Panasonic NV-SJ400A User manual

ORDERNO. VRD0006020C3
Video Cassette Recorder
NV-SJ400A / NV-SJ200A
Z-MECHANISM
SPECIFICATIONS
2000 Matsushita ElectricIndustrial Co., Ltd. All rights reserved.
Unauthorized copying and distribution isaviolation of law.
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 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
2

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
3

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).
4

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:
5

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
6

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
7

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
8

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
9

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
10

3.1.2. DETAILOFDISASSEMBLY METHOD
1. REMOVALOFTHETOPPANEL
Remove 2 Screws (A)
Fig.D2
2. REMOVALOFTHEFRONTPANEL UNIT
Unlock 7 Tabs (B)
Fig. D3
11

3. REMOVALOFTHEMECHANISM UNIT
Remove Screw(C)
Remove 3 Screws (D)
Remove 2 Screws (E)
Note:
1. Keep pressing 2stoppers on Cassette Holder Plate and Press
Cassette Holder Plate to the rear.
2. Remove the Mechanism Unitafter bend the Cylinder Shieldinthe
direction of the arrow.
Fig. D4
4. REMOVALOFTHEMAINC.B.A.
12

Remove AC CORD HOLDER
Remove 4 Screws (F)
Unlock 4 Tabs (G)
Fig. D5
5. SERVICING POSITION Fig. D6
3.2. MECHANICALADJUSTMENTPROCEDURES
Refertothe Service Manual forZ-MechanismChassis. / (OrderNo. VRD9802005C2)
3.3. ELECTRICALADJUSTMENTPROCEDURES
3.3.1. PG SHIFTER ADJUSTMENT/ (AUTOMATIC)
13

PROCEDURES FIP Display
Press the FF and EJECTkeys
simultaneouslyfor3 seconds.
Press the FF and EJECTkeys
simultaneouslymore twice.
Press the EJECTkeyfor3
seconds.
Insert the Alignment Tape.
(PAL: VFJ81215H3F)
(NTSC: VFM8080HQFP)
This adjustment is
automaticallystarted. (During
the adjustment, the picture will
be appearedon the monitor.)
Whenthis Adjustment is terminated, the following
operation will be activated.
-Adjustmentcompleted:Thetapewill beejected.
-Adjustmentincompleted:"F2*" isindicated on theFIP.Check theServo/
System Control circuitand Cylinder Unit.
To release Service Mode, press the FF and EJECT
keys.
simultaneously6 times until the normal indication
on the FIP.
Fig. E1
4. ABBREVIATIONS
5. INPUT/OUTPUT CHART
5.1. INPUT/OUTPUTCHARTFORIC6001
Fig. MP1
Fig. MP2
Fig. MP3
6. WAVEFORM TABLE
7. BLOCK DIAGRAMS
7.1. SYSTEM CONTROL&SERVO BLOCK DIAGRAM
7.2. LUMINANCE&CHROMINANCEBLOCK DIAGRAM
14

8. SCHEMATIC DIAGRAMS
8.1. POWERTRANSFORMERSCHEMATICDIAGRAM
8.2. POWERSUPPLY/RFSECTIONINMAINSCHEMATICDIAGRAM
8.3. TIMERSECTIONINMAINSCHEMATICDIAGRAM
8.4. SYSTEM CONTROL&SERVO SECTIONINMAINSCHEMATIC
DIAGRAM
8.5. LUMINANCE&CHROMINANCE/AUDIO SECTIONINMAIN
SCHEMATICDIAGRAM
8.6. HEAD AMP SECTIONINMAINSCHEMATICDIAGRAM
8.7. CYLINDERSTATORUNITSCHEMATICDIAGRAM
8.8. CAPSTAN UNITSCHEMATICDIAGRAM
9. CIRCUIT BOARD ASSEMBLIES
9.1. MAINC.B.A.
9.2. CYLINDERSTATORUNIT
10. EXPLODED VIEWS
10.1. CHASSISPARTS SECTION
15

10.2. CASING PARTS SECTION
16

10.3. PACKING PARTS SECTION
17

18

11. REPLACEMENT PARTS LIST
11.1. CHASSISPARTS SECTIONPARTS LIST
Ref. No. PartNo. PartName& Description Pcs Remarks
1 (1) VEG1550 CYLINDER UNIT 1 NV-SJ400A
1(1) VEG1549 CYLINDER UNIT 1 [SUPPLIED FROMMAV]
NV-SJ200A
2 (1) VXP2052 UPPER CYLINDER UNIT 1 NV-SJ400A
2(1) VXP1972 UPPER CYLINDER UNIT 1 [SUPPLIED FROMMAV]
NV-SJ200A
3 (1) VDB1256 CYLINDER RETAINER 1
4 (1) VEM0715 CYLINDER MOTOR UNIT 1
6 (1) VXS0135 EARTH BRUSH UNIT 1
7 (1) VMD3795 FLATCABLEHOLDER 1 NV-SJ400A
7(1) VMD3796 FLATCABLEHOLDER 1 [SUPPLIED FROMMAV]
NV-SJ200A
10 (1) VEK9069 CAPSTAN UNIT 1
11 (1) VBS0155 FEHEAD 1
12 (1) VDB1431 TENSION ARMBOSS 1
13 (1) VDB1460 SUPPLYBRAKEARMBOSS 1
14 (1) VDG1220KIT MAIN CAMGEAR 1
15 (1) VDG1221 CONVERSION GEAR 1
16 (1) VDR0350 SUPPLYREEL TABLE 2
18 (1) VDV0382 CAPSTAN BELT 1
19 (1) VED0412 A/C HEAD UNIT 1
20 (1) VMX2656 P4CAP 1
21 (1) VDG1217 WORMGEAR 1
22 (1) VDG1218 WORMWHEEL GEAR 1
23 (1) VDG1219 CENTREGEAR 1
24 (1) VEM0604 LOADING MOTOR UNIT 1
25 (1) VMD2619 MOTOR BRACKET 1
26 (1) VMB3045 CONVERSION GEAR SPRING 1
27 (1) VMD2620 OPENER PIECE 1
28 (1) VMD2738 LED PRISM 1
29 (1) VML3165 DRIVE RACK ARM 1
30 (1) VML3166 MAIN LEVER 1
31 (1) VML3167 DRIVE MAIN LEVER ARM 1
32 (1) VML3172 SUPPLYSPRING ARM 1
33 (1) VML3176 CONVERSION LEVER A 1
34 (1) VML3177 CONVERSION LEVER B 1
35 (1) VXA6040 INCLINED BASE (S)UNIT 1
37 (1) VXA5854 INCLINED BASE (T)UNIT 1
38 (1) VXP1891 ROLLER POST 2
39 (1) VMA9672 SUPPORTANGLE 1
19

Ref. No. PartNo. PartName& Description Pcs Remarks
41 (1) VXL2667 TAKEUPBRAKEARMUNIT 1
43 (1) VXL2670 TAKEUPLOADING ARMUNIT 1
44 (1) VXL2798 TENSION ARMUNIT 1
45 (1) VXL2672 SUPPLYLOADING ARMUNIT 1
46 (1) VXL2785 PINCH ARMUNIT 1
47 (1) VXL2996 P5ARMUNIT 1
48 (1) VXL2792 IDLER ARMUNIT 1
49 (1) VXL2733 SUPPLYBRAKEARMUNIT 1
50 (1) VXL2747 LOADING RACK UNIT 1
51 (1) VXP2035 CENTRECLUTCH UNIT 1
60 (1) VMA9516 TOPPLATE 1
61 (1) VMB3047 CONNECTION SPRING 1
62 (1) VMD3379 SIDEPLATE(L) 1
63 (1) VXA6540 SIDEPLATE(R)UNIT 1
64 (1) VXA5746 CASSETTEHOLDER UNIT 1
65 (1) VXP1730 MAIN SHAFTUNIT 1
70 (1) VDP1668-K CLEANER ROLLER 1
71 (1) VML3164 CLEANER ARM 1
B1(1) VHD1117 SCREW 2
B2(1) VHD0842 SCREW 1
B3(1) VHD0843 SCREW 2
B4(1) VHD0844 SCREW 2
B6(1) VHD1066 SCREW 2
B7(1) VHD1044 SCREW 1
B8(1) VHD1060 SCREW 1
B9(1) VHD1071 SCREW 1
B11 (1) XTS26+6F SCREW 1
B12 (1) XTN26+6F SCREW 1
B13 (1) XTN26+7J SCREW 3
B14 (1) VHD1095 SCREW 1
B15 (1) VHD1185 SCREW 1
N1(1) VHN0311 PUSH NUT 1
W1(1) VMX2208 WASHER 1
W3(1) VMX3022 WASHER 2
11.2. CASING PARTS SECTIONPARTS LIST
20