Sanyo DS19330 User manual

AS
FILE NO.
SERVICE MANUAL
(SUPPLEMENT) Remote Control Color
Television DS19330 (U.S.A.)
(CANADA)
ORIGANALVERSION
Chassis No. 19330-00
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.
G8MDA, PRODUCT CODE 111363880 REFERENCE No. SS780042
THIS CHASSIS IS SIMILARTO MODEL DS19310, CHASSIS NUMBER
19310-04. SERVICE INFORMATION GIVEN INTHIS MANUAL IS ONLYTHE
DIFFERENCE INFORMATION FROM MODEL DS19310, CHASSIS
NUMBER 19310-04. FOR ADDITIONAL SERVICE INFORMATION, REFER
TOTHE SERVICE MANUAL FOR CHASSIS NUMBER 19310-04 USED IN
MODEL DS19310 (SM5110224-04).
AS
POWER
MENU
CH VOL
AUDIO IN
VIDEO IN

1 610 278 9713 CABINET FRONT ASSY 610 303 8988 CAB FRONT ASSY
4 610 289 2581 CABINET BACK 610 307 5297 CABINET BACK
6 610 289 3731 BUTTON UNIT 610 304 5245 BUTTON UNIT
7 610 289 5148 CAP RC 610 267 0851 CAP RC
610 289 8071 DEC SHEET N/A NOT USED
610 297 8810 OWNER’S MANUAL 610 304 4095 OWNER’S MANUAL
DIFFERENCES
MODEL DS19330 (Chassis No. 19330-00) SAME AS MODEL DS19310 (Chassis
No. 19310-04) EXCEPT:
1. INTHE CABINET / ACCESSORY PARTS LIST
MODEL DS19310 (Chassis No. 19310-04) MODEL DS19330 (Chassis No. 19330-00)
Part No. Description
KEY NO. Part No. Description
4
5
6
7
1
3
2
POWER
MENU
CH VOL
AUDIO IN
VIDEO IN
8
AS
April / 2003 / 2000 SMC Printed in U.S.A.
For parts or service contact
21605 Plummer Street
Chatsworth, CA 91311 (U.S.A.)
300 Applewood Crescent,
Concord, Ontario L4K 5C7 (CANADA)
SANYO FISHER SERVICE

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. . . . . . . . . . . . . . . . . . . . . . . . 7
Transistors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Except within Tuner and RC Pre-Amp.
Cabinet Dimensions
Width. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 488mm
Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . 452mm
Depth. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 467mm
REFERENCE No. SM5110224-04
DS19310, G8EHM, PRODUCT CODE 111355483
AS
FILE NO.
SM5110224
REF : No.
COLOR TELEVISION
Notice
CORRECTION
SERVICE FLASH
PRODUCTION CHANGE
ADD INFORMATION
Please add this notice to the Service Manual listed below. REVISION 04
Category :
DS19310
Model:
U.S.A. / CANADA
Destination:
MARCH / 15 / 2002
Date:
19310-04
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. 19310-00, however, all Service Information is
given in this Notice for Chassis No. 19310-04 used in Model DS19310.
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

— 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 ser-
vice is performed on the receiver.
2. Comply with all caution and safety-related notes provid-
ed on the side of the cabinet, inside the cabinet, on 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 ohm-
meter to the jumpered AC plug, and touch the other lead to
each exposed antenna terminal (UHF and VHF antenna ter-
minals). 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 volt-
meter, 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.
HIGHVOLTAGE HOLD-DOWNTEST
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 HOLD-
DOWN 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
0.15 µF 150V AC
1500 ohm
10 watt
Good earth ground
such as a water pipe,
conduit, etc.
AC OUTLET
TELEVISION
RECEIVER
READING SHOULD NOT EXCEED 750 mV.
AC VOLTMETER
(5000 ohms per volt or more sensitivity)
To be touched to all of exposed metal parts.
Voltmeter Hook-up for Leakage Current Check.

GENERAL
Thisset hasan On-screenServiceMenu systemincluded inthe CPUthat allows remote operation formost 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 ADJUSTMENTS
— 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. 7 VLN (V Linearity) No. 10 VSC (V S Cor.)
No. 21 SBI (Sub Bias), No. 32 BSG (Blk Stk Gain), No. 42 RAD (RF AGC Delay), No. 49 STI (Sub Tint), No. 50 SSH (Sub
Sharp), and No. 51 OPT (Option 1) should be set up for proper TV operation before attempting the service adjust-
ments.
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 50.
4. Select No. 7 VLN (V Linearity) with ▲or ▼key. Adjust the data with + or – key for 15.
5. Select No. 10 VSC (V S Correction) with ▲or ▼key. Adjust the data with + or – key for 0A.
6. Select No. 32 BSG (Blk Stk Gain) with ▲or ▼key. Adjust the data with + or – key for 02.
7. Select No. 42 RAD (RF AGC Delay) with ▲or ▼key. Adjust the data with + or – key for 20.
8. Select No. 49 STI (Sub Tint) with ▲or ▼ key. Adjust the data with + or – key for 17.
9. Select No. 51 OPT (Option 1 with ▲or ▼key. Adjust the data with + or – key for 04.
10. 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 50* 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 15* 00~1F Vertical Linearity
8 CRS 00 00 00~03 Cross B/W
9 GRY 01 01 00, 01 Grey Mode
10 VSC 08 0A* 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 30 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 03 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 0A 00~1F Sub Color
49 STI 16 17* 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 00 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 particu-
lar model, the Program Code must be correct.
Note 1. Option Data (NO. 51 OPT) should be set to hexa-
decimal 04. 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 (NO. 52 OPT2) should be set to hexa-
decimal 00. 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.
123
456
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.
123
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 ADJUSTMENTS (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).
+BVOLTAGE 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 CENTERINGADJUSTMENT
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 SIZEADJUSTMENT
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 CENTERINGADJUSTMENT
1. Tune receiver to an active channel.
2. Check that picture is in the center of TV screen. If picture
center is too low, change resistor R513 (3.9K ohm, 1/6W) to a
470 ohm, 1W. If picture center is too high, add resistor R512
(470 ohm, 1W).
GRAYSCALEADJUSTMENT
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 0A, NO. 49 STI (Sub Tint) to 17 and NO. 50 SSH (Sub
Sharpness) data to 0C with ▲or ▼, and + or – keys.
7. Turn Screen Control (T402) to minimum (fully counter-
clockwise).
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 Grayscale Adjustment is made after picture tube
replacement, check Brightness Level Adjustment.
FOCUSADJUSTMENT
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 PRO-
TECTION CONTRE LES RISQUES
D’ INCENDIE UTILISER UN FUSIBLE DE
RECHANGE DE MEME TYPE 4A, 125V.
4A 125V
123
456
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
123
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

— 7 —
VCOADJUSTMENT
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.
RFAGCADJUSTMENT
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 LEVELADJUSTMENT
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 820 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.
HIGHVOLTAGE HOLD-DOWNTEST
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 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 function-
ing 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.
HIGHVOLTAGE 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.

— 8 —
SERVICE ADJUSTMENTS (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.
SOUNDADJUSTMENT
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