Read Panasonic TX-29P90T Service Manual online
Power Source
AC Auto 110-240 V, 50/60 Hz
Power Consumption
129 W
Standby condition : 2 W
Aerial Terminal
Impedance : 75
Ω, Coaxial type
Tuning System
Frequency Synthesizer
Auto Search Tuning
Pos : 100 Positions
Receiving System
17 Systems
Receiving Channels
Regular TV
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.)
CATV
S1-S20 (OSCAR)
1-125 (U.S.A. CATV)
C13-C49 (JAPAN)
S21-S41 (HYPER)
Z1-Z37 (CHINA)
Intermediate Frequency
38.0 MHz
TX-29P90T
GP3 Chassis
Video
31.5 MHz (D, K) / 32.5 MHz (B, G)
32.0 MHz (I) / 32.5 MHz (M)
Sound
33.57 MHz (PAL) /
Colour
33.6 MHz (SECAM)
34.42 MHz (NTSC) /
33.75 MHz (SECAM)
Receiving Stereo Sound System
AV STEREO
Video/Audio/Terminals
IN S-Video Y:1.0Vp-p 75
Ω
AV 1, 2, 3, 4
DVD IN S-Video C:0.3Vp-p 75
Ω
Y / P
B
/ P
R
(Phone Type) Y:1.0Vp-p 75
Ω PB,
PR:0.7Vp-p 75
Ω Video 1.0Vp-p
75
Ω Audio Approx. 400mV 47KΩ
Video 1.0Vp-p 75
Ω
Monitor Out
Audio Approx. 400mV 47K
Ω
High Voltage
31.0 ±1.0V at zero
beam current
Picture Tube
A68QCP83XA Type 29 (68 cm)
Measured diagony,
104° deflection
Audio Output
20 W speaker
Dimensions (W x D x H)
758 mm x 515 mm x 581.2 mm
Weight (Mass)
43.2 kg (Net)
Note:
Specifications are subject to change without notice. Mass and
dimensions shown are approximate.
dimensions shown are approximate.
Colour Television
Specification
Order No. MTV0308257C3
TE
N
TA
TI
V
E
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
1.5.
GP3 Block Diagram
4
2
Location of Controls and Circuit Boards
5
2.1.
REAR VIEW
5
3
Service Hints
6
3.1.
HOW TO MOVE CHASSIS INTO SERVICE POSITION. 6
4
Market Mode Function
7
5
Adjustment Procedure
7
5.1.
B VOLTAGE
7
5.2.
RF AGC
7
5.3.
HIGH VOLTAGE
7
5.4.
SUB TINT
7
5.5.
SUB CONTRAST
8
5.6.
PAL COLOUR OUTPUT
8
5.7.
NTSC COLOUR OUTPUT
8
5.8.
COLOUR PURITY
8
5.9.
CONVERGENCE
9
5.10. WHITE BALANCE (MARKET MODE CHK 3)
9
6
Conductor Views
11
6.1.
A-Board 1/2
11
6.2.
A-Board 2/2
12
7
Schematic Diagrams
13
7.1.
SCHEMATIC DIAGRAM FOR MODEL (MX-12 CHASSIS)
13
8
Parts Locations
15
9
Replacement Parts List
16
9.1.
Replacement Parts List Notes
16
9.2.
Replacement Part List
17
CONTENTS
Page
Page
2
TX-29P90T
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.
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.
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 31.2 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
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.
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.
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 4 M
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 4 M
Ω
Ω
Ω
Ω and 20 MΩ
Ω
Ω
Ω. When the exposed metal does
not have a return path to the chassis, the reading must be
zero.
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 k
Ω, 10 W resistor in series with an exposed
metallic part on the receiver and an earth such as a water
pipe.
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.
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 30.0 kV without causing X-
Radiation.
Radiation.
Note: It is important to use an accurate periodically calibrated
high voltage meter.
high voltage meter.
1. Set the brightness to minimum.
2. Measure the High Voltage. The meter reading should
indicate 31.0 ±1.0kV. If the meter indication is out of
tolerance, immediate service and correction is required to
prevent the possibility of premature component failure.
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.
3
TX-29P90T
1.5.
GP3
Block
Diagram
4
TX-
29P90
T