Panasonic TX-25P20T Service Manual

Panasonic TX-25P20T Service Manual

Mx-8a chassis

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Specification
Power Source :
Power Consumption :
Aerial Impedance:
Tuning System:
Receiving System :
Receiving Channels :
VHF
UHF
CATV
Intermediate Frequency :
Video
Sound
AC AUTO 110 / 240V, 50/60Hz
165W (Max) 0.7W (Stand-by
condition)
75Ω Coaxial type
Frequency Synthesizer Auto
Search Tuning Pos : 100 Positions
17 System
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)
38.0 MHz
31.5 MHz (D,K) / 32.5MHz (B,G)
32.0 MHz (I) / 32.5MHz (M)
TX-25P20T
MX-8A Chassis
Colour
Receiving Stereo Sound System
Video / Audio Terminals :
AV 1,2,3 IN S-Video Y:1.0V p-p 75Ω DVD IN S-Video C:0.3Vp-p 75Ω
Y/PB/PR (Phone type) Y:1.0 Vp-p 75Ω PB, PR:0.7 Vp-p 75Ω Video 1.0
Vp-p 75Ω Audio Approx. 400mV 47KΩ
Monitor Out :
High Voltage :
Picture Tube :
Audio Output :
Dimensions :
Mass :
Accessories Supplied Remote Control Transmitter x 1, R6 Battery x 2
Specifications are subject to change without notice. Mass and
dimensions shown are approximate.
© 2001 Matsushita Electric Industrial Co., Ltd. All
rights
reserved.
distribution is a violation of law.
ORDER NO. MTV0005131C3
Colour Television
33.57
MHz
(PAL)33.6
(SECAM) 34.42 MHz (NTSC)33.75
MHz (SECAM)
AV STEREO / TEXT
Video 1.0 Vp-p 75ΩAudio Approx,
400mV 1kΩ
31.0 kV (+0.7, -1.5kV )at zero
beam current
A60LQK285X Type 25
(60cm)Measured diagonally, 104°
deflection
Height : 530 mmWidth : 626
mmDepth : 456 mm
35.0 kg (Net)
Unauthorized
copying
MHz
16W
and

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Summary of Contents for Panasonic TX-25P20T

  • Page 1 ORDER NO. MTV0005131C3 Colour Television TX-25P20T MX-8A Chassis Specification Power Source : AC AUTO 110 / 240V, 50/60Hz Colour 33.57 (PAL)33.6 (SECAM) 34.42 MHz (NTSC)33.75 Power Consumption : 165W (Max) 0.7W (Stand-by MHz (SECAM) condition) Receiving Stereo Sound System AV STEREO / TEXT Aerial Impedance: 75Ω...
  • Page 2: Table Of Contents

    TX-25P20T CONTENTS Page Page 1 Safety Precautions 8 X-BOARDTNP4G108AQ 1.1. General Guide 9 T-BOARDTNP4G115AC 1.2. Leakage Current Cold Check 10 L-BOARDTNP4G107AQ 1.3. Leakage Current Hot Check 11 Schematic Diagram for models TC-15PM10R (MX-7 Chassis) 1.4. X-Radiation 2 Location of Controls and Circuit Boards...
  • Page 3: Safety Precautions

    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.
  • Page 4: X-Radiation

    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.
  • Page 5 TX-25P20T...
  • Page 6: Service Hints

    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 1. 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...
  • Page 7: Market Mode Function

    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”.
  • Page 8 TX-25P20T Display Adj. Range PARABOLA 00H ~ 3FH V-HEIGHT (60Hz) 00H ~ 7FH V-HEIGHT (50Hz) 00H ~ 7FH V-CENTER 00H ~ 07H 50 H.CENTER 00H ~ 1FH EW CORNER 2 00H ~ 0FH EW CORNER 1 00H ~ 0FH TRAPEZOID...
  • Page 9: Adjustments

    TX-25P20T 5 Adjustments Item / Preparation Adjustment Procedure B Voltage Confirm the indicated test points for the specified voltage: 1. Operate the TV set. TPA 140 : 140 ± 0.2V TPA 12 : 12 ± 1V 2. Set control: (MARKET MODE CHK 2) TPA 9 : 9 ±...
  • Page 10 TX-25P20T Before Colour Purity, Convergence and White Balance adjustments are attempted, V. Center, V. Height, H. Width, H. Centre and Focus adjustments must be completed. Colour Purity Convergence 1. Set the Brightness and Contrast controls to their maximum 1. Apply a crosshatch pattern signal and set Contrast control positions.
  • Page 11: White Balance (Market Mode Chk 3)

    TX-25P20T 5.1. White Balance (MARKET MODE CHK 3) Note : Write down the original value for each address 5.1.1. Preparation before adjusting anything. 1. Receive a colour bar signal with colour “OFF”, and operate the TV set for more than 15 minutes.
  • Page 12: Boardtnp4G120Ak

    TX-25P20T 6 G-BOARD TNP4G120AK...
  • Page 13: A-Boardtnp4G104Bm

    TX-25P20T 6.1. A-BOARD TNP4G104BM...
  • Page 14: Boardtnp4G131Ac

    TX-25P20T 7 H-BOARD TNP4G131AC...
  • Page 15: Boardtnp4G108Aq

    TX-25P20T 8 X-BOARD TNP4G108AQ 9 T-BOARD TNP4G115AC...
  • Page 16: Boardtnp4G107Aq

    TX-25P20T 10 L-BOARD TNP4G107AQ...
  • Page 17: Schematic Diagram For Models Tc-15Pm10R (Mx-7 Chassis)

    TX-25P20T 11 Schematic Diagram for models TC-15PM10R (MX-7 Chassis) IMPORTANT SAFETY NOTICE Components identified by mark have special characteristics important for safety. When replacing any of these components, use only manufacturer’s specified parts. Notes: 1. Resistor All resistors are carbon 1.4W resistors unless marked as follows: Unit of resistance is OHM (Ω) (K=1 000 M=1 000 000)
  • Page 36: Replacement Parts List

    TX-25P20T 15 Replacement Parts List Important Safety Notice Components identified by ! mark have special characteristics important for safety. When replacing any of these components, use manufacturer’s specified parts. Note: Printed circuit board assembly with “NLA” is no longer available after production discontinuation of the complete set.
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Table of Contents