Panasonic PVDM2092 - MONITOR/DVD COMBO User manual

ORDERNO. MKE0207607C1
B22
TV/DVD/VCR Combination
PV-DM2092 / PV-DM2092-K
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
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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
+ 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)
210 V
1k (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 30.0kV 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
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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.
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
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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:
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 28.5
kV±1.5kV.
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.
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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.
2.3. CIRCUITEXPLANATION
2.3.1. HORIZONTALOSCILLATOR DISABLE CIRCUIT
The positive DC voltage, suppliedfromthe D503 cathode formonitoring high voltage, is applied
tothe IC5301 Pin11 through R503 and R5504. Undernormal conditions, the voltage at IC5301
Pin11 is less thanapprox. 3 V. If the high voltage at FlybackTransformerPin5 exceeds the
specifiedvoltage, the positive DC voltage whichis suppliedfromthe D503 cathode also
increases. The increasedvoltage is appliedtoIC5301 Pin11 through R503 and R5504. Due tothe
increasedvoltage at IC5301 Pin11,the horizontal oscillatorfrequencyincreases, the picture goes
out of horizontal sync, the beamcurrent decreases and the picture become dark inorderto
keepX-radiation underspecification.
Figure 2
2.4. LASERPRODUCT
CLASS I LASER PRODUCT
-Thisequipment iscertified to complywith DHHSRules 21 CFR
Chapter 1, Subchapter Jineffect as of date of manufacture. (Only
for U.S.A.)
This equipment is classifiedas a Class I (Class 1) level LASER Product and there is no
hazardous LASER radiation withthe safetyprotection.
Caution:
Use of controlsor adjustments or performance of procedures other
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than those specified hereinmayresultinhazardous radiation
exposure.
Nevertouchthe internal parts inordertoavoidEXPOSURE TO VISIBLE LASER RADIATION.
Unplug the AC powercordtothe equipment whenopening the top cover.
Whenthe powerswitchis On, do not place youreyes close tothe front panel opening dooror
the otheropenings tolook intothe interiorunit.
LASER Specification
Class I level A LASER Product (Class 1 level A LASER Product)
Wave Length:
647 -677 nm (at DVD)
775 -815 nm (at CD)
Laser Power:
Nohazardous radiation isemitted with the safetyprotection.
2.5. PRECAUTIONOFLASERDIODE
CAUTION:
Thisunitutilizes aclass III alaser. Visiblelaser radiation isemitted
from the optical pickup lens when the unitisturned on:
1. Donot look directlyinto the pickup lens.
2. Donot use optical instruments to look at the pickup lens.
3. Donot adjust the preset variableresistor on the optical pickup.
4. Donot disassemblethe optical pickup unit.
5. Ifthe optical pickup isreplaced, use the manufactures specified
replacement pickup only.
6. Use of control or adjustment or performance of procedures other
than those specified hereinmayresultinhazardous radiation
exposure.
3. PREVENTION OF ELECTROSTATIC DISCHARGE
(ESD) TO ELECTROSTATICALLY SENSITIVE (ES)
DEVICES
Some semiconductor(solidstate) devices canbe damagedeasilybystatic electricity. Such
components commonlyare calledElectrostaticallySensitive (ES) Devices. Examples of typical
ES devices are integratedcircuits and some field-effect transistorsare semiconductor"chip"
components. The following techniques shouldbe usedtohelpreduce the incidence of
component damage causedbyelectrostatic discharge (ESD).
1. Immediatelybefore handling anysemiconductor component or
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semiconductor-equipped assembly, drainoff anyESDon your
bodytouching aknownearth ground. Alternatively, obtainand
wear acommerciallyavailabledischarging ESDwrist strap,
whichshouldbe removed for potential shock reasons prior to
applying power to the unitunder test.
2. After removing an electrical assemblyequipped with ES devices,
place the assemblyon aconductive surface such as aluminum
foil, to prevent electrostaticcharge buildup or exposure of the
assembly.
3. Use onlyagrounded-tipsoldering iron to solder or unsolder ES
devices.
4. Use onlyan anti-staticsolder removal device. Some solder
removal devices not classified as "anti-static(ESDprotected)"
can generate electrical charge sufficient to damage ES devices.
5. Donot use freon-propelled chemicals. These can generate
electrical charges sufficient to damage ES devices.
6. Donot remove areplacement ES device from its protective
package until immediatelybefore you are readyto install it. (Most
replacement ES devices are packaged with leads electrically
shorted together byconductive foam, aluminum foil or
comparableconductive material).
7. Immediatelybefore removing the protective material from the
leads of areplacement ES device, touch the protective material to
the chassisor circuitassemblyinto which the device will be
installed.
CAUTION:
Besure no power isapplied to the chassisor circuit, and observe
all other safetyprecautions.
8. Minimize bodilymotions when handling unpackaged replacement
ES devices. (Otherwise harmless motion such as the brushing
together of your clothes fabricor the lifting of your foot from a
carpeted floor can generate staticelectricity(ESD)sufficient to
damage an ES device).
"NOTE toCATV systeminstaller:
Thisreminder isprovided to call the CATV system installer’s
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attention to Article820-40 of the NECthat provides guidelines for
proper grounding and, inparticular, specifies that the cableground
shall be connected to the grounding systemof the building, as
close to the point of cableentryas practical."
4. OPERATION GUIDE
5. SERVICE NOTES (PLEASE READ)
5.1. SERVICENOTES
5.1.1. SIMPLIFIED FAULT FINDING DATA
SimplifiedSelf-Diagnostic Systemfacilitates finding the cause of the fault. A 4 digit fault code
and communication forI2C bus code will be displayedon TV screen.
The SimplifiedFault finding data is storedinthe MemoryIC (IC6004). This data is clearedafterit
is displayed, and thenthe POWER button is pressedback on.
1. With power turned off, press FF and REW buttons on unit
together for over 3seconds. Fig. 1-1
2. TV power comes on and the unitgoes into service mode.
4digitfor faultcode and communication for I2Cbus code will be
displayed. Fig. 1-2
Fig. 1-3
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Fig. 1-4
Fig. 1-5
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