Sanyo DS19500 Schematic

Specifications

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

58W (Avg), 1.4A (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. . . . . . . . . . . . . . . . . . A48KRD82X(DT)

Semiconductors

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

Transistors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Except within Tuner and RC Pre-Amp.

Cabinet Dimensions

Width. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 488mm

Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . 452mm

Depth. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 468mm

REFERENCE No. SM5110088-07

DS19500, G8FLM, PRODUCT CODE 111350180

AS

FILE NO.

SM5110088

REF : No.

COLOR TELEVISION

Notice

CORRECTION
SERVICE FLASH

PRODUCTION CHANGE
ADD INFORMATION

Please add this notice to the Service Manual listed below.

REVISION 07

Category :

DS19500

Model:

U.S.A. / CANADA

Destination:

MAY / 15 / 2002

Date:

19500-07

Effective from : Chassis No.

NOTE: Match the Chassis No. on the unit’s back cover with the Chassis No. in the Service Manual.

If the Service Manual Chassis No. does not match the unit’s, additional Service Literature is

required. This chassis is similar to Chassis No. 19500-00, however, all Service Information is
given in this Notice for Chassis No. 19500-07 used in Model DS19500.

Contents

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

Service Adjustments. . . . . . . . . . . . . . 3 - 9

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

Service Hints. . . . . . . . . . . . . . . . . . . . . . 12

Mechanical Disassemblies. . . . . . . . . . . 13

Chassis Electrical Parts List . . . . . . 14 - 20

Cabinet Parts List . . . . . . . . . . . . . . . . . . 21

Component and Test Point

Locations . . . . . . . . . . . . . . . . . . . 22 - 24

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

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

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

Capacitor and Resistor Codes . . . . . . 25

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

Voltage Charts . . . . . . . . . . . . . . . 26 - 28

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

Schematic Diagram . . . . . . . . . . . 29 - 32

— 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.

— 3 —

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 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

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 – 6 for detailed information.)

INITIAL BUS DATA SETUP

Note: When IC802 (EEPROM) is replaced, the Service Menu NO. 23 POS (Pre Over SW), NO. 28 PRE (Preshoot Adj),

NO. 37 AF (Auto Flesh), NO. 54 SCO (Sub Color), NO. 55 STI (Sub Tint), NO. 57 OPT (SA Option ), and NO. 59
HR (OSD Position) should be set up for proper TV operation before attempting the 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. 23 POS (Preshoot Overshoot Switch) with ▲ or ▼ key. Adjust the data with + or – key for 1.

4. Select NO. 28 PRE (Preshoot Adj) with ▲ or ▼ key. Adjust the data with + or – key for 2.

5. Select NO. 37 AF (Auto Flesh) with ▲ or ▼ key. Adjust the data with + or – key for 1.

6. Select NO. 54 SCO (Sub Color) with ▲ or ▼ key. Adjust the data with + or – key for 10.

7. Select NO. 55 STI (Sub Tint) with ▲ or ▼ key. Adjust the data with + or – key for 22.

8. Select NO. 57 OPT (SA Option ) with ▲ or ▼ key. Adjust the data with + or – key for 100.

9. Select NO. 59 HR (OSD Position) with ▲ or ▼ key. Adjust the data with + or – key for 24.

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

NO. DATA
XX OPT XXX XXXXXXXX

Figure 1. Service Menu Display

ITEM NO.

TITLE

BINARY DATA
(8 bit)

DECIMAL DATA

— 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
01 HFR 29 29 0~63 Horizontal Frequency
02 AFC 0 0 0, 1 AFC Gain & Gate
03 HP 15 15 0~31 Horizontal Phase (Horizontal Centering)
04 VS 64 64 0~127 Vertical Size
05 VPO 5 5 0~63 Vertical Position
06 VSP 0 0 0, 1 Vertical Set Up (Sync Sensitivity)
07 VLN 18 18 0~31 Vertical Linearity
08 CRS 0 0 0~3 Cross B/W
09 GRY 1 1 0, 1 Gray Mode
10 VSC 8 8 0~31 Vertical S Correction
11 HBR 3 3 0~7 H BLK R
12 HBL 4 4 0~7 H BLK L
13 CDM 0 0 0, 1 C D Mode
14 VC 7 7 0~7 Vertical Compression
15 RB 0 0 0~255 Red Bias
16 GB 0 0 0~255 Green Bias
17 BB 0 0 0~255 Blue Bias
18 RD 64 64 0~127 Red Drive
19 GD 8 8 0~15 Green Drive
20 BD 64 64 0~127 Blue Drive
21 SBI 48 48 0~127 Sub Bias
22 OSD 3 3 0~3 OSD Contrast
23 POS 0 1* 0, 1 Pre/Over SW
24 FLS 1 1 0~7 Filter System
25 CKO 3 3 0~7 Color Killer Operation
26 GYA 0 0 0, 1 G-Y Angle
27 CRG 2 2 0~3 Coring Gain
28 PRE 1 2* 0~3 Pre Shoot Adjust
29 WP 1 1 0, 1 White Peak Limiter
30 FSW 0 0 0, 1 FBP Blanking Switch
31 VBL 0 0 0, 1 Vertical Blanking Switch
32 BSG 2 2 0~3 Black Str Gain
33 BSS 1 1 0~3 Black Str Start
34 DCR 1 1 0~3 DC Reset
35 YGM 1 1 0~3 Y Gamma
36 CBP 0 0 0, 1 C Bypass
37 AF 0 1* 0, 1 Auto Flesh
38 BAT 4 4 0~7 Bright ABL Threshold
39 MSD 0 0 0, 1 Mid Stop Def
40 ABL 0 0 0, 1 Auto Bright Limit
41 RYA 2 2 0~15 R-Y/B-Y Angle
42 RAD 15 15 0~63 RF AGC Delay
43 IAS 0 0 0, 1 IF AGC
44 FMM 0 0 0, 1 FM Mute
45 FL 15 15 0~31 FM Level

— 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.)

NO. TITLE

INITIAL REFERENCE INITIAL SETUP

RANGE OF DATA FUNCTION

DATA DATA
46 VL 4 4 0~7 Video Level
47 EWD 39 39 0~63 EW DC
48 EWA 30 30 0~63 EW Amp
49 EWT 34 34 0~63 EW Tilt
50 EWP 7 7 0~7 EW Corner Top
51 EWB 8 8 EW Corner Bottom
52 HSC 7 7 Horizontal Size Comp
53 SB 32 32 0~63 Sub Bright
54 SCO 7 10* 0~31 Sub Color
55 STI 20 22* 0~31 Sub Tint
56 SSH 12 12 0~31 Sub Sharpness
57 OPT 0 100* 0~255 Option (See Note 1 page 6.)
58 OP2 0 0 0~255 Option 2 (See Note 2 page 6.)
59 HR 27 24* 0~63 OSD Horizontal Position
60 ATT 7 7 0~63 Input Level
61 WDB 32 32 0~63 Wideband
62 SPC 32 32 0~63 Spectral
63 SBO 5 5 0~255 Sub Bright Offset
64 PCO 40 40 0~63 PIP Color
65 PTI 40 40 0~63 PIP Tint
66 PUV 24 24 0~63 PIP Top Position
67 PDV 147 147 0~255 PIP Bottom Position
68 PLH 10 10 0~63 PIP Left Position
69 PRH 101 101 0~255 PIP Right Position
70 PCN 42 42 0~63 PIP Y Level
71 PBS 15 15 0~63 PIP BGP Phase

72 DRV

64 64 0~127 Red Drive Adjustment (See Note 3 page 6.)
64 64 0~127 Blue Drive Adjustment (See Note 3 page 6.)

– 0 0 0~255 Red Bias Adjustment (See Note 4 page 6.)

73 – 0 0 0~255 Green Bias Adjustment (See Note 4 page 6.)

– 0 0 0~255 Blue Bias Adjustment (See Note 4 page 6.)

— 6 —

SERVICE AD JUSTMENTS (Continued)

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. 57 OPT) should be decimal 100
(01100100 binary). See page 3 INITIAL DATA SETUP, step

9, for set up procedure. If this program code is wrong the
TV will not operate properly.

Note 2. Option Data 2 (NO. 58 OP2) should be decimal 0
(00000000 binary). See page 3 INITIAL DATA SETUP, step

10, for set up procedure. If this program code is wrong the
TV will not operate properly.

DRIVE / BIAS ADJUSTMENTS

Note 3. Red/Blue Drive Adjustments in Service Menu NO.
72 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 and 20 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. 73: 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 ~ 17
automatically.

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 AV1 AV1, AV2
6 TONE/BASS, TREBLE NOT USED
7 GAME KEY NONE YES

BIT FUNCTION

DATA

01

TV 00: TV

0, 1 HOTEL 01: HOTEL

MONITOR 10: MONITOR

11: INHIBITED (=TV)
2 VIDEO INPUT NONE YES
3, 4 CLOCK NOT USED
5 STEREO/MONO MONO STEREO

00: NONE
6, 7 SURROUND 01: YES

10: NOT USED

11: NOT USED

— 7 —

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 FACTORY
PRESET levels (press remote control RESET key twice).
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.

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

5. Select NO. 03 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. 04 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. C he ck that picture is in the center of TV screen. If picture
center is too low, change resistor R513 from 1K ohm 1/2W to
470 ohm 1W. If picture center is too high, remove resistor
R513 (1K ohm, 1/2W).

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 Sports 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.

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 (Q202 emitter) and ground.

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

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

6. Adjust the + or – key 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.

4A 125V

— 8 —

SERVICE AD JUSTMENTS (Continued)

GRA Y SCALE ADJUS TMENT

1. Set the picture controls to the Sports 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. 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 64 with + or – key.

6. Set NO. 19 GD (Green Drive Reduction) data to 8, NO. 53
SB (Sub Brightness) data to 32, NO. 54 SCO (Sub Color)
data to 10, NO. 55 STI (Sub-Tint) to 22, and NO. 56 SSH
(Sub Sharpness) data to 12 with ▲ or ▼, and + or – keys.

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

8. Select the Service Menu NO. 73 (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 5.)

11. Select the Service Menu NO. 72 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.

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 Sports 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. 53 SB (Sub Brightness) with ▲ or ▼ key.

8. Adjust the data with + or – key for 820mVDC.

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 Sports levels.

2. Check that the voltage measured between TP7 and TE7

(ground side) is within 16.5 VDC to 21 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 25.0 KV and 27.0 KV. If

reading is not within range, check horizontal circuit.

No high voltage adjustment is provided on this chassis.

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. 73

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. 72 DRV

FOR RED DRIVE ADJUSTMENT

FOR BLUE DRIVE ADJUSTMENT

— 9 —

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 Sports levels

3. Connect oscilloscope + lead to TP21 (base Q135) 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 0.693 ± 10% VP-P at TP21.

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

MULTI-SOUND SECTION ADJUSTMENTS

Note: Multi-Sound Section must be adjusted after

IC101 (Signal Processor), IC3401 (MTS Decoder), or
IC802 (EEPROM) is replaced.

INPUT LEVEL ADJUSTMENT

1. Connect a signal to the antenna terminals with audio of
1 KHZ100% 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. 60 ATT (Attenuation) with the ▲ or ▼ key.

6. Adjust the + or – key for a voltmeter reading of 400 ± 20
mVrms at TP317.

SEP ARA TION AD JUSTMENT

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

8. Connect oscilloscope CH1 to TP317 and CH2 to TP318
and 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. 61 WDB (Wideband) with the ▲ or ▼ key.

13. Adjust the + or – key for minimum low frequencies at
TP317. (See Figure 8.)

14. Select 4 KHz audio frequency and Right modulating signal.

15. Select NO. 62 SPC (Spectral) with the ▲ or ▼ key.

16. Adjust the + or – key for minimum high frequencies at
TP318. (See Figure 8.)

Repeat adjustments (steps 11–16) until no further decreases
in amplitude can be obtained. Press the MENU key to turn
off the Service Menu display.

Figure 8. Separation Adjustments

0.693 ± 10% VP-P

Figure 7.

Minimize L leakage

TP317 (R)

300Hz

Minimize R leakage

TP318 (L)

4KHz

— 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. 73 (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 8.

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. 73 (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 and Brightness Level Adustment on page 8.

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

Figure 1. Deflection Yoke Movement

PURITY AND CONVERGENCE ADJUSTMENTS

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 ADJUSTMENT

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

— 12 —

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 5V

— 13 —

MECHANICAL DISASSEMBLIES

CABINET BACK REMOVAL

1. Refer to Figure 1, remove 5 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
dag coating (picture tube grounding lead).

3.Disconnect degaussing coil socket (KD), picture tube
socket, deflection yoke connector (KX), speaker
connector (KSP), picture tube ground lead, and 2nd
anode lead.

4. Remove chassis completely by sliding it straight back.

Figure 1. Cabinet Back Removal

PICTURE TUBE REMOV AL

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, referring to 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 tube
grounding lead on the picture tube. See Figure 2.

Note: If Picture Tube is being replaced, mount the Degaussing

Coil properly on the tube. See Figure 2.

Figure 2. Picture Tube Removal

AUDIO

OUTPUT

UHF/VHF/CATV

75Ω

L

R

TO PICTURE TUBE
SOCKET BOARD
GROUND

DEGAUSSING
COIL SOCKET

DEGAUSSING
COIL

PICTURE-TUBE
GROUNDING LEAD

DEGAUSSING
COIL HOLDER

DEGAUSSING
COIL HOLDER

— 14 —

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 FR OM RESIS TANCE,W ATTAGE,AND VOLTAGE RATINGS MAY BE MADE
FOR REPLACEMENT ITEMS DESIGNATED BY A STAR.

Schematic
Location

Part No.

Description

Schematic
Location

Part 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 Voltage
Tolerance Symbols:
less than 10PF
A . .Not specified
B . .±0.1PF C . .±0.25PF
D . .±0.5PF F . .±1PF
G . .±2PF R . .+0.25 - 0PF
S . .+0 - 0.25PF E . .+0 - 1PF
more than 10PF
A . .Not specified
B . .±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%

Rated Value: P...Pico Farad U...Micro Farad
Material:

CERAMIC . . . . . .Ceramic

MT-PAPER . . . . .Metalized Paper

POLYESTER . . .Polyester
MT-POLYEST . .Metalized Polyester

POLYPRO . . . . .Polypropylene

MT-POLYPRO . .Metalized Polypropylene
COMPO-FILM . .Composite Film

MT-COMPO . . . .Metalized Composite

STYRENE . . . . . .Styrene

TA-SOLID . . . . .Tantalum Solid

AL-SOLID . . . . . .Aluminum Solid

ELECT . . . . . . . .Electrolytic

NP-ELECT . . . . .Non-Polarized Electrolytic

OS-SOLID . . . . .Aluminum Solid with Organic

Semiconductive Electrolytic

C001 404 087 2801 ELECT 0.22 M 50V
C002 404 087 2801 ELECT 0.22 M 50V
C003 403 235 5701 CERAMIC 5600P K 50V
C004 403 235 5701 CERAMIC 5600P K 50V
C006 403 224 6108 CERAMIC 0.01U K 50V
C010 404 087 2306 ELECT 220U M 25V
C011 404 087 2306 ELECT 220U M 25V
C012 404 088 5702 ELECT 22U M 16V
C015 404 084 3108 ELECT 330U M 16V
C101 404 084 2408 ELECT 470U M 6.3V
C103 403 224 6108 CERAMIC 0.01U K 50V
C106 404 084 4006 ELECT 2.2U M 50V
C131 404 084 3801 ELECT 1U M 50V
C133 403 224 6108 CERAMIC 0.01U K 50V
C134 403 224 5705 CERAMIC 1000P K 50V
C136 401 150 6001 MT-GLAZE 0.000 ZA 1/10W
C137 403 364 7508 CERAMIC 10P J 50V
C141 403 224 6108 CERAMIC 0.01U K 50V
C142 403 343 4603 CERAMIC 0.022U K 50V
C143 403 224 6108 CERAMIC 0.01U K 50V
C146 403 224 6108 CERAMIC 0.01U K 50V
C147 404 084 2200 ELECT 100U M 6.3V
C151 404 084 3702 ELECT 0 .47U M 50V
C153 404 084 3702 ELECT 0 .47U M 50V
C161 403 357 9601 CERAMIC 0.1U Z 50V
C211 404 084 6901 NP-ELECT 1U M 50V
C212 404 084 4006 ELECT 2.2U M 50V
C221 404 084 6901 NP-ELECT 1U M 50V
C251 401 150 6001 MT-GLAZE 0.000 ZA 1/10W
C252 404 086 6602 POLYESTER 0.047U K 63V
C253 404 084 3702 ELECT 0.47U M 50V
C256 404 084 3801 ELECT 1U M 50V
C257 403 224 6108 CERAMIC 0.01U K 50V
C258 404 084 3207 ELECT 47U M 16V
C272 404 084 4105 ELECT 3.3U M 50V
C274 404 084 2705 ELECT 10U M 16V
C284 404 084 3207 ELECT 47U M 16V