Panasonic NV-FJ623EG User manual

Service Manual
ORDER NO. VRD0202004C2
Video Cassette Recorder
lNV-FJ623EG/NV-FJ623EGY/NV-FJ628EE
Z-MECHANISM
© 2002 Matsushita Electric Industrial Co., Ltd. All rights reserved. Unauthorized copying and distribution is a
violation of law.

1. INTRODUCTION
This service manual contains technical information which will allow service
personnel to understand and service this model.
If the circuit is changed or modified, this information will be followed by
supplementary service manual to be filed with original service manual.
Note:
1. Adjustment procedures, Disassembly Procedures and Assembly
Procedures for Mechanism Chassis are separate volume from this service
manual./Please refer to the service manual for Z-Mechanism Chassis.
(Order No. VRD9802005C2)
2.
The Model No. is indicated on the Schematic Diagram and Circuit Board
Diagrams as follows.
Model No. Indication Mark
NV-FJ623EG (EG)
NV-FJ623EGY
(EGY)
NV-FJ628EE (EE)

2.1.1 REPLACING IC7702/EEPROM
When the EEPROM: IC7702 is replaced, applicable model code, option code and electrical adjustment data will
not be available.
Therefore, enter and/or adjust the necessary data after replacing IC7702 by referring following procedure.
STEP1.REPLACE THE IC7702
1. Remove the C.B.A. with Mechanism unit by referring the Disassembly procedure.
2. Disconnect the AC plug and replace the IC7702.
STEP2.INPUT THE MODEL & OPTION CODE
1. Set up the applicable model code and option code by ordering the following table.
Fig.S1 Service Secreen (sample)
PROCEDURE F.I.P. DISPLAY
Turn on the Service Mode
1.Press the FF key and the EJECT key simultaneously for more than 3 seconds.
Activate the Service Mode 2
2.While keep placing FF key, press the EJECT key in twice.
Activate the Entering Mode.
3.Press the EJECT key for more than 3 seconds.
Set the Mode 2.
4.Press the CH UP key in twice.
Display the Setting Code.
5.Press the POWER Button to turn the power on.
(Colon starts flashing)
Enter the Model and Option Code.
6.Service Screen is displayed on the monitor.
7.Set the applicable Model and Option code by using REW, PLAY, STOP and FF keys on theRemote Controller. (See Fig.S1 & S2)
Exit from Service Mode.
8.Press the POWER Button to turn the power off.
9. Press FF and EJECT keys simultaneously in 6 times.
(Normal Indication)

NOTE:
Since all electrical adjustments data is still not available, perform the Electrical Adjustment continuously.
Model No. Model
Code
Option Code 1
Option Code 2
Option Code 3
NV-FJ623EG/EGY
65
(41h)
125
(7Dh) 196 (C4h) 6 (6h)
NV-FJ628EE 70
(46h)
121
(79h) 196 (C4h) 6 (6h)
Fig. S2 Model Code & Option Code

2.1.2 CYLINDER UNIT REPLACEMENT
1. CYLINDER UNIT REPLACEMENT
A. Remove the mechanism unit from MAIN C.B.A./Chassis by referring “SECTION 2. Disassembly
Procedure”.
B. Remove the 3 screws (A) of the CYLINDER UNIT with a screw driver.
C. Unlock the 4 locking tabs (B) and disconnect the Cylinder flexible card from the FPC Holder.
D. Remove the CYLINDER UNIT.
CAUTION:
Handle the Cylinder flexible card with care. When it damaged, you should replace whole Cylinder
unit.
Fig. S3
2. UPPER CYLINDER DISASSEMBLY
A. Remove 2 screws (A).
B. Remove the Cylinder Stator Unit.
C. Remove 2 screws (B).
D. Remove the Cylinder Rotor Unit.
E. Loose Hex screw (C) (1.5 mm) and remove the CYLINDER RETAINER.
F. Remove the Upper Cylinder.
Fig. S4

3. UPPER CYLINDER ASSEMBLY
When reassembling, perform the steps in the reverse order.
Notes:
A. Install the Cylinder Retainer so that the 2 holes on top of the Cylinder Retainer are at right angles
with the P3502 Connection.
B. Tighten the Hex screw (C) (1.5 mm) while pressing down on top of the Cylinder Retainer.
Fig. S5

C. Install the Cylinder Rotor Unit so that the inner hole of the Cylinder Rotor Unit fits to the small
projection (D) on top of the Upper Cylinder.
D. Tighten 2 screws (B).
Fig. S6
E. install the Cylinder Stator Unit.
F. Tighten 2 screws (A).
Fig. S7
G. Confirm the PG SHIFTER ADJUSTMENT with the alignment tape (PAL: VFJ8125H3F) and adjust
it if necessary.

2.1.3 CHECKING OF MAIN C.B.A.
When servicing the MAIN C.B.A., take out the MAIN C.B.A. and mechanism from the frame and turn over.
Fig. S8
2.1.4 FLAT CARD CABLE INSTALLATION
When installing the Flat Card Cable on the connector, install the Flat Card Cable with the cable contacts facing
the connector contacts.
Fig. S9

2.2 REMOVAL OF CASSETTE TAPE
There are 2 ways to remove a cassette tape.
1. Service Information Display Operation
A. Press the FF and EJECT keys simultaneously for 3 seconds and set the Service Mode 7.
B. Press STOP key in order to rotate the Loading Motor for unloading operation. (Pay an attention of
tape slack)
2. Manual Operation
A. Disconnect the AC Mains Lead and remove the Top Panel.
B. Rotate the Main Cam Gear clockwise until the Loading Posts move to fully unloaded position as
shown in Fig. S10 . (Tape is remaining)
Fig. S10
C. Rotate the Capstan Motor clockwise from the bottom side to take up the tape.
Fig. S11
D. Rotate the Main Cam Gear clockwise until the cassette tape is ejected.

2.3 INTRODUCTION OF VIDEO HEAD CLEANING CASSETTE/
(POLISHING TYPE)
1. We are pleased to introduce Panasonic Video Head Cleaning Cassette, VFK0923FT [for service purposes]
and VFK0923FSE [ for end users] for all VHS/SVHS VCP and VCR.
2. These cleaning cassettes are exclusive removing the hard and sticky clogging on video heads.
3. These improve the efficiency of video head cleaning service and shortening cleaning time for end users.
Note:
The tape material itself is the same in both types.
VFK0923FT
(For Service usage)
Type of Cassette Full VHS Cassette
Cleaning Time 10 Seconds/Time
Tape Length 20 m
Usability in a Path
180 Times
VFK0823FSE
(For end users)
Type of Cassette Full VHS Cassette
Cleaning Time 10 Seconds/Time
Tape Length 3.34 m
Usability in a Path
30 Times