SANYO CPP2930 Service Manual

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Except within Tuner and RC Pre-Amp.

Cabinet Dimensions

Width. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 356mm

Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . 327mm

Depth. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 372mm

REFERENCE No. SM780087

DS13330, G8PAM, PRODUCT CODE 111363780

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

DS13330 (U.S.A.)

(CANADA)

ORIGINAL VERSION

Chassis No. 13330-01

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.

VIDEO IN L-AUDIO-R

— 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. To enter the Service Menu, first disconnect the AC power cord. Then while pressing the MENU key on the front control panel, reconnect the AC power cord. The adjustments can now be made with the remote control or front control panel keys.

ON-SCREEN SERVICE MENU SYSTEM

1. Enter the Service Menu:

• While pressing the MENU key on the front control panel, reconnect the AC

power cord. The Service Menu Display will now appear. (See Figure 1.)

2. Service Adjustments:

• Press the ▲or ▼ key to select the desired service menu item you want to

adjust. (See page 4 for On-screen Service Menu.)

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

The + or – keys will increase or decrease the data sequentially. The number keys (0 ~ 7) toggle only their respective bits between 1and 0.

3. Exit from the Service Menu:

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

SERVICE AD JUSTMENTS

— 3 —

IC802 (EEPROM) REPLACEMENT

When IC802 (EEPROM) is replaced, IC801 (CPU) will automatically write the initial reference data into IC802 for basic TV operation. However, the bus data should be checked and some bus data should be set up before attempting the service adjustments. (See pages 4 – 5 for detailed information.)

INITIAL BUS DATA SETUP

Note:When IC802 (EEPROM) is replaced, change the following initial reference data for proper TV operation before

attempting the service adjustments.

1. Disconnect the AC power cord (AC 120V line).

2. While pressing the MENU key on the front control panel, reconnect the AC power cord. The Service Menu display will now appear.

3. Select No. 3C SCO (Sub Color) with ▲ or ▼ key. Adjust the data with + or – key for 1D (hex).

4. Select No. 3D STI (Sub Tint) with ▲ or ▼ key. Adjust the data with + or – key for 08 (hex).

5. Select No. 3F SSH (Sub Sharpness) with ▲ or ▼ key. Adjust the data with + or – key for 05 (hex).

6. Select No. 41 HBS7HP (H Blanking / H Phase) with ▲ or ▼ key. Adjust the data with + or – key for 10 (hex).

7. Select No. 42 VS (V Size) with ▲ or ▼ key. Adjust the data with + or – key for 45 (hex).

8. Select No. 43 VSP7VPO (V Sync Sep / V Position) with ▲ or ▼ key. Adjust the data with + or – key for 0F (hex).

9. Select No. 44 GRY7CRS5VLN (Gray / Cross B/W / V Lin) with ▲ or ▼ key. Adjust the data with + or – key for 92 (hex).

10. Select No. 45 HBL5VSC with ▲ or ▼ key. Adjust the data with + or – key for EA (hex).

11. Select No. 46 VC3CDM (V Size Comp / V Count Down), with ▲ or ▼ key. Adjust the data with + or – key for 38 (hex).

12. Select No. 4B BGS5RGD4GD (Bγ / RGγ / G Drive) with ▲ or ▼ key. Adjust the data with + or – key for 0B (hex).

13. Select No. 4D SBI (Sub Bias) with ▲ or ▼ key. Adjust the data with + or – key for 40 (hex).

14. Select No. 56 FBP6WP4PRE2CRG (FBP Blanking / White Peak / Pre shoot / Coring Gain) with ▲ or ▼ key. Adjust the data with + or – key for 42 (hex).

15. Select No. 57 DCR4BSS2BSG (DC Reset / Black Stretch Start / Black Stretch Gain) with ▲ or ▼ key. Adjust the data with + or – key for 02 (hex).

16. Select No. 58 AFC7CBP5 (Auto Flesh / Color BPF Bypass) with ▲ or ▼ key. Adjust the data with + or – key for 80 (hex).

17. Select No. 60 HBL5 (H Blanking Left) with ▲ or ▼ key. Adjust the data with + or – key for 00 (hex).

18. Select No. 83 OPT (AV Option) with ▲ or ▼ key. Adjust the data with + or – key for 84 (hex).

19. Select No. 8D HR (H Display Position) with ▲ or ▼ key. Adjust the data with + or – key for 10 (hex).

20. Select No. 8E SBO (Sub Bright Offset) with ▲ or ▼ key. Adjust the data with + or – key for 00 (hex).

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

3C SCO 0A 00001010

Figure 1. Service Menu Display

ITEM NO.

TITLE

BINARY DATA (8 bit)

HEX 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 INITIAL SETUP

FUNCTION

DATA HEX DATA HEX DATA BINARY

3C SCO 0A 1D* 00011101 Sub Color

3D STI 05 08* 00001000 Sub Tint

3E SB 20 20 00010000 Sub Bright 3F SSH 12 05* 00000101 Sub Sharpness 40 AFC6HFR 9E 9E 10011110 AFC / Horizontal Frequency 41 HBS7HP 0F 10* 00010000 Horizontal Blanking / Horizontal Phase 42 VS 32 45* 01000101 Vertical Size 43 VSP7VPO 05 0F* 00001111 Vertical Sync Separator / Vertical Position 44 GRY7CRS5VLN 8E 92* 10010010 Gray Mode / Cross Black/White / Vertical Linearity 45 HBL5VSC EC EA* 11101010 Horizontal Blanking Right / Vertical S Correction 46 VC3CDM 28 38* 00111000 Vertical Compression / Vertical Count Down 47 RB 00 00 00000000 Red Bias 48 GB 00 00 00000000 Green Bias 49 BB 00 00 00000000 Blue Bias 4A RD 40 40 01000000 Red Drive 4B BGS5RGD4GD 08 0B* 00001011 Blue Gamma / Red-Green Gamma / Green Drive Reduction 4C BD 40 40 01000000 Blue Drive

4D SBI 20 40* 01000000 Sub Bias

4E ↓↓↓↓Not Used 4F ↓↓↓↓Not Used 50 OSD 01 01 00000001 On Screen Display Contrast 51 BSD7CR6 40 40 01000000 Black Stretch / Coring 52 ↓↓↓↓Not Used 53 ↓↓↓↓Not Used 54 FLS 01 01 00000001 Y/C Filter Mode 55 GYA3CKO 02 02 00000010 G-Y Angle / Color Killer Operation 56 FBP6WP4PRE2CRG 4A 42* 01000010 FBP Blanking / W Peak Limit / Preshoot Adj / Coring Gain 57 DCR4BSS2BSG 08 02* 00000010 DC Reset / Black Stretch Start / Black Stretch Gain 58 AFC7CBP5 00 80* 10000000 Auto Flesh / Color Band Pass Filter 59 DIG6ABL5MSD4BAT 04 04 00000100 OSD D/A / ABL Defeat / Mid Stop / ABL Threshold 5A RYA 02 02 00000010 R-Y/B-Y Angle 5B ↓↓↓↓Not Used 5C ↓↓↓↓Not Used

5D RAD 0F 0F 00001111 RF AGC Delay

5E FMM7IAS 00 00 00000000 FM Mute / IF AGC 5F VL5FL 67 67 01100111 Video Level / FM Level 60 HBL5 E0 00* 00000000 Horizontal Blanking Left 83 OPT 04 84* 10000100 AV Option (See Note 3) 84 OP2 00 00 00000000 Game / V-Guide Option (See Note 4)

8D HR 13 10* 00010000 Horizontal Display Position

8E SBO 03 00* 00000000 Sub Bright Offset

8F DRV

R40 R40 01000000 Red Drive Adjustment (See Note 1.) B40 B40 01000000 Blue Drive Adjustment (See Note 1.)

– - - - Red Bias Adjustment (See Note 2.)

90 – - - - Green Bias Adjustment (See Note 2.)

– - - Blue Bias Adjustment (See Note 2.)

B0 ↓↓↓↓Not Used

↓↓ ↓ ↓ ↓↓

F8 ↓↓↓↓Not Used

— 5 —

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 3. Option Data (NO. 83 OPT) should be set to hexadecimal 84.

See page 3 INITIAL DATA SETUP step 18 for set up procedure. If this program code is wrong the TV will not operate properly.

Note 4. Option Data (NO. 84 OP2) should be set to hexadecimal 00.

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

Note 1. Red/Blue Drive Adjustments in Service Menu NO. 8F DRV:

Adjust Red and Blue Drive Levels alternately with 1, 3, 7, and 9 keys on the remote control. (See Figure 1.) The Drive Level adjustment data will be written in the Service Menu No. 4A RD and 4C BD automatically.

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 1.

Figure 2.

4 5 6

7 98

RD(–)

RD(+)

BD(–)

BD(+)

(N/A)

FOR RED DRIVE ADJUSTMENT

FOR BLUE DRIVE ADJUSTMENT

Note 2. Red/Green/Blue Bias Adjustments in Service Menu NO. 90:

Adjust each Bias Level with 1, 3, 4, 6, 7, or 9 key on the remote control. (See Figure 2.) The Bias Level adjustment data will be written in the Service Menu No. 47 RB, No. 48 GB, and No. 49 BB automatically.

BIT FUNCTION

DATA

0, 1 NOT USED – –

2 AV FUNCTION NO AV AV

3 ~ 7 NOT USED

DRIVE AND BIAS ADJUS TMENTS

BIT FUNCTION

DATA

0 V–GUIDE YES NO 1 ~ 7 NOT USED – – 8 GAME MODE NO 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. 41 HPS7HP (Horiz. 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. 42 VS (Vertical Size) with ▲ or ▼ key.

6. Adjust the data with + or – key for full scan. To turn off the Service Menu display, press the MENU key.

VERTICAL CENTERING ADJUSTMENT

1. Tune receiver to an active channel.

2. C heck that picture is in the center of TV screen. If picture center is too low, add resistor R513 (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. 47 RB (Red Bias), NO. 48 GB (Green Bias), and NO. 49 BB (Blue Bias) with ▲ or ▼ key and set each data to 00 with + or – key.

5. Select NO. 4A RD (Red Drive) and NO. 4C BD (Blue Drive) with ▲ or ▼ key and set each data to 40 with + or – key.

6. Set NO. 3C SCO (Sub Color) data to 1D, NO. 3D STI (Sub Tint) to 08, NO. 3E SB (Sub Brightness) data to 20, NO. 3F SSH (Sub Sharpness) data to 05, and NO. 4B GD (Green Drive Reduction) data to 0B with ▲ or ▼, and + or – keys.

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

8. Select the Service Menu NO. 90 (Bias Adjustments – No Vertical Sweep) with ▲ or ▼ key.

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

10. Raise each Bias Level with 3, 6, and 9 keys to obtain just visible white line. (See Figure 4.)

11. Select the Service Menu NO. 8F 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 G rayscale 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.

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. 90

4 5 6

7 98

RD(–)

RD(+)

BD(–)

BD(+)

(N/A)

Figure 5. Remote Control Number keys’ functions in

Service Menu NO. 8F 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 (TP 10) 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. 5D 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. 3E 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.

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 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 19.8 KV and 22.5 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. 5F VL5FL (Video Level) with the ▲ or ▼ key.

8. Adjust the data with the 5, 6, and 7 number keys 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. 5F VL5FL (FM Level) with the ▲ or ▼ key.

7. Adjust the data with the + or – key for an oscilloscope reading of 0.95 ± 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

0.95 ± 10% VP-P

+ 18 hidden pages