AS FILE NO. SERVICE MANUAL (SUPPLEMENT) Remote Control Color Television DS24425 (U.S.A.) (CANADA) ORIGINAL VERSION Chassis No. 24425-00 NOTE: Match the Chassis No. on the unit’s back cover with the Chassis No. in the Service Manual. If the Original Version Service Manual Chassis No. does not match the unit’s, additional Service Literature is required. You must refer to “Notices” to the Original Service Manual prior to servicing the unit. H2BCA, PRODUCT CODE 111370382 REFERENCE No. SS780053 THIS CHASSIS IS SIMILAR TO MODEL DS24424, CHASSIS NUMBER 24424-00. SERVICE INFORMATION GIVEN IN THIS MANUAL IS ONLY THE DIFFERENCE INFORMATION FROM MODEL DS24424, CHASSIS NUMBER 24424-00. FOR ADDITIONAL SERVICE INFORMATION, REFER TO THE SERVICE MANUAL FOR CHASSIS NUMBER 24424-00 USED IN MODEL DS24424 (SM780092). AS
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Sanyo Plana Chassis 24424-00 24425-00 Manual de Servicio
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ASFILE NO.
SERVICE MANUAL
(SUPPLEMENT)
Remote Control Color
TelevisionDS24425 (U.S.A.)
(CANADA)ORIGINAL VERSION
Chassis No. 24425-00
NOTE: Match the Chassis No. on the unit’s back cover with the Chassis No. in theService Manual.
If the Original Version
Service Manual Chassis
No. does not match the
unit’s, additional ServiceLiterature is required. Youmust refer to “Notices” tothe Original Service Manualprior to servicing the unit.
NOTE: Match the Chassis No. on the unit’s back cover with the Chassis No. in theService Manual.
If the Original VersionService Manual ChassisNo. does not match theunit’s, additional ServiceLiterature is required. Youmust refer to “Notices” to theOriginal Service Manualprior to servicing the unit.
AS
FILE NO.
— 2 —
SAFETY PRECAUTIONS
WARNING: The chassis of this receiver has a floatingground with the potential of one half the AC line voltage inrespect to earth ground. Service should not be attempted byanyone not familiar with the precautions necessary whenworking on this type of equipment. The following precautions must be observed:1. An isolation transformer must be connected in the power
line between the receiver and the AC line before any ser-vice is performed on the receiver.
2. Comply with all caution and safety-related notes provid-ed on the side of the cabinet, inside the cabinet, on thechassis, and the picture tube.
3. When replacing a chassis in the cabinet, always be certainthat all the protective devices are installed properly, suchas control knobs, adjustment covers, shields and barriers.
DO NOT OPERATE THIS TELEVISION RECEIVER WITHOUT THE PROTECTIVE SHIELD IN POSITION ANDPROPERLY SECURED.
4. Before replacing the back cover of the set, thoroughlyinspect the inside of the cabinet to see that no stray partsor tools have been left inside.Before returning any television to the customer, the service technician must perform the following safetychecks to be sure that the unit is completely safe to operate without danger of electrical shock.
ANTENNA COLD CHECK
Remove AC plug from the 120 VAC outlet and place ajumper across the two blades. Connect one lead of an ohm-meter to the jumpered AC plug, and touch the other lead toeach exposed antenna terminal (UHF and VHF antenna ter-minals). The resistance must measure between 1M ohm and5.2M ohm. Any resistance value below or above this rangeindicates an abnormality which requires corrective action.
LEAKAGE CURRENT CHECK
Plug the AC line cord directly into a 120 VAC outlet. (Do notuse an isolation transformer for this check.) Use an AC volt-meter, that has 5000 ohms per volt or more sensitivity.Connect a 1500 ohm 10 watt resistor, paralleled by a 0.15 µF150 VAC capacitor, between a known good earth ground(water pipe, conduit, etc.) and all exposed metal parts of thecabinet (antennas, handle bracket, metal cabinet, screwheads, metal overlays, control shafts, etc.). Measure the ACvoltage across the 1500 ohm resistor. The AC voltageshould not exceed 750 mV. A reading exceeding 750 mVindicates that a dangerous potential exists. The fault mustbe located and corrected. Repeat the above test with thereceiver power plug reversed.
NEVER RETURN A RECEIVER TO THE CUSTOMER WITHOUT TAKING THE NECESSARY CORRECTIVE ACTION.
X-RADIATION PRECAUTION
The primary source of X-RADIATION in solid-state receivers isthe picture tube. The picture tube is specially constructed tolimit X-Ray emission. For continued X-RADIATION protection,the replacement tube must be the same type as the original(including the suffix letter in the part numbers). Excessive highvoltage may produce potentially hazardous X-RADIATION. Toavoid such hazards, the high voltage must be maintained withinspecific limits. Refer to the X-RADIATION WARNING NOTE onthe CHASSIS SCHEMATIC in this service manual for specifichigh voltage limits. If the high voltage exceeds specified limits,check the components specified on the chassis schematicdiagram and take the necessary corrective action. Carefullyfollow the instructions for the +B Voltage Check and the HighVoltage Check to maintain the high voltage within the specifiedlimits.
HIGH VOLTAGE HOLD-DOWN TEST
To prevent X-RADIATION from the picture tube due toexcessive high voltage, a HOLD-DOWN circuit is provided inthe high voltage circuit. Every time the receiver is serviced,the high voltage HOLD-DOWN circuit must be tested forproper operation. Refer to the HIGH VOLTAGE HOLD-DOWN TEST in service adjustments.
PRODUCT SAFETY NOTICE
When replacing components in a receiver, always keep inmind the necessary product safety precautions. Pay specialattention to the replacement of components marked with astar ( ) in the parts list and in the schematic diagrams. Toensure safe product operation, it is necessary to replacethose components with the exact same PARTS.
SAFETY INSTRUCTIONS
0.15 F 150V AC
1500 ohm10 watt
Good earth groundsuch as a water pipe,conduit, etc.
AC OUTLET
TELEVISIONRECEIVER
READING SHOULD NOT EXCEED 750 mV.AC VOLTMETER
(5000 ohms per volt or more sensitivity)
To be touched to all of exposed metal parts.Voltmeter Hook-up for Leakage Current Check.
GENERAL
This set has an on-screen Service Menu system included in the CPU that allows remote operation for most of the service adjustments.To enter the Service Menu, first disconnect the AC power cord. Then while pressing the MENU key on the front control panel, recon-nect the AC power cord. The adjustments can now be made with the remote control or front control panel keys.
ON-SCREEN SERVICE MENU SYSTEM
1. Enter the Service Menu:
While pressing the MENU key on the front control panel, reconnect theAC power cord. The Service Menu Display will now appear. See Figure 1.
2. Service Adjustments:
Press the or key to select the desired service menu item you
want to adjust. (See page 5 for On-screen Service Menu.) Use the + or – key or number keys to adjust the data.
The + or – keys will increase or decrease the data sequentially.The number keys (0 ~ 7) toggle only their respective bits between 1 and 0 and are used to change the Sub-Address. For example tochange bit 5 press the number 5 key. See below.
3. Exit from the Service Menu:
Press the MENU key to turn off the Service Menu display.
SERVICE ADJUSTMENTS
— 3 —
IC802 (EEPROM) REPLACEMENTWhen IC802 (EEPROM) is replaced, IC801 (CPU) will automatically write the initial reference data into IC802 for basic TV operation.However, the bus data should be checked and some bus data should be set up before attempting the service adjustments.(See pages 5 – 7, Table 1, for detailed bus data information.)
INITIAL BUS DATA SETUPNote: When IC802 (EEPROM) is replaced, change the following initial reference data for proper TV operation before
attempting service adjustments.
1. Disconnect the AC power cord (AC 120V line).2. While pressing the MENU key, reconnect the AC power cord. The Service Menu display will now appear.3. Select NO. 3B SCN (Sub Contrast) with or key. Adjust the data with + or – key for 10.4. Select NO. 3C SCO (Sub Color) with or key. Adjust the data with + or – key for 15.5. Select NO. 3D STI (Sub Tint) with or key. Adjust the data with + or – key for 05.6. Select NO. 41 HP (H Phase) with or key. Adjust the data with + or – key for 0F.7. Select NO. 42 VS (V Size) with or key. Adjust the data with + or – key for 5A.8. Select NO. 43 VSP7VKI6VDC (V Sync Sep / V Kill / V DC) with or key. Adjust the data with number keys for 18.9. Select NO. 44 HBL5VLN (H Blk L / V Lin ) with or key. Adjust the data with number keys for 35.
10. Select NO. 45 HBR5VST (H Blk R / V Lin Shift) with or key. Adjust the data with number keys for 43.11. Select NO. 46 VSC (V S Correction) with or key. Adjust the data with + or – key for 0E.12. Select NO. 47 VTS6VC3CDM (V Test / V Comp / Count Dwn Mode) with or key. Adjust the data with number keys
for 28.13. Select NO. 4F SBI (Sub Bias) with or key. Adjust the data with + or – key for 30.14. Select NO. 53 ABL5MSD4RTS3BAT (ABL Def / MID Stop / RGB Temp / ABL Thresh) with or key. Adjust the data
with number keys for 0C.15. Select NO. 55 STR4FLS (S Trap Test / Filter System) with or key. Adjust the data with number keys for 21.16. Select NO. 5B AF7CBP5 (Auto Flesh / C Band Pass) with or key. Adjust the data with number keys for A0.17. Select NO. 5C CKO (Color Killer) with or key. Adjust the data with + or – key for 03.
3C SCO15 00010101
Figure 1. Service Menu Display
ITEM NO.
TITLE
BINARY DATA(8 bit)
HEX DATA
(b7) (b6) (b5) (b4) (b3) (b2) (b1) (b0)
0 1 0 1 0 1 1 0 BINARY DATA(8 bit)
— 4 —
INITIAL BUS DATA SETUP (Cont.)
18. Select NO. 67 VMD6VMG3SSN (VM Delay / VM Gain / Sync Sep Sens) with or key. Adjust the data with numberkeys for 22.
19. Select NO. 69 EWD (E/W DC) with or key. Adjust the data with + or – key for 2A.20. Select NO. 6A EWA (E/W Amp) with or key. Adjust the data with + or – key for 16.21. Select NO. 6B EWT (E/W Tilt) with or key. Adjust the data with + or – key for 29.22. Select NO. 6C ECB4ECT (E/W Corner Btm / E/W Corner Top) with or key. Adjust the data with number keys for 54.23. Select NO. 83 OPT (Aspect Ratio / Surround) with or key. Adjust the data with + or – key for A0.24. Select NO. 84 OP2 (Component / V Guide) with or key. Adjust the data with + or – key for 20.25. Select NO. 86 CBR (RF C Bypass) with or key. Adjust the data with + or – key for 00.26. Select NO. 8C CBT (RF C BPF Test) with or key. Adjust the data with + or – key for 08.27. Select NO. 8D HR (H Display Position) with or key. Adjust the data with + or – key for 24.28. Select NO. 8E SBO (Sub Bright Offset) with or key. Adjust the data with + or – key for 05.29. Select NO. 98 DRY (YUV R-Y Difference) with or key. Adjust the data with + or – key for 0B.30. Select NO. 99 DBY (YUV B-Y Difference) with or key. Adjust the data with + or – key for 10.31. Select NO. A1 EEA (16:9 E/W Amp Difference) with or key. Adjust the data with + or – key for F6.32. Select NO. A7 EVB (16:9 V Blk Sw) with or key. Adjust the data with + or – key for 60.33. Press the MENU key to turn off the Service Menu display.
SERVICE ADJUSTMENTS (Cont.)
— 5 —
Table 1. ON-SCREEN SERVICE MENU
When IC802 (EEPROM) is replaced, check the bus data to confirm they are the same as below. The shaded menu should bechecked and be set up or readjusted according to the procedures described in the following pages. Initial Setup Data markedwith an * should be changed from Initial Reference Data. (See pages 3 and 4 for Initial Bus Data Setup.)
No. TITLE INITIAL REFERENCE INITIAL SETUP INITIAL SETUP FUNCTIONDATA HEX DATA HEX DATA BINARY
3B SCN 0F 10* 00010000 Sub Contrast (4~0)
3C SCO 1F 15* 00010101 Sub Color (5~0)
3D STI 07 05* 00000101 Sub Tint (4~0)
3E SB 18 18 00011000 Sub Bright (5~0)
3F SSH 00 00 00000000 Sub Sharpness (4~0)
40 AFC6HFR 90 90 10010000 AFC(6) Horizontal Frequency (5~0)
41 HP 12 0F* 00001111 Horizontal Phase (4~0)
42 VS 60 5A* 01011010 Vertical Size
43 VSP7VKI6VDC 07 18* 00011000 V Sync Sep (7) V Kill (6) V DC (5~0)
44 HBL5VLN 06 35* 00110101 H Blanking L (6~5) V. Linearity (4~0)
45 HBR5VST 20 43* 01000011 H Blanking R (6~5 V Shift (3~0)
46 VSC 0A 0E* 00001110 Vertical S Correction (4~0)
47 VTS6VC3CDM 38 28* 00101000 V Test (7~6) V Compression (5~3)Count Down Mode (0)
A8 DRVR40 R40 01000000 Red Drive Adjustment (See Note 1.)
R40 R40 01000000 Blue Drive Adjustment (See Note 1.)
– - - - Red Bias Adjustment (See Note 2.)
– - - - Green Bias Adjustment (See Note 2.)
– - - Blue Bias Adjustment (See Note 2.)
— 7 —
PROGRAM CODES
The microprossesor used in this model is a multi-purposetype and is used in several different models. To ensureproper operation and the correct features for your particu-lar model, the program codes must be correct.
Note 1. Option Data 1 (NO. 83 OPT) should be hexadecimal
A0 (10100000 binary). See page 4 INITIAL DATA SETUP,step 23, for set up procedure. If this program code is wrongthe TV will not operate properly.
Note 2. Option Data 2 (NO. 84 OP2) should be hexadecimal
20 (00100000 binary). See page 4 INITIAL DATA SETUP,step 24, for set up procedure. If this program code is wrongthe TV will not operate properly.
Note 1.
Red/Blue Drive Adjustments in Service Menu NO. A8 DRV:
Adjust Red and Blue Drive Levels alternately with 1, 3, 7,and 9 keys on the remote control. See Figure 2. The DriveLevel adjustment data will be written in the Service MenuNo. 4C RD and 4E BD automatically.
1 2 3
4 5 6
7 98
RB(–) RB(+)
BB(–) BB(+)
(N/A)
GB(–) (N/A) GB(+)
(N/A)
FOR RED BIAS ADJUSTMENT
FOR BLUE BIAS ADJUSTMENT
FOR GREEN BIAS ADJUSTMENT
Figure 2.
Figure 3.
1 2 3
4 5 6
7 98
RD(–) RD(+)
BD(–) BD(+)
(N/A)
(N/A) (N/A) (N/A)
(N/A)
FOR RED DRIVE ADJUSTMENT
FOR BLUE DRIVE ADJUSTMENT
Note 2.
Red/Green/Blue Bias Adjustments in Service Menu
A9 (No Vertical Sweep):
Adjust each Bias Level with 1, 3, 4, 6, 7, or 9 key on theremote control. See Figure 3. The Bias Level adjustmentdata will be written in the Service Menu No. 49 RB,No. 4A GB, and No. 4B BB automatically.
DRIVE AND BIAS ADJUSTMENTS
BIT FUNCTIONDATA
0 1
0 ~1 TV / HOTEL / MON N/A N/A
2 VIDEO MODE NONE YES
3 ~4 CLOCK N/A N/A
5 ASPECT RATIO NONE YES
6 NOT USED — —
7 SURROUND NONE YES
BIT FUNCTIONDATA
0 1
0 V-GUIDE NONE YES
1 COLOR ENHANCER N/A N/A
2 INITIAL CH & XDS N/A N/A
3 NOT USED — —
4 PIP N/A N/A
5 COMPONENT NONE YES
6 BASS & TREBLE / TONE N/A N/A
7 GAME N/A N/A
— 8 —
ANTENNA CONNECTIONSThis receiver is designed for UHF/VHF reception. A 75 ohm terminal is provided for UHF and VHF receptions. Whenconnecting a CATV antenna system, connect the 75 ohmcoaxial cable directly to the 75 ohm terminal. For 300 ohmVHF antenna, use an adapter (not included with the TV set).
CIRCUIT PROTECTIONFuse F601 (4A) is included in the AC line. This fuse must bereplaced with the proper fuse (see Parts List).
+B VOLTAGE CHECKConnect Voltmeter + lead to TJ1 130V and – lead to ground(TE7). Connect receiver to AC 120V line. Tune receiver to anactive channel. Reset the picture controls to the FACTORYPRESET levels (press remote control RESET key twice).Voltage must measure between +128.0V and +132.0V. If thevoltage is out of this range, the power circuit must bechecked. No +B adjustment is provided on this chassis.
HORIZONTAL CENTERING ADJUSTMENT1. Tune receiver to an active channel.2. Check that picture is in the horizontal center of TV screen.
If picture is not centered horizontally, perform steps 3 ~ 6.3. Turn off the receiver and disconnect the AC power cord. 4. While pressing the MENU key, reconnect the AC power
cord. The Service Menu display will now appear.5. Select NO. 41 HP (Horizontal Phase) with or key.6. Adjust the data with + or – key for horizontal center. To
turn off the Service Menu display, press the MENU key.
VERTICAL SIZE ADJUSTMENT1. Tune receiver to an active channel.2. Check the vertical size of the picture. If the vertical size is
too large or small, perform steps 3 ~ 6.3. Turn off the receiver and disconnect the AC power cord.4. While pressing the MENU key, reconnect the AC power
cord. The Service Menu display will now appear.5. Select NO. 42 VS (Vertical Size) with or key.6. Adjust the data with + or – key for full scan. To turn off
the Service Menu display, press the MENU key.
VERTICAL CENTERING ADJUSTMENT1. Tune receiver to an active channel.2. Check that picture is in the center of TV screen. If picture
center is too low, change resistor R513 from 1K ohm 1W to470 ohm 1W. If picture center is too high, add resistor R512(1K ohm, 1/2W).
RF AGC ADJUSTMENT1. Tune receiver to strongest VHF station in your area.2. Set contrast and brightness controls for maximum.3. Turn off the receiver and disconnect the AC power cord
(120V AC line).4. While pressing the MENU key, reconnect the AC power
cord. The Service Menu display will now appear.5. Select NO. 62 RAD (RF AGC Delay) with or key.6. Adjust the data with + or – key in the direction which
causes snow to appear; then in the opposite directionuntil the snow just disappears.
7 .To turn off the Service Menu display, press the MENU key.
VIDEO LEVEL
1. Connect color-bar generator to antenna terminals.2. Turn off the receiver and disconnect the AC power cord
(AC 120V line).3. Connect oscilloscope to TP16 (Q132 emitter) and ground.4. While pressing the Menu key, reconnect the AC power
cord. The Service Menu will now appear.5. Select NO. 63 VL (Video Level) with the or key.6. Adjust with the number keys (4~2) for an oscilloscope
reading of 1.0 ± 0.1 VP-P at TP16. Press the MENU key toturn off the Service Menu display.
CAUTIONFOR CONTINUED PROTECTION AGAINST
A RISK OF FIRE, REPLACE ONLY WITH
THE SAME TYPE 4A, 125V FUSE.
ATTENTION : POUR MAINTENIR LA PRO-
TECTION CONTRE LES RISQUES
D’ INCENDIE UTILISER UN FUSIBLE DE
RECHANGE DE MEME TYPE 4A, 125V.
4A 125V
1.0 ± 0.1 VP-P
Figure 4.
SERVICE ADJUSTMENTS (Continued)
— 9 —
GRAYSCALE ADJUSTMENT 1. Set the picture controls to the Auto levels or Reset (use
MENU key and or key or RESET key).2. Turn off the receiver and disconnect the AC power cord
(120V AC line).3. While pressing the MENU key, reconnect the AC power
cord. The Service Menu display will now appear.4. Select NO. 49 RB (Red Bias), NO. 4A GB (Green Bias),
and NO. 4B BB (Blue Bias) with or key and set eachdata to 0 with + or – key.
5. Select NO. 4C RD (Red Drive) and NO. 4E BD (Blue Drive)with or key and set each data to 40 with + or – key.
6. Set NO. 4D GD (Green Drive Reduction) data to 08, NO. 3ESB (Sub-Brightness) data to 18, NO. 3C SCO (Sub Color)data to 15, NO. 3D STI (Sub Tint) to 05, and NO. 3F SSH(Sub Sharpness) data to 00 with or , and + or – keys.
7. Turn Screen Control (T402) to minimum (fully counter-clockwise).
8. Select the Service Menu NO. A9 (No Vertical Sweep)with or key.
9. Advance Screen Control (T402) clockwise to obtain justvisible one color line. If line does not appear, place thiscontrol to maximum (fully clockwise).
10. Raise each Bias Level with 3, 6, and 9 keys to obtain just visible white line. See Figure 5.
11. Select the Service Menu NO. A8 DRV (Drive Adjustments)with or key.
12. Adjust Red and Blue Drive Levels alternately with 1, 3,7, or 9 key to produce normal black and white picture inhighlight areas. See Figure 6.
13. Check for proper grayscale at all brightness levels.To turn off the Service Menu display, press the MENU key.
Note: If Grayscale Adjustment is made after picture tubereplacement, check Brightness Level Adjustment.
FOCUS ADJUSTMENT
Adjust focus control (T402) for well defined scanning lines.
HIGH VOLTAGE CHECK
Note: +B (+130V) Voltage Check and Grayscale Adjustmentmust be completed before attempting high voltageCheck.
1. Connect high voltage voltmeter – lead to ground, andconnect + lead to anode of picture tube.
2. Tune receiver to an active channel and confirm TV isoperating properly.
3. Eliminate the beam current by adjusting the contrastand brightness controls to minimum.
4. Confirm high voltage is within 28.0 KV and 31.1 KV. Ifreading is not within range, check horizontal circuit.
No high voltage adjustment is provided on this chassis.
BRIGHTNESS LEVEL ADJUSTMENT
Note: Grayscale, RF AGC, Video Level, and High Voltage Checkmust be adjusted before attempting Brightness LevelAdjustment.
1. Connect a color-bar generator to the antenna terminals.2. Switch the generator to the crosshatch pattern.3. Reset the picture controls to the Auto levels.4. Connect voltmeter (high impedance) + lead to terminal
TP51 and – lead to terminal TP50 on main board. Setvoltmeter for 1.5V ~ 3V range.
5. Turn off the receiver and disconnect the AC power cord. 6. While pressing the MENU key, reconnect the AC power
cord. The Service Menu display will now appear. 7. Select NO. 3E SB (Sub Brightness) with or key.8. Adjust the data with + or – key for 680mVDC.9. Press the MENU key to turn off the Service Menu display.
10. Check brightness level on every active channel, readjust(repeat steps 5 ~ 9), if necessary.
Note: Do not set to excessive brightness level, otherwisethe contrast level will be suppressed.
1 2 3
4 5 6
7 98
RB(–) RB(+)
BB(–) BB(+)
(N/A)
GB(–) (N/A) GB(+)
(N/A)
FOR RED BIAS ADJUSTMENT
FOR BLUE BIAS ADJUSTMENT
FOR GREEN BIAS ADJUSTMENT
Figure 5. Remote Control Number keys’ functions in
Service Menu NO. A9 (No Vertical Sweep)
1 2 3
4 5 6
7 98
RD(–) RD(+)
BD(–) BD(+)
(N/A)
(N/A) (N/A) (N/A)
(N/A)
Figure 6. Remote Control Number keys’ functions in
Service Menu NO. A8 DRV
FOR RED DRIVE ADJUSTMENT
FOR BLUE DRIVE ADJUSTMENT
— 10 —
SERVICE ADJUSTMENTS (Continued)
HIGH VOLTAGE HOLD-DOWN TEST
Every time the receiver is serviced, the HIGH VOLTAGE HOLD-DOWN circuit must be tested for proper operation by following these steps:
1. Connect receiver to 120V AC line. Tune receiver toactive channel. Reset the picture controls to the Autolevels.
2. Check that the voltage measured between TP7 and TE7(ground side) is within 16.5 VDC to 21 VDC. If the volt-age is out of this range, the Hold-Down Circuit must bechecked.
3. Connect a DC Voltage supply to TP7 and TE7 through a100 ohm 1/4W resistor. Adjust the DC voltage to 23 VDC.The receiver should shutdown, losing raster and sound.Then the receiver should turn off automatically. Thisreaction indicates that the Hold-Down circuit is func-tioning properly. If the receiver does not shutdown, amalfunction is indicated and its cause must be foundand corrected.
4. To obtain picture again, remove the DC Supply and waita few minutes. Now turn on the receiver.
MULTI-SOUND SECTION ADJUSTMENTS
Note: Multi-Sound Section must be adjusted after IC801 (CPU / Signal Processor), IC3401 (MTSDecoder), or IC802 (EEPROM) is replaced.
INPUT LEVEL ADJUSTMENT
1. Connect a signal to the antenna terminals with audio of1 KHZ 100% modulation.
2. Turn off the receiver and disconnect the AC power cord(AC 120V line).
3. Connect voltmeter (RMS) to TP317 and ground.4. While pressing the Menu key, reconnect the AC power
cord. The Service Menu will now appear.5. Select NO. 80 ATT (Attenuation) with the or key.6. Adjust the + or – key for a voltmeter reading of 400 ± 20
mVrms at TP317.
SEPARATION ADJUSTMENT
7. Turn off the receiver and disconnect the AC power cord(AC 120V line).
8. Connect oscilloscope CH1 to TP317 and CH2 to TP318and ground.
9. Connect an MTS TV/Stereo generator to antenna terminal.10. While pressing the Menu key, reconnect the AC power
cord. The Service Menu will now appear.11. Select pilot, 300Hz audio frequency and Left modulating
signal.12. Select NO. 81 WDB (Wide Band) with the or key.13. Adjust the + or – key for minimum low frequencies at
TP317. See Figure 7.14. Select 4 KHz audio frequency and Right modulating signal.15. Select NO. 82 SPC (Spectral) with the or key.16. Adjust the + or – key for minimum high frequencies at
TP318. See Figure 7.
Repeat adjustments (steps 11–16) until no further decreasesin amplitude can be obtained. Press the MENU key to turnoff the Service Menu display.
Minimize L leakage
Minimize R leakage
4KHz
300Hz
TP317 (R)
TP318 (L)
Figure 7. Separation Adjustments
— 11 —
SERVICE HINTS
POWER FAILURE DETECTOR
This unit is equipped with a Power Failure Detector function included in the CPU which checks for an abnormal condition inthe chassis power supplies, including the power supply derived from the Horizontal Output Transformer.
If, while the power is on, a failure is caused by any of the following that results in a low voltage supply, the CPU will turn theunit off in 1.5 seconds to prevent further damage:
• Failure within the power supply circuits.
• A short circuit in the load side from the supply.
• Stoppage of the Horizontal Output Oscillator caused by the X Radiation protection Hold-Down Circuit.
If, while the power is off, the power is switched on and any of these failures remains uncorrected, the CPU will shut off thepower within three seconds.
Check the following if the unit is turned off by the power failure detector.
1. Disconnect the AC power cord (120V AC line) for at least 10 seconds.2. Connect a DC Voltmeter to the following TEST POINTS.
3. Press the Power key and check for the proper voltage supplies.4. If any of these voltages is low, the power failure detector should turn the unit off within three seconds.5. Check all circuits listed above.
Note: This unit is equipped with a Power Surge Protection feature included in the CPU. If power failure occurs three timeswithin 15 minutes, the CPU will automatically stop functioning to help prevent secondary damage. (TV will not turn onby pressing the power key.) To reset the operating programs within the CPU, disconnect the AC power cord for at least10 seconds.
TJ6 5V
D002 Cathode 15V
D429 Cathode 5V
D806 Cathode 30V
— 12 —
MAGNET TABS
ANGLE OF MAGNET TABS
SIX-POLEMAGNET TABS FOUR-POLE
MAGNET TABS
ANGLEOF TABS
PURITYMAGNETTABS
43
21
FOCUS GAP(G3-G4)
Figure 3. Adjusting Magnet
Figure 2. Purity and Convergence Magnets
PURITY ADJUSTMENTS
1. When replacing picture tube or deflection yoke, mountdeflection yoke and purity and convergence magnetsassembly properly. See Figure 1. Position the picturetube facing east or west. Demagnetize the picture tubeand receiver using an external degaussing coil. Setreceiver to Service Menu NO. A9 (no vertical sweep)while degaussing.
2. Place the yoke on tube neck fully forward against glass.3. Place the CPM on the tube neck aligning the center of
the purity magnet tabs over center of Focus Gap (G3 & G4).See Figure 2.
4. Connect a color-bar generator to the antenna terminal.Switch the generator to a white field. Move yoke back-ward on the neck until a uniform white field is obtained.
5. Allow 30 minutes warm up on a blank white field (highintensity grayscale).Note: If white field cannot be obtained check GrayscaleAdjustments on page 9.
6. Reset the picture controls to the Auto levels. Select a greenraster, either with the signal generator or by adjusting thebias controls. If a signal generator is used for this step skipto Step 11. If the bias controls will be used go to step 7.
7. Adjust Service Menu NO. 49 RB (Red Bias), NO. 4A GB(Green Bias), and NO. 4B BB (Blue Bias) data each to 00.
8. Select Service Menu NO. A9 (no vertical sweep).9. Adjust the Screen Control counterclockwise until the
horizontal scan line is no longer visible.10. Select Service Menu NO. 4A GB (Green Bias) and
increase the data to produce a green raster. If retracelines appear reduce screen control slightly.
11. Pull yoke back on tube neck to obtain three-color raster(blue, green and red).
12. Adjust the angle between the two purity magnet tabs to center the vertical green belt in the picture tube. Do notrotate tabs. See Figure 3.
13. Slowly slide the deflection yoke forward until a uniformgreen screen is obtained.
14. Check the purity of the red and blue screens for unifor-mity. Turn off other colors to check (use bias controls oruse generator). If necessary, readjust the yoke positionuntil all screens are pure.
15. If bias controls and screen control were used to set puri-ty reset Grayscale and Bright Level. Refer to GrayscaleAdjustment on page 9 and Brightness Level Adjustmenton page 9.
16. Confirm that the yoke is not tilted. Tighten the yokemounting screw. Adjust convergence next.
RUBBERWEDGE
DEFLECTION YOKE
DEFLECTION YOKEMOUNTING SCREW
Figure 1. Deflection Yoke Movement
PURITY AND CONVERGENCE ADJUSTMENTSCAUTION:The Purity and Convergence adjustments have been made at the factory. Readjustments should be made
only after the picture tube or deflection yoke is replaced. Follow the steps below for necessary readjustments.
— 13 —
BLUEGREEN
RED
BLUEGREENRED
BLUEGREEN
RED
BLUEGREEN
RED
Line movement when adjustingside of yoke in and out.
CENTER CONVERGENCE ADJUSTMENT
1. Connect a crosshatch generator to antenna terminals.2. Set Contrast to low level to eliminate blooming. Reduce
Brightness level to obtain black background if necessary.3. Adjust the angle between the four-pole magnet tabs 1
and 2 (Figure 2), and superimpose the red and blue ver-tical lines in the center area of the picture screen. SeeFigure 4.
4. Keeping the tabs at the same angle, rotate them togetherto superimpose the blue and red horizontal lines in thecenter area of the picture screen. See Figure 4.
5. Adjust the six-pole magnet tabs 3 and 4 so the con-verged red/blue line is superimposed on the green line.This is the same procedure used in steps 3 and 4. SeeFigure 5.
CONVERGENCE ADJUSTMENT
BLUE
RED
Adjust four-pole tabs angle tosuperimpose blue and red verticalline.
Adjust four-pole tabs together to superimpose red and bluehorizontal line.
Figure 4. Blue and Red Line Movement
BLUE / RED
GREEN
Adjust six-pole tabs angle tosuperimpose red / blue andgreen vertical line.
Adjust six-pole tabs together to superimpose red / blue andgreen horizontal line.
REDGREEN
BLUE
RED
GREEN
BLUE
Line movement when adjustingtop of yoke in and out.
Figure 7. Side of Yoke Movement
OUTER AREA CONVERGENCE ADJUSTMENT
The outer area convergence is performed by positioning ofthe yoke as follows:
1. Move the top of the yoke toward or away from the pic-ture tube. This movement will affect the vertical lines atthe top and bottom and the horizontal lines at the sides.See Figure 6.
2. Check that splits at 12 o’clock and 6 o’clock positionsare minimized, adjust yoke for best compromise.Secure with wedge at 12 o’clock position. See Figure 1.
3. Move the side of the yoke toward or away from the pic-ture tube to converge the horizontal lines at the top andbottom and the vertical lines at the sides. See Figure 7.
4. Check that splits at 12 o’clock and 6 o’clock are mini-mized, adjust yoke for best compromise. Secure yokeposition with the side wedges. See Figure 1.
Note: When re-using the rubber wedges, apply a smallamount of silicone rubber adhesive or hot melt toeach of the wedges.
Figure 6. Top of Yoke Movement
Figure 5. Blue/Red and Green Line Movement
— 14 —
MECHANICAL DISASSEMBLIES
CABINET BACK REMOVAL
1. Refer to Figure 1, remove 8 screws.2. Pull off cabinet back and remove.
CHASSIS REMOVAL
1. Remove cabinet back.2. Discharge the picture tube anode (2nd anode lead) to the
4. Remove chassis completely by sliding it straight back.
PICTURE TUBE REMOVAL
CAUTION: Do not disturb the deflection yoke or magnet
assembly on the picture tube neck. Care must be taken to
keep these assemblies intact, unless picture tube is being
replaced. Discharge the picture tube to the coating before
handling the tube.
1. Remove chassis, see Chassis Removal instructions.2. Place cabinet’s front face down on a soft surface.3. Remove the screw on each corner of the picture tube and
GENTLY lift the picture tube out of the cabinet.4. Install a replacement picture tube in reverse order.
Properly install the degaussing coil and picture tubegrounding lead on the picture tube. See Figure 2.
Note: If Picture Tube is being replaced, mount the DegaussingCoil properly on the tube. See Figure 2.
Figure 2. Picture Tube Removal
DEGAUSSINGCOIL
DEGAUSSINGCOIL HOLDER
PICTURE TUBEGROUNDING LEAD
TO PICTURE TUBESOCKET BOARDGROUND
DEGAUSSING COILSOCKET
Figure 1. Cabinet Back Removal
— 15 —
CHASSIS ELECTRICAL PARTS LIST
CAUTION: To Protect against electrical shock and for continued product safety, refer to SAFETY PRECAUTIONS,
X-RADIATION PRECAUTIONS, HIGH VOLTAGE HOLD-DOWN TEST, and PRODUCT SAFETY NOTICE on Page 2.
Notes: Parts having Location Number are located on the following boards.Numbers under 700 Series . . . . . . . . . . . . . . . . . . . . .On the Main Board.Numbers 700 Series . . . . . . . . . . . . . . . . . . . . . . . . . . .On the Picture Tube Socket Board.Numbers 900 Series . . . . . . . . . . . . . . . . . . . . . . . . . . .Out of Board.All Other Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . .On the Main Board
PRODUCT SAFETY NOTICE
PRODUCT SAFETY SHOULD BE CONSIDERED WHEN A REPLACEMENT IS MADE IN ANY AREA OF A RECEIVER.
COMPONENTS INDICATED BY A STAR ( ) IN THIS PARTS LIST AND THE SCHEMATIC DIAGRAM DESIGNATE
COMPONENTS IN WHICH SAFETY CAN BE OF SPECIAL SIGNIFICANCE. IT IS PARTICULARLY RECOMMENDED
THAT ONLY PARTS DESIGNATED ON THE FOLLOWING PARTS LIST BE USED FOR COMPONENT REPLACEMENT
DESIGNATED BY A STAR. NO DEVIATIONS FROM RESISTANCE,WATTAGE, AND VOLTAGE RATINGS MAY BE MADE
FOR REPLACEMENT ITEMS DESIGNATED BY A STAR.
Schematic
LocationPart No. Description
Schematic
LocationPart No. Description
Note: Schematic part location numbers may not always match with the part descriptions.The part descriptions are correct and should be used.
CAPACITORS
NOTES:Read description of the Capacitor as follows:
(Example)CERAMIC 100P K 50V
Rated VoltageTolerance Symbols:less than 10PFA . .Not specifiedB . .±0.1PF C . .±0.25PFD . .±0.5PF F . .±1PFG . .±2PF R . .+0.25 - 0PFS . .+0 - 0.25PF E . .+0 - 1PFmore than 10PFA . .Not specifiedB . .±0.1% C . .±0.25%D . .±0.5% F . .±1%G . .±2% H . .±3%J . .±5% K . .±10%L . .±15% M . .±20%N . .±30% P . .+100 - 0%Q . .+30 - 10% T . .+50 - 10%U . .+75 - 10% V . .+20 - 10%W .+100 - 10% X . .+40 - 20%Y . .+150 - 10% Z . .+80 - 20%
IC001 409 275 7903 IC LA4525 IC501P 409 479 3909 IC LA7848 IC601 409 172 8102 IC SE130NH
IC681 409 528 6202 IC PQ050ES1MXP IC801 410 497 4205 IC LA76952
IC802 409 333 3700 IC 24LC02B/P409 376 1503 IC ST24C02B6409 440 8902 IC M24C02-BN6409 495 6908 IC CAT24WC02P409 528 8404 IC S524A40X21-DCB0410 499 1004 IC AT24C02-10PI-2.7
IC1001 409 424 4906 IC NJM2533MIC3401 409 467 1108 IC CXA2134Q-T6
COILS
LF601 645 012 0589 LINE FILTER645 052 6862 LINE FILTER
POWER ON: POWER OFF:Q695-E 27.5 8.0Q701-B 2.4Q701-C 154.9Q701-E 2.2Q711-B 2.4Q711-C 158.0Q711-E 2.2Q721-B 2.3Q721-C 159.0Q721-E 2.2Q831-B 4.2Q831-C 4.9Q831-E 4.9
MODEL DS24424 Chassis No. 24424-00
SCHEMATIC DIAGRAMS
CAPACITOR AND RESISTOR CODE CHART
CAPACITOR (Example)
500 C K 1500 B D ........................... ±0.5pFT ............................ +50% –10%J ............................ ±5%K ........................... ±10%M ........................... ±20%N ........................... ±30%
Characteristics P ........................... +100% –0%Value code Z ........................... +80% –20%Tolerance code C ........................... ±0.25pFMaterial code C ........................... CeramicVoltage rating E ........................... Electrolytic
F ........................... PolyesterN ........................... PolypropyleneT ............................ TantalumK ........................... CeramicH ........................... MT-CompositeP ........................... NP. ElectrolyticM ........................... MT-Polypropylene
RESISTOR (Example)
6 Y K 4.7 D ........................... ±0.5%F ........................... ±1%G ........................... ±2%J ............................ ±5%
Value code K ........................... ±10%Tolerance code M ........................... ±20%Material code F ............................ FusibleWattage rating N ........................... Metalized Carbon
FOR CONTINUED PROTECTION AGAINSTA RISK OF FIRE, REPLACE ONLY WITHTHE SAME TYPE 4A, 125V FUSE.ATTENTION: POUR MAINTENIR LA PROTECTIONCONTRE LES RISQUES D' INCENDIE UTILISER UNFUSIBLE DE RECHANGE DE MEME TYPE 4A, 125V.
CAUTION
4A 125V
BLOCK DIAGRAM
STANDBY MODEALWAYS +5VCONTROL
Q693,Q695
Q635OVERLOADPROTECT.D612
PHOTOCOUPLER
IC601POWERREG.
Q68112V SWDRIVE
IC6815V REG.
D601-D604FULL WAVERECTIFIER
Q613ERR.AMP.
Q611Q612OSC
Q601SW.
T601CONVERTERTRANS.
LF601LINEFILTER
PS601POSISTOR
L901DEGAUSINGCOIL
AC120V60Hz
F601ACFUSE
C601D627
+130V
+30V
D624TJ1
D625
D623
4A 125V
+12V
Q62712V SW.
12
47
21
17
44
H-PULSE
15
H-DRIVE
E/W
V-DRIVE
ABL IN
ABL
ACL IN
Pb IN
Pr IN
C IN
C0MP-Y IN
13
14
G
R
B
h2bam
IC001AUDIOAMP.
7 L
6
2
1 SP901LEFTSPEAKER
Q4869V REG.
Q4905V REG.
5VALWAYS
12V
9VTJ5
5VB6
D801
Q001POWER OFFNOISECANCEL
RL601RELAY
+12V
4
3 LS OUT-R
LS OUT-L
373613
IC3401MTS DECODER
5
6
SDL
SCL
YC
S-SW
VIDEO IN-2
AUDIO IN-2 (L)
K1001REARAV IN(AV2)
VIDEO IN-2 (R)
Y
Pb COMPONENT
Pr
VIDEO IN-1
AUDIO IN-1 (L)K1011FRONTAV IN(AV 1)
AUDIO IN-1 (R)
3433
K1051S-VIDEO IN
AUDIO +B
Q005AUDIO +BSWITCH
3 SP902RIGHTSPEAKER
POWERFAIL
POWER ON/OFF
25 29
63 60
Q132BUFFER
Q131BUFFER
TP16
5664
IC802EEPROM
Q831RESET
6
5
A1901RC PRE-AMP
SW1901-1906CONTROL KEYS
BUS SCL
BUS SDA
IIC SCL
IIC SDA
RC IN
KEY IN
S-SW
X IN
X OUT
X 801
C809
C808
A101UHF/VHF TUNER WITH PLL & BAND SW
IF
AGC
ANTX141SAWFILTER
VIDEODET.
VIDEOSW.
VIDEOAMP.
VDRIVE
HDRIVE
FMDET.
FMAMP.
I/OPORTS
VIDEOMATRIX
I/OPORTS
CLOCKCONTROL
SYNCSEP.
RGBDRIVECUT/OFF
32
61
39
31
36
26
28
27
40RESET
33
34
S-Y IN46
AV1/2S
IC1001AV SW
23
54
5
3 V2 IN
V1 IN1
2
7
MUTE24
45
49
48
51
37
10
IC501VERT.OUTPUT
Q401HORIZ.DRIVE
T401H-DRIVETRANS.
Q402HORIZ.OUTPUT
HOLD DOWNDETECT.
HOLD DOWN
T402HORIZ.OUTPUTTRANS.
H.V.
DEFLECTIONYOKEL902
ABL
FOCUSSCREENHEATER
LOW +B
AUDIO +B
+200V
6/7
9
5
84
1
V
H2
9
Q721
Q711
Q701
-R OUT
-G OUT
-B OUT
Q901PIX TUBE
(7V)
D429D428(13V)
R428
ANODE LEAKDETECT.
R
D482
5
POWER FAILD002
15VD471
D481
D806
H-PULSE
WAVEFORMS
Note: Voltages were measured with offset color-bar signal and controls set for normal picture.
IC801- 12
(R-Output)
4.0V HORIZ
IC801- 13
(G-Output)
3.8V HORIZ
IC801- 14
(B-Output)
4.0V HORIZ
IC801- 54
(Video Input)
1.0V HORIZ
IC501- 5(Vertical Output)
48 VERT
IC501- 1(Inverting Input)
0.6V VERT
Q132-E (TP16)(Internal Video)
1.0V HORIZ
Q401- B(Horizontal Drive)
.7V HORZ
Q402- B(Horizontal Output)
21V HORZ
T402- 9(Heater)
28V HORIZ
Q601- G(Power Switching)
15V 50KHz
VOLTAGE CHARTS
NOTE: Voltages were measured using color-bar signal and the controls set for normal picture.
SERVICE NOTES:
1. When replacing parts on circuit boards, clamp the lead wires to terminals before soldering.2. When replacing high wattage resistors on circuit board, keep the resistor body 10 mm (3/8) from circuit board.3. Keep wires away from high voltage and high temperature components.
PRODUCT SAFETY NOTICE
THE COMPONENTS DESIGNATED BY A STAR ( ) ON THIS SCHEMATIC DIAGRAM DESIGNATE COMPONENTS
WHOSE VALUES ARE OF SPECIAL SIGNIFICANCE TO PRODUCT SAFETY. SHOULD ANY COMPONENT
DESIGNATED BY A STAR NEED TO BE REPLACED, USE ONLY THE PART DESIGNATED IN THE PARTS LIST. DO NOT
DEVIATE FROM THE RESISTANCE, WATTAGE AND VOLTAGE RATINGS SHOWN.
X-RADIATION WARNING NOTE
THIS TV CONTAINS CRITICAL PARTS TO PROTECT AGAINST X-RADIATION. NOMINAL 2ND ANODE VOLTAGE IS
29.1KV AT ZERO BEAM CURRENT AT 120 VOLTS AC LINE, AND MUST NOT EXCEED 31.1KV UNDER ANY
OPERATING CONDITION. SEE HIGH VOLTAGE CHECK ON PAGE 9.
11 1
1
TOP VIEW
SIDE VIEW
COUNT TERMINALS INARROW DIRECTION
MARK
ECB
A K
A K
A KA K
AK
AK
INFRARED EMITTING
A....ANODEK....CATHODE
INTEGRATED CIRCUITS TRANSISTORS
1
DIODESPHOTO COUPLERS
B ... BASEC ... COLLECTORE ... EMITTER
E CBE CB E C
BE C
BE CB
ECB E CB
ECB
321 3 21 GND(2)IN
(1)
OUT(3)
1 1
TOP VIEW
1
CHIP TRANSISTORS
B
C
E
TOP VIEW
B ... BASEC ... COLLECTORE ... EMITTER
CHIP RESISTORS
TOP VIEW
123
12 x 10 = 12K ohm3
NOTES ON SCHEMATIC DIAGRAMS
1. All resistance values in ohms K=1,000 M=1,000,000.2. Unless otherwise noted on schematic, all capacitor values less than 1 are expressed in µF (Micro Farad),
and the values more than 1 are in pF.3. Unless otherwise noted on schematic, voltage reading taken with VOM from point indicated to chassis
ground. Voltage reading taken using color-bar signal VHF channel 5, all controls at normal. Line voltage at 120volts. Some voltages may vary with signal strength.
4. Waveforms were taken with color-bar signal and controls set for normal picture. Waveforms marked withan may vary with signal strength.
5. The Symbol indicates a fusible resistor, which protects the circuit from possible short circuits.