SANYO ds24424 Service Manual

Specifications

Power Rating . . . . . . . . . . . . . . . . . . . . . 120V, 60Hz

78W (Avg), 2.0A (Max)

Antenna Input Impedance . . . . . . . . . . . . . . . . . 75Ω

UHF/VHF/CATV

Receiving Channel . . . . . . . . . . . . . . . . 2 - 13 (VHF),

14 - 69 (UHF),

01, 14-94, 95-125 (CATV)

Remote Ready . . . . . . . . . . 33 Key Remote Control

Sound Output . . . . . . . . . . . . . . . . . . . . . . 1.0 W/CH

Intermediate Frequency

Picture IF Carrier. . . . . . . . . . . . . . . . . . 45.75MHz

Sound IF Carrier . . . . . . . . . . . . . . . . . . 41.25MHz

Color Sub Carrier . . . . . . . . . . . . . . . . . 42.17MHz

Picture Tube . . . . . . . . . . . . . . . . . A59QDF891X(ST)

Semiconductors

Integrated Circuits. . . . . . . . . . . . . . . . . . . . . . . . 8

Transistors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Except within Tuner and RC Pre-Amp.

Cabinet Dimensions

Width. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 677mm

Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . 524mm

Depth. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 480mm

REFERENCE No. SM780092

DS24424, H2BAM, PRODUCT CODE 111370380

Contents

Safety Instructions . . . . . . . . . . . . . . . . . . 2

Service Adjustments. . . . . . . . . . . . . 3 - 10

Service Hints. . . . . . . . . . . . . . . . . . . . . . 11

Purity and Convergence . . . . . . . . . 12 - 13

Mechanical Disassemblies. . . . . . . . . . . 14

Chassis Electrical Parts List . . . . . . 15 - 22

Cabinet Parts List . . . . . . . . . . . . . . . . . . 23

Component and Test Point

Locations . . . . . . . . . . . . . . . . . . . 24 - 27

Schematic Insert . . . . . . . . . . . . . . . 29 - 36

Schematic Notes . . . . . . . . . . . . . . . . . 29

Pin Layouts . . . . . . . . . . . . . . . . . . . . . 29

Capacitor and Resistor Codes . . . . . . 29

Block Diagram . . . . . . . . . . . . . . . 30 - 31

Voltage Charts . . . . . . . . . . . . . . . 30 - 32

Waveforms. . . . . . . . . . . . . . . . . . . . . . 32

Schematic Diagrams . . . . . . . . . . 33 - 36

SERVICE MANUAL Remote Control Color

Television

DS24424 (U.S.A.)

(CANADA)

ORIGINAL VERSION

Chassis No. 24424-00

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.

FILE NO.

AS

— 2 —

SAFETY PRECAUTIONS

WARNING: The chassis of this receiver has a floating
ground with the potential of one half the AC line voltage in
respect to earth ground. Service should not be attempted by
anyone not familiar with the precautions necessary when
working 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 ser­vice is performed on the receiver.

2. Comply with all caution and safety-related notes provid­ed on the side of the cabinet, inside the cabinet, on the
chassis, and the picture tube.

3. When replacing a chassis in the cabinet, always be certain
that all the protective devices are installed properly, such
as control knobs, adjustment covers, shields and barriers.

DO NOT OPERATE THIS TELEVISION RECEIVER
WITHOUT THE PROTECTIVE SHIELD IN POSITION AND
PROPERLY SECURED.

4. Before replacing the back cover of the set, thoroughly
inspect the inside of the cabinet to see that no stray parts
or tools have been left inside.
Before returning any television to the customer, the
service technician must perform the following safety
checks 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 a
jumper across the two blades. Connect one lead of an ohm­meter to the jumpered AC plug, and touch the other lead to
each exposed antenna terminal (UHF and VHF antenna ter­minals). The resistance must measure between 1M ohm and

5.2M ohm. Any resistance value below or above this range

indicates an abnormality which requires corrective action.

LEAKAGE CURRENT CHECK

Plug the AC line cord directly into a 120 VAC outlet. (Do not
use an isolation transformer for this check.) Use an AC volt­meter, that has 5000 ohms per volt or more sensitivity.
Connect a 1500 ohm 10 watt resistor, paralleled by a 0.15 µF
150 VAC capacitor, between a known good earth ground
(water pipe, conduit, etc.) and all exposed metal parts of the
cabinet (antennas, handle bracket, metal cabinet, screw
heads, metal overlays, control shafts, etc.). Measure the AC
voltage across the 1500 ohm resistor. The AC voltage
should not exceed 750 mV. A reading exceeding 750 mV
indicates that a dangerous potential exists. The fault must
be located and corrected. Repeat the above test with the
receiver 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 is
the picture tube. The picture tube is specially constructed to
limit 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 high
voltage may produce potentially hazardous X-RADIATION. To
avoid such hazards, the high voltage must be maintained within
specific limits. Refer to the X-RADIATION WARNING NOTE on
the CHASSIS SCHEMATIC in this service manual for specific
high voltage limits. If the high voltage exceeds specified limits,
check the components specified on the chassis schematic
diagram and take the necessary corrective action. Carefully
follow the instructions for the +B Voltage Check and the High
Voltage Check to maintain the high voltage within the specified
limits.

HIGH VOL T AGE HOLD-DOWN TEST

To prevent X-RADIATION from the picture tube due to
excessive high voltage, a HOLD-DOWN circuit is provided in
the high voltage circuit. Every time the receiver is serviced,
the high voltage HOLD-DOWN circuit must be tested for
proper operation. Refer to the HIGH VOLTAGE HOLD­DOWN TEST in service adjustments.

PRODUCT SAFETY NOTICE

When replacing components in a receiver, always keep in
mind the necessary product safety precautions. Pay special
attention to the replacement of components marked with a
star (★) in the parts list and in the schematic diagrams. To
ensure safe product operation, it is necessary to replace
those components with the exact same PARTS.

SAFETY INSTRUCTIONS

READING SHOULD NOT EXCEED 750 mV.

AC VOLTMETER

(5000 ohms per volt or more sensitivity)

TELEVISION

RECEIVER

Good earth ground
such as a water pipe,
conduit, etc.

AC OUTLET

1500 ohm

10 watt

0.15 F 150V AC

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, recon­nect 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 the

AC 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 to
change 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 AD JUSTMENTS

— 3 —

IC802 (EEPROM) REPLACEMENT

When 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 SETUP

Note: 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 SCO
15 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 number
keys 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 AD JUSTMENTS (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 be
checked and be set up or readjusted according to the procedures described in the following pages. Initial Setup Data marked
with 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

FUNCTION

DATA 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)
48 FBS4GRY2CRS 10 10 00010000 VNS (7) V Blk (6~5) FBP Blk (4) Gray Mode (2) CRS (1~0)
49 RB 00 00 00000000 Red Bias (7~0)
4A GB 00 00 00000000 Green Bias (7~0)
4B BB 00 00 00000000 Blue Bias (7~0)
4C RD 40 40 01000000 Red Drive (6~0)

4D GD 08 08 00001000 Green Drive (3~0)

4E BD 40 40 01000000 Blue Drive (6~0)
4F SBI 40 30* 00110000 Sub Bias (6~0)
50 ↓↓↓↓Not Used
51 ↓↓↓↓Not Used
52 OSD 03 03 00000011 On Screen Display Contrast (1~0)
53 ABL5MSD4RTS3BAT 04 0C* 00001100 ABL Defeat (5) MID Stop (4) RGB Temp (3) ABL Thresh (2~0)
54 CRG 12 12 00010010 Coring Gain (7~6)
55 STR4FLS 41 21* 00100001 S Trap Test (6~4) Y/C Filter Mode (2~0)
56 YAP6PRE4OVR2WP 00 00 00000000 Y APF (6) Pre Shoot (5~4) Over Shoot (3~2) White Peak (1~0)
57 YGM6DCR4BSS2BSG 04 04 00000100 Y Gam (7~6) DC Res (5~4) B Strk Start (3~2) B Strk Gain (1~0)
58 CBT3 60 60 01100000 Cb Trap (7~3)
59 ↓↓↓↓Not Used
5A ↓↓↓↓Not Used
5B AF7CBP5 20 A0* 10100000 Auto Flesh (7) C Bypass (5)
5C CKO 07 03* 00000011 Color Killer (2~0)

5D RYA 08 08 00001000 R-Y/B-Y Angle (3~0)

5E CBO4CRO 98 98 10011000 Cb DC Offset (7~4) Cr DC Offset (3~0)
5F GYA3 00 00 00000000 G-Y Angle (3)
60 ↓↓↓↓Not Used
61 FMM5 00 00 00000000 FM Mute (5)
62 IAS7STS6RAD 60 60 01100000 IF AGC (7) S Trap SW (6) RF AGC (5~0)
63 VIF5VL 10 10 00010000 VIF System SW (5) Video Level (4~2)
64 VCO1 80 80 10000000 VCO Freq (7~1)
65 OMS6OML 20 20 00100000 Over Mod SW (6) Over Mod Level (5~2)
66 ↓↓↓↓Not Used
67 VMD6VMG3SSN 24 22* 00100010 VM delay (7~6) VM Gain (5~3) Sync Sep Sens(2~0)
68 ↓↓↓↓Not Used
69 EWD 2E 2A* 00101010 E/W DC (5~0)
6A EWA 12 16* 00010110 E/W Amp (5~0)
6B EWT 23 29* 00101001 E/W Tilt (5~0)

— 6 —

Table 1. ON-SCREEN SERVICE MENU (Continued)

SERVICE AD JUSTMENTS (Cont.)

No. TITLE

INITIAL REFERENCE INITIAL SETUP INITIAL SETUP

FUNCTION

DATA HEX DATA HEX DATA BINARY
6C ECB4ECT 33 54* 01010100 E/W Corner Bottom(7~4) E/W Corner Top (3~0)
6D EWS7ETS3HSC 84 84 10000100 E/W Correction Sw(7) E/W Test (5~3) H Size Comp (2~0)
6E ↓↓↓↓Not Used
6F ↓↓↓↓Not Used
80 ATT 07 07 00000111 Attenuation -MTS Input Level (3~0)
81 WDB 20 20 00100000 Wide Band - Low Separation (5~0)
82 SPC 20 20 00100000 Spectral - High Separation (5~3)
83 OPT 80 A0* 10100000 Surround (7) Aspect Ratio (5)
84 OP2 00 20* 00100000 V Guide(7)
85 FLR 00 00 00000000 RF Filter System (2~0)
86 CBR 20 00* 00000000 RF C Bypass (5)
87 CDR 00 00 00000000 RF Count Down Mode (0)
88 CGR 40 40 01000000 RF Coring Gain (6)
89 AFR 00 00 00000000 RF AFC Gain & Gate (6)
8A ROV 0C 0C 00001100 RF Over Shoot Adjust (3~2)
8B RPR 00 00 00000000 RF Pre Shoot Adjust (5~4)
8C CBT 00 08* 00001000 RF C BPF Test (4~3)
8D HR 13 24* 00100100 OSD H Display Position (7~0)
8E SBO 03 05* 00000101 Sub Bright Offset (5~0)
8F DFL 02 02 00000010 YUV Filter System (2~0)
90 DCN 00 00 00000000 YUV Sub Contrast (6~0)
91 DBR 00 00 00000000 YUV Sub Bright (6~0)
92 DCL 00 00 00000000 YUV Sub Color (6~0)
93 DTN 00 00 00000000 YUV Sub Tint (6~0)
94 DSH 00 00 00000000 YUV Sub Sharpness (6~0)
95 DCG 00 00 00000000 YUV Sub Coring (6)
96 DVG 00 00 00000000 YUV Sub VM Gain (5~0)
97 DHS 00 00 00000000 YUV Sub E/W DC (5~0)
98 DRY 06 0B* 00001011 YUV R-Y Offset (3~0)
99 DBY 70 10* 00010000 YUV B-Y Offset (7~4)
9A DYA 00 00 00000000 YUV APF (6)
9B ECN E0 E0 11100000 16:9 Sub Contrast (6~0)
9C EBR 00 00 00000000 16:9 Sub Bright (6~0)
9D ECL 00 00 00000000 16:9 Sub Color (6~0)
9E ETN 00 00 00000000 16:9 Sub Tint (6~0)
9F EVS D4 D4 11010100 16:9 Sub V Size (6~0)
A0 EVP 00 00 00000000 16:9 Sub V Position (3~0)
A1 EEA F8 F6* 11110110 16:9 Sub E/W Amp (5~0)
A2 EET 03 03 00000011 16:9 Sub E/W Tilt (5~0)
A3 EEP FF FF 11111111 16:9 Sub E/W Corner Top (3~0)
A4 EEB 00 00 00000000 16:9 Sub E/W Corner Bottom (7~4)
A5 EUV 00 00 00000000 16:9 Sub V Linearity (4~0)
A6 B16 00 00 00000000 16:9 ABL VTH Sw (5)
A7 EVB 02 60* 01100000 16:9 V Blanking SW (6~5)

A8 DRV

R40 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-purpose
type and is used in several different models. To ensure
proper operation and the correct features for your particu­lar 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 wrong
the 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 wrong
the 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 Drive
Level adjustment data will be written in the Service Menu
No. 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 the
remote control. See Figure 3. The Bias Level adjustment
data will be written in the Service Menu No. 49 RB,
No. 4A GB, and No. 4B BB automatically.

DRIVE AND BIAS AD JUSTMENTS

BIT FUNCTION

DATA

01

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 FUNCTION

DATA

01

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 CONNECTIONS

This receiver is designed for UHF/VHF reception. A 75 ohm
terminal is provided for UHF and VHF receptions. When
connecting a CATV antenna system, connect the 75 ohm
coaxial cable directly to the 75 ohm terminal. For 300 ohm
VHF antenna, use an adapter (not included with the TV set).

CIRCUIT PROTECTION

Fuse F601 (4A) is included in the AC line. This fuse must be
replaced with the proper fuse (see Parts List).

+B VOL T AGE CHECK

Connect Voltmeter + lead to TJ1 130V and – lead to ground
(TE7). Connect receiver to AC 120V line. Tune receiver to an
active channel. Reset the picture controls to the FACTORY
PRESET levels (press remote control RESET key twice).
Voltage must measure between +128.0V and +132.0V. If the
voltage is out of this range, the power circuit must be
checked. No +B adjustment is provided on this chassis.

HORIZONTAL CENTERING ADJUSTMENT

1. 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 ADJUSTMENT

1. 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 ADJUSTMENT

1. Tune receiver to an active channel.

2. Ch ec k that picture is in the center of TV screen. If picture
center is too low, change resistor R513 from 1K ohm 1W to
470 ohm 1W. If picture center is too high, add resistor R512
(1K ohm, 1/2W).

RF AGC ADJUS TMENT

1. 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 direction
until 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 to
turn off the Service Menu display.

CAUTION

FOR CONTINUED PROTECTION AGAINST
A RISK OF FIRE, REPLACE ONLY WITH
THE SAME TYPE 4A, 125V FUSE.

ATTENTION : POUR MAINTENIR LA PRO­TECTION CONTRE LES RISQUES
D’ INCENDIE UTILISER UN FUSIBLE DE
RECHANGE DE MEME TYPE 4A, 125V.

1.0 ± 0.1 VP-P

Figure 4.

SERVICE AD JUSTMENTS (Continued)

4A 125V

— 9 —

GRA Y SCALE ADJUS TMENT

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 each
data 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. 3E
SB (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 counter­clockwise).

8. Select the Service Menu NO. A9 (No Vertical Sweep)
with ▲ or ▼ key.

9. Advance Screen Control (T402) clockwise to obtain just
visible one color line. If line does not appear, place this
control 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 in
highlight 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 tube

replacement, check Brightness Level Adjustment.

FOCUS ADJUSTMENT

Adjust focus control (T402) for well defined scanning lines.

HIGH VOL T AGE CHECK

Note: +B (+130V) Voltage Check and Grayscale Adjustment

must be completed before attempting high voltage
Check.

1. Connect high voltage voltmeter – lead to ground, and
connect + lead to anode of picture tube.

2. Tune receiver to an active channel and confirm TV is
operating properly.

3. Eliminate the beam current by adjusting the contrast
and brightness controls to minimum.

4. Confirm high voltage is within 28.0 KV and 31.1 KV. If
reading 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 Check

must be adjusted before attempting Brightness Level
Adjustment.

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. Set
voltmeter 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, otherwise

the 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