Sanyo DS-13320 NTSC Schematic

Specifications

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

45W (Avg), 1.1A (Max)

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

UHF/VHF/CATV

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

14 - 69 (UHF),

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

Remote Ready . . . . . . . . . . 24 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 . . . . . . . . . A34JRY24X/A34KPU02XX/

A34KPU03XX/A34JRY24X(DT)

Semiconductors

Integrated Circuits. . . . . . . . . . . . . . . . . . . . . . . . 7

Transistors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Except within Tuner and RC Pre-Amp.

Cabinet Dimensions

Width. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 372mm

Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335mm

Depth. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 373mm

REFERENCE No. SM780076

DS13320, G6LWM, PRODUCT CODE 111340597

AS

FILE NO.

Contents

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

Service Adjustments. . . . . . . . . . . . . . 3 - 8

Service Hints. . . . . . . . . . . . . . . . . . . . . . . 9

Purity and Convergence . . . . . . . . . 10 - 11

Mechanical Disassemblies. . . . . . . . . . . 12

Chassis Electrical Parts List . . . . . . 13 - 18

Cabinet Parts List . . . . . . . . . . . . . . . . . . 19

Component and Test Point

Locations . . . . . . . . . . . . . . . . . . . 20 - 23

Schematic Insert . . . . . . . . . . . . . . . 25 - 32

Schematic Notes . . . . . . . . . . . . . . . . . 25

Pin Layouts . . . . . . . . . . . . . . . . . . . . . 25

Capacitor and Resistor Codes . . . . . . 25

Block Diagram. . . . . . . . . . . . . . . 26 - 27

Voltage Charts . . . . . . . . . . . . . . . 26 - 27

Waveforms. . . . . . . . . . . . . . . . . . . . . . 28

Schematic Diagrams . . . . . . . . . . 29 - 32

SERVICE MANUAL Remote Control Color

Television

DS13320 (U.S.A.)

(CANADA)

ORIGINAL VERSION

Chassis No. 13320-00

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.

A-PDF MERGER DEMO

GA

ME

AS

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VOL

POWER

VIDEO IN AUDIO IN

— 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 µF 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.

ON-SCREEN SERVICE MENU SYSTEM

1. Enter the Service Menu:

• While pressing the MENU key, 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 4 for On-screen Service

Menu.)

• Use the + or – key to adjust the data.

3. Exit from the Service Menu:

• Press the MENU key to turn off the Service Menu display.

SERVICE AD JUSTMENTS

— 3 —

OPT XX

Figure 1. Service Menu Display

TITLE

HEXADECIMAL DATA

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 4 – 5 for detailed information.)

INITIAL BUS DATA SETUP

Note:When IC802 (EEPROM) is replaced, the Service Menu No. 4 VS (V Size), No. 10 VSC (V S Cor.) , No. 28 PRE (Pre Shoot

Adj), No. 32 BSG (Blk Str Gain), No. 42 RAD (RF AGC Delay), No. 48 SCO (Sub Color), No. 49 STI (Sub Tint), No. 50 SSH
(Sub Sharpness), No. 51 OPT (Option 1), and No. 52 OPT2 (Option 2) should be set up for proper TV operation before
attempting the service adjustments.

Bus data is in the hexadecimal format.

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. 4 VS (V Size) with ▲ or ▼ key. Adjust the data with + or – key for 40.

4. Select No. 10 VSC (V S Cor.), with ▲ or ▼ key. Adjust the data with + or – key for 07.

5. Select No. 23 POS (Pre/Over/SW), with ▲ or ▼ key. Adjust the data with + or – key for 01.

6. Select No. 28 PRE (Pre Shoot Adj), with ▲ or ▼ key. Adjust the data with + or – key for 02.

7. Select No. 32 BSG (Blk Str Gain), with ▲ or ▼ key. Adjust the data with + or – key for 02.

8. Select No. 42 RAD (RF AGC Delay), with ▲ or ▼ key. Adjust the data with + or – key for 20.

9. Select No. 45 FL (FM Level) with ▲ or ▼ key. Adjust the data with + or – key for 15.

10. Select No. 48 SCO (Sub Color) with ▲ or ▼ key. Adjust the data with + or – key for 07.

11. Select No. 49 STI (Sub Tint) with ▲ or ▼ key. Adjust the data with + or – key for 14.

12. Select No. 50 SSH (Sub Sharpness) with ▲ or ▼ key. Adjust the data with + or – key for 0C.

13. Select No. 51 OPT (Option 1) with ▲ or ▼ key. Adjust the data with + or – key for 04.

14. Select No. 52 OPT2 (Option 2) with ▲ or ▼ key. Adjust the data with + or – key for 80.

15. Press the MENU key to turn off the Service Menu display.

No. TITLE

INITIAL REFERENCE INITIAL SETUP

RANGE OF DATA FUNCTION

DATA DATA
1 HFR 1E 1E 00~3F Horizontal Frequency
2 AFC 00 00 00, 01 AFC Gain and Gate
3 HP 0E 0E 00~1F Horizontal Phase (Horizontal Centering)
4 VS 32 40* 00~7F Vertical Size
5 VPO 05 05 00~3F Vertical Position
6 VSP 00 00 00, 01 Vertical Set Up (Sync Sensitivity)
7 VLN 13 13 00~1F Vertical Linearity
8 CRS 00 00 00~03 Cross B/W
9 GRY 01 01 00, 01 Grey Mode

10 VSC 08 07* 00~1F Vertical S Correction
11 HBR 03 03 00~07 Horizontal Blanking Right
12 HBL 04 04 00~07 Horizontal Blanking Left
13 CDM 00 00 00, 01 Color Difference Mode
14 VC 07 07 00~07 Vertical Compression
15 RB 00 00 00~FF Red Bias
16 GB 00 00 00~FF Green Bias
17 BB 00 00 00~FF Blue Bias
18 RD 40 40 00~7F Red Drive
19 GD 08 08 00~0F Green Drive Reduction
20 BD 40 40 00~7F Blue Drive
21 SBI 40 30 00~7F Sub Bias
22 OSD 02 02 00~03 On Screen Display Contrast
23 POS 01 01 00, 01 Preshoot Overshoot Switch
24 FLS 01 01 00, 01 Filter System
25 CKO 03 03 00~07 Color Killer Operation
26 GYA 00 00 00, 01 G-Y Angle
27 CRG 02 02 00~03 Corring Gain
28 PRE 03 02* 00~03 Preshoot Adjust
29 WP 01 01 00, 01 White Peak Limiter 01: OFF 00: ON
30 FSW 00 00 00, o1 Flyback Blanking Switch
31 VBL 00 00 00, 01 Vertical Blanking Switch
32 BSG 01 02* 00~03 Black Stretch Gain
33 BSS 01 01 00~03 Black Stretch Start
34 DCR 01 01 00~03 DC Reset
35 YGM 01 01 00~03 Y Gamma Start
36 CBP 00 00 00, 01 C Bypass
37 AF 01 01 00, 01 Auto Flesh 0: OFF 1: ON
38 BAT 04 04 00~07 Bright ABL Threshold
39 MSD 00 00 00, 01 Mid Stop Defeat
40 ABL 00 00 00, 01 ABL Defeat 0: OFF 1: ON
41 RYA 02 02 00~0F R-Y/B-Y Angle
42 RAD 0F 20* 00~3F RF AGC Delay
43 IAS 00 00 00. 01 IF AGC Switch 0: TV (Normal) 1: AV (IF Gain Minimum)
44 FMM 00 00 00, 01 FM Mute

— 4 —

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 page 3 for Initial Bus Data Setup.)

NO. TITLE

INITIAL REFERENCE INITIAL SETUP

RANGE OF DATA FUNCTION

DATA DATA
45 FL 0F 0F 00~1F FM Level
46 VL 05 05 00~07 Video Level
47 SB 20 20 00~3F Sub Bright
48 SCO 0A 07* 00~1F Sub Color
49 STI 16 14* 00~1F Sub-Tint
50 SSH 12 0C* 00~1F Sub Sharpness
51 OPT 00 04* 00~FF Option 1 (See Note 1 below.)
52 OPT2 00 80* 00~FF Option 2 (See Note 2 below.)
53 HR 13 13 00~3F On Screen Display Horizontal Position
54 SBO 05 05 00~FF Sub Bright Offset

55 DRV

R40 R40 00~7F Red Drive Adjustment (See Note 3 below.)
R40 R40 00~7F Blue Drive Adjustment (See Note 3 below.)

– 0 0 00~FF Red Bias Adjustment (See Note 4 below.)

56 – 0 0 00~FF Green Bias Adjustment (See Note 4 below.)

– 0 0 00~FF Blue Bias Adjustment (See Note 4 below.)

57 R00 0 0 00~FF N/A

↓↓ ↓ ↓ ↓ ↓

115 R48 0 0 00~FF N/A

— 5 —

Table 1. ON-SCREEN SERVICE MENU (Continued)

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 page 3 for Initial Bus Data Setup.)

PROGRAM CODE

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 Code must be correct.

Note 1. Option Data (NO. 51 OPT) should be set to hexa­decimal 04. See page 3 INITIAL DATA SETUP step 13 for set

up procedure. If this program code is wrong the TV will not
operate properly.

Note 2. Option Data (NO. 52 OPT2) should be set to hexa­decimal 80. See page 3 INITIAL DATA SETUP step 14 for set

up procedure. If this program code is wrong the TV will not
operate properly.

Note 3. Red/Blue Drive Adjustments in Service Menu NO.
55 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. 18 RD and 20 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 4. Red/Green/Blue Bias Adjustments in Service
Menu NO. 56: 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. 15 RB, No. 16 GB, and No. 17 BB automatically.

BIT FUNCTION

DATA

01

0, 1 TV/HOTEL/MONITOR NOT USED
2 VIDEO INPUT NONE YES
3, 4 CLOCK NOT USED
5 STEREO/MONO NOT USED
6, 7 SURROUND NOT USED

BIT FUNCTION

DATA

01
0 V–GUIDE YES NONE
1 COLOR ENHANCER NOT USED
2 INITIAL CHANNEL NOT USED
3 NOT USED NOT USED
4 PIP NOT USED
5 AV1/AV1, AV2 NOT USED
6 TONE/BASS, TREBLE NOT USED
7 GAME KEY NONE YES

SERVICE AD JUSTMENTS (Continued)

— 6 —

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 135V and – lead to ground
(TE7). Connect receiver to AC 120V line. Tune receiver to an
active channel. Reset the picture controls to the AUTO
level. Voltage must measure between +133.0V and +137.0V.
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
(120V AC line).

4. While pressing the MENU key, reconnect the AC power
cord. The Service Menu display will now appear.

5. Select NO. 3 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
(120V AC line).

4. While pressing the MENU key, reconnect the AC power
cord. The Service Menu display will now appear.

5. Select NO. 4 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. Che ck that picture is in the center of TV screen. If picture
center is too low, change resistor R513 (3.9K ohm, 1/6W) to a
470 ohm, 1W. If picture center is too high, add resistor R512
(470 ohm, 1W).

GRA Y SCALE ADJUS TMENT

1. Set the picture controls to the Auto levels (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. 15 RB (Red Bias), NO. 16 GB (Green Bias),
and NO. 17 BB (Blue Bias) with ▲ or ▼ key and set each
data to 0 with + or – key.

5. Select NO. 18 RD (Red Drive) and NO. 20 BD (Blue Drive)
with ▲ or ▼ key and set each data to 40 with + or – key.

6. Set NO. 19 GD (Green Drive Reduction) data to 08, NO. 47
SB (Sub Brightness) data to 20, NO. 48 SCO (Sub Color)
data to 07, NO. 49 STI (Sub Tint) to 14, and NO. 50 SSH (Sub
Sharpness) data to 0C with ▲or ▼, and + or – keys.

7. Turn Screen Control (T402) to minimum (fully counter­clockwise).

8. Select the Service Menu NO. 56 (Bias Adjustments) 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 4.)

11. Select the Service Menu NO. 55 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 5.)

13. Check for proper grayscale at all brightness levels.
To turn off the Service Menu display, press the MENU key.

Note: If Gr ayscale Adjustment is made after picture tube

replacement, check Brightness Level Adjustment.

FOCUS ADJUSTMENT

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

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

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 4. Remote Control Number keys’ functions in

Service Menu NO. 56

1

2

3

4 5 6

7 98

RD(–)

RD(+)

BD(–)

BD(+)

(N/A)

(N/A)

(N/A)

(N/A)

(N/A)

Figure 5. Remote Control Number keys’ functions in

Service Menu NO. 55 DRV

FOR RED DRIVE ADJUSTMENT

FOR BLUE DRIVE ADJUSTMENT

4A 125V

— 7 —

VCO AD JUSTMENT

Note: VCO must be adjusted after IC101 (Signal

Processor), IC802 (EEPROM) or T151 (VCO Coil) is
replaced.

1. Tune receiver to an active channel.

2. Set the picture controls to the Auto level.

3. Connect digital voltmeter + lead to pin 58 of IC101 and
– lead to ground (TE 7).

4. Confirm a reading of 3.6 ± 0.2 VDC.

5. If voltage is out of specifications adjust T151 for

3.6 ± 0.2 VDC.

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. 42 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.

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
(120V AC line).

6. While pressing the MENU key, reconnect the AC power
cord. The Service Menu display will now appear.

7. Select NO. 47 SB (Sub Brightness) with ▲ or ▼ key.

8. Adjust the data with + or – key for 600 mVDC.

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.

HIGH VOL T AGE 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 to active
channel. Reset the picture controls to the Auto levels.

2. Check that the voltage measured between TP7 and TE7
(ground side) is within 15.6 VDC to 19.2 VDC. If the volt­age is out of this range, the Hold-Down Circuit must be
checked.

3. Connect a DC Voltage supply to TP7 and TE7 through a
100 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. This
reaction indicates that the Hold-Down circuit is function­ing properly. If the receiver does not shutdown, a
malfunction is indicated and its cause must be found and
corrected.

4. To obtain picture again, remove the DC Supply and wait
a few minutes. Now turn on the receiver.

HIGH VOL T AGE CHECK

Note: +B (+135V) 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 20.0 KV and 22.0 KV. If
reading is not within range, check horizontal circuit.

No high voltage adjustment is provided on this chassis.

— 8 —

SERVICE AD JUSTMENTS (Continued)

VIDEO LEVEL

1. Connect color-bar generator to antenna terminals.

2. Switch the generator to a white field (100 IRE).

3. Set the picture controls to the Auto levels.

4. Connect oscilloscope + lead to terminal TP16 and
– lead to ground.

5. Turn off the receiver and disconnect the AC power cord
(AC 120V line).

6. While pressing the Menu key, reconnect the AC power
cord. The Service Menu will now appear.

7. Select NO. 46 VL (Video Level) with the ▲ or ▼ key.

8. Adjust the data with the + or – key for an oscilloscope
reading of 1.0 ± 0.1 VP-P at TP16.

9 Press the MENU key to turn off the Service Menu display

and disconnect oscilloscope from chassis.

SOUND ADJUSTMENT

1. Connect a color-bar generator to the antenna terminals
with audio signal of 1KHz at 100% modulation.

2. Set the picture controls to the Auto levels.

3. Connect oscilloscope + lead to TP21 (pin 75 of IC101 or
C132) and – lead to ground.

4. Turn off the receiver and disconnect the AC power cord
(AC 120V line).

5. While pressing the Menu key, reconnect the AC power
cord. The Service Menu will now appear.

6. Select NO. 45 FL (FM Level) with the ▲ or ▼ key.

7. Adjust the data with the + or – key for an oscilloscope
reading of 0.72 ± 10% VP-P at TP21.

8. Press the MENU key to turn off the Service Menu display
and disconnect the oscilloscope from the chassis.

Figure 6.

Figure 7.

1.0 ± 0.1 VP-P

0.72 ± 10% VP-P

— 9 —

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 in
the 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 the
unit off in 1.5 seconds to prevent unnecessary 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 the
power within 3 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 3 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 times

within 15 minutes, the CPU will automatically stop functioning to help prevent secondary damage. (TV will not turn on
by pressing the power key.) To reset the operating programs within the CPU, disconnect the AC power cord for at least
10 seconds.

TJ6 5V
D429 Cathode 9.4V
D802 Cathode 15.0V

— 10 —

Figure 3. Adjusting Magnet

Figure 2. Purity and Convergence Magnets

PURITY ADJUS TMENTS

1. When replacing picture tube or deflection yoke, mount
deflection yoke and purity and convergence magnets
assembly properly. See Figure 1. Position the picture
tube facing east or west. Demagnetize the picture tube
and receiver using an external degaussing coil. Set
receiver to Service Menu NO. 56 (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 back­ward on the neck until a uniform white field is obtained.

5. Allow 30 minutes warm up on a blank white field (high
intensity grayscale).
Note: If white field cannot be obtained check Grayscale
Adjustments on page 6.

6. Reset the picture controls to the Auto levels. Select a green
raster, either with the signal generator or by adjusting the
bias controls. If a signal generator is used for this step skip
to Step 11. If the bias controls will be used go to step 7.

7. Adjust Service Menu NO. 15 RB (Red Bias), NO. 16 GB
(Green Bias), and NO. 17 BB (Blue Bias) data each to 0.

8. Select Service Menu NO. 56 (no vertical sweep).

9. Adjust the Screen Control counterclockwise until the
horizontal scan line is no longer visible.

10. Select Service Menu NO. 16 GB (Green Bias) and
increase the data to produce a green raster. If retrace
lines 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 not
rotate tabs. See Figure 3.

13. Slowly slide the deflection yoke forward until a uniform
green screen is obtained.

14. Check the purity of the red and blue screens for unifor­mity. Turn off other colors to check (use bias controls or
use generator). If necessary, readjust the yoke position
until all screens are pure.

15. If bias controls and screen control were used to set puri­ty reset Grayscale and Bright Level. Refer to Grayscale
Adjustment on page 6 and Brightness Level Adustment
on page 7.

16. Confirm that the yoke is not tilted. Tighten the yoke
mounting screw. Adjust convergence next.

Figure 1. Deflection Yoke Movement

PURITY AND CONVERGENCE AD JUSTMENTS

CAUTION: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.

DEFLECTION YOKE

DEFLECTION YOKE
MOUNTING SCREW

PURITY
MAGNET
TABS

SIX-POLE
MAGNET TABS

4

3

1

2

ANGLE OF MAGNET TABS

RUBBER
WEDGE

FOUR-POLE
MAGNET TABS

ANGLE
OF TABS

FOCUS GAP
(G3-G4)

MAGNET TABS

— 11 —

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 ver­tical lines in the center area of the picture screen. See
Figure 4.

4. Keeping the tabs at the same angle, rotate them together
to superimpose the blue and red horizontal lines in the
center area of the picture screen. See Figure 4.

5. Adjust the six-pole magnet tabs 3 and 4 so the con­verged red/blue line is superimposed on the green line.
This is the same procedure used in steps 3 and 4. See
Figure 5.

CONVERGENCE ADJUS TMENT

Figure 4. Blue and Red Line Movement

Figure 7. Side of Yoke Movement

OUTER AREA CONVERGENCE AD JUSTMENT

The outer area convergence is performed by positioning of
the yoke as follows:

1. Move the top of the yoke toward or away from the pic­ture tube. This movement will affect the vertical lines at
the 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 positions
are 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 pic­ture tube to converge the horizontal lines at the top and
bottom and the vertical lines at the sides. See Figure 7.

4. Check that splits at 12 o’clock and 6 o’clock are mini­mized, adjust yoke for best compromise. Secure yoke
position with the side wedges. See Figure 1.

Note: When re-using the rubber wedges, apply a small

amount of silicone rubber adhesive or hot melt to
each of the wedges.

Figure 6. Top of Yoke Movement

Figure 5. Blue/Red and Green Line Movement

BLUE

BLUE

GREEN

RED

RED

Adjust four-pole tabs angle to
superimpose blue and red vertical
line.

Adjust four-pole tabs together
to superimpose red and blue
horizontal line.

BLUE / RED

GREEN

Adjust six-pole tabs angle to
superimpose red / blue and
green vertical line.

Adjust six-pole tabs together
to superimpose red / blue and
green horizontal line.

Line movement when adjusting
top of yoke in and out.

BLUE

GREEN

RED

Line movement when adjusting
side of yoke in and out.

BLUE

GREEN

GREEN

RED

RED

BLUE

BLUE

GREEN

RED

BLUE
GREEN
RED