Panasonic NV-SJ422EE User manual

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ORDER NO. VRD0104022C2
Video Cassette Recorder
NV-SJ422EE
Z-MECHANISM
SPECIFICATIONS
© 2001 Matsushita Electric Industrial Co., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of
law.

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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:
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. GENERAL DESCRIPTIONS
2.1. SERVICE CAUTION
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.

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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.Set the applicable Model and Option code by using
REW, PLAY, STOP and FF keys on the Remote
Controller. (See Fig.S1 & S2)
Exit from Service Mode.
7.Press the POWER Button to
turn the power off.
8. Press FF and EJECT keys
simultaneously in 6 times.
(Normal Indication)
Fig.S1 Service Secreen (sample)
Model No. Model
Code
Option
Code 1
Option
Code 2
Option
Code 3
NV-SJ422EE 38 / (26h) 8 / (08h) 244 /
(F4h)
6 / (06h)

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Fig. S2 Model Code & Option Code
NOTE:
Since all electrical adjustments data is still not available, perform the Electrical Adjustment continuously.
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 fiexible card from the FPC Holder.
D. Remove the CYLINDER UNIT.
CAUTION:
Handle the Cylinder fiexible 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

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

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Fig. S6
5. install the Cylinder Stator Unit.
6. Tighten 2 screws (A).
Fig. S7
7. 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

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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 simultaneosly 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.

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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.
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

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VFK0823FSE
(For end users)
Note:
The tape material itself is the same in both types.
2.4. SELF-DIAGNOSIS RESULT DISPLAY
The "SELF-DIAGNOSIS RESULT DISPLAY & MEMORY function is built in this VTR.
It means that when the VCR detects undesirable condition, it can be displayed a “Error code (Two numbers
from the left)” with Service Mode 2.
Since the "Error code" is stored in the EEPROM, it can be displayed although after disconnected the AC leads.
It can be displayed with Service Mode 2.
(If a second error had been detected, only the most recent error is displayed. )
For more details, refer to the Service Manual for Z-Mechanism Chassis Order number VRD9612M129.

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INDICATION CAUSE REMEDY/CHECK
01 After cylinder lock is detected, the cylinder does
not start rotating again even after tape unloading.
Check the cylinder motor drive circuit.
02 Cassette tape is not wound up during the tape
unloading except EJECT mode.
Check the capstan motor drive circuit.
03 Mechanism locks during mode transition except
EJECT mode.
1. Check the loading motor drive circuit.
2. Check the mechanism phase alignment.
3. Check the mode switch.
04 Mechanism locks during tape unloading. 1. Check the loading motor drive circuit.
2. Check the mechanism phase alignment.
06 Mechanism locks after tape unloading in EJECT
mode.
1. Check the loading motor drive circuit.
2. Check the mechanism phase alignment for cassette holder un
07 During recording mode, recording signal is less
than the normal condition.
Protection of the over-current flowing in transi
s
which produces the power supply for recordin
g
mode.
08 Recording circuit works except recording mode. Check the recording circuit.
16 Cylinder lock detection. Check the cylinder unit and the cylinder moto
r
drive circuit.
17 Supply reel mechanism lock detection Check the supply reel mechanism and the su
p
reel circuit.
18 Take-up reel mechanism lock detection Check the Take-up reel mechanism and the
Take-up reel circuit.
2* PG shifter automatic adjustment error. Check the servo/system control circuit and th
e
cylinder unit.
Fig. T1 Self-Test indication Display
3. ADJUSTMENT PROCEDURES
3.1. DISASSEMBLY METHOD
3.1.1. DISASSEMBLY FLOW CHART
This flow chart indicates disassembly steps of the cabinet parts and the circuit boards in order to find the
necessary items for servicing.
When reassembling, perform the steps in the reverse order.
Fig. D1

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3.1.2. DETAIL OF DISASSEMBLY METHOD
1. REMOVAL OF THE TOP PANEL
Remove 4 Screws (A)
Fig.D2
2. REMOVAL OF THE FRONT PANEL UNIT
Unlock 7 Tabs (B)
Fig. D3

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3. REMOVAL OF THE MECHANISM UNIT
Remove Screw (C)
Remove CYLINDER SHIELD
PLATE
Remove Screw (D)
Remove 3 Screws (E)
Remove 2 Screw (F)
Note:
1. Keep pressing 2 stoppers on Cassette Holder Plate and Press Cassette Holder Plate to the rear.
2. Remove the Mechanism Unit after bend the Cylinder Shield in the direction of the arrow.
Fig. D4

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4. REMOVAL OF THE MAIN C.B.A.
Remove 4 screws (G)
Unlock 4 Tabs (H)
Fig. D5
NOTE:
Before mounting the MAIN C.B.A. onto the frame, be sure to confirm that the insulation sheet is mounted on

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the frame as shown in Fig. D6.
Fig. D6
5. SERVICING POSITION
Fig. D7
3.2. MECHANICAL ADJUSTMENT PROCEDURES
Refer to the Service Manual for Z-Mechanism Chassis. / (Order No. VRD9802005C2)
3.3. ELECTRICAL ADJUSTMENT PROCEDURES
3.3.1. TEST EQUIPMENT
The following equipments are required for Electrical Adjustments.
1. Dual-Trace Oscilloscope
- Voltage Range: 0.005-5V/div
- Frequency Range: DC-35MHz
- Probes: 10:1 / 1:1
2. Frequency Counter
- Frequency Range: 0-10MHz
- Probes: 1:1
3. Universal Counter
4. Digital Volt Meter (D.V.M.)

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5. Video Sweep Generator
6. Sinewave Generator
7. Video Pattern Generator
8. Monitor TV
9. DC Power Supply
10. VHS Blank Tape
11. VHS Alignment Tape
- Parts No.: VFJ8125H3F(PAL)
3.3.2. VCR SETTING
When no indication in the procedure, set each selector as follows.
1. TAPE SPEED: SP
2. CHANNEL: AV1/AV2/AV3
(Set to signal input terminal number)
3.3.3. ADJUSTMENTS
Fig.E1 Fig.E2
CONDITION: BURST SIGNAL OFF /
75 ohm TERMINATED
3.3.4. PG SHIFTER ADJUSTMENT / (AUTOMATIC)

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PROCEDURES FIP DISPLAY
Press the FF and EJECT Keys
simultaneously for 3 seconds.
Press the FF and EJECT Keys
simultaneously twice.
Press the EJECT key for 3
seconds.
Press the CH UP key once.
Insert the Alignment cassette
tape. (PAL:VFJ8125H3F)
When the sequence of the automatical adjustment has
been terminated, the following action has been made.
*SUCCEED: The cassette tape is ejected.
*ERROR : The "F2"is displayed on the FIP.
(Check the Servo/Syscon circuit and Cylinder
unit.)
Release the Service mode by pressing the EJECT and
FF keys simultaneously in 6 times until the FIP
becomes normal indication.
Fig. E3
3.3.5. AI FUNCTION ADJUSTMENT (AUTOMATIC)
PROCEDURES FIP DISPLAY
Press the FF and EJECT Keys
simultaneously for 3 seconds.
Press the FF and EJECT Keys
simultaneously twice.
Press the EJECT key for 3
seconds.
Press the CH UP key in 3 times.
Insert the blank cassette tape.
(The adjustment is automatically
started.)
When the sequence of the automatical adjustment has
been terminated successfully, the VCR goes to STOP
mode.

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PROCEDURES FIP DISPLAY
Release the Service mode by pressing the EJECT and
FF keys simultaneously in 6 times until the FIP
becomes normal indication.
Fig. E4
3.3.6. VIDEO FREQUENCY RESPONSE ADJUSTMENT
PROCEDURES FIP DISPLAY
Input the Video sweep signal.
(See Fig.E1)
Press the FF and EJECT Keys
simultaneously for 3 seconds.
Press the FF and EJECT Keys
simultaneously twice.
Press the EJECT key for 3
seconds.
Press the CH UP and/or CH
DOWN key until "11" is displayed
on FIP.
Insert the Self-recorded tape and
playback it. (SP/LP/EP mode)
Connect the Oscilloscope to:
*CH1....Video Out (TW3002).
*CH2....V.FREQ.(TW6002)
Press the "4" key on the remote controller.
(Confirm that TW6002 becomes high(5V)).
Adjust the Frequency response by pressing the
"2"(increase) and/or "8"(decrease) key on the Remote
Controller. (See Fig.E2)
Store the Adjusted value by pressing the "5" key on
the Remote Controller.
Release the Service mode by pressing the EJECT and
FF keys simultaneously in 6 times until the FIP
becomes normal indication.
Fig. E5
3.3.7. LOCATION OF TEST POINTS& CONTROLS

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3.3.8. CIRCUIT BOARD LAYOUT

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443NT [L]
A. COMP
A. COMPO
A. D.P [L]
A. D/L [L]
A. DEF [S]
A. DEF [S] [L]
A. DUB P [L]
A. DUB [H]
A. ERASE
A. H. SW
A. HEAD [R]
A. HEAD [W]
A. IN [L]
A. IN [R]
A. MUT [H]
A. MUTE [H]
A. OUT [L]
A. OUT [R]
A. RF OUT
A/VS/S. DATA
AC ONLINE
AC. O/EE. H
AFC S C
AFC [S]
AFC. DEF
ARFC OUT
ART. V
ART. V. MM
ART. V/H/N
AT. V/H/N
ATSW/TEST/NOR/SE
AUDIO IN [L]
AUDIO IN [R]
AUDIO OUT [L]
AUDIO OUT [R]
AUDIO SELECT [H]
AUDIO. L
AUDIO. R
AV CNT
AV CTL
AV CTL/S. CLK
AV. C.M.
AVCNT/METER. R
AVSW/METER. L
B MODE. H
B.G.P
BACKUP 5V
BAND. U.E.
BANDVL. D
BI/MI [L]
4.43 NTSC L
AUDIO COMPONENT SIGNAL
AUDIO COMPONENT SIGNAL
AUDIO DUBBING PAUSE L
AUDIO DUBBING PAUSE L
AUDIO DEFEAT
AUDIO DEFEAT
AUDIO DUBBING PAUSE L
AUDIO DUBBING H
AUDIO ERASE
AUDIO HEAD SWITCHING PULSE
AUDIO HEAD (REC)
AUDIO HEAD (PLAY)
AUDIO INPUT (L)
AUDIO INPUT (R)
AUDIO MUTE H
AUDIO MUTE H
AUDIO OUTPUT (L)
AUDIO OUTPUT (R)
AUDIO RF SIGNAL OUTPUT
AV SW/SERIAL DATA
AC ONLINE
AC ONLINE/EE H
AFC S CURVE
AFC S CURVE
AFC DEFEAT
AUDIO RF SIGNAL OUTPUT
ARTIFICIAL VERTICAL SYNC SIGNAL
ARTIFICIAL VERTICAL SYNC
SIGNAL MONO MULTI
ARTIFICIAL VERTICAL SYNC
SIGNAL H/NORMAL
ARTIFICIAL VERTICAL SYNC SIGNAL
TEST/NORMAL/SERVICE
AUDIO INPUT (L)
AUDIO INPUT (R)
AUDIO OUTPUT (L)
AUDIO OUTPUT (R)
AUDIO SELECT H
AUDIO (L)
AUDIO (R)
AV CONTROL
AV CONTROL
AV CONTROL/SERIAL CLOCK
AV CONTROL MODE
AV CONTROL/LEVEL METER (R)
AV SW/LEVEL METER (L)
B MODE H
BURST GATE PULSE
BACK UP 5V
BAND U
BAND VL
BILINGUAL/MIX L
BIL
BIL [L]
BIL. [H]
BIL/M1 [L]
BS CLOCK
BS DATA
BS LCH IN
BS MIX [H]
BS MON [H]
BS MONI [H]
BS RCH IN
BS VIDEO
BS VIDEO/BS1
BS [H]
BS. LEVEL
BS. M [H]
BS/VTR [H]
BUS CLK
BUS LSN
BUS TLK
BUZZER
CAP EC
CAP M GND
CAP. ET
CAP. FG1
CAP. FG2
CAS. SW
CCN
CCP
CHM
CHP
CINEM [L]
CINEMA [L]
CINEMA/MIX
CKL
CKS
CL
CLK
CLK (C.G)
CLOCK. IN
CLP
COL/B/W/NOR
COLOR [H]
CONV
CS
CTL GND
CTL HEAD [
+
]
CTL HEAD [
−
]
CTL [
+
]
CTL [
−
]
CUE BIAS
CURRENT LIM
CYL ET
BILINGUAL
BILINGUAL L
BILINGUAL H
BILINGUAL L
BS CLOCK
BS DATA
BS L CHANNEL INPUT
BS MIX H
BS MONITOR H
BS MONITOR H
BS R CHANNEL INPUT
BS VIDEO SIGNAL
BS VIDEO SIGNAL
BS H
BS LEVEL
BS MONITOR H
BS/VTR H
BUS CLOCK
BUS LISTEN
BUS TALK
BUZZER
CAPSTAN TORQUE CONTROL
CAPSTAN MOTOR GND
CAPSTAN TORQUE CONTROL
CAPSTAN FG1 PULSE
CAPSTAN FG2 PULSE
CASSETTE SW
PLAYBACK CONTROL SIGNAL (−)
PLAYBACK CONTROL SIGNAL (+)
CONTROL SIGNAL (
+
)
CONTROL SIGNAL (
−
)
CINEMA L
CINEMA L
CINEMA/MIX
RATCH LOCK
SHIFT LOCK
CLOCK
CLOCK
CLOCK
CLOCK INPUT
CLAMP
COLOUR/BLACK & WHITE/NORMAL
COLOUR H
CONVERTOR
CHIP SELECT
CONTROL GND
CONTROL HEAD (
+
)
CONTROL HEAD (
−
)
CONTROL HEAD (
+
)
CONTROL HEAD (
−
)
CUE BIAS
CURRENT LIMMITER
CYLINDER TORQUE CONTROL

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CYL GND
D.F.M. REC [H]
D. FM REC [L]
D. GND
D. REC [H]
D4/S. LED
D4/STILLED
DAC [CLK]
DAC/FSCS
DAREC [H]
DATA
DECODER [L]
DECODER [R]
DEW
DEW SNS
DFMRE [H]
E. REC 5V
EC
ECR
EDT TRIG [L]
EDIT [H]
EE [H]
EE [H]/INS [M]
EE. VV. TR
EJECT. PO
EJECT/VDET
ENV. SEL
ENVE. OUT
ENVE. SEL
ENV SELECT
EP [H]
EP/LP [H]
EP/LP/SP
EP/SS [H]
EPROMCS
EX. REC 5V
FF/REW [L]
FG1 IN
FG2 IN
FILTER ADJUSTMENT
FLY ERASE [H]
FLY ON [H]
FLY. E [H]
FM MUT [H]
FM MUTE [H]
FM OUT [L]
FM OUT [R]
FM PACK OUT [L]
FM PACK OUT [R]
FM/BS SEL [L]
FM/BS SEL [R]
FS. CLK
FUL. E [H]
FULL. E [H]
CYLINDER GND
DELAIED FM RECORDING H
DELAIED FM RECORDING L
DIGITAL GND
DELAYED RECORDING H
D4/STILL LED
D4/STILL LED
TUNER DAC (CLOCK)
TUNER DAC/FS CHIP SELECT
DELAYED AUDIO RECORDING H
DATA
DECODER (L)
DECODER (R)
DEW
DEW SENSOR
DELAYED FM AUDIO RECORDING H
EXCEPT RECORDING 5V
ERROR TORQUE CONTROL
ERROR TORQUE CONTROL
REFERENCE VOLTAGE
EDIT TRIGGER L
EDIT H
EE H
EE H/INSERT M
EE/VV/TRICK PLAY
EJECT POSITION
EJECT/REVERSE SLOW LOCK
ENVELOPE SELECT
ENVELOPE OUTPUT
ENVELOPE SELECT
ENVELOPE SELECT
LP H
LP H
LP/SP
LP/SLOW/STILL/STOP H
EPROM CHIP SELECT
EXCEPT RECORDING 5V
FIRST FORWARD/REWIND L
FG1 PULSE INPUT
FG2 PULSE INPUT
FILTER ADJUSTMENT
FLYING ERASE HEAD ON H
FLYING ERASE HEAD ON H
FLYING ERASE HEAD ON H
FM AUDIO MUTE H
FM AUDIO MUTE H
FM OUTPUT (L)
FM OUTPUT (R)
FM PACK OUTPUT (L)
FM PACK OUTPUT (R)
FM/BS SELECT (L)
FM/BS SELECT (R)
FS CLOCK
FULL ERASE HEAD ON H
FULL ERASE HEAD ON H
FULL. E. 12V
GND [A]
GND [TU]
GND/N. SW. 12V
H. SYNC
H. AMP. SW
H. P <R>
H. P <L>
H. P GND
H. P OUT [L]
H. P OUT [R]
H. SW
HEAD PHONE [L]
HEAD PHONE [R]
HEAD SW
HEATER [
+
]
HEATER [
−
]
HSS
HTR [
+
]
HTR [
−
]
I RFE
ICL
IF
IN SELA1
IN SELA2
IN SELA3
INS L/R [L]
INS. [H]
INSEL A1
INSEL A2
INSERT
INSERT [H]
IO CS
JOG1
JOG S3 LED/FOWRD
JOG/F. LED
JSB [H]
JST. CLCK
JST. CLK
JST. CLOCK
L. OUT
L. CH [H]
L. CH [L]
LED (MAIN)
LED (STEREO)
LED (SUB)
LED CKL
LED CKS
LED DATA
LINE IN 1 [L]
LINE IN 1 [R]
LINE IN 2 [L]
LINE IN 2 [R]
LINE IN V
LINE IN [L]
FULL ERASE 12V
GND (ANALOG)
GND (TUNER)
GND/NON SW 12V
HORIZONTAL SYNC
HEAD AMP SW PULSE
HEAD PHONE (R)
HEAD PHONE (L)
HEAD PHONE GND
HEAD PHONE OUTPUT (L)
HEAD PHONE OUTPUT (R)
HEAD SW PULSE
HEAD PHONE (L)
HEAD PHONE (R)
HEAD SW
HEATER (
+
)
HEATER (
−
)
HORIZONTAL SYNC SIGNAL
HEATER (
+
)
HEATER (
−
)
REFERENCE CURRENT
CONTROL AGC CIRCUIT
INTERMEDIATE FREQUENCY
INPUT SELECT A1 POSITION
INPUT SELECT A2 POSITION
INPUT SELECT A3 POSITION
INSERT Lch/Rch L
INSERT H
INPUT SELECT A1 POSITION
INPUT SELECT A2 POSITION
INSERT
INSERT H
INPUT/OUTPUT CHIP SELECT
JOG1
JOG LED/FORWARD LED
JOG LED/FORWARD LED
JSB H
JUST CLOCK
JUST CLOCK
JUST CLOCK
Lch OUTPUT
Lch H
Lch L
LED (MAIN)
LED (STEREO)
LED (SUB)
LED SERIAL CLOCK
LED SERIAL CLOCK
LED SERIAL DATA
LINE INPUT 1 (L)
LINE INPUT 1 (R)
LINE INPUT 2 (L)
LINE INPUT 2 (R)
LINE INPUT VIDEO
LINE INPUT (L)