Panasonic TX-21AP2D, TX-21AP2F, TX-21AP2P, TX-21AP2B Service Manual

ORDER No. PCZ0409020C2

Service Manual

Colour Television

TX-21AP2D

TX-21AP2F

TX-21AP2P

TX-21AP2D/B

TX-21AP2P/B

GP3L Chassis

SPECIFICATIONS

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

Power Consumption: 50W

Stand-by Power Consumption: 0,9W

Aerial Impedance: 75Ω unbalanced, Coaxial Type

Receiving System: PAL-I, B/G, D/K,

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

PAL 525/60 (AV only)

NTSC (AV only)

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/Audio

Video 38,9MHz, 33,9MHz Sound 33,4MHz (B/G), 33,16MHz (A2)

33,05MHz (NICAM B/G,D/K,L) 32,4MHz (D/K),32,66MHz (CZ STEREO) 40,4MHz (L’), 39,75MHz (L’NICAM)

Colour 34,47MHz (PAL)

34,5MHz, 34,65MHz (SECAM) 38,3MHz, 38,15MHz (SECAM L’)

AV2 FRONT Audio (RCAx2) 500mV rms 10kΩ

Video (RCAx1) 1V p-p 75Ω

High Voltage: 26,0kV ± 1kV

Picture Tube: A51ERF135X71 51cm

Audio Output: 2x5W RMS, 2x10W MPO,

8Ω impedance

Headphones: 8Ω Impedance

Accessories supplied : Remote Control

2 x R6 (UM3) Batteries

Dimensions:

Height: 471mm Width: 524mm Depth: 472mm

Net weight: 22kg

Terminals:

AV1 IN Video (21 pin) 1V p-p 75Ω

Audio (21 pin) 500mV rms 10kΩ RGB (21 pin) 0,7V p-p 75Ω

AV1 OUT Video (21 pin) 1V p-p 75Ω

Audio (21 pin) 500mV rms 1kΩ

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

CONTENTS

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

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

ADJUSTMENT PROCEDURE AND SELF-CHECK.................................................................................................................. 4

WAVEFORM PATTERN TABLE............................................................................................................................................... 5

ALIGNMENT SETTINGS .......................................................................................................................................................... 6

BLOCK DIAGRAMS.................................................................................................................................................................. 7

PARTS LOCATION................................................................................................................................................................. 10

REPLACEMENT PARTS LIST................................................................................................................................................ 11

SCHEMATIC DIAGRAMS....................................................................................................................................................... 18

CONDUCTOR VIEWS ............................................................................................................................................................ 21

SAFETY PRECAUTION

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 27kV 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 previous 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 27kV 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:

26kV ± 1kV. 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 any X-Radiation possibility, it is essential to use the specified tube.

WATER PIPE

(

EARTH)

SERVICE HINTS

How to remove the rear cover

1.Remove the 5 screws as shown in Fig.2.

SCREWS

LOCATION OF CONTROLS

SCREWS

Fig. 2

D-Board

Focus

Fig. 3

L-Board

Screen

ADJUSTMENT PROCEDURE

Item / Preparation Adjustments +B SET-UP

1. Receive a Window pattern.

2. Set the controls :

Brightness Minimum

Contrast Minimum

Confirm the following voltages:

TP4 5 ± 0,25V TP14 5 ± 0,25V TP5* 16 ± 0,5V TP21 12,5 ± 0,5V TP6 8 ± 0,5V TP121 180 ± 10V TP7 9,4 ± 0,5V TP123 -14,5V ± 1V TP8** 3,3 ± 0,2V TP124 14,5 ± 1V TP11*** 12,4 ± 0,5V TP12 142 ± 1,5V

* Volume to minimum ** Under shield case *** Volume to maximum

UG2 / CUT OFF

1. Receive a Window pattern.

2. Set Brightness and Contrast to minimum.

3. Set the TV into Service Mode 1.

4. Select UG2 item.

Press "+" or "-". Adjust the screen VR till LED is just switched on.

SELF CHECK

Self-check is used to automatically check the bus lines and hexadecimal code of the TV set.To enter Self-Check mode,you must set Bass to max and Treble to min, press the STATUS button on the remote control and at the same time press the down (-/v) button on the customer controls at the front the TV set. To exit Self Check, switch off the TV set at the power button.

TX-21AP2D TX-21AP2F TX-21AP2P

TX-21AP2D/B TX-21AP2P/B

OPTION 1 1C 9C 9D OPTION 2 10 18 10

WAVEFORM PATERN TABLE

CONDITIONS: Contrast: MAX, Brightness: MID, Colour: MID, Sharpness: MID

ALIGNMENT SETTINGS

(The figures below are nominal and used for representative purposes only.) To access Service Mode select program position 99 and set sharpness to minimum. Press “MUTE” button on remote control and at the same time press the "∨" button on the customer controls at the front of the TV, this will place the TV set into Service Mode1. Press ∧ / ∨ buttons to step up / down through the functions. Press + / - buttons to alter the function values. Press “STR” button on the customer controls at the front of the TV after each adjustment has been made to store the required values. To exit Service Mode press “N” button.

Alignment Function

EAROM copy TV/EXT ---

UG2 LED ON/OFF LED to be just ON

Verical Slope

Vertical Position

Vertical Amplitude

Horizontal Shift

R-CUT

G-CUT

R-Drive

G-Drive

B-Drive

AGC

Sub Colour

Sub Brightness

Note: All setting values are approximate

Setting indication

V-SLO

031

V-POS

037

V-AMP

022

H-CTR

038

R-CUT

022

G-CUT

036

R-DRV

040

G-DRV

030

B-DRV

AGC

018

S-COL

S-BRI

022

Settings / Special features

Optimum setting.

Q369

D354

D355

B 7

CRT

R 9

G 8

IC351

L-BOARD

534

15423

L OUT P 12

67 QIF IN

60 MONO IN

2 L IN

Q2103

DACM_L

4 R IN

Q2102

DACM_R 27

IC2301

SOUND

IC2101

MULTI-STANDART

L OUT M 11

R OUT M 9

R OUT P 8

AUDIO OUTPUT IC

SC1_IN_R 57

SC1_IN_L 56

SC2_IN_R 54

SC2_IN_L 53

SC2_OUT_L 34

PROCESSOR

SC2_OUT_R 33

20 VIDEO IN

19 VIDEO OUT

15 R IN

11 G IN

7 B IN

6 L IN

3 L OUT

2 R IN

1 R OUT

JK3201

HEADPH

Front AV2 terminal

AV1 21 PIN SCART

Q2003

58 B OUT

57 G OUT

56 R OUT

VIDEO & STEREO AUDIO & DEFLECTION BLOCK DIAGRAM

D-BOARD

TUNER

Q605

CVBSEXT 42

IC601

18 IF1

X102

19 IF2

IF VO 38

VIDEO IBT

TDA 9594

MICROPROCESSOR

23 SIF1

X201

CVBS-3 44

MONO OUT 48

76 L/L’

XF101

180

Q601

QIF OUT 33

B IN 53

G IN 52

R IN 51

Q602

Q603

T551

+ 17

30 H-OUT

Q501

31 FBI

V- 16

24 SIF2

IC451

VERTICAL

T553

Q551

DIODE

MODULATOR

D10

4 3 1

DEFLECTION

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