENT JIG

So as to perform completely the mechanism adjustment prepare the following special jigs. So as to maintain the initial

performance of the machine the maintenance and check are necessary. Utmost care must be taken so that the tape isnot damaged. If adjustment needs any jig, be sure to use the required jig.

JiGTG1200 CN

JiGMP0001 BY

1. Torque Cassette Meter JiGVHT-063 CZ

No. Jig ltem Part No. Code Configuration Remarks

JiGTG0090 CM

3. Torque Gauge Head JiGTH0006 AW

JiGRH0002 BR

JiGSG2000 BS

JiGSG0300 BF

7. JiGADP003 BK

Tension Gauge

These Jigs are used for checkingand adjusting the reel disk height.

When fixing any part to the threadedhole using resin with screw, use the

jig. (Specified torque 5 kg)

This cassette torque meter is used for check-ing and adjusting the torque of take-up formeasuring tape back tension.

These Jigs are used for checkingand adjusting the torque of take-up

and supply reel disks.

Master Plane Jig andReel Disk HeightAdjusting Jig

Pinch pressing forcemeasuring jig

This Jig is used with the tensiongauge. Rotary transformer clearanceadjusting jig.

There are two gauges used for thetension measurements, 300 g and2.0 kg.

These tapes are especially used forelectrical fine adjustment.

Video Audio HiFi Audio Track

525 Monoscope 7k 58m

NTSC Color Bar 1k 58m

VROEFZCS BGOR

VROEFZHS BH

1k

This screwdriver is used for adjusting theguide roller height.

For X value adjustment

This Jig is used for adjustmentof tension pole.

X value adjustmentgear driver

Tension PoleAdjustment Driver

2.3k

Black Level(only SYNC) signal

19m

2. Torque Gauge

6.

5.

8. Alignment Tape

Guide roller heightadjustment driver


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VC-A560U(A)/A560U/VC-H960U/H960U(B)/

4-2 MAINTENANCE CHECK ITEMS AND EXECUTION TIME

Perform the maintenance with the regular intervals as follows so as to maintain the quality of machine.

NOTE : Part replacement. : Cleaning : Apply grease Cleaning liquid Industrial ethyl alcohol

* This mechanism does not need electric adjustment with variable resistor. Check parts. If any deviation is foundclean or replace parts.

Maintained

PartsRemarks

500hrs.

1000hrs.

1500hrs.

2000hrs.

Possible symptom

encountered

Guide roller assy

Sup guide shaft

Reverse guide

Slant pole on pole base

Full erase head

A/C head

Upper and lower drum assy

Capstan D.D. motor

Pinch roller

Reel belt

Tension band assy

Loading motor

Idler assy

Limiter pulley

Supply/take-up main brake levers

Colour and beating

Small sound or sounddistortion

Poor S/N ratio, no colourPoor flatness of theenvelope with alignmenttape

No tape running,

uneven colourNo tape running, tapeslack

No tape running, tapeslack, no fast forward/rewind motion

Lateral noises Headoccasionally blocked

Abnormal rotation or significavibration requires replaceme

Clean tape contact part with specified cleaning liquid.

Clean tape contact area withspecified cleaning liquid.

Clean rubber and rubber conarea with the specified cleanliquid.

Screen swaying

Cassette not loaded orunloaded

No tape running, tapeslack

Tape slack

Video head cleaning procedure1. Apply one drop of cleaning liquid to the cleaning paper with the baby oiler.2. Gently press the cleaning paper against the video head to fix your finger, and move the upper drum so that each

is passed to and fro 5 times (do not move the cleaning paper).3. Wipe with the dry cleaning paper.

Notes : Use the commercially available ethanol of Class 1 as

cleaning liquid. Since the video head may be damaged, do not move up

and down the cleaning paper. Whenever the video head is cleaned, replace the clean-

ing paper. Do not apply this procedure for the parts other than the

video head.

Parts Code Description CZPAPRA56-001E Cleaning PaperZOiLR-02-24TE Babe Oiler (Spoit)

Gently press the cleaning paper tofix with your finger, and rotate theupper drum to clean.Move to and fro 5 times for each head.(Do not move the cleaning paper.)

Rotate the upper drumwith one hand.


14/7814


Figure 4-1.

Reassembly1. Before installing the cassette housing control, short-

circuit between TP803 and TP802 provided at mainPWB, press the eject button. The master cam turns andstops when the positioning mark appears. Fit the drivelever to master cam through main chassis, and push upthe drive lever.

Figure 4-2.

2. Install in the reverse order of removal.

Notes:1. In the case when you use the magnet screw driver, never

approach the magnet driver to the A/C head, FE head,and drum.

2. When installing or removing, take care so that thecassette housing control and tool do not contact theguide pin or drum.

3. After installing the cassette housing control once per-form cassette loading operation.

4-4 TO RUN A TAPE WITHOUT THE CASSETTEHOUSING CONTROL ASSEMBLY

1. Remove the full-surface panel.2. Short-circuit between TP803 and TP802.3. Plug in the power cord.4. Turn off the power switch.

(The pole bases move into U.L.position.)5. Open the lid of a cassette tape by hand.6. Hold the lid with two pieces of vinyl tape.7. Set the cassette tape in the mechanism chassis.8. Stabilize the cassette tape with a weight (500g) to

prevent floating.9. Turn on the power switch.10. Perform running test.

4-3 REMOVING AND INSTALLING THE CAS-SETTE HOUSING

Removal1. In the cassette removing mode, remove the cassette.2. Unplug the power cord.3. Remove in the following numerical order.

a) Remove two screws1.b) Pull the drive lever slide and pull up the cassette

housing control.

Figure 4-3.

Note:The weight should not be more than 500g.

To take out the cassette tape.1. Turn off the power switch.2. Take out the cassette tape.

1

Master cam

Push up

Drive lever

500g

Weight to preventfloat (500g)

Mechanism chassis


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VC-A560U(A)/A560U/VC-H960U/H960U(B)/

4-5 REEL DISK REPLACEMENT AND HEIGHTCHECK

Removal1. Remove the cassette housing control assembly.2. Remove the Supply/Take-up main brake ass'y.3. Pull the tension band out of the tension arm ass'y.4. Remove the reel disk.Note:Take care so that the tension band ass'y and main brake

ass'y are not deformed.

Notes:1. When installing the reel disk, take due care so tha

tension band ass'y is not deformed and grease doeadhere.

2. Do not damage the Supply main brake ass'y. Be caso that grease does not adhere to the brake surfa

Reassembly (Take-up reel disk)1. Clean the reel disk shaft and apply grease (SC-14

it.2. Align the phase of the reel disk to that of the reel

gear and to install a new take-up reel disk onto the s3. Check the reel disk height and reassemble the tak

main brake ass'y.Note:1. Take care so that the Take-up main brake ass'y i

damaged. Take care so that grease does not adherbrake surface.

2. After reassembly, check the video search rewind tension (see 4-10), and check the brake torque (se14).

Height checking and adjustmentNote:

1. Set the master plane with due care so that it doecontact the drum.

2. When putting the master plane, shift the reverse ga little in the loading direction. Care must be taken sexcessive shift results in damage.

Figure 4-4.

Note: Check that the reel disk is lower than part A but h

than part B. If the height is not correct, readjust thedisk height by changing the poly-slider washer undereel disk.

Reassembly (Supply reel disk)1. Clean the reel disk shaft and apply grease (SC-141) to

it.2. Match the phases of reel disk and reel relay gear, and set

the new reel disk.3. After checking the reel disk height, wind the tension

band ass'y around the reel disk, and hook to tension armass'y.

4. Assemble the Supply main brake ass'y.

Take-up reel diskSupply reel disk

TenTension arm ass'y

Supply main brake

Tension bandass'y

Take-up main brake ass'y

Supply reel disk

Take-up reel disk

Cassette lockrelease shaft

Master plane


16/7816


Note:Whenever replacing the reel disk, perform the height check-ing and adjustment.

Notes:1. Hold the torque gauge by hand so that it is not moved.2. Do not keep the reel disk in lock state. Do not allow long-

time measurement.

4-7 CHECKING AND ADJUSTMENT OF TAKE-UP TORQUE IN REWIND MODE

Remove the cassette housing control assembly.

After short-circuiting between TP803 and TP802

provided at operation PWB, plug in the power cord.

Setting1. Set a torque gauge to zero on the scale. Place it on the

supply reel disk.2. Press the rewind button.3. To calculate the remaining capacity, slowly rotate the

take-up reel disk, and then shift it into the rewind mode.

Checking1. Turn the torque gauge slowly (one rotation every 2 to 3

seconds) by hand in the CCW direction.2. Make sure that the indication of torque gauge is not less

than 30mNm (306gfcm).

AB

Figure 4-5.

Master planeReel disk heightadjusting jig

Mechanism chassis

Reel disk

10 0.2mm Reel disk

4-6 CHECKING AND ADJUSTMENT OF TAKE-UP TORQUE IN FAST FORWARD MODE


After short-circuiting between TP803 and TP802provided at operation PWB, plug in the power cord.

Setting

1. Set a torque gauge to zero on the scale. Place it on thetake-up reel disk.

2. Press the FF button.3. To calculate the remaining capacity of the play back

mode, slowly rotate the supply reel disk, and then shiftit into the forward mode.

Checking1. Turn the torque gauge slowly (one rotation every 2 to 3

seconds) by hand in the CW direction.2. Make sure that the indication of torque gauge is not less

than 30mNm (306gfcm).

Figure 4-7.

Torque gauge

30mNm (306gfcm)or more

Supply reel disk

Idler ass'y

The gauge is held atits maximum value.

(Red mark)

Adjustment1. If the rewind winding-up torque is less than the specified

value, clean the capstan D.D. worm gear, drive belt, andlimiter pulley with cleaning liquid, rewind again, andcheck the winding-up torque.

2. If the winding-up torque is still out of range, replace thedrive belt.

Figure 4-6.

Torque gauge

30mNm (306gfcm)or more

The gauge is held atits maximum value.(Red mark)

Idler ass'y

Adjustment1. If the FF winding-up torque is less than the specified

value, clean the capstan D.D. worm gear, drive belt, andlimiter pulley with cleaning liquid, and check again.

2. If the torque is less than the set value, replace the reelbelt.

CCW

CW


17/7817

VC-A560U(A)/A560U/VC-H960U/H960U(B)/

Notes:1. Hold the torque gauge by hand so that it is not moved.2. Do not keep the reel disk in lock state. Do not allow long-

time measurement.

4-8 CHECKING AND ADJUSTMENT OF TAKE-UP TORQUE IN RECORD/PLAYBACKMODE

Remove the cassette housing control assembly. After short-circuiting between TP803 and TP802provided at operation PWB, plug in the power cord.

Turn off the power switch. Open the cassette torque meter lid, and fix it with

tape. Load the cassette torque meter into the unit. Put the weight (500g) on the cassette torque meter. Turn on the power switch. Press the picture record button, and set EP picture

record mode (x3).

4-9 CHECKING AND ADJUSTMENT OF TAUP TORQUE IN VIDEO SEARCH REWMODE

Remove the cassette housing control assemb

After short-circuiting between TP803 and TP

provided at operation PWB, plug in the power c

SettingPress the playback button and rewind button to sevideo search rewinding mode.

CheckingPlace the torque gauge on the supply reel disk, and tcounterclockwise very slowly (one rotation every 1seconds) and check that the torque is within the set vchange to 14.1 3.5mNm. (144 35gfcm)

Set value EP change to 6.9 mNm (70 gfcm)

Figure 4-8.

Checking1. Make sure that value is within the setting 6.9 mNm

(70 gfcm).2. The winding-up torque fluctuates due to variation of

rotation torque of limiter pulley ass'y. Read the centervalue of fluctuation as setting.

3. Set the EP record mode (x3) and make sure that thewinding-up torque is within setting.

AdjustmentIf the playback winding-up torque is not within the setting,replace the limiter pulley assembly.Note:When the torque cassette is set, put a weight (500g) toprevent rise.When the cassette torque meter is taken out.Turn off the power switch.

Figure 4-9.

Note:Surely put the torque gauge on the reel disk to measuthe torque gauge is raised, accurate measuremeimpossible.

AdjustmentIf the rewinding playback winding-up torque is not withisetting, replace the limiter pulley assembly.

Note:The winding-up torque fluctuates due to variation of tion torque of supply reel disk. Read the center valufluctuation as setting.

Torque gauge

Supply reel disk

CCW

+2025

+2.02.5

+2.02.5

+2025

500g

Cassette torque meter


18/7818


Figure 4-11.

1. Detach the pinch roller from the capstan shaft.Do not separate excessively. Or the pinch lever andpinch double action lever may disengage.

2. Engage the tension gauge adapter with the pinch roller

shaft, and pull in the arrow direction.3. Gradually return the pinch roller, and measure the

pulling force when the pinch roller contacts the capstanshaft.

4. Make sure that the measured value is within settingchange to 9.8 1N (1.0 0.1kgf).

4-12 CHECKING AND ADJUSTMENT OFTENSION POLE POSITION




Setting1. Turn off the power switch.2. Open the cassette tape (T-120), and fix with tape.3. Set the cassette tape in loading state.4. Put the weight (500g) on the cassette tape.5. Turn on the power switch.6. Make the adjustment with the beginning of a T-120 tape.

4-10 CHECKING THE VIDEO SEARCH REWINDBACK TENSION



Checking1. After pressing the play button, press the rewind button,

and set the video search rewind mode.2. Place the torque gauge on the take-up reel disk, and turn

it counterclockwise very slowly (one rotation every 2 to3 seconds) and check that the torque is within the setvalue 3.4 1.5mNm (35 15gfcm).

Pinch rollerTension gauge900 - 1,200gf

Capstan shaft

Tension gauge adapter

Figure 4-10.

Torque gauge

Take-up reel disk

Notes:

Set the torque gauge securely on the take-up reel disk.If it is not secure, the measurement will be incorrect.

4-11 CHECKING THE PINCH ROLLERPRESSURE




Checking

Press the play button to set the playback mode.

CCW

Figure 4-12.

Checking1. Set a cassette tape, push the REC button to place the

unit in the SP record mode. Now check the tension poleposition.

5 0 0 g


(T-120)


19/7819

VC-A560U(A)/A560U/VC-H960U/H960U(B)/

2. Visually check to see if the position of the tension pole iswithin the 0 0.2mm from the left side line.

Insert the tension pole adjustment driver, and rotate clock-wise.

Figure 4-15.

At left side from the reference line. (A).

Figure 4-13.

Figure 4-14.

Insert the tension pole adjustment driver, and rotatecounterclockwise.

At right side from the reference line. (A).

Tension pole adjustment driver adjusting direction

Standard A = 0 0.2mm

4-13 CHECKING AND ADJUSTMENT RECORD/PLAYBACK BACK TENSIO

Remove the cassette housing control assemb

After short-circuiting between TP803 and TPprovided at operation PWB, plug in the power c

Setting1. Turn off the power switch.2. Open the torque cassette meter and fix with tape.3. Set the cassette tape in loading state.4. Put the weight (500g) on the cassette torque mete5. Turn on the power switch.

Make the adjustment with the beginning of a T-120 tape.

Figure 4-16.

Figure 4-17.

Checking1. Push the REC button to place the unit in the SP re

mode.2. At this time ascertain that the back tension is withi

setting change to 3.9 to 5.5mNm (40 to 56gfcmseeing the indication of torque cassette meter.

A

A

A

Tension poleadjustmentdriver

CW C

CW

5 0 0 g


Cassette torquemeter


20/7820


Adjustment1. If the indication of torque cassette meter is lower than

the setting, shift the tension spring engagement to thepart A.

2. If the indication of torque cassette meter is higher thanthe setting, shift the tension spring engagement to thepart B.

Checking the brake torque at the take-up side

Figure 4-20.

CCW: 4.41 1.5mNm (4515gfcm)

CW: 4.12 1.2mNm (4212gfcm)



Setting1. Switch from the FF mode to the STOP mode.2. Disconnect the power cord.3. Set a torque gauge to zero on the scale. Place it on the

take-up reel disk.

Checking1. Turn the torque gauge at a rate of about one turn/2 sec

in the CCW direction/CW direction so that the reel diskand torque gauge pointer rotates at equal speed andmake sure that the value is within the setting (CCWdirection: 4.41 1.5mNm (45 15gfcm), CW direction:4.12 1.2mNm (42 to 12gfcm).

2. Adjustment of the brake torque at the supply side and thetake-up side

Unless the supply side brake torque or take-up sidebrake torque is within the setting, clean the felt surfaceof reel disk (supply, take-up) brake lever, check againthe brake torque.

If value cannot be set within the setting yet, replace themain brake ass'y or main brake spring.

Figure 4-18.

4-14 CHECKING THE BRAKE TORQUE Checking the brake torque at the supply side

CCW: 4.41 15mNm (45 15gfcm)

CW: 4.121.2mNm (42 12gfcm)

Figure 4-19.



Setting1. Set a torque gauge to zero on the scale. Place it on the

supply reel disk.2. Switch from the FF mode to the STOP mode.3. Disconnect the power cord.

CheckingTurn the torque gauge at a rate of about one turn/2 secin the CW direction/CCW direction with respect to thesupply reel disk so that the reel disk and torque gaugepointer rotate at equal speed, and make sure that thevalue is within the setting (CW direction: 4.12 1.2mNm(42 12gfcm); CCW direction: 4.41 15mNm (45 15gfcm).

Tension arm

Tension spring

CW

CCW CW

Supply reel disk

Torque gauge

Torque gauge

CCW

Take-up reeldisk

A B


21/7821

VC-A560U(A)/A560U/VC-H960U/H960U(B)/

Figure 4-22.

Replacement1. Solder the removed PWB to the new head assembly.2. Adjust the height from the A/C head arm (lower surface)

to the A/C head plate to 10.8mm with slide calipers. (3places of azimuth screw section, tilt screw section and A/C head front section) (See the figure below.)

3. Align the left end of gear of A/C head arm witpunched mark of chassis, tentatively tighten the sc1so as to ensure smooth motion of A/C head Tightening torque must be 0.45 0.05Nm (40.5kgfcm).

4-15 REPLACEMENT OF A/C (AUDIO/CONTROL)HEAD

1. Remove the cassette housing control assembly.2. In unloading state unplug the power cord.

Removal1. Remove the screws123, Tilt screw.2. Unsolder the PWB fitted to the A/C head.Notes:1. When replacing, never touch the head. If you touched,

clean with the cleaning liquid.2. When removing the screw3, take care so that the

spring may out.

Figure 4-23.

Note:1. If the screw1 is tighten tentatively too loose

azimuth and height of A/C head may change when

are finally tightened. Therefore care must be take2. After completion of A/C head be sure to adjust

running. (Execute the running adjustment by the medescribed in 4-17.)

Figure 4-21.

Height screw

Left end of A/C head arm gearPunched line mark on chassis

13

1

2

AC head screw

Azimurh spring

Height adj. screw

AC head PWB ass'y(with A/E)

Tilt screw

Height Adj. spring

AC head PWBAzimuth adj. screw

*Derection designation.(The bottom part is big.)

A/C head plate

10.8mm

A/C head FFC

A/C FFC holder

Solder

AC head PWB

New A/C head ass'y

A/C head plate

*Fit the groove of FFC to

the boss of the holder.


22/7822


4-17 ADJUSTMENT OF TAPE DRIVE TRAIN1. Tape run rough adjustment1 Remove the cassette housing control assembly.2 After shortcircuiting between TP803 and TP802 pro-

vided at operation PWB, plug in the power cord.3 Check and adjust the position of the tension pole.

(See 4-12.)4 Check and adjust the video search rewind back

tension. (See 4-10.)

5 Connect the oscilloscope to the test point for PB ATRsignal output (TP201). Set the synchronism of theoscilloscope to EXT. The PB ATR signal is to betriggered by the head switching pulse (TP202).

6 Set the alignment tape (VROATSV) to play. (Put a500g weight on the cassette tape to prevent lift ofcassette tape.)

500g

Figure 4-26.

7 Press the tracking button (+), () and change theATR signal waveform from max to min and from minto max. At this time make sure that the ATR signalwaveform changes nearly parallel.

8 Unless the ATR signal waveform changes nearlyparallel, adjust the height of supply side and take-upside guide roller so that the envelope waveform

changes nearly parallel. (For ATR signal adjustmentprocedure refer to Figure 4-30.)9 Turn the tilt screw to remove the tape crease at the

fixing guide flange.Playback the tape and check for tape crease at thefixing guide flange.(1) If there is no tape crease

Turn the tilt screw clockwise so that tape creaseappears once at the flange, and then return the tiltscrew so that the crease disappears.

(2) If there is tape creaseTurn counterclockwise the tilt screw so that thetape crease disappears.

(Reference) If the tilt screw is turned clockwisecrease appears at the lower flange.

Guide roller

Weight of 500g

Cassette Tape

Figure 4-24.

Figure 4-25.

Tape

0.3mm

A/C head

AdjustmentAdjust the height screwvisually so that the control head isvisible 0.3mm below the bottom of the tape.

1. Set the cassette tape in the unit.2. Press the PLAY button to put the unit in the playback

mode.3. Roughly adjust the height of the A/C head by turning the

height screw until the tape is in the position shownbelow.

4-16 A/C HEAD HEIGHT ROUGH ADJUSTMENT

Setting

5 0 0 g


Mechanism chassis

Cassette tape

Height screw

TiH screw

Azimuth screw


23/7823

VC-A560U(A)/A560U/VC-H960U/H960U(B)/

Notes:1. Previously set the tracking control in the center position,

and adjust the ATR signal waveform to maximum with Xvalue adjustment nut. Thereby the tape run rough ad-

justment is facilitated.2. Especially the outlet side ATR signal waveform must

have higher flatness.

2. Adjustment of A/C head height and azimuth1 Perform the initial setting of A/C head position by the

method stated in "4-15Replacement 3".2 Connect the oscilloscope to the audio output termi-

nal.3 Using the alignment tape in which 1 kHz linear audio

signal has been recorded, adjust the height screw soas to get max audio output.

4 Using the alignment tape in which 7 kHz linear audiosignal has been recorded, adjust the azimuth screwso as to get max audio output.

5 The adjustment of3and4twice or three timesrepeat, and finally adjust4.

Figure 4-27.

For X value adjustmentAdjust the X value, turning the gear-type screwdriver.

Figure 4-28.

3. Tape run adjustment1 Connect the oscilloscope to PB ATR signal output

test point, set oscilloscope sync to EXT, trigger-inputthe PB CHROMA signal (head switching pulse).

2 Rough adjustment of X value

Tentatively fix A/C head arm screws1 by the methoddescribed in 4-15"Replacement 3".Playback the alignment tape (VROATSV) andshortcircuit between TP801 and TP802. As a resultthe auto-tracking is automatically cancelled, so thatthe X value adjustment mode is set.Move the A/C head with the X value adjustment geardriver (JiGDRiVER-6) by the method shown in Fig-ure 4-33, and adjust the A/C head so as to get themaximum ATR signal waveform. (Note: When the A/C head is adjusted, adjust so that the maximum ATRsignal waveform is obtained nearest the position ofinitial setting made in 4-15.)


24/7824


3 Next, press the tracking button (+), () and changethe ATR signal waveform from max to min and frommin to max. At this time adjust the height of supplyand take-up side guide roller with the adjustmentdriver (JiGDRiVERH-4) so that the ATR signal wave-form changes nearly parallel.

4 If the tape is lifted or sunk from the helical leadsurface, the PB ATR signal waveform appears asshown in Figure 4-30.

5 Press the tracking button (+), () and make sure thatthe ATR signal waveform changes nearly parallel.

6 Finally, check tape crease near the reverse guide. Iftape crease is found, adjust tilt screw 45 counterclockwise. Small tape crcase will appear at retainguide after this adjustment finished.

3 Move the A/C head with the X value adjustment geardriver by the method shown in Figure 4-33, andadjust the A/C head so as to get the maximum ATRsignal waveform. (Note: At this time adjust so as toget the maximum ATR signal waveform nearest the

A/C head position which has been set in case of Xvalue rough adjustment as stated in 4-17, 3-2.)

4 Adjust the playback switching point (Refer to theelectric adjustment method.)

5 Playback the self-picture-recorded tape, and checkthe flatness of ATR signal waveform and sound.

Notes:

When the A/C head X value adjustment is performed, besure to perform at first X value rough adjustment (refer to 4-17, 3-2).

PB ATRSignal

Head switching pulse

Figure 4-29.4. A/C head X value adjustment1 Fix A/C head arm screws1by the method described

in 4-15"Replacement 3".2 Playback the alignment tape (VROATSV), and

shortcircuit between TP801 and TP802. As a resultthe auto-tracking is automatically cancelled, so thatthe X value adjustment mode is set.

Take-up side Supply side Take-up side

Adjustment

Supply side

Supply side guide rollerrotated in clockwisedirection (lowers guideroller) to flattenATR signal.

Take-up side guide rollerrotated in clockwisedirection (lowers guideroller) to flattenATR signal.

Supply side guide rollerrotated in counterclock-wise direction (raisesguide roller) to make thetape float above the helical

lead. The supplyside guide roller is thenrotated in the clockwisedirection to flatten theATR signal.

Take-up side guide rollerrotated in counterclock-wise direction (raisesguide roller) to make thetape float above the

helical lead. The take-upside guide roller is thenrotated in the clockwisedirection to flatten theATR signal.

Figure 4-30.

When the tape is below the helical lead.When the tape is above the helical lead.

Figure 4-31.

1


25/7825

VC-A560U(A)/A560U/VC-H960U/H960U(B)/

4-19 REPLACEMENT OF DRUM D.D. MOT1. Set the ejection mode.2. Withdraw the main power plug from the socket.

Removal (Perform in numerical order.)1. Disconnect the FFC cable1.2. Unscrew the D.D. stator assembly fixing screws23. Take out the D.D. stator assembly3.4. Unscrew the D.D. rotor assembly fixing screws4

5. Take out the D.D. rotor assembly5.

Notes:1. In removing the D.D. stator assembly, part of the

earth spring pops out of the pre-load collar.Be careful not to lose it.

2. Install, so that the D.D. rotor ass'y and upper drum mounting direction check holes align.(Align the upper drum dent with the rotor hole.)

3. Be careful not to damage the upper drum or the vhead.

4. Protect the hole elements from shock due to contacD.D. stator or D.D. rotor ass'y.

5. After installation adjust the playback switching poiadjustment of servo circuit.

4-18 REPLACEMENT OF THE CAPSTAN D.D.(DIRECT DRIVE) MOTOR

Remove the mechanism from the main PWB (refer to 2-2item 1 When removing the mechanism from the mainPWB ).

Removal (Follow the order of indicated numbers.)

1. Remove the reel belt1.2. Remove the slow brake lever2.3. Remove the three screws3.

Reassembly1. Taking care so that the capstan shaft does not contact

the mechanism chassis, set its position on the mecha-nism chassis, and then install with the three screws.

2. Install the reel belt.

Notes:1. After installing the capstan D.D. motor, be sure to rotate

the capstan D.D. motor and check the movement.2. Set the tape, and check for the tape crease near the

reverse guide in the playback mode. Adjust the A/Chead and azimuth as stated in 4-17 item 2.

Figure 4-33.

Figure 4-32.

Capstan D.D.motor

Capstan D.D. motorcontrol PWB

3

Reel belt12

2 1

4

5

4

D.D. rotor ass'y

D.D.stator ass'y

Upper drum

FFC


26/7826


4-21 ASSEMBLING OF PHASE MATCHINGMECHANISM COMPONENTS

Assemble the phase matching mechanism compo-

nents in the following order.1. Assemble the reverse guide lever and pinch drive cam.2. Mounting the shifter (on the back of the mechanism

chassis).3. Mounting the master cam (on the back of the mecha-

nism chassis).4. Assemble the loading motor parts.

PINCH DRIVE CAM AND REVERSE GUIDELEVER ASSEMBLING METHOD.

(Place the following parts in position in numerical order.)

(1)Pinch drive cam(2)Reverse guide spring2(3)Reverse guide lever assy3(4)Open guide

4-20 REPLACING THE UPPER AND LOWERDRUM ASSEMBLY

Replacement (Perform in the numerical order)1Remove the motor as stated in 4-19D.D. motor replace-

ment.2Remove the drum earth brush assy2.3Remove the upper and lower drum assembly from main

chassis1. 4. Remove the drum FFC holder3.

[Cares when replacing the drum]

1. Be careful so that the drum earth brush is not lost.2. Do not touch directly the drum surface.3. Fit gently the screwdriver to the screws.4. Since the drum assembly is an extremely precise as-

sembly, it must be handled with utmost care.5. Make sure that the drum surface is free from dust, dirt

and foreign substances.6. After replacing the drum be sure to perform the tape

running adjustment.

After that, perform also the electrical adjustment. Playback switching point adjustment X-position adjustment and check Standard and x-3 slow tracking adjustment

7. After replacing the drum clean the drum.

Figure 4-34.

Figure 4-35.

2

1

3

Lower dorum bottom side

4

2

3

1

Dot B

Dot A

Insert it into thegroove of the shaft

Don't run upon the spring


27/7827

VC-A560U(A)/A560U/VC-H960U/H960U(B)/

Figure 4-37.

4-22 INSTALLING THE SHIFTER

Figure 4-36.

1. Make sure that the loading arm T and S are at the PMatching point as shown below .

2. Fix the shifter position setting part to the roading aposition setting part as shown in figure .

3. Make sure tension arm not run on the shifter as sin figure .

a

b

c

Loading arm (T)

Shifter

Insert point

Loading arm (T)Loading arm (S)

Phase matting

*Not run on the

sifter.

Sifter

Tension arm

Drum

Limiter

pully

Capstan D.D.motor

(Bottom side of mechanism chassis)


28/7828


4-23 INSTALLING THE MASTER CAM (ATREAR SIDE OF MECHANISM CHASSIS)

1. Make sure beforehand that the shifter is at initial posi-tion.

2. Place the master cam in the position as shown below.

Note:See the figure below for the phase matching between themaster cam synchro gear and pinch drive cam.3. Finally fix with the E ring.

4-24 REPLACEMENT OF LOADING MOTOR Removal

ReplacementRemove the loading motor, and install the replacementloading motor as shown below.

Figure 4-40.

Figure 4-38-2.

The loading motor pressing-in must be less than 14.7 N(1,500 gf).Adjust the distance between motor and pulley to 6.95 mm.

Figure 4-38-1.

Figure 4-39.

+0. 20.15

E-ring

Line of synchro gear.

Phasematching

Phasematching

Hole of Pinchdrive cam.

Synchro gear Master cam

6.95 mm

A part

Worm gear+0-0.15

Loadingmotor

To press the motor in, firstreceive it by portion A.

Apply grease

Worm gear

Apply grease

Apply grease

Apply grease

L-M-Block.

Worm wheel gear.

Leading connect gear.

*Apply grease to

the tip as well.

Loading

motor.

Wire

+ : Red

- : White

Red

Insert


29/7829

VC-A560U(A)/A560U/VC-H960U/H960U(B)/

2. Frame R, Frame L, Drive Arm R, Drive Arm L, Upper

Plate.

4-25 ASSEMBLY OF CASSETTE HOUSING1. Proof lever Proof lever spring and Holder R

Figure 4-41.

MSPRD0215AJFJ

*Proof lever spring fixing direction designated.

LANGF9661AJFW

Top surface should be free from scratches or soil.


30/7830


5. ELECTRICAL ADJUSTMENT

Notes: Before the adjustment:

Electrical adjustments discussed here are often required after replacement of electronic components and mechanicalparts such as video heads.Check that the mechanism and all electric components are in good working condition prior to the adjustments, otherwiseadjustments cannot be completed.

Instruments required: Color TV monitor Dual-trace oscilloscope Audio signal generator AC milli-voltmeter Blank video cassette tape Alignment tape (VROEFZHS) Screwdriver for adjustment Color bar generator RF signal generator

TP201~204

Figure 5-1.


31/7831

VC-A560U(A)/A560U/VC-H960U/H960U(B)/

SERVO CIRCUIT ADJUSTMENT

5-1 ADJUSTMENT OF HEAD SWITCHINGPOINT

Measuring Color TV monitorinstrument

Mode Playback still

Cassette Self-recorded tape (SP mode)

(See Note below 2)

Control Tracking control buttons(+) or (

Specification No vertical jitter of picture

Measuring Color TV monitorinstrument

Mode Playback

Cassette Self-recorded tape (EP mode)(See Note below)

Control Tracking control buttons(+) or (

Specification No Poor picture and Hi-Fi sound

5-2 ADJUSTMENT OF FV (False VertSync) OF STILL PICTURE

Measuring Dual-trace oscilloscopeinstrument

Mode Playback

Cassette Alignment tape (VROEFZHS)

Test point VIDEO OUT jack to CH2TP202 (Sig.)~TP203 (GND) to CH1

Control Call up the test mode (short circuitbetween TP801 and TP802 on theoperation PWB). Use the tracking/channel select (') and (") buttonsof the set.

Specification 6.0 0.5H (lines)

1. Connect a dual-trace oscilloscope to the VIDEO OUTjack and TP202 (Sig.) and TP203 (GND).(Trigger the oscilloscope with the head switching pulseon TP202.)

2. Playback the alignment tape, and then short circuitbetween TP801 and TP802 on the operation PWB to callthe test mode.

3. Press the PLAY button, and the play LED starts blinkingand the automatic adjustment function gets started.

4. Wait until the play LED stays on to indicate that theadjustment is complete.

5. Watch the oscilloscope screen and make sure that theleading edge of the head switching pulse is 6.0H (lines)

ahead of the vertical sync as shown in Figure 5-2.6. If the setting is out of this range, readjust the data usingthe channel select (') and (") buttons of the set or theremote controller.

7. Finally press the STOP button to quit the test mode.

Figure 5-2.

6.0 0.5H (lines)CH-1HEAD

SWITCHINGPULSE

CH-2VIDEO OUT

CH-1: 1V/dev 50sec/devCH-2: 1V/dev 50sec/dev

V-sync.

1. Play a cassette which was recorded by the unit imode.

2. Press the PAUSE/STILL button to freeze the pictu3. Look at the monitor screen and adjust (+) or () TRA

ING buttons so that the vertical jitter of the pictuminimized.

4. Play and freeze the self-recorded tape in EP modemake sure vertical jitter of the picture is not noticea

Note:1 The FV goes back to the its initial state when the u

put into the system controller reset mode due to pofailure, etc.In this case, preset the FV once again.

2 Self-recorded tape is a cassette whose programrecorded by the unit being adjusted.

1. Play a cassette which was recorded by the unit imode.

2. Short circuit between TP801 and TP803 on the PWB, and press both CH button (+) and CH button (same time.

3. Press the tracking buttons (+) or () 20 times eac

bring the tracking off center. Make sure that:1) There is nothing unusual on the playback scree2) There is nothing unusual in the Hi-Fi sound (for th

Fi models only).4. Cancel the short circuit.Note:Self-recorded tape is a cassette whose program wacorded by the unit being adjusted.

5-3 CHECKING OF OFF TRACK


32/7832


1 01 1

1 1

0

1 1

1 1

1 0

1 0

0 0

1 0

1 00 0

1 0

0 0

0 0

1 0

0 0

1 0

1 0

0 0

1 0

Ssensor

Open

Close

Modedetectioninside

sens

orA

1 1 1 0 0 0 0 0 0

Modedetectionoutside

sensorB

0 1 1 1 1 0 1 1 0

CS/EJ

ULD

PU1

PU2

VSR

PB

SLOW

FF

STOP

CamgraphE

25

20

15

10 5 0

60

120

180

240

3

00

380

Gmechanicaltiming

Modecheck

Cammark


(D709SWB

)

Modedetectioninside

(D708SWA

)

0

19.8

12

81

179

233

200

265

282

316

334

10.3

5412.8

12

CA/END

CS/EJ

UL

PU1

PU2

VSR

PB

SLOW

FF

STOP


Modedetectioninside

Ssensor

EJ

UL

PU

PU2

VSR

PB

SLW

FF

STP

0 1 1

0 1 1

0 0 0

0 0 1

0 01or0

Loadingm

otorturnsinreverse

directionandmastercam

counterclockwise.

CASSETTEINSERTION

STO

P

Cassette

inserting

Full-

loading

YES

YES

YES

NO

NO

NO

Unloading

Loadingm

otorstartsinnormal

directionandmastercamcounter

clockwise

.

Doesme

chanismpositionsw.

comeoff

within2.5sec.?

Arestart/endsensorsatlowlevel

beforeca

ssetteinsertion?

Insertcassette.

Doubleactionrackslides.

Drummotorstarts.

Tapeloading.

Pinchro

llercomesintocontact.

Camsw

itchisatPBposition.

Loadingmotorstop.

Isdrum

FGpulseoutputted?

End

End

Cassette

isejectedandloading

motorsto

ps.

Sta

rtsensorclose.

(Cassetteisjudged

caughthalfway.)

(CassetteLEDo

rsomeotherpart

isjudgeddefective.)

6.MECHANISMOPERA

TIONFLOWCHARTANDTROUBLESHOOTING

GUIDE

MECHANISMOPERATIONF

LOWCHART

*Thisflowchartdescribestheo

utlineofthemechanismsoperatio

n,

butdoesnotgiveitsdetails.


33/7833

VC-A560U(A)/A560U/VC-H960U/H960U(B)/

STOP

REC/PLAY

PLAY

STILL

PLAY

VSR

VSR

PLAY

Capstanmotorturns

counterclockwise.

Istake-upreelsensorsignal

outputted?

End

PressREC/PLAYkey.

Pictureappears.

Unloading

Setcapstanmotortosearch

speed.

End

PressFFkey.

PLAY

VSF

REC/PLAY

STOP

Capstanmotorturnsin

reversedirection.

Loadingmotorturnsin

counterclockwisedirection

andmastercamclockwise.

Slowbrakecomesinto

contactwithcapstanmoto

r.

Slowbrake

pressing

CamswitchisatSTILL

position.

End

Capstanmotorstops.

PressSTOPkey.

Loadingmotorstops.

End

Stopcapstanmotor.

NO

YES

PressSTILLkey.

Pinch

roller

releasing

Idler

swinging

Pinch

roller

pressing

Loadingmotorturns

clockwiseand

master

camcounterclockwise.

Turncapstanmotorin

reversedirection.

Turnloadingm

otor

counterclockw

ise.

Camswitchis

atVSR

position.

Setcapstanm

otortosearch

speed.

Istake-upreelsensorsignal

outputted?

PressR

EWkey.

Releasep

inchroller.

CamswitchisatPU2position.

CamswitchisatPU1position.

Stopload

ingmotor.

Presspinchroller.

Loadingmotorturnsclockwise.

Releasethes

upplyauxiliary

brake.

Stopload

ingmotor.

End

U l

d i

Ca

mswitchisatPBposition.

End

PressPLAYKey.

Lo

adingmotorturnscounter-

clo

ckwiseandmastercam

clo

ckwise.

Ca

pstanmotorturns

co

unterclockwise.PBspeed.

NO

YES


34/7834


STOP

FF/REW

STOP

CASSETTEEJECT

FF/REW

STOP

NO

NO

FF/REW

operation

Brake

function

Turncapstanmotorin

normalorreversedirection,

aftertheremainingtapehas

beendetected.

Loadingmotorturnscounter-

clockwise.

CamswitchisatStop

position.

End

PressSTOPkey.

PressFF/REW

key.

Stopcapstanmotor.

Loadingmotorstops.

End

Loading

motorturnsinclockwiseandmastercam

counterclockwise.

4supply

reelpulses

outputte

d?

Doesthetake-up

reelpuls

eoutput

twoedges?

Capstan

motorturns

clockwis

e.

Loading

motorturns

clockwis

e.

Camsw

itchisat

Ejectpo

sition.

Loading

motor

stops.

Capstan

motor

stops.

PressEJECTkey.

Tape

unloading

Cassette

eject

End

Capstanmotorturns

clockwise.

Capstanmotorturns

counterclockwisein

about

2seconds.

Stoploadingmotor.

Capstanmotorturnsinreversedirection.

CamswitchisatULposition.

YES

YES


35/7835

VC-A560U(A)/A560U/VC-H960U/H960U(B)/

MECHANISMTROUBLESHOOTING

1.FF/REWF

AILURE(NOTAPEWINDING)

PressFFkey.

NO

NO

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

YES

YES

Ismastercamat

FFposition?

Doesloading

motoroperate?

Modeschangin

g

smoothlythrough

camswitch?

Loadingmotor

controlsystem

introuble.

AreVco12Van

d

Vcc5Vapplied

?

Replacethe

capstanmotor.

Replacetheidler

assy.

Replacethereel

sensor.

Isvoltageapplied

toloadingmotor?

Loadingmotoris

damaged.

Replace

it.

Voltagesupply

systemintrouble.

Modesensor

systemintrouble

ormastercam

malpositioned.

Voltagesupply

system

introuble.

Doescapstan

motorturninFF(or

REW)direction?

Areidlerwheel

assyandreeldisk

inmesh?

Isthepulse

outputtedfromreel

sensor?

Thecassettetape

ispresumably

damaged.

2.REC/PLAYFAILURE

(MODERELEASE)

NO

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

YES

YES

Isthemastercam

atPBposition?

Doesloading

motoroperate?

Modeschanging

smoothlythrough

camswitch?

Loadingmotor

controlsystem

introuble.

AreVco12Vand

Vcc5Vapplied?

Replacethe

capstanmotor.

Replacetheidler

assy.

Replacethereel

sensor.

Isvoltageapplie

d

toloadingmotor?

Loadingmotoris

damaged.

Repla

ce

it. V

oltagesupply

systemintrouble.

Voltagesupply

systemintrouble.

Doescapstan

motorturn?

Areidlerwheel

ass'yandreeldisk

inmesh?

Isthepulse

outputtedfromreel

sensor?

CheckmainPWB.


36/7836


Replaceloadingmotorblo

ck.

3.WINDINGF

AILUREATVSR

4.UNUSUALSOUNDINEACHMODE

IsPlayback

functionnormal?

Mastercam

shiftingtoVSR

position?

Goto2.

REC/

PLAYFAILURE

routine.

Replaceidler

gearassy.

Replacelimiter

pulleyassy.

Replacereel

sensor.

Goto2.

REC/

PLAYFAILURE

routine.

Areidlerwheel

assyandsupply

reeldiskinmesh?

Issupplyreeldisk

windingtorque

normal?

Ispulseoutputted

fromreelsensor?

CheckmainPWB.

YES

YES

YES

YES

YES

N

O

N

O

N

O

N

O

N

O

YES

YES

NO

NO

YES

PressR

EW

key.

4-i)Unusualsoundincasse

tte

insertionandejectionm

ode

Isunusalsoundhearddurin

g

cassettecontrolrunning?

Unusualsoundheardwithp

inch

rollerlevergoingupordown?

Isunusualsoundheardduring

loading/unloading?

Checkpinchrollerdrivecam,pinchroller

driveleverandreverseg

uidefortheiractions.

Replacedamagedonew

ithnewone.

Replacecassette

controlassy.


37/7837

VC-A560U(A)/A560U/VC-H960U/H960U(B)/

YES

YES

NO

NO

NO

NO

YES

YES

Replacecapstanmo

tor.

4-ii)UnusualsoundinFF/REWmode

Isreeldiskheightasspecified?

Thrustgapfoundatreeldisk?

Drivesystemoutofcontactwithany

partonmainPWB?

Turncapstanmotorbyhand.

Unusualsoundheard?

Checkdrivesystemsgearsfor

damage.Replacedamagedgear

withnewone.

Reeldisk

Limiterpulleyassy

Idlerwheelassy

Checkreeldiskandmaincha

ssis.

Andreplacedefectiveparts.

Adjustreeldiskheig

ht.

RearrangethepartsonmainPWB.


38/7838


7.TROUBLESHOOTING

FL

OWC

HARTNO.1

Nopower

The

fuse

blowsou

tevenw

hen

itis

rep

lace

dw

ithnewone.

SeeFLOWC

HARTNO.2

.

YES

YES

YES

YES

NO

NO

NO

NO

NO

Isthe

fusegoo

d?

Isthenorma

ls

tateres

tore

dw

hen

onceunp

lugge

dpowercord

is

plugge

daga

ina

ftersevera

l

secon

ds

?

Chec

kfor

lea

kors

hort-circu

iting

ofprimaryc

ircu

itpart.

(L901

,D901~

904

,T901,C

906

,

R904

,Q901~

902

,e

tc.)

Are

AT5Vvo

ltage

linenorma

l?

Are

AT44V

,AT27V

,PC12V

,

norma

l?

Chec

keac

hrec

tifierc

ircui

tsan

d

short-c

ircu

ito

fsecon

daryc

ircu

it.

Is"H"leve

lapp

lieda

tp

in(96)o

f

IC701?

Chec

kthepower

failure

circu

it.

(Q705)

FLOWC

HARTNO.3

Whentheoutputvoltagefluctuates.

Checkwhetherthesecondaryside

photocouplercircuitoperates

normally.

Checkthecircuitandreplac

eparts.

(IC901,

IC903,etc.)

NO

YES

Checkwhethertheprimaryside

photocoupleroutputcontrol

functionsnormally.

Checkthecircuitandreplac

eparts.

(IC901,

IC903,

Q902,

T901,etc.)

NO

YES

ReplaceIC901.

FLOWC

HARTNO.2

Fuseblownout.

Case(1)

Case(2)

Checkforleakorshort-circuitingof

primarycircuitpart.

(L901,D901~904,T901,C906,

R904,Q901~902,etc.)

Checkforshort-circuitingo

f

rectifyingdiodeandcircuitineach

rectifyingcircuitofseconda

rycircuit.

(D9334,D931~933)

FLOWC

HARTNO.4

Whenbuzzisheardfromthevicinityofpowercircuit.

Checkforshort-circuitingofcircuitandrectifyingdiodeofeachr

ectifyingcircuitofsecondary

circuitandchec

kforfailureofshuntregulatorcircuit.

(D9334,D

931~933,

IC903,

C935,

C963)


39/7839

VC-A560U(A)/A560U/VC-H960U/H960U(B)/

FLOWC

HARTNO.6

Nooperationispossible

fromtheinfraredremotecontrol.

Opera

tion

isposs

iblefrom

the

VCR

,

bu

tnoopera

tion

isposs

iblefrom

the

infrare

dremo

tecon

tro

l.

Isthesupp

lyvo

ltageo

f5Vfee

dto

pin(3)term

ina

lo

fremo

tecon

tro

l

rece

iver?

Chec

kAT5Vlines.

Is"L"pu

lsesen

tou

tp

in(1)term

ina

lo

f

rece

iverw

hen

the

infrare

dremo

te

con

tro

lisac

tiva

ted?

Rep

lace

theremo

tecon

tro

lreceiver

orrep

lace

theremo

tecon

tro

l

transm

itter

ifnecessary.

Isinpu

tte

d"L"pu

lse

top

in(4)o

f

IC701?

Chec

kline

be

tweena

tremo

te

con

tro

lrece

iver

thru

top

in(4)of

IC701

.

YES

YES

NO

NO

NO

YES

Rep

lace

IC701

.

YES

FLOWC

HARTNO.7

Acassette

tapeisnottakein.

YES

YES

YES

NO

NO

NO

Checkstartsensorshutter.

Checklinestartsensorandallthe

wayupthrutopin(67)ofIC701.

Checklinepin(72)ofIC701andall

thewayupthrutopin(10)ofP701.

Replaceloadingmotor.

Doespin(10)ofP701gofrom2.5

V

to4.2

Vwhenthecassettetapeis

inserted.

Doespin(67)ofIC701changefrom

"H"to"L"levelwhenthecassette

tapeisinserted?

Arestartsensorshuttergotoopen

whenthecassettetapeisinserted?

NO

NO

NO

FLOWC

HARTNO.8

Acassettetapeistakenin,butejectedatonce.

Does

thes

tartsensorpu

lsea

t

pin(67)o

fIC701c

hange

from

"L"to

"H"leve

lw

hen

thecasse

tte

tape

is

loa

de

d?

Chec

ks

tartsensoran

da

lltheway

up

thru

toIC7

01

.

Does

theen

dsensorpulsea

tp

in(66)

ofIC701c

hange

from

"L"to"H"leve

l

when

thecasse

tte

tapeis

loa

de

d?

Chec

ken

dse

nsoran

da

lltheway

up

thru

toIC7

01

.

Does

themas

tercammo

des

hifter

opera

tenorma

llyw

henth

ecasse

tte

tape

isloa

de

d?

Chec

kcamsw

itc

han

da

lltheway

up

thru

toIC7

01

.

Rep

lace

IC701

.

YES

YES

YES


40/7840


FLOWCHARTNO.9

Thecassette

tapefailstoeject.

Does

thecaps

tanmo

tors

tartw

hen

the

EJECTbu

tton

ispresse

d?

SeeFLOWC

HARTNO.11.

Does

the

take-upree

ldiskturnw

hen

thecaps

tanmo

tor

isrunn

ing

?

Chec

kree

ldiskan

dree

ldriveun

it.

Arepu

lsesapp

lieda

tp

in(2)o

fIC701

when

the

take-upree

ldiskisturn

ing

?

Chec

ktake-upree

lsensoran

dal

lthe

wayup

thru

toIC701

.

Doesp

in(10)o

fP701go

from

2.5

V

to0

.8Vw

henvee

lpu

les

has

beer

inpu

t.

Chec

kp

in(72)o

fIC701

.

Does

the

loa

dingmo

torrun

?

Rep

lace

loa

dingmo

tor.

Rep

lacecasse

ttecam,

gear,e

tc.

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

YES

YES

YES

NO

NO

NO

FLOWC

HARTNO.10

Nopoweristurnedon.

Doespowercon

tro

l(H)s

igna

la

t

pin(76)o

fIC701c

hange

from

"L"to

"H"leve

l?

Chec

kIC701

.

Does

the

baseo

fQ951c

hange

from

abou

t5

.0Vto4

.5V?

Chec

kIC701an

da

llthewayup

thru

toQ951

.

Is5Vsen

tou

to

ftheem

ittero

f

Q951?

Chec

kQ951

an

dthe

AT5Vline.

Chec

kperip

hera

lc

ircu

its

forpoor

so

ldering.

FLOWC

HARTNO.11

Thecapstanmotorfailstorun.

Isthevo

ltagemore

than

abou

t2

.6V

DCg

ivenou

to

fp

in(24)o

fIC701

.

Chec

kIC701

.

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

Isthesupp

lyvo

ltageof

5Vfee

dto

pin(3)o

fP701

.

Chec

kPC5Vline.

Isthevo

ltagemore

than

2.6

VDC

sen

tinp

in(9)o

fP701.

Chec

kbe

tweenp

in(9)o

fP701an

d

allthewayup

thru

top

in(24)o

f

IC701

.

Isthevo

ltagea

tp

in(5)o

fP701

3.5

V?

Chec

kbe

twee

nthep

in(71)o

fIC701

an

da

llthewayup

thru

top

in(5)o

f

P701

.

Isthesupp

lyvo

ltageof

12Vfee

dto

pin(2)o

fP701

.

Chec

kmo

tor-V

CClinean

dmo

tor

vo

ltagese

lec

torc

ircu

it.

Rep

lace

caps

tanmo

tor.


41/7841

VC-A560U(A)/A560U/VC-H960U/H960U(B)/

FLOWC

HARTNO.12

Thedrum

motorfailstorun.

Isthevoltagemorethanabout2.6

V

DCgivenoutofpin(25)ofIC701.

CheckIC701.

NO

NO

NO

YES

YES

YES

Checkbetweenpin(25)ofIC701

andallthewayuptopin(12)of

P701.

Isthevoltagemorethanabout2.6

V

appliedatpin(2)ofP701.

NO

YES

CheckPC5Vline.

Isthesupplyvoltageof5Vfeedto

pin(3)ofP701.

Isthesupplyvoltageof12Vfeedto

pin(8)ofP701.

Checkorreplacedrummotor.

CheckAT12Vline.

NO

YE

S

YE

S

YES

NO

NO

FLOWC

HARTNO.14

Noheadswitchingpulse. S

eeFLO

WC

HARTNO.12,13

Isthe

drummo

tor

rotating

?

Isthe

drum

PG/FGsig

na

lpresen

t

onp

in(47)o

fIC701

.

Cou

ldbel

ines

be

tween

P701

an

dIC701

.

Chec

kperip

hera

lcirc

uito

fP701

Isthe

drum

PG/FGsig

na

lpresen

t

onp

in(11)o

fP701

.

R

ep

lace

IC701

.

Chec

korrep

lace

drummo

tor.

Chec

kline

be

tweenp

in(11)o

fP7

01

an

da

llthewayup

thru

to

pin(47)o

fIC701

.

Isdrum

PGs

igna

lg

ivenou

to

f

pin(47)o

fIC701?

IsV-H.S

W.P

pu

lseg

ivenou

to

f

pin(18)o

fIC701?

Chec

kIC701

.

Rep

lace

IC701

.

YES

YES

YES

FLOWCHARTNO.13

Thedrummotorrunsonlyforafewseconds.

Isdrum

PGs

igna

lg

ivenou

to

f

pin(11)o

fP701

.

Chec

kp

in(12)o

fP701

.

Rep

lace

IC706

.

YES

NO

NO

NO

NO


42/7842


FLOWC

HARTNO.15

Drumservodoesnotfunction.

Chec

kperip

hera

lc

ircu

ito

fX701

.

Isthere

14

.318MHzosc

illa

tiona

t

pins

(37)an

d(38)o

fIC701?

NO

InPBmode

YES

InRECmode

Isthere

drum

PG/FGs

igna

la

t

pin(47).

Isthe

V-S

YNCs

igna

l(re

ference

)a

t

pin(41)o

fIC701?

YES

NO

NO

Chec

kperip

hera

lc

ircu

ito

fp

in(41)o

f

IC701

,C715

,C7716an

dR708

.

Chec

kdrum

PG/FGs

igna

lline.

Isthe

hea

dsw

itc

hingpu

lsea

tp

in(18)

ofIC701presen

t?

NO

SeeFLOWC

HARTNO.14

.

YES

YES

Isthe

drum-errora

tp

in(29)o

fIC701

presen

t?

NO

Rep

lace

IC701

.

YES

YES

Isthe

drumcon

tro

lvo

ltageapp

lied

top

in(2)o

fIC701

.

YES

Isp

in(25)o

fIC701inhigh

impe

dance

?

NO

YES

NO

Chec

klines

be

tweenp

in(29)o

f

IC701an

dp

in(12)o

fP701

.

Does

the

IC706opera

tenorma

lly?

Rep

lace

IC701

.

Rep

lace

drummo

tor.


43/7843

VC-A560U(A)/A560U/VC-H960U/H960U(B)/

1

2

FLOWC

HARTNO.16

Capstanservodoesnotfunction.

OnlyPBmodeinop

erative

YES

OnlyRECmodeinoperative

YES

YES

NO

YES

NO

NO

NO

NO

NO

Checkperipheral

circuitofpin(41)of

IC701,

C715,

C7716andR708.

Isthere14.3

18MHz

oscillationatpin

(32)and(33)of

IC701?

Checkperipheral

circuitofX701.

YES

YES

YES

Doespin(24)of

IC701operate

normally?

Check"1"

Check"2"

Checkcapstan

motorunitand/or

replace.

IsthereCAP-

ERRORatpin(28)

ofIC701?

ReplaceIC701.

ReplaceA/Chead.

YES

YES

YES

NO

NO

NO

IsthereCAP-

ERRORsignalat

pin(28)ofIC701?

NO

NO

NO

ReplaceIC701.

DoesPBCTL

signalappearat

pin(58)ofIC701?

ReplaceIC701.

IsthereRECCTL

signaloutputat

pin(57)and(56)

ofIC701?

DoesPBCTL

signalappearat

pin(58)ofIC701?

DoesA/Chead

operatenormally?

Adjusttheheight

oftheA/Chead.

Doesthecapstan

FGsignalappear

atpin(49)ofIC-

701?

Checkthecapstan

FGsignallinebet-

weenpin(1)of

P701andpin(49)

ofIC701.

Checkperipheral

circuitofAC

connector.

IstheV-SYNC

signal(reference)at

pin(41)ofIC701?

AreRECand/orPB

modeinoperative?

YES


44/7844


PictureE-Edoesnotappear.

Ispicturesignalinputintopins(30)and(3

1)ofIC201?

YES

YES

YES

YE

S

YES

YES

NO

NO

NO

NO

NO

NO

NO

NO

1Extern

alinputmode

Check

thelinebetweentherearvideoinputterminal

andpin(30)ofIC201.

2U

/Vtunermode

Check

thelinebetweenthepin(25)ofU/Vtunera

nd

pin(31

)ofIC201.

Ispicturesignaloutputtothepin(52)ofIC201?

Ispicturesignalinputintothepin(40)ofIC701?

Ispicturesignaloutputtothepin(38)o

fIC701?

Checkthelinebetweenpin

(52)ofIC201

andpin(40)ofIC701.

Che

ckthelinebetweenpins(63)and(62)of

IC201andpins(64)and(65)ofIC701.

Ispicturesignaloutputtotheemitterofvideooutput

buffer(Q251)?

1L

ineo

utput:CheckQ251peripheryandoutputterminalperiphery.

2R

Fou

tput:CheckQ251peripheryandtunerpin(6)periphery.

Is5Vappliedtothepins(12),(61)and(90)ofIC201?

Is5Vappliedtothepin(42)ofIC701?

CheckthePC5Vline.

ChecktheAT5Vline.

Is

serialdataclocksignalappliedtothe

pins(63)and(62)ofIC201?

CheckQ251periphery.

FLOWC

HARTNO.17


45/7845

VC-A560U(A)/A560U/VC-H960U/H960U(B)/

Picture(luminance)record

isimpossible(E-Emodeispossible).

Althoughpicturerecordispossible,colordoesnotappear(E-Emodeispossible).

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

Isluminancesignal(approx.

0.5

Vp-p)inputtothepin(19)ofIC201?


0.3



0.5



0.5

Vp-p)inputtothepin(39)of

IC201?


0.5


YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

Istheluminancesignal(approx.

0.5

Vp-p)inputandoutputtothepins(13)

and(14)ofIC201,respectively?

Checkbetweenthepins(18

)and

(19)ofIC201.

(CheckC206

.)


)and

(42)ofIC201.

(CheckC208

.)

Check

betweenthepins(60)and

(46)of

IC201.

(CheckC512.)

Checkb

etweenthepins(58)and

(35)ofIC201.

(CheckR505,

C512.)


)and

(26)ofIC201.

(CheckC212

.)


)and

(23)ofIC201.

(CheckC210

.)

Isvoltage5VappliedtotheCCD

section

powerterminalpin(36)ofIC201?

IsCCDcontrolvoltageappro

x.

5V

appliednormallytothepin(37)from

thepin(57)ofIC201?Isclocksignal

(approx.

7.1

6MHz/0.5

Vp-p)

for

CCDappliednormallytothe

pin(44)

fromthepin(69)ofIC201?

Checkthepins(13)and(14)o

fIC201

peripheralcircuit.

(R201,

R202,

C203)

SPmode:IsrecordFMsignal(approx.20

mAp-p)outputtothepins(88)and(89)(SP

1)andpins(86)and(87)(SP2)ofIC201?

EPmode:IsrecordFMsignal(approx.20

mAp-p)outputtotheIC201pins(93)and(94)(EP1)andpins(92)and(91)(EP2)ofIC

201?

Checkorreplac

ethecylinder.

IsPRE

/RECVcc5Vappliedtothepin(90)ofIC20

1?

Isvoltage5Vappliedtothechroma

powerterminalpin

(61)ofIC201?

Ischromasignal(approx.

143

mVp-p/Burst)inputintothe

pin(46)ofIC201

?


180

mVp-p/Burst)inputintothe

pin(58)ofIC201

?

Check

theperipheryofpin(61)of

IC201andPC5Vline.

Checkwhetherthepins(71)and

(73)ofIC201oscillate(3.5

8MHz)?


180

mVp-p/Burst)outputtothe

pin(35)

ofIC201?

FLOWC

HARTNO.18

FLOWC

HARTNO.19


46/7846


Playbackpicturedoes

notappear(E-Emodeispossible).

YES

YES

YES

YES

YES

YES

YES

YES

NO

NO

YES

YES

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

IsV-H.SW.P.appliedtothe

pin(81)ofIC201?

Althoughpictureisplayedback,colordoesnotappear(E-Emodeispossible).

Isvoltage5VappliedtotheCCDsectionpowerterminalpin(36)ofIC201?

Iscontrolvoltageapprox.5Vappliednormallytothepin(37)fromthepin(57)ofIC201?IsCCDclocksignal

(approx.7.16

MHz/0.5Vp-p)appliedtothepin(44)fromthepin(69)ofIC201?

Checkbetweenthepins(24)and(23)ofIC201.(CheckC210.)

Isluminancesignal(approx.0.5








IsFMsignal(approx.0.4Vp-p)

inputtothepin(78)ofIC201?


Vp-p)inputtothepin(79)of

IC201?


0.5


Checkbetweenthepin(39)

and

pin(26)ofIC201.(CheckC2

12.)


and


08.)


and


06.)

Checkbetweenthepin(55)and

pin(54)ofIC201.

(CheckC514.)

Checkbetweenthepins(79)and

(78)ofIC201.

Istheluminancesignal(approx.0.25

Vp-p)inputandoutputtothepins(13),

(14)and(16)ofIC201,respectively?

Isvoltage5Vappliedtothechroma

powerterminalpin

(61)ofIC201?

Ischromasignal(appro

sharp_vc-a560u_h960u_h961u_[ET]

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