Transcript
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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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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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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
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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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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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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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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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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
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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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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.
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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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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
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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
Remove the cassette housing control assembly.
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
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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
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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
Remove the cassette housing control assembly.
After short-circuiting between TP803 and TP802
provided at operation PWB, plug in the power cord.
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
Remove the cassette housing control assembly.
After short-circuiting between TP803 and TP802provided at operation PWB, plug in the power cord.
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
Remove the cassette housing control assembly.
After short-circuiting between TP803 and TP802
provided at operation PWB, plug in the power cord.
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
Weight to preventfloat (500g)
(T-120)
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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
Weight to preventfloat (500g)
Cassette torquemeter
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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)
Remove the cassette housing control assembly.
After short-circuiting between TP803 and TP802provided at operation PWB, plug in the power cord.
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.
Remove the cassette housing control assembly.
After short-circuiting between TP803 and TP802provided 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. 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
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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.
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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
Weight to preventfloat (500g)
Mechanism chassis
Cassette tape
Height screw
TiH screw
Azimuth screw
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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.)
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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
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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
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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
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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)
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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
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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.
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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.
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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
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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
Modedetectionoutside
(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
Modedetectionoutside
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.
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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
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VC-A560U(A)/A560U/A560U(B)VC-H960U/H960U(B)/H961U
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
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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.
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VC-A560U(A)/A560U/A560U(B)VC-H960U/H960U(B)/H961U
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.
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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.
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VC-A560U(A)/A560U/A560U(B)VC-H960U/H960U(B)/H961U
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)
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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
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VC-A560U(A)/A560U/A560U(B)VC-H960U/H960U(B)/H961U
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.
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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
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VC-A560U(A)/A560U/A560U(B)VC-H960U/H960U(B)/H961U
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.
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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
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VC-A560U(A)/A560U/A560U(B)VC-H960U/H960U(B)/H961U
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
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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?
Isluminancesignal(approx.
0.3
Vp-p)inputtothepin(42)ofIC201?
Isluminancesignal(approx.
0.5
Vp-p)inputtothepin(26)ofIC201?
Isluminancesignal(approx.
0.5
Vp-p)inputtothepin(39)of
IC201?
Isluminancesignal(approx.
0.5
Vp-p)inputtothepin(23)ofIC201?
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
.)
Checkbetweenthepins(21
)and
(42)ofIC201.
(CheckC208
.)
Check
betweenthepins(60)and
(46)of
IC201.
(CheckC512.)
Checkb
etweenthepins(58)and
(35)ofIC201.
(CheckR505,
C512.)
Checkbetweenthepins(39
)and
(26)ofIC201.
(CheckC212
.)
Checkbetweenthepins(24
)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
?
Ischromasignal(approx.
180
mVp-p/Burst)inputintothe
pin(58)ofIC201
?
Check
theperipheryofpin(61)of
IC201andPC5Vline.
Checkwhetherthepins(71)and
(73)ofIC201oscillate(3.5
8MHz)?
Ischromasignal(approx.
180
mVp-p/Burst)outputtothe
pin(35)
ofIC201?
FLOWC
HARTNO.18
FLOWC
HARTNO.19
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VC-A560U(A)/A560U/A560U(B)VC-H960U/H960U(B)/H961U
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
Vp-p)inputtothepin(23)ofIC201?
Isluminancesignal(approx.0.5
Vp-p)inputtothepin(26)ofIC201?
Isluminancesignal(approx.0.5
Vp-p)inputtothepin(42)ofIC201?
Isluminancesignal(approx.0.5
Vp-p)inputtothepin(19)ofIC201?
IsFMsignal(approx.0.4Vp-p)
inputtothepin(78)ofIC201?
Isluminancesignal(approx.0.4
Vp-p)inputtothepin(79)of
IC201?
Isluminancesignal(approx.
0.5
Vp-p)inputtothepin(39)ofIC201?
Checkbetweenthepin(39)
and
pin(26)ofIC201.(CheckC2
12.)
Checkbetweenthepin(21)
and
pin(42)ofIC201.(CheckC2
08.)
Checkbetweenthepin(18)
and
pin(19)ofIC201.(CheckC2
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
top related