Read Panasonic TX-29PM1D / TX-29PM1F / TX-29PM1P Service Manual online
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CONTENTS
SAFETY PRECAUTIONS ......................................................................................................................................................... 2
SERVICE HINTS ...................................................................................................................................................................... 3
VOLTAGE CHECK AND OPTION BYTES
................................................................................................................................... 4
WAVEFORM PATTERN TABLE ............................................................................................................................................... 5
ALIGNMENT SETTINGS .......................................................................................................................................................... 6
BLOCK DIAGRAMS.................................................................................................................................................................. 7
PARTS LOCATION................................................................................................................................................................... 9
REPLACEMENT PARTS LIST................................................................................................................................................ 10
SCHEMATIC DIAGRAMS.......................................................................................................................................................
CONDUCTOR VIEWS ............................................................................................................................................................
SAFETY PRECAUTION
GENERAL GUIDE LINES
1.
It is advisable to insert an isolation transformer in the
a.c. supply before servicing a hot chassis.
a.c. supply before servicing a hot chassis.
2.
When servicing, observe the original lead dress in the
high voltage circuits. If a short circuit is found, replace
all parts that have been overheated or damaged by
the short circuit.
high voltage circuits. If a short circuit is found, replace
all parts that have been overheated or damaged by
the short circuit.
3.
After servicing, see that all the protective devices
such as insulation barriers, insulation papers, shields
and isolation R-C combinations are correctly
installed.
such as insulation barriers, insulation papers, shields
and isolation R-C combinations are correctly
installed.
4.
When the receiver is not being used for a long period
of time, unplug the power cord from the a.c. outlet.
of time, unplug the power cord from the a.c. outlet.
5.
Potentials as high as 29,5kV are 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
familiar with the precautions necessary when working
on high voltage equipment. Always discharge the
anode of the tube.
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
familiar with the precautions necessary when working
on high voltage equipment. Always discharge the
anode of the tube.
6.
After servicing make the following leakage current
checks to prevent the customer from being exposed
to shock hazard.
checks to prevent the customer from being exposed
to shock hazard.
LEAKAGE CURRENT COLD CHECK
1.
Unplug the a.c. cord and connect a jumper between
the two prongs of the plug.
the two prongs of the plug.
2.
Turn on the receiver’s power switch.
3.
Measure the resistance value with an ohmmeter,
between the jumpered a.c. 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 ohm and
20M ohm. When the exposed metal does not have a
return path to the chassis, the reading must be
infinite.
between the jumpered a.c. 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 ohm and
20M ohm. When the exposed metal does not have a
return path to the chassis, the reading must be
infinite.
LEAKAGE CURRENT HOT CHECK
1.
Plug the a.c. cord directly into the a.c. outlet. Do not
use an isolation transformer for this check.
use an isolation transformer for this check.
2.
Connect a 2k
10W resistor in series with an
exposed metallic part on the receiver and an earth,
such as a water pipe.
such as a water pipe.
3.
Use an a.c. voltmeter with high impedance to
measure the potential across the resistor.
measure the potential across the resistor.
4.
Check each exposed metallic part and check the
voltage at each point.
voltage at each point.
5.
Reverse the a.c. plug at the outlet and repeat each of
the previous measurements.
the previous measurements.
6.
The potential at any point should not exceed
1,4 Vrms. In case a measurement is outside 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.
1,4 Vrms. In case a measurement is outside 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.
X-RADIATION WARNING
1.
The potential sources of X-Radiation in TV sets are
the high voltage section and the picture tube.
the high voltage section and the picture tube.
2.
When using a picture tube test jig for service, ensure
that the jig is capable of handling 29,5kV without
causing X-Radiation.
that the jig is capable of handling 29,5kV without
causing X-Radiation.
NOTE
: It is important to use an accurate periodically
calibrated high voltage meter.
1.
1.
Set the brightness to minimum.
2.
Measure the high voltage. The meter should indicate:
28,5kV ± 1kV.
If the meter indication is out of tolerance, immediate
service and correction is required to prevent the
possibility of premature component failure.
service and correction is required to prevent the
possibility of premature component failure.
3.
To prevent any X-Radiation possibility, it is essential
to use the specified tube.
to use the specified tube.
HOT CHECK CIRCUIT
a.c. VOLTMETER
WATER PIPE
(
EARTH)
TO INSTRUMENT'S EXPOSED
METALLIC PARTS
METALLIC PARTS
Fig. 1.
2k 10 Watts
2
15
17
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VOLTAGE CHECK
SMT
MAIN B+ Voltage [V]
131,3
͑͑ρ͢·
12V [V]
11,95
͑͑ρͦ͡͝·
STAND BY [V]
12,1
͑͑ρͦ͡͝·
SOUND B+ [V]
12,4
͑͑ρͦ͡͝·
*Volume Min.
11,9
͑͑ρͦ͡͝·
*Volume Max.
FBT
27,9
͑͑ρͦ͡͝Μ·
load Max.
29,5
͑͑ρͦ͡͝Μ·
load Min.
Retrace time
10,92
͑͑ρͣ͡͝ΦΤ
Vcp [V]
1190
͑͑ρͣ͡·
Video Voltage [V]
192
͑͑ρ͖ͦ
13.5V line [V]
12,9
͑͑ρ͖ͦ
45V line [V]
38
͑͑ρ͖ͦ
Heater Voltage [Vrms]
6,2
͑͑ρ͖ͦ
OPTION BYTES
test conditions ;
Input voltage : 230VAC
TV set on ON mode (if nothing specified)
Picture : colour bar - Dynamic
Sound : 1Khz - (mode : Music)
Input voltage : 230VAC
TV set on ON mode (if nothing specified)
Picture : colour bar - Dynamic
Sound : 1Khz - (mode : Music)
2094.0108*
1302.2001*
High Voltage [kV]
test conditions ;
Input voltage : 230VAC
Ct = 6200pF + 7500pF
Cs = 0,36uF
L linearity : TRL-400D
CRT : A68EPD10X22
Input voltage : 230VAC
Ct = 6200pF + 7500pF
Cs = 0,36uF
L linearity : TRL-400D
CRT : A68EPD10X22
Adjust the screen VR till OSD is just change
to GREEN square.
to GREEN square.
G2 SCREEN / CUTOFF
1. Receive a Colour bar pattern
2. Set the TV into Service mode.
3. Select G2 SCREEN item.
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