Panasonic AG527DVDE - DVD/VCR/MONITOR User manual

ORDERNO. MKE0206606C1
D1
TV/DVD/VCR Combination
AG-527DVDE
SPECIFICATIONS
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2002 Matsushita Kotobuki Electronics Industries LTD. All rights
reserved. Unauthorized copying and distribution isaviolation of
law.
1. SAFETY PRECAUTIONS
1.1. GENERALGUIDELINES
1. IMPORTANTSAFETY NOTICE
There are special components used inthisequipment which are
important for safety. These parts are marked byinthe
SchematicDiagrams, CircuitBoard Layout, Exploded Viewsand
Replacement Parts List. Itisessential thatthese critical parts
shouldbe replaced with manufacturer’sspecified parts to prevent
X-RADIATION, shock, fire, or other hazards. Donot modifythe
original design without permission of manufacturer.
2. AnIsolation Transformer shouldalwaysbe used during the
servicing of Combination DVDVCR whose chassisisnot isolated
from the AC power line. Use atransformer of adequate power
rating as thisprotects the technician from accidents resultingin
personal injuryfrom electrical shocks. Itwill also protect
Combination DVDVCR from being damaged byaccidental
shorting that mayoccur during servicing.
3. When servicing, observe the original lead dress, especiallythe
lead dress inthe high voltage circuits. Ifashort circuitisfound,
replace all parts which have been overheated or damaged bythe
short circuit.
4. After servicing, see to itthat all the protective devices such as
insulation barriers, insulation papers, shield, and isolation R-C
combinations are properlyinstalled.
5. Before turning the receiver on, measure the resistance between B+
line and chassisground. Connect (-) side of an ohmmeter to the B
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+ lines, and (+)side to chassisground. Each line shouldhave
more resistance than specified,as follows:
B+ Line
Minimum Resistance
130 V
1k (Coldchassisground)
27 V
180 (Coldchassisground)
17 V
110 (Coldchassisground)
6. When the TV set isnot used for along period of time, unplug the
power cord from the AC outlet.
7. Potentials, as high as 34.5kV are present when thisTV set isin
operation. Operation of the TV set without the rear cover involves
the danger of ashock hazard from the TV set power supply.
Servicing shouldnot be attempted byanyone who isnot
thoroughlyfamiliar with the precautions necessarywhen working
on high voltage equipment. Alwaysdischarge the anode of the
picture tube to the CRTground of receiver before handling the
tube.
8. After servicing make the following leakage current checks to
prevent the customer from being exposed to shock hazards.
1.2. LEAKAGECURRENTCOLDCHECK
1. Unplug the AC cord and connect ajumper between the two
prongs on the plug.
2. For physicallyoperated power switches, turn power on. Otherwise
skipstep 2.
3. Measure the resistance value, with an ohmmeter, between the
jumpered AC plug and each exposed metalliccabinet part on the
receiver, such as screwheads, connectors, etc. When the exposed
metallicpart has areturn path to the chassis, the readingshould
be between 1M and 12 M . When the exposed metal does not
have areturn path to the chassis, the reading must be infinity.
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1.3. LEAKAGECURRENTHOTCHECK
1. Plug the AC cord directlyinto the AC outlet.
Donot use aisolation transformer for thischeck.
2. Connect a1.5k , 10 Wresistor, inparallel with a0.15 F
capacitor, between each exposed metallicpart on the set and a
good earth ground, as showninFigure 1.
3. Use an AC voltmeter, with 1k /Vor more sensitivity, to measure
the potential across the resistor.
4. Check each exposed metallicpart, and measure the voltage at
each point.
5. Reverse the AC plug inthe AC outlet and repeat each of the above
measurements.
6. The potential at anypoint shouldnot exceed 0.75 VRMS.
Aleakage current tester (Simpson Model 229 equivalent) maybe
used to make the hot checks. Leakage current must not exceed 1/
2mA. Incase ameasurement isoutside of the limits specified,
there isapossibilityof shock hazard, and thereceiver shouldbe
repaired and rechecked before itisreturned to the customer.
Figure 1
2. X-RADIATION
WARNING :
1. The potential source of X-Radiation inTV sets isthe High Voltage
section and the picture tube.
2. When using apicture tube test fixture for service, ensure that the
fixture iscapableof handling 34.5kV without causing X-Radiation.
NOTE:
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Itisimportant to use an accurate periodicallycalibrated high
voltage meter.
1. Reduce the brightness to minimum.
2. Set the SERVICEswitch to SERVICE.
3. Measure the High Voltage. The meter reading shouldindicate 32.0
kV±2.5kV.
Ifthe meter indication isout of tolerance, immediate service and
correction isrequired to prevent the possibilityof premature
component failure.
4. To prevent an X-Radiation possibly, itisessential to use the
specified picture tube.
2.1. HORIZONTALOSCILLATORDISABLE CIRCUITTEST
SERVICE WARNING :
The test must be made as a final check before set is returnedtothe customer.
1. With the rear cover removed, supplyabout a120 VAC power
source to the set, turn on the set.
2. Set the customer controlsto normal operating positions.
3. Short between TP891 and TP892 on the Maincircuitboard with a
jumper wire. Confirm that the picture goes out of horizontal sync.
4. Ifthisdoes not occur, the horizontal oscillator disablecircuitis
not operating. Follow the RepairProcedures of horizontal
oscillator disablecircuitbefore the set isreturned to customer.
2.2. REPAIRPROCEDURES OFHORIZONTALOSCILLATOR
DISABLE CIRCUIT
1. Connect aDC voltmeter between capacitor C513 (+)on the Main
circuitboard and chassisground.
2. Ifapproximately+21.5Visnot present at that point when 120 V
AC isapplied, find the cause. Check R503, R5505, C5507, C513
and D503.
3. Carefullycheck above specified parts and related circuits and
parts. When the circuitisrepaired, trythe horizontal oscillator
disablecircuittest again.
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