Panasonic AD1E-E Service Manual

Service Manual

Colour Television EURO 2 Chassis

TX-25AD1E TX-29AD1E

Safety Specifications Block Diagram(Video) Block Diagram(Audio) Block Diagram(Control) Parts List Service Information

PCB view(E)

PCB view(Y) PCB view(F) PCB view(A) PCB view(B)

Adjustments Self Check Service Hints Mechanical View Disassembly Location of Controls Waveforms E Schematic (25) E Schematic (29) Y Schematic F Schematic A Schematic B Schematic

BACK

Notes

Service Support

About....

EXIT

PCB view(M)

M Schematic

Service Manual

Specifications

( Information in brackets {} refer to TX-25AD1E)

Power Source : 220-240V AC 50Hz Power Consumption : 110W { 100W } Aerial Impedance : 75W unbalanced, Coaxial Type Receiving System : PAL B/G, PAL 60,

SECAM B/G

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)

Intermediate Frequency :

Video 38.9 MHz Sound 33.4 MHz/33.16 MHz/33.05MHz Colour 34.47 MHz

34.5 MHz/34.65 MHz - (SECAM)

Video / Audio Terminals :

AUDIO MONITOR OUT Audio(RCA x 2) 500mV rms,1kW

AV1 IN Video (21 pin ) 1 Vp-p 75W

Audio (21 pin ) 500mV rms,10kW RGB (21 pin )

AV1 OUT Video (21 pin ) 1 Vp-p 75W

Audio (21 pin ) 500mV rms, 1kW

SM - 95015

Colour Television

TX-29AD1E TX-25AD1E

EURO-2 Chassis

AV2 IN Video (21 pin ) 1 Vp-p 75W

Audio (21 pin ) 500mV rms,10 kW S-Video IN Y : 1 Vp-p 75W (21 pin ) C : 0.3 Vp-p 75W

AV2 OUT Video (21 pin ) 1 Vp-p 75W

Audio (21 pin ) 500mV rms, 1kW Selectable output (21 pin )

AV3 IN S-Video IN Y : 1 Vp-p 75W

(4-pin ) C : 0.3 Vp-p 75W Audio (RCA x 2) 500mV rms,10kW Video (RCA x 1) 1 Vp-p 75W

High Voltage : 31kV _1kV at zero beam current Picture Tube : 72cmV{63 cmV}

Super Flat FST 110° measured diagonally.

Audio Output :

Internal Speaker 2 x 20 W (Music Power)

8W Impedance Headphones 1 x 8 W Impedance Accessories supplied : Remote Control

UM3 Battery Dimensions : Height : 551mm {504mm}

Width : 668mm {606mm}

Depth : 467mm {448mm} Net Weight 41kg {30kg}

Specifications are subject to change without notice. Weight and dimensions shown are approximate.

Contents

Safety Precautions 2 Location of Controls 3 Chassis Service Position 4 Service Mode 7 Self Check 8 Adjustment Procedure 8 Alignment Settings 9 Waveform Pattern Table 10 P.C.B. Views 11 Block Diagrams 16 Schematic Diagrams 20 Parts Location 26 Replacement Parts List 27

Safety Precautions

General Guide Lines

1. It is advisable to insert an isolation transformer in the AC 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 which 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 RC combinations are correctly installed.

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

5. Potentials as high as 32 kV 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 picture to the chassis before handling the tube.

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

3. Use an AC 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 AC 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

Leakage Current Cold Check

1. Unplug the AC 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 AC 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 AC cord directly into the AC outlet. Do not use an isolation transformer for this check.

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

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 32kV 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 31kV _1kV at zero beam current if the meter indication is out of tolerance, immediate service and correction is required to prevent the possibility of premature component failure.

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

Location Of Controls

Service Hints

How to remove the rear cover

1. Remove the 8 fixing screws (A) as shown in Fig.3/Fig.4.

How to move the chassis into the Service position

1. Hold and lift the rear of the E- PCB chassis and M - PCB as shown in fig.5. and gently pull the chassis toward you. Realese the M PCB as explained on page 6

2. Turn the chassis through 90_, anti-clockwise, as shown in fig.6.

3. Clip the chassis onto the support bracket as shown in fig.6 and fig.7.

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

HOW TO REMOVE THE CONTROL PANEL (M-BOARD)

1. Remove the E-board from the cabinet with the M-board attached.

2. Unclip by lifting the front of the M-board vertically.

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

HOW TO REMOVE THE A - BOARD

1. Disconnect the 5 leads from the A - board.

2. Release the A and F boards securing brackets by pushing the clips in the direction shown in Fig.8, and remove the A - board by gently lifting vertically.

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

Service position for the A-Board

1. Remove the A-board from the main chassis (E-board) as shown in Fig.8.

2. Remove the two screws (A) (fig.9) from the plastic AV cover and unclip the AV cover from the A-board.

3. Carefully unclip the three metal clips marked B in fig.9.

4. Unclip the front metal cover (Fig10) and remove from the A-board.

5. Fit the extension leads to the A-board making sure that the A-board does not touch the E-board (fig.11).

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

Note : The extension lead wire kit is supplied as a service kit. (Part number TZS4EP001).

Service Mode

The remote control is used for entering and storing adjustments, with the exception of cut-off adjustments which must always be done prior to service adjustment. Perform adjustments in accordance with screen display. The display on the screen also specifies the CCU variants as well as the approx. setting values.The adjustment sequence for the service mode is indicated below.

1. Set the Bass to maximum position, set the Treble to minimum position, press the F button followed by the Volume down on the customer controls at the front of the TV and at the same time press the Reveal button on the remote control, this will place the TV into the Service Mode.

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

NOTE: This TV also has the option of using a Memory Pack which enables you to copy the preset TV channels and analogue levels into the Memory Pack and then upload them onto another EURO-2 TV set.

3. Press the YELLOW / BLUE buttons to alter the function values.

4. Press the STORE button on the preset panel after each adjustment has been made to store the required values.

5. To exit the Service Mode press the Normalisation button.

Using the Memory Pack

TV to Memory Pack process

1. Plug the memory pack into the lower of the two 21 pin terminals at the back of the TV and switch the TV on. If the TV has only one 21 pin connector then this will be able to accept the memory pack.

2. Go into the Service Mode as explained above. The screen will show:-

3. Press the blue button on the remote control. The screen will show:-

Memory Pack to TV Process

2. Go into the Service Mode as explained above. The screen will show:-

3. Press the STORE button on the TV. The screen will show:-

4. All the tuning information stored inside the Memory Pack will

4. Press the STORE button on the TV. The screen will show:-

5. All the tuning information stored inside the TV will now be transferred to the Memory Pack. This process will take 2-3 minutes to complete and when finished the screen will show:-

now be transferred to the TV. This process will take 2-3 minutes to complete and when finished the screen will show:-

5. The tuning information from the Memory Pack has now been copied into the TV

6. To exit from the Service Mode switch off the TV.

7. The process has now been completed and the Memory Pack can now be removed.

Errors

If an error occurs while using the Memory Pack the TV will detect this and the screen will show:-

If this happens then switch off the TV and repeat the process that was being used. If the errors continue to occur then check the connectors

between the TV and the memory pack and check the 9V battery inside the memory pack.

SELF CHECK

Self check is used to automatically check the Bus lines and Hexadecimal code of the TV set. To enter the Self Check mode press Function down button, on the Preset Panel, at the same time pressing the Status button, on the Remote Control, and the screen will show:-

Adjustment Procedure

Item/Preparation Adjustments

+B SET-UP

1. Operate the TV set

2. Set the controls: Brightness minimum Contrast minimum

RF AGC

1. Receive a test pattern.

2. Connect an oscilloscope between the

tuner RF AGC and ground.

3. Set the oscilloscope gain range to

1V/div.

CUT OFF

1. Receive a black and white signal.

2. Degauss the tube externally.

3. Set the TV into Service Mode 1.

4. Select Ug2 Test.

1. Set the +B voltage up as follows: Adjust P633 so that U147 shows 147V +/- 0.5V

2. Confirm the following voltages.

U5 5 +/- 0.25V U28 28 +/- 1.0V U8 8 +/- 0.5V U40 38.5+1.5/-1.0V U12 12 +/- 0.5V U210 209 +/- 10V U16 16.0 +/- 0.5/-1V U5SB 5.0 +/- 0.25V U25 24.8 +/- 1.0V UM 8 +/- 0.5

1. Check that the noise becomes large when the RF AGC VR P4701 is turned counterclockwise. After the check turn it

clockwise.

2. Gradually turn the RF AGC VR anti-clockwise, and set the RF AGC VR to the point where the RF AGC voltage is just falling to a point where this voltage drops by 0.2V from the maximum value.

1. Confirm which colour has the biggest value

2. Turn the screen VR P3368 to minimum.

3. Connect an oscilloscope to the cathode with the biggest value colour.

4. Adjust P3368 to get a low light pulse voltage of 180V +/- 5V.

5. Adjust P3362 to whichever colour reaches 50 +/- 10 first.

COMB FILTER

1. Receive A PAL colour bar signal. 1. Confirm input video signal (pin 4 W2601 is 1Vp-p).

2. Adjust P2601 to obtain 2Vp-p at TPF1.

Alignment Settings

Alignment Function TX-29AD1E TX-25AD1E Settings / Special features

1. Vertical amplitude V-AMP 051

2. Vertical symmetry V-SYM 013

3. Vertical linearity V-LIN 012

4. Vert. D.C. Vert. D.C. 000

5. V-Pos. V. Pos 003

6. Horizontal amplitude H-AMP

-033

7. Horizontal position H-POS 049

8. Text Position TEXT POSITION 045

9. EW-amplitude E-W AMP1

-058

10. EW-amplitude E-W AMP2 023

11. Trapezium-comp TRAPEZ-1

-014

12. Trapezium- comp TRAPEZ-2 012

13. Colour VCO COLOUR VCO 015

14. Cut-off DC CUT-OFF DC 050

15. Ug2 Test Ug2 Test

107 021 023

16. Cutoff Cutoff

045 055 050

17. White White

224 255 237

V-AMP

063

V-SYM

002

V-LIN

-020

Vert. D.C.

000

V. Pos

005

H-AMP

-044

H-POS

069

TEXT POSITION

049

E-W AMP1

-058

E-W AMP2

044

TRAPEZ-1

-000

TRAPEZ-2

-009

COLOUR VCO

006

CUT-OFF DC

050

Ug2 Test

94 044 020

Cutoff

057 064 056

White

200 255 248

Optimum setting

Not to be adjusted.

To adjust the screen settings. Turn P3362 until a colour reaches 25"5, place an oscilloscope probe on the cathode with the highest output and adjust P3368 so the oscilloscope trace reads 150V 0-peak (160V 0-peak TX 25AD1E), then turn P3362 up so the highest numbered box on the TV screen reads 050 " 010.

Press the GREEN button to step through the settings. Adjust for optimum.

PCB

POWER SUPPLY AND CONTROL BLOCK DIAGRAM

I2651

COMB FILTER

CONTROL

I2601

COMB FILTER

I561

VERTICAL OUTPUT

I466

AUDIO OUTPUT

27V

D557

200V

FBT

D547

I4071

12V REG

I1871

EPROM

PROGRAMME

MEMORY

SOUND PROCESSOR

IF PROCESSOR

I1301

I4700

MICROPROCESSOR

CONTROL

I1801

I1351

8V REG

I1601

VIDEO PROCESSOR

I661

12V REG

12V

I1941 EEPROM MEMORY

TUNER

I646

9V REG

HEADPHONE

AMP

I1011

SWITCHING

Q526

DRIVER

150V

PSU

CONTROL

T6101

I611

Q543 LINE

OUTPUT

2 4 V

15V

D6101

20V

Q674

I1601

5V REG

5VSB

CLOCK 4 DATA CLOCK 1

12V

5VSB

9V 15V 5V

15V

I1751

TEXT

MEMORY

I1981

RESET

I1701

TELETEXT

I1111

SWITCHING

VIDEO BLOCK DIAGRAM

AV1

AV2

AV3

TUNER

X4704

FILTER

Q1172

MIXER

VIDEO DEMODULATOR

Q1123

BUFFER

Q1167

BUFFER

Q1163

BUFFER

I1601

VIDEO PROCESSOR

I4700

I1111

AV SWITCH

Q4701

BUFFER

Q1182

BUFFER

I1701

TELETEXT

Q2613

BUFFER

Q2614

AMP

Q1267

BUFFER

Q1192

BUFFER

Q2651

BUFFER

I 1 7 5

1 M E M O R Y

Q2602

BUFFER

I2601

COMB FILTER

Q2611

BUFFER

FILTER

Q2601

BUFFER

Q2604

BUFFER

SPOT SU

Q2612

BUFFER

Q2653

BUFFER

I2651

Q2609

BUFFER

Q2603

DRIVER

Q3368

PRESS

Q2608 Q2606

AMP

Q2610

BUFFER

Q2607 Q2605

AMP

Q3359

CUTOFF

Q3368

SPOT SU

PRESS

Q1651

AMP

Q1641

AMP

Q1631

AMP

Q1653

BUFFER

Q1643

BUFFER

Q1633

BUFFER

Q1656

AMP

Q1646

AMP

Q1636

AMP

Q3162 Q3164 Q3166

Q3169 Q3391

Q3172 Q3174 Q3176

Q3179 Q3381

Q3182 Q3184 Q3186

Q3189 Q3371

Q3393 DRIVE

Q3383 DRIVE

Q3373 DRIVE

Q3394 Q3397

OUTPUT AMP

Q3384 Q3387

OUTPUT AMP

Q3374 Q3377

OUTPUT AMP

RESISTOR

MATRIX

Q3109 Q3108 Q3111 Q3122

Q3143

AMP

Q3131 Q3136

OUTPUT AMP

Q3126 Q3127

DRIVER

AUDIO BLOCK DIAGRAM

TUNER

AV2

X4704

FILTER

Q1091

MUTE

AV SWITCHING

I1011

Q4704

BUFFER

Q1071 MUTE

Q4704

AMP

Q1466

BUFFER

SIF FILTER

Q4702

AMP

I1301

AUDIO

MIXER

DEMODULATOR

VOLUME

BASS

TREBLE

CONTROL

Q1476

BUFFER

I4700

Q4703

BUFFER

Q1486

BUFFER

Q1496

BUFFER

Q6403 MUTE

Q6433 MUTE

AUDIO OUTPUT

Q498

MUTE

Q497

MUTE

I466

AMP

Q496

MUTE

AV1

AV3

Q6413 Q6417

AMP

Q6443 Q6447

AMP

Q1382

MUTE

Q463

MUTE

Q494

MUTE

Q1812

BUFFER

WIRING BLOCK DIAGRAM

MAFEB

41W

127

933

301W640

01J

01W

1W2

1W1

1W612

214

252

W4001

W63

60W54

317

52W

260

W3316

W6102

W6010

W1370

W610

W1951

W1511

W511

W1201

W211

AV3

W1221

W1211

AV1

AV2W7

W534

W569

W619

DEGAUSS

V DY

H DY

W534VMCOIL

W3316

W554

TO CRT

SCREEN

FACTORY

ADJUSTMENT

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