Panasonic Omnivision PV-V4621 User manual

ORDERNO. MKE0101002C1
B3
Video Cassette Recorder
PV-V4621 / PV-V4621-K / PV-V4661-K
SPECIFICATIONS
2001 Matsushita-Kotobuki Electronics Industries Ltd. All rights
reserved. Unauthorized copying and distribution isaviolation of
law.
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1. PV-V4621 REPLACEMENT NOTE
There are 2 types of MainC.B.A. (E10) forPV-V4621.
VEPS6073HA is usedinearlyproducts and has beenchangedtoVEPS6073HC on running
change basis inlaterproducts. Whenreplacing MicrocontrollerIC (IC6001) orEEP ROM IC
(IC6005), be sure toconfirm whichMainC.B.A. is usedforthe unit you are servicing.
The parts usedforeachMainC.B.A. are as follows.
2. SAFETY PRECAUTIONS
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 that these critical parts
shouldbe replaced with manufacturer’sspecified parts to prevent
shock, fire or other hazards. Donot modifythe original design
without permission of manufacturer.
2. AnIsolation Transformer shouldalwaysbe used during the
servicing of VCR whose chassisisnot isolated from the AC power
line. Use atransformer of adequate power rating as thisprotects
the technician from accidents resulting inpersonal injuryfrom
electrical shocks. Itwill also protect VCR from being damaged by
accidental shorting that mayoccur during servicing.
3. When servicing, observe the original lead dress. Ifashort circuit
isfound, replace all parts which have been overheated or
damaged bythe short circuit.
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4. After servicing, see to itthat all the protective devices such as
insulation barriers, insulation papers shields are properly
installed.
5. After servicing, make the following leakage current checks to
prevent the customer from being exposed to shock hazards.
LEAKAGE CURRENTCOLD CHECK
1. Unplug the AC cord and connect ajumper between the two
prongs on the plug.
2. Measure the resistance value, with an ohmmeter, between the
jumpered AC plug and each exposed metalliccabinet part on the
equipment such as screwheads, connectors, control shafts, etc.
When the exposed metallicpart has areturn path to the chassis,
the reading shouldbe between 1M and 5.2M . When the
exposed metal does not have areturn path to the chassis, the
reading must be infinity.
LEAKAGE CURRENTHOTCHECK
(See figure 1.)
1. Plug the AC cord directlyinto the AC outlet. Donot use an
isolation 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. A
leakage current tester (Simpson Model 229 or equivalent) maybe
used to make the hot checks. Leakage current must not exceed 1/
2mA. Incase ameasurement isoutside of the limits specified,
there isapossibilityof ashock hazard, and the equipment should
be repaired and rechecked before itisreturned to the customer.
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Figure 1
3. PREVENTION OF ELECTRO-STATIC 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, some field-effect transistors and semiconductor"chip"
components. The following techniques shouldbe usedtohelpreduce the incidence of
component damage causedbyelectrostatic discharge (ESD).
1. Immediatelybefore handling anysemiconductor component or
semiconductor-equipped assembly, drainoff anyESDon your
bodybytouching aknownearth ground. Alternatively, obtainand
wear acommerciallyavailabledischarging ESDwrist strap, which
shouldremove electrostaticcharge 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 antistaticsolder removal device. Some solder
removal devices not classified as "antistatic(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
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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:
This reminderis providedtocall the CATV systeminstaller’s attention toArticle 820-22 of the
NEC that provides guidelines forpropergrounding and, inparticular, specifies that the cable
ground shall be connectedtothe grounding systemof the building, as close tothe point of
cable entryas 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
will be displayedinF.I.P.
The SimplifiedFault finding data is storedinthe MemoryIC (IC6005). This data is clearedafterit
is displayed, and thenthe POWER button is pressedback on.
1. With power turned off, press VCR/TV button on VCR (for over 3
seconds ifVCR isnot inshut off condition).
Fig. 1-1
2. Faultcode (4 digitnumber) will be displayed inF.I.P. as shown.
Fig. 1-2
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Fig. 1-3
Fig. 1-4
Fig. 1-5
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Fig. 1-6
3. Whilepressing VCR/TV button on VCR with power turned off,
press anyoperation button on either VCR, or remote to detect that
akeyhas been pressed.
The 1st digitchanges to "0" onlywhen keyisdetected.
Fig. 1-7
4. When 1to 4listed inLock code occurs, Lock data will be stored in
the EEPROMIC(Current data, Last Lock data, and the Last Lock
data before last). Lock data displayed inF.I.P. can be changed by
pressing CH DOWNbutton.
Fig. 1-8
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Note:
1. Lock data will be kept after the AC Cord isunplugged.
2. When 1to 4listed inLock code occurs for the first time, the VCR
does not go into VCR shut-off condition. Ifitoccurs againwithina
minute, the VCR goes into VCR shut-off condition. Then, the VCR
stops and all VCR function buttons except for power become non-
operational.
5.1.2. USAGE SCREEN MODE
Function displayedon the TV monitor:
-the total elapsed "Power on" time (indays)
-the total elapsed "Cylinder rotation" time (inhours)
1. With power turned on and no cassette, press VCR/TV button on
VCR and 7keyon remote together.
The USAGESCREENwill be displayed on the TV Monitor.
Fig. 3
Note:
1. After replacing the Cylinder Unit, press COUNTERRESET button
on remote inthismode. OnlyTotal elapsed "Cylinder rotation"
time (inhours) will be cleared to 0.
2. To release from Usage Screen Mode, press anyoperation button
on VCR or insert acassette tape inthismode. The VCR will return
to normal operation mode.
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5.1.3. EEPROM IC (IC6005), MAIN C.B.A. REPLACEMENTNOTE
Afterreplacing EEPROM IC (IC6005) orMainC.B.A., be sure toperform the "PG SHIFTER
ADJUSTMENT" inELECTRICALADJUSTMENTprocedures.
5.1.4. SERVICE POSITION
5.1.4.1. Service Position
CAUTION:
HOTCIRCUIT(Primarycircuit) exists on the MainC.B.A.
Use extreme care to prevent accidental shock when servicing.
5.1.4.1.1. Service Position (1)
Fig. 4-1
5.1.4.1.2. Service Position (2)
Fig. 4-2
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Note:
1. Itispossiblethat the S-Tab SW. maynot work correctlyinService
Position (2). (Recording can not be done). Inthiscase, short the S-
Tab SW. Pins on the foil side of the MainC.B.A. to turn thisSW.
on. Fig. 4-3
2. Place the tape between the Cassette UpAss’yand MainC.B.A. to
get astability.
3. When disassembling/assembling, refer to "CABINET SECTION"in
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