Panasonic TX-25P80T Manual de usuario

Power Source AC Auto 110-240 V, 50/60 Hz

Power Consumption 138 W

Standby condition : 0.8 W

Aerial Terminal Impedance : 75Ω, Coaxial type

Tuning System Frequency Synthesizer

Auto Search Tuning

Pos : 100 Positions

Receiving System 17 Systems

Receiving Channels Regular TV

VHF BAND

UHF BAND

CATV

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.)

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.)

S1-S20 (OSCAR)

1-125 (U.S.A. CATV)

C13-C49 (JAPAN)

S21-S41 (HYPER)

Z1-Z37 (CHINA)

Intermediate Frequency

rights reserved. Unauthorized copying and

distribution is a violation of law.

TX-25P80T

MX-10 Chassis

Video

Sound

Colour

38.0 MHz

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

32.0 MHz (I) / 32.5 MHz (M)

33.57 MHz (PAL) /

33.6 MHz (SECAM)

34.42 MHz (NTSC) /

33.75 MHz (SECAM)

Receiving Stereo Sound System QUADRA STEREO / TEXT

Video/Audio/Terminals

AV 1, 2, 3

Y/PB/PR

Monitor Out

IN S-Video Y:1.0Vp-p 75Ω

DVD IN S-Video C:0.3Vp-p 75Ω

(Phone type) Y:1.0Vp-p 75ΩPB,

PR:0.7Vp-p 75ΩVideo 1.0Vp-p

75ΩAudio Approx. 400mV 47KΩ

Video 1,0Vp-p 75Ω

Audio Approx. 400mV 47KΩ

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

current

Picture Tube A60LUQ085X Type 25 (60 cm)

Measured diagonally, 104°

deflection

Audio Output 16 W speaker

Dimensions (WxDxH) 634 mm x 471 mm x 534 mm

Weight (Mass) 37 kg (Net)

Accessories Supplied

Remote Control Transmitter 1. R6(AA) Battery x 2

Colour Television

Specification

Order No. MTV0110238C3

Note:

Specifications are subject to change without notice. Mass and

Dimensions shown are approximate.

1 Safety Precautions 3

1.1. General Guide 3

1.2. Leakage Current Cold Check 3

1.3. Leakage Current Hot Check (See Fig. 1) 3

1.4. X-Radiation 3

2 Location of Controls and Circuit Boards 4

2.1. BACK VIEW 4

2.2. LOCATION AND FUNCTION NAME OF CIRCUIT BOARD

3 Service Hints 5

3.1. HOW TO MOVE CHASSIS INTO SERVICE POSITION.

4 MARKET MODE FUNCTION 6

5 ADJUSTMENT PROCEDURE 8

5.1. B VOLTAGE 8

5.2. RF AGC 8

5.3. HIGH VOLTAGE 8

5.4. SUB TINT 8

5.5. SUB CONTRAST 8

5.6. PAL COLOUR OUTPUT 9

5.7. NTSC COLOUR OUTPUT 9

5.8. COLOUR PURITY 10

5.9. CONVERGENCE 10

5.10. WHITE BALANCE (MARKET MODE CHK 3) 11

6 CONDUCTOR VIEWS 13

6.1. T-Board (TNP4G115AH) and L-Board (TNP4G107AW)

6.2. A-Board (TNP4G164AQ) 14

6.3. H-Board (TNP4G173AB), X-Board (TNP4G108BC) and

7 SCHEMATIC DIAGRAMS 17

7.1. SCHEMATIC DIAGRAM FOR MODEL TX-25P80T (MX-

10A CHASSIS) 17

7.2. Main Board (TNP4G164AQ) 18

7.3. Rear AV Circuit (TNP4G173AB) 20

7.4. CRT Circuit (TNP4G107AW) 21

7.5. Pincushion Circuit (TNP4G108BC) 22

7.6. Teletext Circuit (TNP4G115AH) 23

9 Replacement Parts List 29

9.1. Replacement Parts List Notes 29

9.2. Replacement Parts List 30

CONTENTS

Page Page

TX-25P80T

Partlist

1 Safety Precautions

1.1. General Guide

1.It is advisable to insert an isolation transformer in the AC

supply before servicing a hot chassis. Fig. 1.

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, observe 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 outlet.

5.Potential, as high as 30.0 kV is present when this receiver

is in operation. Operation of the receiver without 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 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

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

(See Fig. 1)

1.Plug the AC cord directly into the AC outlet. Do not use an

isolation transformer for this check.

2.Connect a 2 kΩ, 10 W 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.

Fig. 3

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

above measurements.

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

case of a measurement being outside of the limits specified,

there is a possibility of a shock hazard, and the receiver

should be repaired and re-checked before it is returned to

the customer. Fig. 4.

Fig. 4

1.4. X-Radiation

Warning :

1.The potential sources of X-Radiation in TV sets are the EHT

section and the picture tube.

2.When using a picture tube test rig for service, ensure that

the rig is capable of handling 28.5 kV 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 reading should

indicate 30.0 +0.7, -1.5kV. 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 the possibility of X-Radiation, it is essential to

use the specified picture tube.

TX-25P80T

2 Location of Controls and Circuit Boards

2.1. BACK VIEW

2.2. LOCATION AND FUNCTION NAME OF CIRCUIT BOARD

TX-25P80T

3 Service Hints

3.1. HOW TO MOVE CHASSIS INTO SERVICE POSITION.

1. Remove 9 screws.

2. Draw out Main Chassis.

3. Stand the Main Chassis.

TX-25P80T

4 MARKET MODE FUNCTION

Outline:

MPU controls the functions switching for each ICs through IIC bus in this chassis. The following setting and adjustment can be

adjusted by remote control in Market Mode.

1.Selection of Market Mode

Adjust the VOLUME “zero” and set OFF TIMER Button to 30 min. Then, simultaneously press the RECALL Button on the

remote control and the VOLUME DOWN button - the TV set.

2.Selection of CHK Mode

Cursor moves each CHK Mode by pressing “1” or “2” of 10 key button 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 the 10 key button.

Display Adj. Range

COLOUR SYSTEM 0~6

MX 10A OFF / ON

C4 BIT OFF / ON

NOISE MUTE OFF / ON

SPEED OFF / ON

VCR / GAME OFF / ON

YUV OFF / ON

AV3 OFF / ON

STEREO OFF / ON

GEO 0~2

SASO 0~2

TEXT OFF / ON

PANA DISPLAY OFF / ON

SOUND SYS 0~5

2.VCJ Adjustment Mode

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

Volume “+” or “-” button.

Display Adj. Range

SUB COLOUR 00H ~ 3FH

COLOUR 0~63

RF AGC 00H ~ FFH

SECAM B-Y 00H ~ 0FH

SECAM R-Y 00H ~ 0FH

B-Y 00H ~ 0FH

R-Y 00H ~ 0FH

SUB TEXT CONT 00H ~ 3FH

SHARPNESS 0~63

SUB Y CONT 00H ~ 3FH

CONT 0~63

SUB BRIGHT 00H ~ FFH

BRIGHT 0~63

SUB NTS-TINT 00H ~ 3FH

TX-25P80T

3.Pincushion Adjustment Mode

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

Volume “+” or “-” button.

Display Adj. Range

PARABOLA 00H ~ 3FH

60 V-HEIGHT 00H ~ 3FH

50 V-HEIGHT 00H ~ 3FH

SUB GEO 00H ~ 3FH

GEOMAGNETIC -9 AUTO 9

V CENTER 00H ~ 07H

50Hz CENTER 00H ~ 1FH

EW-CORNER 1 00H ~ 0FH

TRAPEZOID 00H ~ 3FH

V-LINEAR 00H ~ 3FH

60 VS CORRECT 00H ~ 3FH

50 VS CORRECT 00H ~ 3FH

H-WIDTH 00H ~ 3FH

Note : Picture will be changed to one horizontal line by pressing “5” of the 10 key button in the remote control. (1 - 5).

4.White Balance Adjustment Mode

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

Volume “+” or “-” button.

Display Adj. Range

B. DR 00H ~ FFH

G. DR 00H ~ FFH

SUB.BR 00H ~ FFH

BRIGHT 0~63

B - CUT 00H ~ FFH

G - CUT 00H ~ FFH

R - CUT 00H ~ FFH

TX-25P80T

5 ADJUSTMENT PROCEDURE

5.1. B VOLTAGE

Item/Preparation Adjustment Procedure

1.Operate the TV set.

2.Set controls : (MARKET MODE CHK 2)

Bright ............. Minimum

Contrast ......... Minimum

Volume ............. Minimum

1.Confirm that the indicated test points for the

specified voltage:

TPA 140 : 141±2V

TPA 12 : 12±1.0V

TPA 9 : 9±1V

TPA 5 & TPA 32 : 5±1V

TPA 220 : 220±15V

5.2. RF AGC

Item/Preparation Adjustment Procedure

1.Receive a colour bar pattern.

2.Set the input level to 66 (+1.2) db.

(75Ωopened)

3.Connect an oscilloscope to AGC : TPA 20 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 :

TPA 20 begins to drop.

3.Increase the input level by 3 db and confirm that the voltage

changes.

5.3. HIGH VOLTAGE

Item/Preparation Adjustment Procedure

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 D850 cathode and confirm the

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+0.7V,

-1.5V.

5.4. SUB TINT

Item/Preparation Adjustment Procedure

1.Receive a 3.58 MHz NTSC rainbow pattern

2.Connect oscilloscope to A21 pin 6.

3.Set controls:

BRT................CENTER

COLOUR........CENTER

CONTRAST....MAX

NTSC TINT.....CENTER

AI....................OFF

1.Adjust Sub NTSC Tint so that the peak of level of waveform is

similar to Fig. 3

2.Receive the Rainbow pattern (3.58 MHz NTSC) on both of Main

and Sub pictures.

3.Adjust Sub NTSC Tint 2 so that the peak of level of 1.3±0.5V

5.5. SUB CONTRAST

Item/Preparation Adjustment Procedure

1.Receive a colour bar pattern.

2.Connect an oscilloscope to TPA40.

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

TPA54 FBT pin 3 or TPA34 and TPA32.

4.Set controls:

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

AI ............................. off

1.Adjust Bright Colour:

a=2.4±0.2Vp-p

2.Adjust Sub Contrast Colour:

b=2.4±0.1Vp-p

TX-25P80T

5.6. PAL COLOUR OUTPUT

Item/Preparation Adjustment Procedure

1.Receive PAL colour bar pattern.

2.Connect an oscilloscope probe to TPA40.

3.Connect a short jumper to FBT pin 3 or TPA34 and TPA32.

4.Set control :

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

AI......................................off (for model with AI only)

1.Adjust Bright Control.

a = 2.3±-0.2Vp-p

2.Adjust Sub Colour control.

3.Connect the osciloscope probe to TPA40.

4.Connect the waveform.

b = 3.1±-0.5Vp-p

5.7. NTSC COLOUR OUTPUT

Item/Preparation Adjustment Procedure

1.Apply 3.58MHz NTSC Rainbow pattern.

2.Connect an oscilloscope to TPA40.

3.Connect a short jumper to FBT pin 3 or TPA34 and TPA32.

4.Set control :

Picture menu.......................DYNAMIC CONTROL

Channel Colour Set...........STD

1.Adjust Bright Control.

a = 2.3±-0.2Vp-p

2.Connect the waveform.

b = 1.3±-0.5Vp-p

TX-25P80T

5.8. COLOUR PURITY

1.Set Bright and Contrast controls to their maximum

positions.

2.Operate the TV set over 15 minutes.

3.Full 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 roughly the

static convergence magnets.

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 magnet so that a vertical green field is

obtained at the center of the screen.

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.

5.9. CONVERGENCE

1.Apply a crosshatch pattern signal and set Contrast control

to the maximum position.

2.Adjust Bright control to obtain a clear pattern.

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

4.Adjust Red and Blue with Green line at center 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.

7.Fix the deflection yoke by re-inserting the DY wedges.

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. Center and Focus

adjustments must be completed.

TX-25P80T

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