Panasonic NV-MV20GC Manuale utente

ORDERNO. MAVR0304004C8

VideoCassette Recorder

NV-MV20GC/ NV-MV20GCS/ NV-MV20GM/ NV-MV20GL / NV

-MV20EE / NV-MV20GCU / NV-MV20GCF / NV-MV20GH

R4-MECHANISM

SPECIFICATIONS

Unauthorizedcopying and distribution isaviolation oflaw.

1. INTRODUCTION

1.1. INTRODUCTION

This service manual contains technical information whichwill allowservice personnel to

understand and service this model.

Ifthe circuitis changedormodified, this information will be followedbysupplementaryservice

manual to be filedwith original service manual.

Note:

1. Adjustmentprocedures, DisassemblyProcedures and Assembly

Procedures for MechanismChassisareseparate volumefrom this

service manual.

Please refertotheservice manual for R4-MechanismChassis.

(OrderNo. VRD0202010C8)

2. TheModel No. isindicatedon theSchematicDiagramand Circuit

Board Diagramsas follows.

Model No. Indication Mark

NV-MV20GC/GCS/GM (A)

NV-MV20GL (B)

NV-MV20EE (C)

NV-MV20GCU/GCF (D)

NV-MV20GH (E)

1.2. ABOUTLEADFREE SOLDER(PbF)

Distinction of PbF PCB:

PCBs (manufactured) using leadfree solderwill have a PbF stamp on the PCB.

Caution:

-Pbfree solderhas ahighermelting pointthanstandard solder,

Typicallythemelting pointis50-70°F(30-40°C) higher. Please use

ahigh temperaturesoldering iron. Incase ofsoldering iron with

temperaturecontrol,please set itto700±20°F(370±10°C)

-Pbfree solderwill tend tosplashwhenheatedtoo high (about

1100°F/600°C).

Whensoldering orunsoldering, please completelyremove all of the solderon the pins orsolder

area, and be sure to heatthe soldering points with the Pbfree solderuntil itmelts enough.

2. GENERALDESCRIPTIONS

2.1. SERVICE CAUTION-1

Whenthe MicroprocessorIC6001 and/orBack-up batteryB7751 are replaced, readthe following

procedure carefullyand proceedit.

[REASONS]

There is a RAMinthe IC6001, whichis backing up:

1. ProgrammeNavigation Data [See NOTE1]

2. TV Tuning Data

3. PG ShifterAdjustmentData

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 into a VCR, you canconfirmthatthe NAVI data

thatis back up with IC6001 as showninthe following steps.

1. Indicate the"NAVI"markon theFrontInformation Panel. (Press

theMenu button and select theoption, thenset the"NAVI"toON

mode.)

2. Turn on theService Modeand press the"NAVI"button on the

Remote Controllerinmorethan5seconds. The"NAVI"data list is

displayedon theMonitor. (Press the"MENU"button on the

Remote Controllerfor cancellation.)

Although storedNAVI data canbe confirmedon the monitor, there is no wayto transferthe

NAVI data to IC6001whichis newlymounted.

2.1.1. REPLACINGPROCEDURE[IC6001]

[1.PREPARATION]

Before replacing IC6001:

1. Take note that storedTV broadcast channels. (Because, its user

maystoreTV broadcasts bymanuallyotherthan"AutoTuning"

operation and itisalsoerased.)

NOTE:

During servicing, do not make a shortcircuitbetweenIC6001-pin37 (5V)with otherline/

Components otherwise IC6001 maybe broken.

CAUTION:

*Whenreplacing theB7751, besuretoread/followthe"HOWTO

REPLACE THE LITHIUM BATTERY"section.

[2.REPLACINGPROCEDUREIN STEPS]

STEP1.PREPARATION

1. Disconnect theACplug beforeremoving theC.B.A. with

Mechanismunitbyreferring totheDisassemblyprocedure.

STEP2.REPLACETHEIC6001

1. Replace theIC6001. (Donotmake ashortcircuitbetweenIC6001-

pin37 and otherpins/ components.)

STEP3.RESETTHEIC6001 ATONCE

1. Connect theACplug.

2. Connect ajumperwirebetweenTL7510 (RESET)and TL7509

(GND) for asecond toreset theMicroprocessor IC6001.

Note:

Since the resistance atpin2 as well as pin3 of IC6001 decides the model distinction data, there

is no needto setup the Model code, whichis necessaryinthe previous models.

STEP4.LINE-IN SETTING& ACTIVATEPLUG-IN A.T.P.

(FOR OTHER THAN NV-MV20GL)

1. Press theChannel up and downkeyssimultaneouslyfor more

than3seconds, underthecondition oftheno tapeisintheunit.

2. Confirm that "AV"canbedisplayedon theFIP bypressing theCH

UP and CH DOWNbuttons.

NOTE:

If"DIRECTREC"on the OPTION setting screenis setto [ON], the input signal is fixedto "AV",

and the Channel up and downkeys are not effective.

3. Disconnect theACplug for fewsecondsand connect itagain,

and press POWERbutton for turning thepowertoon from off to

carryoutthe"Plug inAutoTunerPreset".

4. Since otherthanthechannelsthat canbestoredby"Auto

Tuning" operation arenotavailableyet, preset manuallyby

consulting thenote ofits availableTV channelsofwhichyou took

before.

NOTE:

The Factoryshipping condition of OSD setting is not restoredbyabove operation.

5. ChangetheOSDsetting totheFactoryshipping condition if

necessary, byreferring toOption Setting on theOperating

Instructionsas showninthefollowing chart.

STEP5.COMPATIBILITYADJUSTMENT

Referto the Electrical Adjustment Procedures.

2.2. CAUTIONFORACMAINS LEAD(NV-MV20GH)

2.3. HOWTO REPLACE THE LITHIUM BATTERY

2.3.1. GENERALDESCRIPTION

There is a RAMinthe 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. ProgrammeNavigation Data

2. TV Tuning Data

3. PG ShifterAdjustmentData

4. Option Setting Data

2.3.2. REPLACEMENT PROCEDURE

NOTE:

This work shouldbe finishedwithin30 minutes sothatthe RAMdata wouldnot be lostas

running out of current from the Back-up CapacitorC7752.

1. RemovetheTop Panel and MechanismunitwithMainC.B.Aby

referring totheDisassembling Procedure.

2. UnsoldertheLithium Battery:B7751 and thenreplace itwitha

newone(See Fig. B1 ).

Fig. B1

NOTE:

The lithium batteryis a critical component (ManufacturedbyPanasonic.)

Itmustneverbe subjectedto excessive heatordischarge.

Itmusttherefore onlybe fittedinequipment designedspecificallyforits use.

Replacement batteries mustbe of the same type and manufacture.

Theymustbe fittedinthe same mannerand location as the original battery, with the correct

polaritycontacts observed.

Donot attempt to re-charge the batteryorre-use itforanyotherpurpose.

Itshouldbe disposedof inwaste products destinedforburial ratherthanincineration.

2.4. SERVICE CAUTION-2

2.4.1. CAUTIONFORAUTOTUNING

PROCEDURE

Auto Tuning will startbythe following procedure.

1. Connect theDIN-RFCable.

2. Connect theACMainsLead.

3. Turn on theVCR.

AutoTuning will start.

AutoTuning searchfor TV stationsfrom VHS minimum toUHF

maximum and memorizes everytunedprogramposition. Other

programpositionsareskipped.

AutoTuning takes fiveor moreminutes tocomplete its search.

DonottouchtheVCR during AutoTuning.

AutoTuning will stop halfway, iftheVCR isoperatedor theaerial

leadand/or themainsleadaredisconnected.

Incase theVCR stoppedduring AutoTuning, theVCR has tobe

reset and restarted. See thefollowing item2.

NOTE:

1. IftheVCR isturnedon withtheantennanotconnected, all

channelsareskipped. Therefore, firmlyconnect theantennaand

thenturn theVCR off and on againtoexecute Autotuning.

2. WhenAutoTuning iscanceledhalfway, AutoTuning isnot

execute eveniftheVCR isturnedoff and thenturnedon again,

Inthiscase, AutoTuning has toberestartedbythefollowing

procedures.

A. Press EJECTand removetheVideocassette.

B. KeepUP and DOWNon theVCR pressedsimultaneouslyfor 3

secondsor moreduring theVCR on.

Thechannel displayedon theVCR displaydisappearsfor

momentthenchanges to2.

C. Turn off theVCR and thenturn iton. AutoTuning commences.

3. Ifyou turn theVCR off during AutoTuning, AutoTuning will stop

halfway.

TheVCR shouldbereset and restartedbytheitem2inorderto

execute AutoTuning.

4. IftheVCR starts playback during AutoTuning, AutoTuning will

stop halfway.

TheVCR shouldbereset and restartedbytheitem2inorderto

execute AutoTuning.

5. Tocancel AutoTuning Mid-operation, press POWERDuring Auto

Tuning (TheVCR isturnedoff).

6. WhentheVCR ismovedtotheotherarea or country, TV

broadcasts shouldbestoredagain.

2.4.2. CHECKINGOFMAINC.B.A.

Whenservicing the MAIN C.B.A., take out the MAIN C.B.A. and mechanismfrom the frame. Turn

the MAIN C.B.A. overas shownin Fig. S1 .

Fig. S1

2.4.3. REMOVALOFCASSETTETAPE

Whenthe cassette tape couldnot be uninstalledfrom anelectrical malfunction, There are 2

ways to remove a cassette tape.

1. Removal bycompulsoryunloading.

A. Press FF and EJECTbutton simultaneouslyfor morethan3

secondsand set theService Modeto7.

B. Press STOP button inordertounloadthemechanism. (Pay

attention totapeslack)

Service ModeIndication:

7** ** (STOP)70L** (EJECT)

2. Removal bymanual operation byrotating theLoading Motor with

thebatteries.

A. Disconnect theACplug, and removetheTop Panel and the

FrontPanel byreferring totheDisassemblyProcedures.

B. Connect three batteries (1.5V spec.)totheLoading Motor in

series for supplying 4.5V torotate theLoading Motor as shown

in Fig. S2 . Fig. S2

C. Stop unloading just beforeunloading wouldbecompletedas

shownin Fig. S3 . Fig. S3

D. Thenthetapebecomes slack as shownin Fig. S4 .

Fig. S4

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