Read Panasonic TC-21P50R Service Manual online
Picture Tube:
A51LSK655X
Type21, 90
Type21, 90
deflection
High Voltage:
28.5(+0.7, -1.5) kV at zero beam current
Audio Output:
Internal Speaker
15 W [7.5 W+7.5 W](10% THD)
Headphones
3.5mm Plug
Video/Audio Terminals:
AV1, 2, 3 IN
Video
1 Vp-p 75
S-Video
Y: 1.0 Vp-p 75
C: 0.3Vp-p 75
Audio
Approx. 0.5V 47k
Monitor OUT
Video
1Vp-p 75
Audio
Approx. 0.5V 1k
Dimensions:
Height:
471 mm
Width:
657.2 mm
Depth:
472 mm
Mass:
25.7 kg(Net)
Accessories Supplied:
Remote Controller x 1
“R6” Battery x 2
75
“R6” Battery x 2
75
coaxial aerial plug
Design and Specifications are subject to change without notice.
Mass and dimensions shown are approximate.
Mass and dimensions shown are approximate.
Specifications
Power Source:
AC 110V-240V, 50/60Hz
Power Consumption:
125W
7W (Stand-by condition)
7W (Stand-by condition)
Aerial Impedance:
75
unbalanced Coaxial
Tuning System:
17 Systems
VoltageSynthesizer
Auto Search Tuning
100(Position)
VoltageSynthesizer
Auto Search Tuning
100(Position)
Receiving Channels:
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)
21-69
(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)
S21-S41
(HYPER)
1-125
(U.S.A. CATV)
5A, 9A
(AUST.)
Z1-Z37
(CHINA)
C13-C49
(JAPAN)
Intermediate Frequency:
Video
38.0 MHz
Sound
31.5 MHz (D, K)/32.0 MHz (I)
32.5 MHz (B, G)/33.5 MHz (M)
32.5 MHz (B, G)/33.5 MHz (M)
Colour
33.57 MHz (PAL)/33.6 MHz (SECAM)
33.75 MHz (SECAM)/34.42 MHz (NTSC)
33.75 MHz (SECAM)/34.42 MHz (NTSC)
ã
ORDER NO.ITD9910034C3
Colour Television
TC-21P50R
MX-8 Chassis
- 2 -
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- 3 -
Safety Precautions
General Guide
1. It is advisable to insert an isolation transformer in the AC
supply before servicing a hot chassis.
2. When servicing, observe the original lead dress, espe-
cially 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.
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.
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 29.2 kV, is present when this
receiver is in operation. Operation of the receiver with-
out 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 volt-
age equipment. Always discharge the anode of the pic-
ture tube to the receiver chassis before handling the
tube.
out 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 volt-
age equipment. Always discharge the anode of the pic-
ture tube to the receiver chassis before handling the
tube.
6. After servicing make the following leakage current
checks to prevent the customer from being exposed to
shock hazards.
shock hazards.
Leakage Current Cold Check
1. Unplug the AC cord and connect a jumper between the
two prongs on the plug.
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 chas-
sis, the reading should be between 4 M
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 chas-
sis, the reading should be between 4 M
and 20 M
.
When the exposed metal does not have a return path to
the chassis, the reading must be
the chassis, the reading must be
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 2 k
, 10W resistor, in series with an exposed
metallic part on the receiver and an earth such as a
water pipe.
water pipe.
3. Use an AC voltmeter, with high impedance type, to mea-
sure the potential across the resistor.
4. Check each exposed metallic part, and measure the
voltage at each point.
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 1.0 V rms.
In case a measurement is outside of 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.
there is a possibility of a shock hazard, and the receiver
should be repaired and rechecked before it is returned to
the customer.
Isolation T ransformer
power-on
Hot - Check Circuit
AC Voltmeter
Water Pipe
(Earth)
To
Instrument's
Metallic Parts
Exposed
Instrument's
Metallic Parts
Exposed
2k
Ω
10W
- 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 jig for service, ensure
that jig is capable of handling 29.2kV without causing X-
Radiation.
Radiation.
Note :
It is important to use an accurate periodically cali-
brated high voltage meter.
brated high voltage meter.
1. Set the brightness to minimum.
2. Measure the High Voltage. The meter reading should
indicate 28.5 ( +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 compo-
nent failure.
out of tolerance, immediate service and correction is
required to prevent the possibility of premature compo-
nent failure.
3. To prevent an X-Radiation possibility, it is essential to
use the specified picture tube.
MEMO
