Panasonic TX-25P20T Manual de usuario

Power Source : AC AUTO 110 / 240V, 50/60Hz

Power Consumption : 165W (Max) 0.7W (Stand-by

condition)

Aerial Impedance: 75ΩCoaxial type

Tuning System: Frequency Synthesizer Auto

Search Tuning Pos : 100 Positions

Receiving System : 17 System

Receiving Channels :

VHF 2-12 (PAL/SECAM B,K1) 0-12

(PAL B AUST)1-9 (PAL B N.Z) 1-

12 (PAL/SECAM D) 1-12 (NTSC M

JAPAN) 2-13 (NTSC M U.S.A)

UHF 21-69 (PAL G,H,I/SECAM

G,K,K1)28-69 (PAL B AUST) 13-

57 (PAL D,K)13-62 (NTSC M

JAPAN)14-69 (NTSC M U.S.A)

CATV S1-S20 (OSCAR) 1-125 (U.S.A

CATV) C13-C49 (JAPAN) S21-

S41 (HYPER)Z1-Z37 (CHINA)

Intermediate Frequency :

Video 38.0 MHz

Sound 31.5 MHz (D,K) / 32.5MHz (B,G)

32.0 MHz (I) / 32.5MHz (M)

rights reserved. Unauthorized copying and

distribution is a violation of law.

TX-25P20T

MX-8A Chassis

Colour 33.57 MHz (PAL)33.6 MHz

(SECAM) 34.42 MHz (NTSC)33.75

MHz (SECAM)

Receiving Stereo Sound System AV STEREO / TEXT

Video / Audio Terminals :

AV 1,2,3 IN S-Video Y:1.0V p-p 75ΩDVD IN S-Video C:0.3Vp-p 75Ω

Y/PB/PR (Phone type) Y:1.0 Vp-p 75ΩPB, PR:0.7 Vp-p 75ΩVideo 1.0

Vp-p 75ΩAudio Approx. 400mV 47KΩ

Monitor Out : Video 1.0 Vp-p 75ΩAudio Approx,

400mV 1kΩ

High Voltage : 31.0 kV (+0.7, -1.5kV )at zero

beam current

Picture Tube : A60LQK285X Type 25

(60cm)Measured diagonally, 104°

deflection

Audio Output : 16W

Dimensions : Height : 530 mmWidth : 626

mmDepth : 456 mm

Mass : 35.0 kg (Net)

Accessories Supplied Remote Control Transmitter x 1, R6 Battery x 2

Specifications are subject to change without notice. Mass and

dimensions shown are approximate.

Colour Television

Specification

ORDER NO. MTV0005131C3

1 Safety Precautions 3

1.1. General Guide 3

1.2. Leakage Current Cold Check 3

1.3. Leakage Current Hot Check 3

1.4. X-Radiation 4

2 Location of Controls and Circuit Boards 4

3 Service Hints 6

4 Special Service Procedure 6

4.1. Market Mode Function 7

5 Adjustments 9

5.1. White Balance (MARKET MODE CHK 3) 11

6 G-BOARDTNP4G120AK 13

6.1. A-BOARDTNP4G104BM 14

7 H-BOARDTNP4G131AC 15

8 X-BOARDTNP4G108AQ 16

9 T-BOARDTNP4G115AC 16

10 L-BOARDTNP4G107AQ 17

11 Schematic Diagram for models TC-15PM10R (MX-7 Chassis)

12 SCHEMATIC 1 19

13 SCHEMATIC 2 20

14 SCHEMATIC 3 21

14.1. SCHEMATIC 4 22

14.2. SCHEMATIC 5 23

14.3. SCHEMATIC 6 (LEFT HALF) 24

14.4. SCHEMATIC 6 (RIGHT HALF) 25

14.5. EXPLODED VIEW 26

15 Replacement Parts List 27

CONTENTS

Page Page

TX-25P20T

1 Safety Precautions

1.1. General Guide

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

Fig. 1

2.When servicing, observe the original lead dress, especially the 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 to it that all the protective devices such as insulation barriers, insulation papers, shields, and isolation R-C

combinations, are properly installed.

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

5.Potential, as high as 31.7 kV. is 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

thoroughly familiar with the precautions necessary when working on high voltage equipment. Always discharge the anode of the

picture tube to the receiver chassis before handling the tube. After servicing make the following leakage current checks to

prevent the customer from being exposed to shock hazards.

1.2. Leakage Current Cold Check

1.Unplug the AC cord and connect a jumper between the two prongs on the plug. Fig. 2.

Fig. 2

2.Turn on the receiver’s power switch.

3.Measure the resistance value, with an ohmmeter, between the jumper 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

Ω

ΩΩ

Ωand 20 MΩ

ΩΩ

Ω. When the exposed metal does not have a return path to the chassis,

the reading must be zero.

1.3. 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 2kΩ, 10W resistor, in series with an exposed metallic part on the receiver and an earth such as a water pipe.

3.Use an AC voltmeter, with high impedance type, to measure the potential across the resistor.

4.Check each exposed metallic part, and measure the voltage at each point. Fig. 3.

5.Reverse the AC plug in the AC outlet and repeat each of the above measurements.

6.The potential at any point should not exceed 1.0V rms.

In the case of a measurement being outside of these 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. Fig. 4.

TX-25P20T

1.4. 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 rig for service, ensure that the rig is capable of handling 31.7kV without causing X-Radiation.

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

1.Set brightness to minimum.

2.Measure the High Voltage. The meter reading should indicate 31.0 +0.7, -1.5 kV. 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 possibility of X-Radiation, it is essential to use the specified picture tube.

2 Location of Controls and Circuit Boards

Location and Function Name of Circuit Board

A - Main

T - Text

H - Rear Av

L - Crt Board

X - Pin Cushion

G - Power Board

TX-25P20T

3 Service Hints

How to move chassis into service position

1. Remove 9 screws

2. Draw out Main Chassis

3. Stand the Main Chassis

4 Special Service Procedure

Self Check Function

SELF CHECK is used to automatically check the Bus Lines and Option code of the TV set. Contents of the SELF CHECK are

as follows:

TX-25P20T

a.Confirmation result for IC function.

b.Option code.

Procedure

a.Simultaneously push the OFF TIMER button on the remote control and the Volume Down button - on the TV set panel.

b.The TV enters the selfcheck mode and the result is displayed on the screen (as shown below). Please note that the

programme number will be changed to position “1”.

c.Press any key to clear the selfcheck mode and return to the normal state.

2.How to replace memory IC (1102)

Much data for controlling circuits in the TV set is memorized in the Memory IC (IC1102).

a.Change the defective memory IC to the replacement IC.

b.Turn the TV set ON and perform the SELF CHECK Function.

c.When exiting SELF CHECK Mode the customer settings will return to factory setup.

d.Confirm the correct Deflection and White Balance adjustment.

4.1. Market Mode Function

Outline : MPU controls the functions switching for each IC through IIC bus in this chassis. The

following settings and adjustments can be adjusted by remote control in Market Mode.

1.Selection of Market Mode

Adjust VOLUME to “zero” and set OFF TIMER Button (turn on the timer).

Then simultaneously press the RECALL Button on the remote control and the VOLUME DOWN Button on the TV set.

2.Selection of CHK Mode

Cursor moves to each CHK mode by pressing “1” or “2” of 10 key buttons on the remote control.

1.Option Code Setting Mode (CHK 1)

If the memory IC (IC1102) is replaced, option code should be re-memorized.

Option code can be changed by pressing Volume “+” or “-” button.

To memorize, press “0” of 10 key buttons. Fig. A.

Display Adj. Range

Colour sys

Ch. Plan

Noise Mute

Speed

Vcr / Game

Stereo

Geo

Saso

Text

Pana Display

0~6

0~9

Off / On

0~2

Off / On

0~2

Off / On

2.VCJ Adjustment Mode

To change the screen (item) in CHK mode, press “3” or “4” of 10 key buttons. Then Data and Level changes by pressing Volume

“+” or “-” button.

Display Adj. Range

RF AGC

BELL FILTER

SHARPNESS

SUB Y CONTRAST

CONTRAST

SUB-BRIGHT

BRIGHT

SUB NTSC TINT

NTSC-TINT

SUB COLOUR

COLOUR

00H ~ FFH

00H ~ 03H

00H ~ 0FH

0~63

00H ~ 1FH

0~63

00H ~ FFH

0~63

00H ~ 3FH

0~63

3.Pincushion Adjustment Mode

To change the screen (item) in CHK mode, press “3” or “4” of 10 key buttons. Then Data and Level changes by pressing Volume

“+” or “-” button.

TX-25P20T

Display Adj. Range

PARABOLA

V-HEIGHT (60Hz)

V-HEIGHT (50Hz)

V-CENTER

50 H.CENTER

EW CORNER 2

EW CORNER 1

TRAPEZOID

V-LINEAR

60Hz VS CORRECT

50Hz VS CORRECT

H-WIDTH

00H ~ 3FH

00H ~ 7FH

00H ~ 07H

00H ~ 1FH

00H ~ 0FH

00H ~ 3FH

Note: Picture will be changed to the one horizontal line by pressing “5” of 10 key buttons on the remote control (no. 1-5)

4.White Balance Adjustment Mode

To change the screen (item) in CHK mode, press “3” or “4” of 10 key buttons. Then Data and Level changes by pressing Volume

“+” or “-” button.

Display Adj. Range

B.DR

R.DR

SUB.BR

BRIGHT

B-CUT

G-CUT

R-CUT

00H ~ FFH

0~63

00H ~ FFH

TX-25P20T

5 Adjustments

Item / Preparation Adjustment Procedure

B Voltage

1.Operate the TV set.

2.Set control: (MARKET MODE CHK 2)

Brightness.............minimum

Sub Bright.............minimum

Volume.................minimum

Confirm the indicated test points for the specified voltage:

TPA 140 : 140 ± 0.2V

TPA 12 : 12 ± 1V

TPA9:9±1V

TPA 5 & TPA 32 : 5 ± 1V

RF AGC

1.Receive a colour bar pattern.

2.Set the input level to 63 ± 1dB. (75Ωopened).

3.Connect an oscilloscope to AGC:TPA20 with DC mode.

1.Set RF AGC Control such as to procedure a snowy picture.

2.Set RF AGC Control at the point just before the voltage at

AGC:TPA20 begins to drop.

3.Increase the input level by 2dB and confirm that the voltage

changes.

High Voltage

1.Operate the TV set.

2.Receive the crosshatch pattern.

3.Set to 0 Beam.

(Screen Control : min. CONTRAST : min)

1.Connect a DC voltage meter to TPD 16 and confirm the +B voltage

is 141.0 ± 2.0V.

2.Connect a high voltage meter (Electrostatic Type) to an anode of

the picture tube.

3.Confirm that the high voltage is within the range of 31.0 ± 0.7 kV.

Sub Contrast

1.Receive a colour bar pattern.

2.Connect an oscilloscope to TPA41.

3.Connect a short jumper between TPA57 & TPA50 FBT pin3 &

TPA32.

4.Set controls:

Picture menu....................Dynamic Normal

1.Adjust Bright Control:

a=2.3 ± 0.2 Vp-p

2.Adjust Sub Contrast Control:

b=2.8 ± 0.1 Vp-p

PAL Colour Output

1.Receive a PAL colour bar pattern.

2.Connect an oscilloscope probe to TPA41.

3.Connect a short jumper between TPA57 & TPA50 FBT pin3 &

TPA32.

4.Set controls:

Picture menu....................DYNAMIC NORMAL

1.Adjust Bright Control:

a=2.3 ± 0.2 V

2.Adjust Sub Colour control.

3.Connect the oscilloscope probe to TPA41.

4.Connect the waveform:

b=2.2 ± 0.1 Vp-p

NTSC Colour Output

1.Apply 3.58MHz NTSC Rainbow pattern.

2.Connect an oscilloscope probe to TPA40.

3.Connect a short jumper between D11-1 and D11-2 / TPA53 and

TPA54.

4.Set controls:

Picture menu....................DYNAMIC NORMAL

1.Adjust Bright Control:

a=2.3 ± 0.2 Vp-p

2.Confirm that the waveform:

b=1.3 ± 0.5Vp-p

TX-25P20T

TPA 220 : 220 ± 15V

Colour Purity

1.Set the Brightness and Contrast controls to their maximum

positions.

2.Operate the TV set for over 15 minutes.

3.Fully degauss the picture tube by using an external

degaussing coil by rotating R-B static convergence magnet.

4.Apply a crosshatch pattern signal and adjust the static

convergence magnets roughly.

5.Apply a green pattern signal.

6.Loosen a clamp screw for the deflection yoke and move the

deflection yoke as close to the purity magnet as possible.

7.Adjust the purity magnetic so that a vertical green field is

obtained at the centre of the screen.

Fig. 20

8.Slowly press the deflection yoke and set it where a uniform

green field is obtained.

9.Adjust roughly the Low Light controls and make sure that a

uniform white field is obtained.

10.Tighten the clamp screw.

Convergence

1.Apply a crosshatch pattern signal and set Contrast control

to the maximum position.

2.Adjust Brightness control to obtain a clear pattern.

3.Adjust the Red and Blue line at the centre of the screen.

Fig. 22

4.Adjust Red and Blue with Green line at centre of the screen

by rotating (RB) -G static convergence magnet.

5.Lock convergence magnets with silicone sealer.

6.Remove the DY wedges and slightly tilt the deflection yoke

vertically and horizontally to obtain the good overall

convergence.

Fig. 23

7.Fix the deflection yoke by reinserting the DY wedges. Refer

to Fig. 24.

8.If purity error is found, repeat “Colour Purity” adjustment.

Before Colour Purity, Convergence and White Balance adjustments are attempted, V.

Center, V. Height, H. Width, H. Centre and Focus adjustments must be completed.

TX-25P20T

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