Panasonic NV-VP31GL User manual

ORDERNO. MAV0309001C3
DVDPlayer/ Video Cassette Recorder
NV-VP31GL / NV-VP31GC / NV-VP31GCS
R4-MECHANISM
SPECIFICATIONS
1

2003 Matsushita ElectricIndustrial Co., Ltd. All rights reserved.
Unauthorized copying and distribution isaviolation of law.
2

1. INTRODUCTION
1.1. INTRODUCTION
This service manual contains technical information whichwill allowservice personnel to
understand and service this model.
If the circuit is changedormodified, this information will be followedbysupplementaryservice
manual tobe filedwithoriginal service manual.
Note:
1. Adjustment procedures, DisassemblyProcedures and Assembly
Procedures for Mechanism Chassisare separate volume from this
service manual.
Please refer to the service manual for R4-Mechanism Chassis.
(Order No. VRD0202010C8)
2. The Model No. isindicated on the SchematicDiagram and Circuit
Board Diagrams as follows.
Model No. Indication Mark
NV-VP31GL (GL)
NV-VP31GC (GC)
NV-VP31GCS (GCS)
1.2. ABOUTLEAD FREE SOLDER(PbF)
Distinction of PbF PCB:
PCBs (manufactured) using leadfree solderwill have a PbF stampon the PCB.
Caution:
-Pb free solder has ahigher melting point than standard solder,
Typicallythe melting point is50-70°F (30-40°C)higher. Please use
ahigh temperature soldering iron. Incase of soldering iron with
temperature control,please set itto 700±20°F (370±10°C)
-Pb free solder will tend to splash when heated too high (about
1100°F/600°C).
Whensoldering orunsoldering, please completelyremove all of the solderon the pins orsolder
area, and be sure toheat the soldering points withthe Pbfree solderuntil it melts enough.
2. SAFETY PRECAUTIONS
3

2.1. GENERALGUIDELINES
1. When servicing, observe the original lead dress. Ifashort circuit
isfound, replace all parts which have been overheated or
damaged bythe short circuit.
2. After servicing, confirm that all the protective devices such as
insulation barriers, insulation papers shields are properly
installed.
3. After servicing, do the following leakage current checks to
prevent the customer from being exposed to shock hazards.
2.1.1. 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 thechassis,
the reading shouldbe between 1M and 5.2M .
When the exposed metal does not have areturn path to the
chassis, the reading must be .
Figure 1
2.1.2. 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 watts resistor, inparallel with a0.15 F
capacitors, between each exposed metallicpart on the set and a
good earth ground such as awater pipe, as shownin Figure 1 .
3. Use an AC voltmeter, with 1000 ohms/voltor more sensitivity, to
measure the potential across the resistor.
4

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 volts RMS. A
leakage current tester (Simpson Model 229 or equivalent) maybe
used to do the hot checks, leakage current must not exceed 1/2
milliamp. Incase ameasurement isoutsideof the limits specified,
there isapossibilityof ashock hazard, therefore the equipment
shouldbe repaired and rechecked before itisreturned to the
customer.
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 and some field-effect transistorsand 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 acommerciallyavailabledischargingESDwrist strap, which
shouldbe 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 alminum 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

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, alminum 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).
4. PRECAUTION OF LASER DIODE
6

7

8

5. PREVENTION OF STATIC ELECTRICITY
DISCHARGE
The laserdiode inthe traverse unit (optical pickup) maybreak downdue tostatic electricityof
clothes orhumanbody. Use due caution toelectrostatic break downwhenservicing and
handling the laserdiode.
9

5.1. Grounding for electrostaticbreakdownprevention
Some devices suchas the DVD playeruse the optical pickup (laserdiode) and the optical
pickup will be damagedbystatic electricityinthe working environment. Proceedservicing
works underthe working environment where grounding works is completed.
5.1.1. Worktablegrounding
1. Put aconductive material (sheet) or iron sheet on the area where
the optical pickup isplaced, and ground the sheet.
5.1.2. Human bodygrounding
1. Use the anti-staticwrist strap to discharge the staticelectricity
form your body.
5.1.3. Handling of optical pickup
1. Inorder to keep the optical pickup ingood quality, during
transporting and before installing, both ends of the laser diode
are to be shortcircuited. After replacing the part with anew one,
remove the short circuitaccording to the correctprocedure. (
Refer to thisService manual )
2. Failure to do so will damage the laser diode due to the external
current surge from the power supplyinthe tester.
5.2. Handling Precautions for Traverse Unit(Optical Pickup)
1. Donot give aconsiderableshock to the traverse unit(optical
pickup) as ithas an extremelyhigh-precise structure.
2. When replacing the optical pickup, install the flexiblecableand
cut its short land with anipper. Refer to the optical pickup
replacement procedure inthisService Manual. Before replacing
the traverse unit, remove the short pinfor preventingstatic
electricityand install anew unit. Connect the connector as soon
as possible.
3. The flexiblecablemaybe cut off ifan excessive force isapplied to
10

it. Use caution when handling the cable.
4. The half-fixed resistor for laser power adjustment shall not be
adjusted. Donot turn the resistor.
6. GENERAL DESCRIPTION
6.1. OPERATING INSTRUCTIONS
6.2. SERVICECAUTION-1
Whenthe MicroprocessorIC6001 and/orBack-up batteryB7751 are replaced, readthe following
procedure carefullyand proceedit.
[REASONS]
There is a RAM inthe IC6001, whichis backing up:
1. Programme Navigation Data [See NOTE1]
2. TV Tuning Data
3. PG Shifter Adjustment Data
4. Option Setting Data
WhenIC6001 are replaced, all above listeddata become not available.
These data is backedup byusing the powersource of:
*AC Connected: AC Powersource
*AC Disconnected: Back-up Battery(B7751) & Back-up Capacitor(C7752)
[NOTE1]
As foryourreference, without inserting a tape intoa VCR, you canconfirm that the NAVI data
that is backedup byIC6001 as showninthe following steps.
1. Press the Menu button and select the option, then set the "NAVI"
to ONmode.
2. Turn on the Service Mode and press the "NAVI"button on the
Remote Controller inmore than 5seconds. The "NAVI"data list is
displayed on the Monitor. (Press the "MENU"button on the
Remote Controller for cancellation.)
Although storedNAVI data canbe confirmedon the monitor, there is no waytotransferthe
NAVI data toIC6001 whichis newlymounted.
6.2.1. REPLACING PROCEDURE [IC6001]
[1.PREPARATION]
Before replacing IC6001:
11

1. Benoted that stored TV broadcast channelsmight be erased.
(Because the user mayhave stored TV broadcast manuallyrather
than using "Auto Tuning". )
NOTE:
During servicing, do not make a short circuit betweenIC6001-pin37 (5V) withotherline/
Components otherwise IC6001 maybe broken.
CAUTION:
*When replacing the B7751, be sure to read/follow the "HOWTO
REPLACETHELITHIUMBATTERY" section.
[2.REPLACING PROCEDURE IN STEPS]
STEP1.PREPARATION
1. Disconnect the AC plug before removing the C.B.A. with
Mechanism unitbyreferring to the Disassemblyprocedure.
STEP2.REPLACE THE IC6001
1. Replace the IC6001. (Donot make ashort circuitbetween IC6001-
pin37 and other pins/Components.)
STEP3.RESETTHE IC6001 ATONCE
1. Connect the AC plug.
2. Connect ajumper wire between TL7510 (RESET) and TL7509
(GND)for asecond to reset the Microprocessor IC6001.
Note:
12

Since the resistance at pin2 of IC6001 decides the model distinction, there is no needtoset up
the Model code, whichis necessaryinthe previous models.
STEP4.LINE-IN SETTING & ACTIVATE PLUG-IN A.T.P.
(FOR OTHER THAN NV-VP31GL)
1. Press the Channel up and downkeyssimultaneouslyfor more
than 3seconds until the channel on the unit’sdisplaychanges to
1, under the condition of the no tape isinthe unit.
2. Confirm that "A1" and "A2" can be displayed on the FIPby
pressing the CH UPand CH DOWNbuttons.
3. Disconnect the AC plug for few seconds and connect itagain, and
press POWERbutton for turning the power to on from off to carry
out the "Plug inAuto Tuner Preset".
4. Since other than the channelsthat can be stored by"Auto
Tuning" operation are not availableyet, preset manuallyby
consulting the note of its availableTV channelsof which you took
before.
STEP5.TAPE INTERCHANGEABILITY ADJUSTMENT
Refertothe Electrical Adjustment Procedures.
6.3. CAUTIONFORAC MAINSLEAD (NV-VP31GC)
6.4. HOWTO REPLACETHELITHIUMBATTERY
6.4.1. GENERALDESCRIPTION
There is a RAM inthe IC6001, whichis backing up the following data byusing the powersource
of B7751 (Back-up Battery) and C7752 (Back-up Capacitor: Back-up time is approximately30
minutes).
1. Programme Navigation Data
2. TV Tuning Data
3. PG Shifter Adjustment Data
4. Option Setting Data
13

6.4.2. REPLACEMENTPROCEDURE
NOTE:
This work shouldbe finishedwithin30 minutes sothat the RAM data wouldnot be lost as
running out of current fromthe Back-up CapacitorC7752.
1. Remove the Top Panel and Mechanism unitwith MainC.B.Aby
referring to the Disassembling Procedure.
2. Unsolder the Lithium Battery:B7751 and then replace itwith a
new one (See Fig. B1).
NOTE:
The lithiumbatteryis a critical component.
It must neverbe subjectedtoexcessive heat ordischarge.
It must therefore onlybe fittedinequipment designedspecificallyforits use.
Replacement batteries must be of the same type and manufacture.
Theymust be fittedinthe same mannerand location as the original battery, withthe correct
polaritycontacts observed.
Donot attempt tore-charge the batteryorre-use it foranyotherpurpose.
It shouldbe disposedof inwaste products destinedforburial ratherthanincineration.
14

6.5. SERVICECAUTION-2
6.5.1. CAUTION FOR AUTO TUNING
PROCEDURE
AutoTuning will start bythe following procedure.
1. Connect the DIN-RFCable.
2. Connect the AC Mains Lead.
3. Turn on the VCR.
Auto Tuning will start.
Auto Tuning search for TV stations from VHSminimum to UHF
maximum and memorizes everytuned program position. Other
program positions are skipped.
Auto Tuning takes five or more minutes to complete its search.
Donot touch the VCR during Auto Tuning.
Auto Tuning will stop halfway, ifthe VCR isoperated or the aerial
lead and/or the mains lead are disconnected.
Incase the VCR stopped during Auto Tuning, the VCR has to be
reset and restarted. See the following item 2.
15

NOTE:
1. Ifthe VCR isturned on with the antenna not connected, all
channelsare skipped. Therefore, firmlyconnect the antenna and
then turn the VCR off and on againto execute Auto tuning.
2. When Auto Tuning iscanceled halfway, Auto Tuning isnot
execute even ifthe VCR isturned off and then turned on again,
Inthiscase, Auto Tuning has to be restarted bythe following
procedures.
A. Press EJECTand remove the Videocassette.
B. Keep UPand DOWNon the VCR pressed simultaneouslyfor 3
seconds or more during the VCR on.
The channel displayed on the VCR displaydisappears for
moment then changes to 1.
C. Disconnect the AC mains lead and the reconnect it.
D. Turn on the unit. Auto Tuning commences.
3. Ifyou turn the VCR off during Auto Tuning, Auto Tuning will stop
halfway.
The VCR shouldbe reset and restarted bythe item 2inorder to
execute Auto Tuning.
4. Ifthe VCR starts playback during Auto Tuning, Auto Tuning will
stop halfway.
The VCR shouldbe reset and restarted bythe item 2inorder to
execute Auto Tuning.
5. To cancel Auto Tuning Mid-operation, press POWERDuring Auto
Tuning (The VCR isturned off).
6. When the VCR ismoved to the other area or country, TV
broadcasts shouldbe stored again.
6.5.2. CHECKING OFMAIN C.B.A.
Whenservicing the MAIN C.B.A., take out the MAIN C.B.A. and mechanismfromthe frame. Turn
the MAIN C.B.A. overas shownin Fig. S1 .
Fig. S1
16

6.5.3. REMOVALOFCASSETTE TAPE
Whenthe cassette tape couldnot be uninstalledfromanelectrical malfunction, There are 2
ways toremove a cassette tape.
1. Removal bycompulsoryunloading.
A. Press FF and EJECTbutton simultaneouslyfor more than 3
seconds and set the Service Mode to 7.
B. Press STOPbutton inorder to unload the mechanism. (Pay
attention to tape slack)
Service Mode Indication:
7** ** (STOP) 70L ** (EJECT)
2. Removal bymanual operation byrotating the Loading Motor with
the batteries.
A. Disconnect the AC plug, and remove the Top Panel and the
Front Panel byreferring to the DisassemblyProcedures.
B. Connect three batteries (1.5V spec.)to the Loading Motor in
series for supplying 4.5V to rotate the Loading Motor as shown
in Fig. S2 . Fig. S2
17

C. Stop unloading just before unloading wouldbe completed as
shownin Fig. S3 . Fig. S3
D. Then the tape becomes slack as shownin Fig. S4 .
Fig. S4
E. Rotate the S-Reel byasmall minus screwdriver (Fig. S5 )to
remove the slack tape as shownin Fig. S6 .
Fig. S5
Fig. S6
18

F. Then unload againto remove the cassette tape as shownin Fig.
S7 . Fig. S7
3. Removal bymanual operations after uninstalling the
mechanism,refer to the DISASSEMBLY METHODof item 3.1.
A. Disconnect the AC plug, and remove the Top Panel, Front
Panel and the Mechanism byreferring to the Disassembly
Procedures.
B. Remove the Screw (S1) and remove the Loading Motor both as
shownin Fig. S8 . Fig. S8
C. Rotate the MainCam Gear counter-clockwise (Fig. S9 )until
just before the unloading wouldbe completed as shownin Fig.
19

S3 .
D. Rotate the Capstan Motor clockwise (Fig. S9 )to remove the
slack tape as shownin Fig. S6 .
Fig. S9
E. Rotate the MainCam Gear counter-clockwise again(Fig. S9 )to
remove the cassette-tape as shownin Fig. S7 .
F. Set the Position Switch to EJECTPOSITIONcertainlyas shown
in Fig. S10 . Fig. S10
G. Install the Loading Motor and tighten screw (S1) as shownin
Fig. S8 .
6.5.4. CYLINDER UNITREPLACEMENT
NOTE:
Since securing of RTgapis impossible tobe done outside the factory, do not replace only
replace the UpperCylinderunit of R4 Mechanism, please replace the whole CylinderUnit witha
20