Panasonic NV-SJ400A User manual

ORDERNO. VRD0006020C3

Video Cassette Recorder

NV-SJ400A / NV-SJ200A

Z-MECHANISM

SPECIFICATIONS

Unauthorized copying and distribution isaviolation of law.

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 Z-

Mechanism Chassis. (Order No. VRD9802005C2)

2. The Model No. isindicated on the SchematicDiagram and Circuit

Board Diagrams as follows.

Model No. Indication Mark

NV-SJ400A (SJ400)

NV-SJ200A (SJ200)

2. GENERAL DESCRIPTIONS

2.1. SERVICEINFORMATION

2.1.1. MICROPROCESSOR RESET

Whenthe MicroprocessorIC6001, MAIN C.B.A. and/orBack-up BatteryB6001 are replaced, read

following procedure carefullyand proceedit.

Reasons:

There is a RAM inthe IC6001, whichis backing up:

1. TV Tuning Data.

2. PG shifter Adjustment Data

3. Option Setting Data

WhenIC6001, MAIN C.B.A. and/orBack-up BatteryB6001 are replaced, all above listeddata

become not available.

These data are backing up byusing the powersource of:

AC connected: AC Powersource

AC Disconnected: Back-up BatteryB6001

Method:

Before replacing IC6001, MAIN C.B.A. and/orB6001:

1. Take anote that stored TV broadcasts channels.(Because , its

user maystore TV broadcasts bymanuallyother than "Auto

Tuning" operation and itisalso erased.)

Afterreplacing IC6001, MAIN C.B.A. and/orB6001:

1. Turn on the VCR.

2. Connect ajumper wire between TL7509 and TL7510 for 1second

to reset IC6001.

Afterresetting IC6001:

1. Store TV broadcasts channelsbyAuto/Manual Tuning using the

OnScreen Displayaccording to note which taken before replacing

IC6001, MAINC.B.A. and/or B6001.

2. Set the Direct Rec function to OFF using OnScreen Displayif

necessary. / (Because, Direct Rec function isset automaticallyto

ONafter resetting IC6001.)/ [Direct Rec Function] / OFF: Normally

set at thisposition. / ON:Thissettingenables Direct Rec. / AV1

Input(A1) becomes exclusive channel for Direct Rec.

3. Perform the PG SHIFTERADJUSTMENT. / (Refer to the Electrical

Adjustment Procedures.)

Note:

1. Itshouldbe performed before tuning.

2. Donot cut off the power source during reset.

Fig. S1

2.1.2. CYLINDER UNITREPLACEMENT

1. CYLINDERUNITREPLACEMENT

A. Remove the mechanism unitfrom MAINC.B.A./Chassisby

referring“SECTION3. DisassemblyMethod”.

B. Remove the 3screws(A)of the CYLINDERUNITwith ascrew

driver.

C. Unlock the 4locking tabs (B)and disconnect the Cylinder

fiexiblecard from the FPCHolder.

D. Remove the CYLINDERUNIT.

CAUTION:

Handlethe Cylinder flexiblecard with care. When itdamaged, you

shouldreplace wholeCylinder unit.

Fig. S2

2. UPPERCYLINDERDISASSEMBLY

A. Remove 2screws(A).

B. Remove the Cylinder Stator Unit.

C. Remove 2screws(B).

D. Remove the Cylinder Rotor Unit.

E. Loose Hex screw (C)(1.5mm) and remove the CYLINDER

RETAINER.

F. Remove the Upper Cylinder. Fig. S3

3. UPPERCYLINDERASSEMBLY

When reassembling, perform the steps inthe reverse order.

Notes:

1. Install the Cylinder Retainer so that the 2holes on top of the

Cylinder Retainer are at right angles with the Cylinder Connection.

2. Tighten the Hex screw (C)(1.5mm) whilepressing downon top of

the Cylinder Retainer. Fig. S4

3. Install the Cylinder Rotor Unitso that the inner holeof the

Cylinder Rotor Unitfits to the small projection (D)on top of the

Upper Cylinder.

4. Tighten 2screws(B). Fig. S5

5. Install the Cylinder Stator Unitso that the rear side of the Cylinder

Stator C.B.A. isparallel with the Cylinder Connection.

6. Tighten 2screws(A). Fig. S6

7. Confirm the PG SHIFTERADJUSTMENTwith the alignment tape

(PAL: VFJ8125H3F) and adjust itifnecessary.

2.1.3. CHECKING OFMAIN C.B.A.

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

turnover.

Fig. S7

2.1.4. FLATCARD CABLE INSTALLATION

Wheninstalling the Flat CardCable on the connector, install the Flat CardCable withthe cable

contacts facing the connectorcontacts.

Fig. S8

2.2. REMOVALOFCASSETTE TAPE

There are 2 ways toremove a cassette tape.

1. Service Information DisplayOperation

A. Press the FF and EJECTkeyssimultaneoslyfor 3seconds and

set the Service Mode 7.

B. Press STOPkeyinorder to rotate the Loading Motor for

unloading operation. (Payan attention of tape slack)

2. Manual Operation

A. Disconnect the AC Mains Lead and remove the Top Panel.

B. Rotate the MainCam Gear clockwise until the Loading Posts

move to fullyunloaded position as showninFig. S9. (Tape is

remaining) Fig. S9

C. Rotate the Capstan Motor clockwise from the bottom side to

take up the tape. Fig. S10

D. Rotate the MainCam Gear clockwise until the cassette tape is

ejected.

2.3. INTRODUCTIONOFVIDEO HEAD CLEANING CASSETTE /

(POLISHING TYPE)

1. We are pleased to introduce PanasonicVideo Head Cleaning

Cassette,VFK0923FT [for service purposes] andVFK0923FSE [for

end users] for all VHS/SVHSVCPand VCR.

2. These cleaning cassettes are exclusive removing the hard and

stickyclogging on video heads.

3. These improve the efficiencyof video head cleaning service and

shortening cleaning time for end users.

VFK0923FT

(ForService usage)

Type of Cassette Full VHS Cassette

Cleaning Time 10 Seconds/Time

Tape Length 20 m

Usabilityina Path 180 Times

VFK0823FSE

(Forend users)

Type of Cassette Full VHS Cassette

Cleaning Time 10 Seconds/Time

Tape Length 3.34 m

Usabilityina Path 30 Times

Note:

The tape material itselfisthe same inboth types.

3. ADJUSTMENT PROCEDURES

3.1. DISASSEMBLY METHOD

3.1.1. DISASSEMBLY FLOW CHART

This flowchart indicates disassemblysteps of the cabinet parts and the circuit boards inorder

tofind the necessaryitems forservicing.

Whenreassembling, perform the steps inthe reverse order.

Fig. D1

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