Panasonic TX-G10 Schematic

TX-G10 Service Manual

Safety

Specifications

Parts List

Service

Information

Adjustments

Self Check

Service Hints

Mechanical

View

Disassembly

Location of

Controls

Waveforms

Block Diagrams

Schematic Diagrams

PCB Views

Service Support

Service and repair of this product is supported by Panasonic's LUCI interface.

This interface provides a link between the TV and a standard PC to allow a number of diagnostic and control functions to be performed.

For more details contact your local Panasonic company.

BACK

EXIT

Audio

Control

Power supply

BACK

E - PCB

Y - PCB

BACK

Video

Q - PCB

E - Schematic Q - Schematic

Y - Schematic

BACK

SPECIFICATIONS

Power Source: 220-240V a.c., 50Hz

12-24V d.c.

Power Consumption: 39W

ORDER No. SM-98042

Portable Colour Television

TX-G10

AC1 Chassis

AV2 IN Audio (RCAx1) 500mV rms10kΩ

Video (BNCx1) 1V p-p 75Ω

AV2 OUT Audio Monitor Out

Video Monitor Out

Aerial Impedance: 75Ω unbalanced, Coaxial Type Stand-by Power

Consumption: 1W Receiving System: PAL-I, B/G, H, D/K, PAL-525/60

SECAM L/L’ B/G, D/K M.NTSC, NTSC (AV only)

Intermediate Frequency:

Video 39,5MHz, 38,9MHz, 34MHz Sound 32,9MHz, 33,4MHz, 33,16MHz

32,4MHz, 40,4MHz

Colour 34,47MHz (PAL)

34,5MHz, 34,65MHz (SECAM)

Receiving Channels: VHF E2-E12 VHF H1-H2 (ITALY) VHF A-H (ITALY) VHF R1-R2 VHF R3-R5 VHF R6-R12 UHF E21-E69 CATV (S01-S05) CATV S1-S10 (M1-M10) CATV S11-S20 (U1-U10) CATV S21-S41 (HYPERBAND)

Video/Audio Terminals:

AV1 IN Video (21 pin) 1V p-p 75Ω

Audio (21 pin) 500mV rms 10kΩ

AV1 IN (Front) Audio (RCAx1) 500mV rms10kΩ

Video (RCAx1) 1V p-p 75Ω S-Video IN Y: 1V p-p 75Ω (4 pin) C: 0.3V p-p 75Ω

High Voltage: 20kV +0,7kV/-1kV Picture Tube: A23KQU22X01 Audio Output: 3,5W (Music Power)

8Ω Impedance

Headphones: 8Ω Impedance

3,5 mm

Accessories supplied : Remote Control

2 x R6 (UM3) Batteries

Dimensions:

Height: 272 mm Width: 283 mm Depth: 309 mm

Net weight: 7kg Specifications are subject to change without notice.

Weights and dimensions shown are approximate.

NOTE: This Service Manual should be used in conjunction with the AC1 Technical Guide.

AV1 OUT Video (21 pin) 1V p-p 75Ω

Audio (21 pin) 500mV rms 1kΩ

Panasonic CS ( U.K. ) Ltd.

WILLOUGHBY ROAD,

BRACKNELL,

BERKS.,

RG12 8FT.

CONTENTS

SAFETY PRECAUTIONS..........................................................................................................................................................2

SERVICE HINTS.......................................................................................................................................................................3

SERVICE POSITION.................................................................................................................................................................4

ADJUSTMENT PROCEDURE...................................................................................................................................................5

WAVEFORM PATTERN TABLE...............................................................................................................................................6

ALIGNMENT SETTINGS...........................................................................................................................................................7

BLOCK DIAGRAMS..................................................................................................................................................................8

PARTS LOCATION.................................................................................................................................................................12

REPLACEMENT PARTS LIST................................................................................................................................................13

SCHEMATIC DIAGRAMS.......................................................................................................................................................22

CONDUCTOR VIEWS.............................................................................................................................................................25

SAFETY PRECAUTIONS

GENERAL GUIDE LINES

1. It is advisable to insert an isolation transformer in the a.c. supply before servicing a hot chassis.

2. When servicing, observe the original lead dress in the high voltage circuits. If a short circuit is found, replace all parts that have been overheated or damaged by the short circuit.

3. After servicing, see that all the protective devices such as insulation barriers, insulation papers, shields and isolation R-C combinations are correctly installed.

4. When the receiver is not being used for a long period of time, unplug the power cord from the a.c. outlet.

5. Potentials as high as 20,7kV are present when this receiver is in operation. Operation of the receiver without the rear cover involves the danger of a shock hazard from the receiver power supply. Servicing should not be attempted by anyone who is not familiar with the precautions necessary when working on high voltage equipment. Always discharge the anode of the tube.

6. After servicing make the following leakage current checks to prevent the customer from being exposed to shock hazard.

LEAKAGE CURRENT COLD CHECK

1. Unplug the a.c. cord and connect a jumper between the two prongs of the plug.

2. Turn on the receiver’s power switch.

3. Measure the resistance value with an ohmmeter, between the jumpered a.c. plug and each exposed metallic cabinet part on the receiver, such as screw heads, aerials, connectors, control shafts etc. When the exposed metallic part has a return path to the chassis, the reading should be between 4M ohm and 20M ohm. When the exposed metal does not have a return path to the chassis, the reading must be infinite.

LEAKAGE CURRENT HOT CHECK

1. Plug the a.c. cord directly into the a.c. outlet. Do not use an isolation transformer for this check.

2. Connect a 2kΩ 10W resistor in series with an exposed metallic part on the receiver and an earth, such as a water pipe.

3. Use an a.c. voltmeter with high impedance to measure the potential across the resistor.

4. Check each exposed metallic part and check the voltage at each point.

5. Reverse the a.c. plug at the outlet and repeat each of the above measurements.

6. The potential at any point should not exceed 1,4 Vrms. In case a measurement is outside the limits specified, there is a possibility of a shock hazard, and the receiver should be repaired and rechecked before it is returned to the customer.

HOT CHECK CIRCUIT

A.C. VOLTMETER

2kΩ 10 Watts

TO INSTRUMENT’S EXPOSED METALLIC PARTS

Fig. 1.

X-RADIATION WARNING

1. The potential sources of X-Radiation in TV sets are the high voltage section and the picture tube.

2. When using a picture tube test jig for service, ensure that the jig is capable of handling 20,7kV without causing X-Radiation.

NOTE: It is important to use an accurate periodically calibrated high voltage meter.

1. Set the brightness to minimum.

2. Measure the high voltage. The meter should indicate :out of tolerance, immediate service and correctio n is required to prevent the possibility of premature component failure.

3. To prevent any X-Radiation possibility, it is essential to use the specified tube.

20kV +0,7kV/-1kV If the meter indication is

WATER PIPE

(EARTH)

SERVICE HINTS

How to remove the rear cover

1. Remove the 7 screws as shown in Fig.2.

2. Push clips (A) and elevate lid.

3. Remove the 2 screws as shown in Fig.3.

Clips

(A)

SCREWS

Fig.2.

LOCATION OF CONTROLS

Y - Board

Q - Board

E - Board

SCREWS

Fig.3.

Focus Screen

S 451 Vertical Position

Fig.4.

HOW TO MOVE THE CHASSIS INTO SERVICE POSITION

1. Remove the backcover screws and clips as shown in Fig.2 and Fig.3 (page3.).

2. Release chassis from right-hand chassis rail and partially withdraw.

3. Rotate, clockwise, the whole T.V. vertically through 90º.

4. After servicing ensure all wiring is returned to its original position before returning the receiver to the customer.

Fig.5.

ADJUSTMENT PROCEDURE

Item / Preparation Adjustments +B SET-UP

1. Receive a Greyscale signal.

2. Set the controls :Brightness Minimum Contrast Minimum Volume Minimum

1. Confirm the following voltages.

TPE2 130 ±4V TPE3 8 ± 0,5V TPE4 12 ± 0,7V TPE11 110 ± 10V TPE6 5 ± 0,3V TPE10 23,5 ± 1,5V TPE5 9 ± 0,5V TPE18 320 ± 2V TPE1 13,5 ± 1V TPE13 31 ± 1,5V TPE7 5 ± 0,3V TPE19 16,5 ± 1V

DC Alignment

1. Confirm and note, in a.c. mode, TPE2.

1. Confirm and note, in a.c. mode, TPE1. 1. Using a 12,8V d.c. power supply, confirm that TPQ27

1. Using a 23V d.c. power supply, adjust R3870 until TPQ28 measures the same as TPE2.

2. Adjust the d.c. power supply to be 12,8V at F3851.

3. Confirm TPQ28 measures the same as TPE2

measures the same as TPE1.

Service Aids

To aid in the service of our current chassis there are a number of Service Aids which have been made available.

• LUCI interface kit (Linked Utility Computer Interface) Part number: TZS6EZ002 This contains interface and cables for connecting TV service connector and a PC as well as diagnostic software. As new models are introduced upgrade software will become available.

• VICI (Visual Interactive Computer Information) These C.D.'s contain multimedia documentation providing quick access to service information. Part No. TZS7EZ006 & TZS7EZ005

1. Service Manuals

2. Instruction Books

3. Technical Information

• TASMIN (Technically Advanced System for Multimedia Interactive Notes) As well as providing a first step towards more interactive training this product also achieves quick access to Technical Information.

WAVEFORM PATTERN TABLE

NOTE: All waveforms have been taken using a standard colour bar pattern.

Input Vert Out I.C. IC451 Pin 4

1.2V

H - Out IC601 Pin 13

5.2V

20mS

64µS

Vert Drive IC451 Pin 2

51V

Video In IC3001 Pin 20

0.9V

20mS

64µS

VFLB IC451 Pin 3

27V

20mS

Video Out IC3001 Pin 16

2.2V

64µS

R - Out IC601 Pin 21

5.75V

R - Y IC601 Pin 43

0.5V

64µS

G - Out IC601 Pin 22

5.75V

B - Y IC601 Pin 41

0.7V

64µS

B - Out IC601 Pin 23

5.75V

64µS

ALIGNMENT SETTINGS

1. To place the TV into Service Mode, set the Sharpness to minimum position, place set in program position 60, press the down button (v) on the customer controls at the front of the TV and at the same time press the Off Timer button on the remote control.

2. Press v / v buttons to step up / down through the functions.

3. Press (

4. Press the TV/AV button after each adjustment has been made to store the required values.

5. To exit the Service Mode, press the "N" button.

(The figures below are nominal and used for representative purposes only.)

+ / - ) buttons to alter the function values.

Alignment Function Settings / Special features

VAmp

Vert. Amplitude

Horizontal Centre

Red Cutoff

Green Cutoff

Blue Cutoff

HCtr

RCut

159

GCut

BCut

182 Optimum setting.

Optimum setting.

Red Drive

Blue Drive

Sub-Contrast

Sub-Colour

Sub-Brightness

RDrv

38 Optimum setting.

BDrv

SCon

SCol

SBri

Optimum setting.

+ 21 hidden pages