Panasonic TX-G10/C User manual

Service Support
Service and repair of
this product is
supported by
Panasonic's LUCI
interface.
This interface provides a
link between the TV and
a standard PC to allow a
number of diagnostic
and control functions to
be performed.
For more details contact
your local Panasonic
company.
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TX-G10/C Service Manual
Safety
Specifications Block Diagrams
Schematic Diagrams
PCB Views
Self Check
Service
Information
Parts List
Service Hints
Disassembly
Location of
Controls
Waveforms
Mechanical
View
Adjustments
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BACK
BACK
BACK
E - Schematic Q - Schematic
Y - Schematic
E - PCB
Y - PCB
Q - PCB
Audio
Power supply
Control
Video
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Portable Colour Television
TX-G10/C
AC1 Chassis
SPECIFICATIONS
Power Source: 220-240V a.c., 50Hz
12-24V d.c.
Power Consumption: 39W
Aerial Impedance:75Ωunbalanced, Coaxial Type
Stand-by Power
Consumption:1W
Receiving System:PAL-I, B/G, H,D/K,PAL-525/60
SECAM L/L’, B/G, D/K
M.NTSC, NTSC (AV only)
Intermediate Frequency:
Video 38,9MHz, 34MHz
Sound 32,9MHz, 33,4MHz, 33,16MHz
32,4MHz, 40,4MHz, 33,05MHz
32,66MHz
Colour 34,47MHz (PAL)
34,5MHz, 34,65MHz (SECAM)
Receiving Channels: VHF E2-E12 VHF H1-H2 (ITALY)
VHF A-H (ITALY) VHF R1-R2
VHF R3-R5 VHF R6-R12
UHF E21-E69 CATV (S01-S05)
CATV S1-S10 (M1-M10) CATV S11-S20 (U1-U10)
CATV S21-S41(HYPERBAND)
Video/Audio
Terminals:
AV1 IN Video (21 pin) 1V p-p 75Ω
Audio (21 pin) 500mVrms 10kΩ
AV1 IN (Front) Audio (RCAx1) 500mVrms10kΩ
Video (RCAx1) 1V p-p 75Ω
S-Video IN Y: 1Vp-p 75Ω
(4 pin) C: 0.3V p-p 75Ω
AV1 OUT Video (21 pin) 1V p-p 75Ω
Audio (21 pin) 500mVrms 1kΩ
AV2 IN Audio (RCAx1) 500mVrms10kΩ
Video (BNCx1) 1V p-p 75Ω
AV2 OUT Audio Monitor Out
Video Monitor Out
High Voltage: 20kV+0,7kV/-1kV
Picture Tube:A23KQU22X01
Audio Output:3,5W (Music Power)
8ΩImpedance
Headphones:8ΩImpedance
3,5 mm
Accessories
supplied : Remote Control
2 x R6 (UM3) Batteries
Dimensions:
Height:272 mm
Width: 283 mm
Depth: 309 mm
Net weight:7kg
Specifications are subject tochange without notice.
Weights and dimensions shown are approximate.
NOTE: This Service Manual should be used inconjunction with
the AC1 Technical Guide.
ORDER No. SM-98066
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CONTENTS
SAFETY PRECAUTIONS..........................................................................................................................................................2
SERVICE HINTS.......................................................................................................................................................................3
SERVICE POSITION.................................................................................................................................................................4
ADJUSTMENT PROCEDURE...................................................................................................................................................5
WAVEFORM PATTERN TABLE ...............................................................................................................................................6
ALIGNMENTSETTINGS...........................................................................................................................................................7
BLOCK DIAGRAMS..................................................................................................................................................................8
PARTSLOCATION.................................................................................................................................................................12
REPLACEMENTPARTS LIST................................................................................................................................................13
SCHEMATIC DIAGRAMS.......................................................................................................................................................22
CONDUCTOR VIEWS.............................................................................................................................................................25
SAFETY PRECAUTIONS
GENERAL GUIDE LINES
1. It is advisable to insert anisolation transformer in the
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.
3. After servicing, see that all the protective devices
suchasinsulationbarriers, 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.
5. Potentials ashigh as20,7kV are present when this
receiver is in operation.Operation of the receiver
without the rear cover involves the danger of a shock
hazard fromthe receiver power supply. Servicing
should not beattempted by anyone who isnot
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 frombeing exposed
to shock hazard.
LEAKAGE CURRENT COLD CHECK
1. Unplug the a.c. cordand connect a jumper between
the two prongs ofthe plug.
2. Turn on the receiver’spower switch.
3. Measure the resistance value with anohmmeter,
between the jumpereda.c. plug and each exposed
metallic cabinet part onthe receiver, such asscrew
heads, aerials, connectors, control shaftsetc. When
the exposed metallic part has a return path to the
chassis, the reading should bebetween 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. Donot
use an isolation transformer for this check.
2. Connect a 2kΩ10W resistor in series with an
exposed metallic part on the receiver and an earth,
suchasa water pipe.
3. Use an a.c.voltmeter with high impedance to
measure the potentialacrossthe resistor.
4. Check each exposed metallic part and check the
voltage at each point.
5. Reverse the a.c. plug at the outlet and repeat each of
the above measurements.
6. The potential at any point should not exceed
1,4 Vrms. Incase a measurement is outsidethe 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 inTVsets are
the high voltage section and the picture tube.
2. When using a picture tubetest jig for service, ensure
that the jig is capable of handling 20,7kV without
causing X-Radiation.
NOTE: It is important to use an accurateperiodically
calibratedhigh voltage meter.
1. Set the brightness to minimum.
2. Measure the high voltage. The meter should
indicate :- 20kV +0,7kV/-1kV 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 any X-Radiation possibility, it isessential
to use the specified tube.
HOT CHECK CIRCUIT
A.C. VOLTMETER
WATER PIPE
(EARTH)
TO INSTRUMENT’S EXPOSED
METALLIC PARTSFig. 1.
2kΩ10 Watts
2
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SERVICE HINTS
How toremove the rear cover
1. Removethe 7 screws as shown in Fig.2.
2. Push clips (A) and elevate lid.
3. Removethe 2 screws as shown in Fig.3.
LOCATION OF CONTROLS
3
SCREWS
Fig.2.
Fig.4.
Clips
(A)
SCREWS
Fig.3.
Q - Board
E - Board S 451
Vertical Position
Focus
Screen
Y - Board
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