JVC KV-V8E, KV-V8J Service Manual

SERVICE MANUAL

MOBILE VIDEO CASSETTE PLAYER

KV-V8

KV-V8

Contents

q Specifications
q CAUTION
q Instructions

1. DISASSEMBLY

1.1 Disassembly flow chart 1-1

1.2 How to read the disassembly and assembly 1-1

1.3 Disassembly/assembly method 1-1

1.4 Service position 1-4

1.5 Mechanism service mode 1-4

1.6 Emergency display function 1-5

2. MECHANISM ADJUSTMENT

2.1 Before starting repair and adjustment 2-1

2.2 Replacement of major parts 2-4

2.3

Installation of major parts (Mechanism phase alignment)

2.4 Mechanism timing chart 2-11

2.5 Compatibility adjustment 2-12

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COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.

Comparison table

Item KV-V8E KV-V8J

Signal system PAL NTSC

Area Continental Europe U.S.A.

3. ELECTRICAL ADJUSTMENT

3.1 Precaution 3-1

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3.2 Servo circuit 3-1

5. PARTS LIST

5.1 PACKING AND ACCESSORY ASSEMBLY <M1> 5-1

5.2 FINAL ASSEMBLY <M2> 5-2

5.3 MECHANISM ASSEMBLY <M4> 5-4

5.4 ELECTRICAL PARTS LIST 5-6

2-9

Area Suffix

EJContinental Europe

North America

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No.49625

Feb. 2001

Specificatios (KV-V8J)

General

•Power supply : DC12 V (11V-16V allowable)Negative ground

•Dimensions : 259 mm x 94 mm x 270 mm (10-1/4"x 3-3/4"x 10-11/16")
(width x height x depth)

•Mass : 3.2 kg (7.1 lbs)

•Allowable working temperature : 0 °C to +40 °C (32 °F to104 °F)

•Allowable relative humidity : 35%to 80%

•Allowable conservation temperature : -20 °C to +60 °C (-4 °F to 140 °F)

Video

•Playback system : VHS format,Hi-Fi 4-heads helical scan

•Video signal : VHS NTSC standard

Audio

•Playback system : VHS stereo Hi-Fi audio

•Audio track : 2 Hi-Fi audio channels and 1 normal audio channel

•Remote control unit : A code
(A code and B code are switchable automatically in the main unit.)

Design and specifications subject to change without notice.

Specificatios (KV-V8E)

General

•Power supply : DC12 V (11V-16V allowable)Negative ground

•Dimensions : 259 mm x 94 mm x 270 mm
(width x height x depth)

•Mass : 3.2 kg

•Allowable working temperature : 0 °C to +40 °C

•Allowable relative humidity : 35%to 80%

•Allowable conservation temperature : -20 °C to +60 °C

Video

•Playback system : VHS format,Hi-Fi 4-heads helical scan

•Video signal : VHS PAL standard

Audio

•Playback system : VHS stereo Hi-Fi audio

•Audio track : 2 Hi-Fi audio channels and 1 normal audio channel

•Remote control unit : A code
(A code and B code are switchable automatically in the main unit.)

Design and specifications subject to change without notice.

CAUTION

!

Burrs formed during molding may be left over on some parts of the chassis. Therefore,
pay attention to such burrs in the case of preforming repair of this system.

SECTION 1

DISASSEMBLY

1.1 Disassembly flow chart

This flowchart lists the disassembling steps for the cabinet
parts and P.C. boards in order to gain access to item(s)
to be serviced. When reassembling, perform the step(s) in
reverse order. Bend, route and dress the flat cables as they
were originally laid.

[1]

[2]

SW board assembly, Front panel assembly

[3]

Cassette housing assembly

[4]

[5]

[6]

Top cover

Drum assembly

Mechanism assembly

Main board assembly

1.2 How to read the disassembly and assembly

<Example>

Step/

Loc No.

[1] Top cover D1

Part Name

Bracket 2(S1c)

Fig.
No.

Point Note

4(S1a),(S1b),3(L1a),
2(SD1a), (P1a),
CN1(WR1a),

<Note 1>

1.3 Disassembly/assembly method

Step/

Loc No.

[1] Top cover D1
[2] SW board assembly, D2

[3] Cassette housing D3a, 2(S3a), 2(L3a) <Note 3a>

[4] Drum assembly D4 CN1(WR4a), <Note 2a>

[5] Mechanism assembly D5 CN1(WR5a), <Note 2a>

[6] Main board assembly D6 (S6a), (S6b)

<Note 2a>

• Be careful not to damage the connector and wire etc. during connec­tion and disconnection. When connecting the wire to the connector, be
careful with the wire direction.

<Note 2b>

• When reattaching the Front panel assembly, make sure that the door
opener “a” of the Cassette housing assembly is lowered in position
prior to the reinstallation.

<Note 3a>

• When installing the Cassette housing assembly, make sure that the
Control cam and the Main deck alignment holes are aligned. if they
are not, rotate the Loading motor belt to the front align the holes.

• When installing the Cassette housing assembly, be careful not to dam­age the parts of the Main board and Mechanism assemblies.

Part Name

Front panel assembly 4(L2a), 3(L2b), <Note 2b>

assembly D3b

Fig.
No.

Point Note

2(S1a), (S1b), 2(S1c)
2(S2a), (WR2a), stay

-------------------

CN3006(WR2b)

CN1(WR4b),
(S4a), (S4b), (S4c)

CN3003(WR5b), <Note 5a>
CN3005(WR5c),
2(S5a), (S5b),
2(L5a)

<Note 2a>

(1) (2) (3) (4) (5)

(1) Order of steps in Procedure

When reassembling, perform the step(s) in the reverse order.
These numbers are also used as the identification (location) No.

of parts Figures.
(2) Part name to be removed or installed.
(3) Fig. No. showing procedure or part location.
(4) Identification of part to be removed, unhooked, unlocked,

released, unplugged, unclamped or unsoldered.

P= Spring, W= Washer, S= Screw, L= Locking tab, SD= Solder,

CN**(WR**)= Remove the wire (WR**) from the connector

(CN**).

Note:

• The bracketed ( ) WR of the connector symbol are as-

signed nos. in priority order and do not correspond to
those on the spare parts list.

(5) Adjustment information for installation

<Note 5a>

• When removing the Mechanism assembly only, unhook the two spacers
connecting it with the Main board assembly with pliers from the back
side of the Main board assembly first, and then remove the Mecha­nism assembly.

• When reattaching the Mechanism assembly to the Main board as­sembly, take care not to damage the sensors on the Main board as­sembly.

1-1

(S1a)

[1] Top cover

(S3a)

(S1c)

(S3a)

(S1b)

(L3a)

(S1c)

[3] Cassette

housing
assembly

A

Switch lever

(L3a)

(S1a)

(L2a)

[2] Front panel

assembly

WR2a

WR2b
Foil side
<Note 2a>

(L2b)

G

CN3006

Fig. D1

(L2a)

A

(S2a)

[2] SW board

assembly

SW board

Stay

Detail “G”

(S2a)

Door opener
“a” <Note 2b>

WR2a

WR2b

REC safety switch
<Note 3a>

Rear side

Fig. D3a

Control cam

Pinch plate

Loading motor belt

Hole align
with hole in
deck
<Note 3a>

Chassis

Main board

CN3006

Fig. D2 Fig. D3b

1-2

Front
board

Note:

When installing the Drum assembly, secure the screws (S4a – S4c)
in the order of a , b , c .

(S6b)

(S6a)

Not used
Inertia plate

[4]
Drum
assembly

(S4c)

(S4a)

(L5b)

CN1

WR4a
Supporting
tape side
<Note 2a>

CN1

Fig. D4

WR4b
Supporting
tape side
<Note 2a>

(S4b)

< e >

Not used

Not used
Cleaner assembly
<Note 5>

< d >

(L5a)

[6] Main board

assembly

Fig. D6

Not used

[5] Mechanism

assembly

(L5a)
Spacer
<Note5a>

WR4

(S5a)

(S5b)

CN1

CN3005

WR5a

WR5c

WR5b
Red line:
CN3003 pin1

CN3003

Fig. D5

1-3

1.4 Service position

This unit has been designed so that the Mechanism and Main
board assemblies can be removed together from the chas­sis assembly. Before diagnosing or servicing the circuit
boards, take out the major parts from the chassis assembly.

1.4.1 How to set the "Service position”

(1) Refer to the disassembly procedure and perform disas-

sembly of the major parts before removing the Cassette
housing assembly.

(2) Remove the combined Cassette housing, Mechanism

and Main board assemblies.

(3) Connect the wires and connectors of the major parts that

have been removed in step (1). (Refer to Fig. 1-4-1a.)

(4) Place the combined Mechanism and Main board assem-

blies upside down.

(5) Insert the power cord plug into the power outlet and then

proceed with the diagnostics and servicing of the board
assembly.

Notes:

• Before inserting the power cord plug into the power
outlet, make sure that none of the electrical parts are
able to short-circuit between the workbench and the
board assembly

• For the disassembly procadure of the major parts and
details of the precautions to be taken, see “1.3 Disas­sembly/assembly method”.

• If there are wire connections from the Main board and
Mechanism assemblies to the other major parts, be
sure to remove them first before performing step (2).

• When carrying out diagnosis and repair of the Main
board assembly in the “Service position”, be sure to
ground both the Main board and Mechanism assem­blies. If they are improperly grounded, there may be
noise on the playback picture or FDP counter display
may move even when the mechanism is kept in an in­operative status.

• In order diagnose the playback or recording of the cas­sette tape, set the Mechanism assembly to the required
mode before placing it upside down. If the mechanism
mode is changed (including ejection) while it is in an
upside down position the tape inside may be damaged.

• When checking the operation or performing adjust­ments to the VCP main unit, it is necessary to connect
the power cable (Car Cable) to the VCP main unit so
that DC power is supplied. Also, when using the re­mote control unit, it is required to connect the IR re­ceiver. (by using either the provided or optional acces­sories)

Main board assembly

SW board

assembly

Front board
assembly

CN7001

MECHA TEST

TP111
D.FF

CN3006

TP7001

TP4001
CTL.P

TP7002

TP2253
A FM

CP5001 CP5002

GND

TP106
PB FM

Fig. 1-4-1a

1.5 Mechanism service mode

This model has a unique function to enter the mechanism
into every operation mode without loading of any cassette
tape. This function is called the "Mechanism service mode".

1.5.1 How to set the "Mechanism service mode"

(1) Unplug the power cord plug from the power outlet.
(2) Remove the Front panel assembly and Cassette hous-

ing assembly. (Take care not to pull the flat wire.)

(3) Connect TPGND and TP7001(TEST) on the Front board

assembly with a jump wire.
(4) Insert the power cord plug into the power outlet.
(5) Turn on the power. When the loading has completed,

the mechanism enters the desired mode.

1-4

1.6 Emergency display function

This unit has a function for storing the history of the past two
emergencies (EMG) and displaying them on each FDP (or OSD).
With the status of the VCR and mechanism at the moment an
emergency occurred can also be confirmed.

FDP display model
[FDP display]

0 : 00 : 00

E:** :**

*1 : *2 : 34

*5: *6 : *7

Normal display

EMG content display
(E:Latest:Previous)

EMG detail information <1>

EMG detail information <2>

1.6.1 Displaying the EMG information

(1) Transmit the code “59” from the Jig RCU.

The FDP shows the EMG content in the form of “E:**:**”.

Example 1 E : 01 : 03

Previous EMG

Latest EMG

Example 2 E : –– : ––

No EMG record

Notes:

•

For the OSD display model, all EMG information are
showed by transmitting first code from the Jig RCU.

•

For the EMG content, see “1.6.3 EMG content descrip­tion”.

OSD display model
[OSD display]

EMG
E: **:**
*1 : *2 : 34

*5: *6 : *7

EMG content display
(E:Latest:Previous)

EMG detail information <1>

EMG detail information <2>

Notes:

•

The EMG detail information <1><2> show the information
on the latest EMG.
It becomes “ – – : – – : – –” when there is no latest EMG
record.

•

When using the Jig RCU, set its custom code to match
the custom code of the VCR.

Jig RCU

[Data transmitting method]
Depress the “ ” ( 3 ) button
after the data code is set.

CUSTOM CODE
43: A CODE
53: B CODE

DATA CODE

INITIAL MODE

Fig. 1-6a Jig RCU [PTU94023B]

(2) Transmit the code “59” from the Jig RCU again.

The FDP shows the EMG detail information <1> in the form
of “ * 1 : *2 : 34 ”.

* 1 : Deck operation mode at the moment of EMG
* 2 : Mechanism operation mode at the moment of EMG
3– : Mechanism sensor information at the moment of

EMG

–4 : Mechanism mode position at the moment of EMG

Note:

•

For the EMG detail information <1> , see “1.6.4 EMG de­tail information <1> ”.

(3) Transmit the code “59” from the Jig RCU once again.

The FDP shows the EMG detail information <2> in the form
of “ * 5 : *6 : * 7 ”.

* 5 : Type of the cassette tape in use <1> .
* 6 : Winding position of the cassette tape in use
* 7 : Type of the cassette tape in use <2> (Winding area)

Note:

•

For the EMG detail information <2> , see “1.6.5 EMG de­tail information <2>”.

(4) Transmit the code “59” from the Jig RCU once again to re-

set the display.

1.6.2 Clearing the EMG history

(1) Display the EMG history.
(2) Transmit the code “36” from the Jig RCU.
(3) Reset the EMG display.

1-5

1.6.3 EMG content description

Note:

EMG contents “E08/E09” are for the model with Dynamic Drum (DD).

FDP CONTENT CAUSE

E01: Loading EMG

E02:

Unloading EMG

E03: Take Up Reel

Pulse EMG

E04: Drum FG

EMG

E05: Cassette Eject

EMG

E06: Capstan FG

EMG

E07: SW Power

Short-Circuit
EMG

E08:

DD Initialized
(Absolute
Position
Sensor)
EMG

E09: DD FG EMG

E0A:Supply Reel

Pulse EMG

EC1 or EU1:
Head clog warning

When the mechanism mode cannot be changed to an­other mode even when the loading motor has rotated
for more than 4 seconds in the loading direction, [E:01]
is identified and the power is turned off.

When the mechanism mode cannot be changed to an­other mode even when the loading motor has rotated
for more than 4 seconds in the unloading direction, [E:02]
is identified and the power is turned off.

When the take-up reel pulse has not been generated for
more than 4 seconds in the capstan rotating mode, [E:03]
is identified, the pinch rollers are turned off and stopped,
and the power is turned off. However, the reel EMG is
not detected in STILL/SLOW modes.

When the drum FG pulse has not been input for more
than 3 seconds in the drum rotating mode, [E:04] is iden­tified, the pinch rollers are turned off and stopped, and
the power is turned off.

When the eject operation does not complete in 3 sec­onds after the start, [E:05] is identified, the pinch rollers
are turned off and stopped, and the power is turned off.
When the cassette insertion operation does not complete
in 3 seconds after the start, the cassette is ejected. In
addition, when the operation does not complete within
3 seconds after the start, [E:05] is also identified and the
power is turned off immediately.

When the capstan FG pulse has not been generated for
more than 1 second in the capstan rotating mode, [E:06]
is identified, the pinch rollers are turned off and stopped,
and the power is turned off.However, the capstan EMG
is not detected in STILL/SLOW/FF/REW modes.

When short-circuiting of the SW power supply with GND
has lasted for 0.5 second or more, [E:07] is identified,
all the motors are stopped and the power is turned off.

When DD tilting does not complete in 4 seconds, [E:08]
is identified, the tilt motor is stopped and the power is
turned off.

When the DD FG pulse is not generated within 2.5 sec­onds, [E:09] is identified, the tilt motor is stopped and
the power is turned off.

When the supply reel pulse has not been generated for
more than 10 seconds in the capstan rotating mode,
[E:0A] is identified and the cassette is ejected (but the
power is not turned off). However, note that the reel EMG
is not detected in the SLOW/STILL mode.

Presupposing the presence of the control pulse output in the PLAY mode, when the value obtained by mixing the two V.FM output
channels (without regard to the A.FM output) has remained below a certain threshold level for more than 10 seconds, [E:C1] or [E:U1]
is identified and recorded in the emergency history. During the period in which a head clog is detected, the FDP and OSD repeat the
“3-second warning display” and “7-second noise picture display” alternately.

EMG code : “E:C1” or “E:U1” / FDP : “U:01” / OSD : “Try cleaning tape.” or “Use cleaning cassette.”
The head clog warning is reset when the above-mentioned threshold has been exceeded for more than 2 seconds or the mode is
changed to another mode than PLAY.

1.

The mechanism is locked in the middle of mode transition.

2

. The mechanism is locked at the loading end due to the encoder position

reading error during mode transition.

3.

Power is not supplied to the loading MDA.

1.

The mechanism is locked in the middle of mode transition.

2.

The mechanism is locked at the unloading end due to the encoder posi­tion reading error during mode transition.

3.

Power is not supplied to the loading MDA.

1.

The take-up reel pulse is not generated in the FWD transport modes (PLAY/
FWD SEARCH/FF, etc.) because;

1) The idler gear is not meshed with the take-up reel gear;

2)

The idler gear is meshed with the take-up reel gear, but incapable of wind-

ing due to too large mechanical load (abnormal tension);

3) The take-up reel sensor does not output the FG pulse.

2.

The supply reel pulse is not generated in the REV transport modes (REV
SEARCH/REW, etc.) because;

1) The idler gear is not meshed with the supply reel gear.

2) The idler gear is meshed with the supply reel gear, but incapable of wind­ing due to too large a mechanical load (abnormal tension);

3) The supply reel sensor does not output the FG pulse.

3.

Power is not supplied to the reel sensors.

1.

The drum could not start or the drum rotation has stopped due to too large
a load on the tape, because;

1) The tape tension is abnormally high;

2)

The tape is damaged or a foreign object (grease, etc.) adheres to the tape.

2.

The drum FG pulse did not reach the System controller CPU because;

1) The signal circuit is disconnected in the middle;

2) The FG pulse generator (hall device) of the drum is faulty.

3.

The drum control voltage (DRUM CTL V) is not supplied to the MDA.

4.

Power is not supplied to the drum MDA.

1.

The cassette cannot be ejected due to a failure in the drive mechanism of
the housing.

2.

When the housing load increases during ejection, the loading motor is
stopped because of lack of headroom in its drive torque.

Housing load increasing factors: Temperature environment (low tempera­ture, etc.), mechanism wear or failure.

3.

The sensor/switch for detecting the end of ejection are not functioning normally.

4.

The loading motor drive voltage is lower than specified or power is not sup­plied to the motor (MDA).

5.

When the user attempted to eject a cassette, a foreign object (or perhaps
the user's hand) was caught in the opening of the housing.

1.

The capstan could not start or the capstan rotation has stopped due to too
large a load on the tape, because;

1) The tape tension is abnormally high (mechanical lock);

2) The tape is damaged or a foreign object (grease, etc.) is adhered to the

tape (occurrence of tape entangling, etc.).

2.

The capstan FG pulse did not reach the System controller CPU because;

1) The signal circuit is disconnected in the middle;

2) The FG pulse generator (MR device) of the capstans is faulty.

3.

The capstan control voltage (CAPSTAN CTL V) is not supplied to the MDA.

4.

Power is not supplied to the capstan MDA.

1.

The SW 5 V power supply circuit is shorted with GND.

2.

The SW 12 V power supply circuit is shorted with GND.

1. The absolute value sensor is defective. (The soldered parts have separated.)

2. The pull-up resistor at the absolute sensor output is defective. (The soldered parts
have separated.)

3. Contact failure or soldering failure of the pins of the connector (board-to-board) to the
absolute value sensor.

4.

The absolute value sensor data is not sent to the System Controller CPU.

1. The FG sensor is defective. (The soldered parts have separated.)

2. The pull-up resistor at the FG sensor output is defective. (The soldered parts have
separated.)

3. Contact failure or soldering failure of the pins of the connector (board-to-board) to the FG sensor.

4. The power to the sensor is not supplied. (Connection failure/soldering failure)

5. The FG pulse is not sent to the System Controller CPU.

6.

The tilt motor is defective. (The soldered parts have separated.)

7. The drive power to the tilt motor is not supplied. (Connection failure/soldering failure)

8. The tilt motor drive MDA - IC is defective.

9. Auto-recovery of the DD tilting cannot take place due to overrun.

1.

The supply reel pulse is not generated in the FWD transport mode (PLAY/
FWD SEARCH/FF, etc.) because;

1) PLAY/FWD or SEARCH/FF is started while the tape in the inserted cas-

sette is cut in the middle;

2) A mechanical factor caused tape slack inside and outside the supply

reel side of the cassette shell. In this case, the supply reel will not rotate
until the tape slack is removed by the FWD transport, so the pulse is not
generated until then;

3) The FG pulse output from the supply reel sensor is absent.

2.

The take-up reel pulse is not generated in the REV transport mode (REV
SEARCH/REW, etc.).

1) REV SEARCH/REW is started when the tape in the inserted cassette

has been cut in the middle;

2) A mechanical factor caused tape slack inside and outside the take-up

reel side of the cassette shell. In this case, the supply reel will not rotate
until the tape slack is removed by the REV transport, so the pulse will
not be generated until that time;

3) The FG pulse output from the take-up reel sensor is absent.

3.

The power to a reel sensor is not supplied.

1-6

Table 1-6-3a

1.6.4 EMG detail information <1>

The status (electrical operation mode) of the VCR and the sta­tus (mechanism operation mode/sensor information) of the
mechanism in the latest EMG can be confirmed based on the
figure in EMG detail information <1> .

[FDP/OSD display]

* 1 : *2 : 34

* 1 : Deck operation mode at the moment of EMG
* 2 : Mechanism operation mode at the moment of EMG
3– : Mechanism sensor information at the moment of EMG
–4 : Mechanism mod

e position at the moment of EMG

Note:

•

For EMG detailed information <1>, the content of the code
that is shown on the FDP (or OSD) differs depending on
the parts number of the system control microprocessor
(IC3001) of the VCR. The system control microprocessor
parts number starts with two letters, refer these to the cor­responding table.

* 1 : Deck operation mode
[Common table of MN*, HD* and M3*]

Display

MN*/M3* HD*

00 - Mechanism being initialized
01 00 STOP with pinch roller pressure off (or tape present with P.OFF)
02 01 STOP with pinch roller pressure on
03 - POWER OFF as a result of EMG
04 04 PLAY

0C 0E REC

10 11 Cassette ejected
20 22 FF
21 - Tape fully loaded, START sensor ON, short FF
22 - Cassette identification FWD SEARCH before transition to FF (SP

24 26 FWD SEARCH (variable speed) including x2-speed

2C 2E INSERT REC

40 43 REW
42 - Cassette identification REV SEARCH before transition to REW (SP

44 47 REV SEARCH (variable speed)
4C 4C AUDIO DUB
6C 6E INSERT REC (VIDEO + AUDIO)

84 84 FWD STILL / SLOW

85 85 REV STILL / SLOW
8C 8F REC PAUSE
8D - Back spacing

8E - Forward spacing (FWD transport mode with BEST function)
AC AF INSERT REC PAUSE
AD - INSERT REC back spacing
CC CD AUDIO DUB PAUSE
CD - AUDIO DUB back spacing
EC EF INSERT REC (VIDEO + AUDIO) PAUSE
ED - INSERT REC (VIDEO + AUDIO) back spacing

x7-speed)

x7-speed)

Deck operation mode

* 2 : Mechanism operation mode
[Common table of MN* and M3*]

Display

MN* M3*

00 00 Command standby (Status without executing command)
02 02 POWER OFF by EMG occurrence
04 04 Moving to the adjacent position in the LOAD direction
06 06 Moving to the adjacent position in the UNLOAD direction
08 08 Cassette ejection being executed / Cassette housing ejection being

- 0A Mode transition to STOP with cassette ejection end
0A 0C Cassette insertion being executed
0C 0E Tape being loaded
0E 10 Tape being unloaded
10 12 Mode transition to STOP with pinch roller compression ON
12 14 Mode transition to STOP with pinch roller compression OFF
14 16

16 18

18 1A Mode transition to PLAY
1A 1C Mode transition to FWD SEARCH
1C 1E Mode transition to REC
1E 20 Mode transition to FWD STILL / SLOW
20 22 Mode transition to REV STILL / SLOW
22 24 Mode transition to REV SEARCH
24 26 Mode transition from FF / REW to STOP
26 28 Mode transition to FF
28 2A Mode transition to REW
2A 2C 4 sec. of REV as a result of END sensor going ON during loading
2C 2E
2E 30 Mechanism position being corrected due to overrun
80 80 Mechanism in initial position (Dummy command)

executed

Mode transition to STOP with pinch roller compression OFF as a result
of POWER OFF
Mode transition to STOP with pinch roller compression ON as a result
of POWER ON

Short FF / REV as a result of END sensor going ON during unloading

Mechanism operation mode

[Table of HD*]

Display

00 STOP with pinch roller pressure off
01 STOP with pinch roller pressure on
02 U/L STOP (or tape being loaded)
04 PLAY
05 PLAY (x1-speed playback using JOG)
0E REC
11 Cassette ejected
22 FF
26 FWD SEARCH (variable speed) including x2-speed
2E INSERT REC
43 REW
47 REV SEARCH
4C AUDIO DUB
6E INSERT REC (VIDEO + AUDIO)
84 FWD STILL/SLOW
85 REV STILL/SLOW
8F REC PAUSE
AF INSERT REC PAUSE
C7 REV SEARCH (x1-speed reverse playback using JOG)
CD AUDIO DUB PAUSE
EF INSERT REC (VIDEO + AUDIO) PAUSE
F0 Mechanism being initialized
F1 POWER OFF as a result of EMG
F2 Cassette being inserted
F3 Cassette being ejected
F4 Transition from STOP with pinch roller pressure on to STOP with pinch

roller pressure off
F5 Transition from STOP with pinch roller pressure on to PLAY
F6 Transition from STOP with pinch roller pressure on to REC
F7 Cassette type detection SEARCH before FF/REW is being executed
F8 Tape being unloaded
F9 Transition from STOP with pinch roller pressure off to STOP with pinch

roller pressure on
FA Transition from STOP with pinch roller pressure off to FF/REW
FB Transition from STOP with pinch roller pressure off to REC.P (T.REC,etc.)
FC Transition from STOP with pinch roller pressure off to cassette type de-

tection SEARCH
FD Short REV being executed after END sensor on during unloading
FE Tension loosening being executed after tape loading (STOP with pinch

roller pressure on)

Mechanism operation mode

1-7

3– : Mechanism sensor information
[Common table of MN*, HD* and M3*]

Display

MN* / HD* M3* REC safety Start End

S-VHS SW CASS SW SW sensor sensor

0- VHS Cassette insertion Tab broken ON ON
1- VHS Cassette insertion Tab broken ON OFF
2- VHS Cassette insertion Tab broken OFF ON
3- VHS Cassette insertion Tab broken OFF OFF
4- VHS Cassette insertion Tab present ON ON
5- VHS Cassette insertion Tab present ON OFF
6- VHS Cassette insertion Tab present OFF ON
7- VHS Cassette insertion Tab present OFF OFF
8- S-VHS Cassette ejection Tab broken ON ON
9- S-VHS Cassette ejection Tab broken ON OFF
A- S-VHS Cassette ejection Tab broken OFF ON

B- S-VHS Cassette ejection Tab broken OFF OFF
C- S-VHS Cassette ejection Tab present ON ON
D- S-VHS Cassette ejection Tab present ON OFF

E- S-VHS Cassette ejection Tab present OFF ON

F- S-VHS Cassette ejection Tab present OFF OFF

Mechanism sensor information

–4 : Mechanism mode position
[Common table of MN*, HD* and M3*]

Display Mechanism mode position

MN* HD* M3*

-0 -7 - Initial value

-1 -0 - EJECT position

- - -0 EJECT position (Cassette housing drive mode)

-2 -7 - Housing operating

- - -1 Between EJECT and U / L STOP

-3 -1 -2 U / L STOP position

- - -3 Guide arm drive position

-4 -7 -4 Tape being loaded / unloaded (When the pole base is

-5 -2 -5 Tape being loaded / unloaded (When the pole base is

-6 -7 -6 Pole base compressed position

-7 -3 -F FF / REW position

-8 -7 -F Between FF / REW and STOP with pinch roller compres-

-9 -4 -F STOP with pinch roller compression OFF

-A -7 -E Between STOP with pinch roller compression OFF and

-B -5 - REV (REV STILL / SLOW) position

- - -D REV position

- - -C Between REV and REV STILL / SLOW

- - -B REV STILL / SLOW position

-C -7 - Between REV and FWD

- - -A Between REV STILL / SLOW and FWD STILL / SLOW

-D -6 - FWD (FWD STILL / SLOW) position

- - -9 FWD STILL / SLOW position

-E -7 - Between FWD and PLAY

- - -8 Between FWD STILL / SLOW and PLAY

-F -6 -7 PLAY position

located on the front side of the position just beside the
drum)

located on the rear side of the position just beside the
drum)

sion ON

REV

Note:

• In the case of the "HD*” microprocessor, as the display is
always "-7” at any intermediate position between modes,
the position of transitory EMG may sometimes not be lo­cated.

1.6.5 EMG detail information <2>

The type of the cassette tape and the cassette tape winding po­sition can be confirmed based on the figure in EMG detail infor­mation <2> .

[FDP/OSD display]

*5 : *6 : *7

* 5 : Type of the cassette tape in use <1>
* 6 : Winding position of the cassette tape in use
* 7 : Type of th

e cassette tape in use

<2>

(Winding area)

Note:

• EMG detail information <2> is the reference information
stored using the remaining tape detection function of the
cassette tape. As a result, it may not identify cassette cor­rectly when a special cassette tape is used or when the
tape has variable thickness.

* 5 : Cassette tape type <1>

Display Cassette tape type <1>

00 Cassette type not identified
16

Large reel/small reel (T-0 to T-15/T-130 to T-210) not classified
82 Small reel, thick tape (T-120) identified/thin tape (T-140) identified
84 Large reel (T-0 to T-60) identified
92

Small reel, thick tape (T-130) identified/thin tape (T-160 to T-210) identified
93

Small reel, thick tape/C cassette (T-0 to T-100/C cassette) not classified
C3

Small reel, thick tape/C cassette (T-0 to T-100/C cassette) being classified
D3

Small reel, thick tape/C cassette (T-0 to T-100/C cassette) being classified
E1 C cassette, thick tape (TC-10 to TC-20) identified
E2 Small reel, thick tape (T-0 to T-100) identified
E9 C cassette, thin tape (TC-30 to TC-40) identified

C cassette, thick tape/thin tape (TC-10 to TC-40) not classified

F1

Notes:

Cassette tape type

•

<1>

is identified a few times during mode
transition and the identification count is variable depending on
the cassette tape type. If an EMG occurs in the middle of identi­fication, the cassette tape type may not be able to be identified.

•

If other value than those listed in the above table is displayed,
the cassette tape type is not identified.

* 6 : Cassette tape winding position

The cassette tape winding position at the moment of EMG is
displayed by dividing the entire tape (from the beginning to the
end) in 22 sections using a hex number from “00” to “15”.

“00” : End of winding
“15” : Beginning of winding
“FF” : Tape position not identified

* 7 : Cassette tape type <2> (Winding area)

Display Cassette tape type <2>

00 Cassette type not identified

07 Small reel, thick tape T-5
08 - 0E C cassette, thick tape TC-10
09 - 15 C cassette, thick tape TC-20P
0A - 0B Small reel, thick tape T-20
0A - 16 C cassette, thin tape TC-30
0A - 16 C cassette, thin tape TC-40
0D - 0F Small reel, thick tape T-40
11 - 14 Small reel, thick tape T-60
15 - 18 Small reel, thick tape T-80 / DF-160
17 - 1A Small reel, thick tape T-90 / DF-180
19 - 1D Small reel, thick tape T-100
1D - 21 Small reel, thick tape T-120 / DF-240
1E - 1F Small reel, thin tape T-140
1F - 23 Small reel, thick tape T-130
21 - 23 Small reel, thin tape T-160
21 - 23 Small reel, thin tape T-168
22 - 24 Small reel, thick tape DF-300
22 - 24 Small reel, thin tape T-180 / DF-360
22 - 24 Small reel, thin tape T-210 / DF-420
22 - 23 Large reel T-5
23 - 24 Large reel T-10
25 - 26 Large reel T-20
27 - 29 Large reel T-30
29 - 2B Large reel T-40
2D - 2F Large reel T-60

Note:

•

The values of cassette tape type <2> in the above table
are typical values with representative cassette tapes.

1-8

SECTION 2

Roller driver

PTU94002

A/C head positioning tool

PTU94010

Back tension cassette gauge

PUJ48076-2

Jig RCU

PTU94023B

Torque gauge

PUJ48075-2

Alignment tape

(EP, stairstep, NTSC)

MHP-L

Alignment tape

(SP, stairstep, PAL)

MHPE

Alignment tape

(SP, stairstep, NTSC)

MHP

Alignment tape

(LP, stairstep, PAL)

MHPE-L

MECHANISM ADJUSTMENT

2.1 Before starting repair and adjustment

2.1.1 Precautions

(1) Unplug the power cord plug of the VCR before using your

soldering iron.

(2) Take care not to cause any damage to the conductor

wires when plugging and unplugging the connectors.

(3) Do not randomly handle the parts without identifying

where the trouble is.

(4) Exercise enough care not to damage the lugs, etc. dur-

ing the repair work.

(5) Install the cassette housing assembly only when the

mechanism is in the “Mechanism assembling mode” po­sition. (See 2.2.2.)

(6) When reattaching the front panel assembly, make sure

that the door opener of the cassette housing assembly
is lowered in position prior to the reinstallation. (See SEC­TION 1 DISASSEMBLY.)

(7) When checking the operation or performing adjustments

to the VCP main unit, it is necessary to connect the power
cable (Car Cable) to the VCP main unit so that DC power
is supplied. Also, when using the remote control unit, it
is required to connect the IR receiver. (by using either
the provided or optional accessories)

Loading motor

Guide arm assembly

Pole base bssembly

Fig. 2-1-3a

2.1.2 Checking for proper mechanical operations

Enter the mechanism service mode when you want to oper­ate the mechanism when no cassette is loaded. (See 1.5
Mechanism service mode.)

2.1.3 Manually removing the cassette tape

If you cannot remove the cassette tape which is loaded be­cause of any electrical failure, manually remove it by taking
the following steps.

(1) Unplug the power cord plug from the power outlet.
(2) Refer to the disassembly procedure and perform the dis-

assembly of the major parts before removing the Cas­sette housing assembly.

(3) Unload the pole base assembly by manually turning the

loading motor of the mechanism assembly toward the
front. In doing so, hold the tape by the hand to keep the
slack away from any grease. (See Fig.2-1-3a.)

(4) Bring the pole base assembly and guide arm assembly

to a pause when it reaches the position where it is hid­den behind the cassette tape.

(5) Remove the cassette housing assembly by holding both

the slackened tape and the cassette lid.

(6) Take up the slack of the tape into the cassette. This com-

pletes removal of the cassette tape.

Note:

• For the disassembly procedure of the major parts and
details of the precautions to be taken, see “1.3 Disas­sembly/assembly method”.

2.1.4 Jigs and tools required for adjustment

2-1

2.1.5 Maintenance and inspection

1. Location of major mechanical parts

Stator Assembly

Guide Rail

FE Head

Tension Arm Assembly

Pole Base Assembly (SUP)

Control Plate

Tension Band Assembly

Slide Plate

Drum Assembly

Reel Disk Assembly
(SUP)

A/C Head

Capstan Motor

Reel Disk Assembly (TU)

Pole Base Assembly (TU)

Fig. 2-1-5a Mechanism assembly top side

Loading Motor

Belt (Loading Motor)
Pinch Roller Arm Assembly

Guide Arm Assembly

Lever Assembly

Control Cam

Change Lever Assembly

Rotary Encoder

Belt (Capstan)

Fig. 2-1-5b Mechanism assembly bottom side

2-2

2. Cleaning

Regular cleaning of the transport system parts is desirable
but practically impossible. So make it a rule to carry out clean­ing of the tape transport system whenever the machine is
serviced.
When the video head, tape guide and/or brush get soiled,
the playback picture may appear inferior or at worst disap­pear, resulting in possible tape damage.

(1) When cleaning the upper drum (especially the video

head), soak a piece of closely woven cloth or Kimu-wipe
with alcohol and while holding the cloth onto the upper
drum by the fingers, turn the upper drum
counterclockwise.

Note:

• Absolutely avoid sweeping the upper drum vertically
as this will cause damage to the video head.

(2) To clean the parts of the tape transport system other than

the upper drum, use a piece of closely woven cloth or a
cotton swab soaked with alcohol.

(3) After cleaning, make sure that the cleaned parts are com-

pletely dry before using the video tape.

3. Lubrication

With no need for periodical lubrication, you have only to lu­bricate new parts after replacement. If any oil or grease on
contact parts is soiled, wipe it off and newly lubricate the
parts.

Note:

• See the “mechanism assembly” diagram of the parts
list for the lubricating or greasing spots, and for the
types of oil or grease to be used.

• Grease is not required for a replacement cassette hous­ing assembly, as this has been applied at the factory.

4. Suggested servicing schedule for main components

The following table indicates the suggested period for such
service measures as cleaning,lubrication and replacement.
In practice, the indicated periods will vary widely according
to environmental and usage conditions.However, the indi­cated components should be inspected when a set is brought
for service and the maintenance work performed if neces­sary. Also note that rubber parts may deform in time,even if
the set is not used.

System Parts Name

Upper drum assembly

A/C head

Lower drum motor assembly

Pinch roller arm assembly

Full erase head

Tension arm assembly

Tape transport

Guide arm assembly

Capstan motor

Belt (Capstan)

Belt (Loading motor)

Loading motor

Reel disk (supply, take up)

Drive

Clutch unit (supply, take up)

Worm gear assembly

Control plate

Slide plate

Brush

Tension band assembly

Other

Rotary encoder

Operation Hours

~1000H ~2000H

: Cleaning

¤

: Inspection or replacement if necessary

R

Table 2-1-5a

2-3

2.2 Replacement of major parts

5.7mm

Head base

A/C head

2.2.1 Before starting disassembling

This mechanism has an exclusive operation mode provided
for disassembling and installation of the mechanism (Mecha­nism assembling mode), and it is suggested to set the
mechanism to this mode before disassembly and
installation.The “Mechanism assembling mode” is not gen­erally used and becomes available by manual setting only.
Then this procedure starts with the condition that the cabi­net parts and cassette housing assembly have been re­moved.

A/C head

(B)

A/C head
board

Pressure spring

Head base

2.2.2 How to set the “Mechanism assembling mode”

(1) Turn the loading motor belt by hand.
(2) Confirm that the hole of the control cam are aligned to

the deck hole as shown in Fig.2-2-2a.

Loading motor belt

Hole align with
hole in deck

Control cam

Fig. 2-2-2a

2.2.3 Pinch roller arm assembly

(1) Remove the slit washer.
(2) Lift the pinch roller arm assembly, and pull out it while

pushing the pinch plate toward outside.

Slit washer

Pinch roller
arm assembly

Fig.2-2-4b

2. How to install

(1) Temporarily set tne A/C head height as indicated in Fig.

2-2-4c.

Fig.2-2-4c

2.2.5 Pinch plate

1. How to remove

(1) Disengage the 2 claws, then remove the pinch plate.

Pinch plate

Claw

Claw

Pinch plate

Fig.2-2-3a

2.2.4 A/C head

1. How to remove

(1) Take out the 2 screws (A).
(2) Remove the A/C head with the head base.
(3) When replacing the A/C head only,remove the 3 screws

(B), use care not to misplace the 3 springs.

(A)

Fig.2-2-4a

2-4

Head base

(A)

Fig. 2-2-5a

2. How to install

(1) When installing the pinch plate,align rack of the pinch

plate and triangle mark of the control cam as indicated
in Fig. 2-2-5b.

Pinch plate

Control cam

Correct direction

Fig. 2-2-5b

2.2.6 Loading motor

(1) Remove the belt from the worm gear assembly.
(2) Take out the 2 screws (A) and then remove the loading

motor.

Note:

• When installing the loading motor, hold it so that the
label faces upward. Also take care with the wire colors.

(B)

(B)

Sub deck assembly

Red line
(to pin 1 of connector
for the loading motor)

Loading motor

Worm gear assembly

Label (Top view)

(A)

(A)

Belt

Fig.2-2-6a

Lever assembly, sub deck assembly, capstan motor

2.2.7

(1) First remove the belt from the rear side (capstans) of the

mechanism assembly.

(2) Take out the slit washer, then remove the lever assem-

bly.

(3) Take out the 3 screws (A), then remove the capstan mo-

tor and sub deck assembly together.

(4) Take out the 3 screws (B), then remove the capstan mo-

tor from the sub deck assembly.

Note:

• Before removing the capstan brake assembly, it is re­quired to first remove the worm gear assembly and the
control cam.

Capstan motor

Fig.2-2-7c

2.2.8 Control bracket

(1) Take out the screw (A) and screw (B).
(2) Remove the control bracket.

(A)

(B)

Control bracket

Mechanism assembly

Sub deck
Assembly

Back side

Belt

Fig.2-2-7a

(A)

Fig.2-2-7b

Fig.2-2-8a

2.2.9 Reel disk assembly (take up)

(1) Take out the slit washer.
(2) Remove the reel disk assembly (take up).

Slit washer

Slit washer

Reel disk assembly (take up)

Lever assembly

Fig.2-2-9a

2-5

Reel disk assembly (take up)

Fig.2-2-9b

2.2.10 Control plate

(1) Take out the slit washer, disengage the 2 hooks while

lifting the control cam side of the control plate, and re­move the control plate.

Notes:

• After removing the control plate, be careful not to turn
the main deck assembly upside down. Otherwise, parts
such as the idler lever and clutch unit (take up) may
slip out.

• After removing the control plate, the parts shown in the
following figure can be removed. The numbers [ * ] in­dicate the removal sequence.

Control plate Slit washer

Claw

Hook

Control cam

(a)

Sub brake assembly
(take up)

(a)

Spring

Fig.2-2-11a

2.2.12 Slide plate

(1) Disengage the 7 claws on the back side of the mecha-

nism assembly by following the order from the claw on
one end to that on the opposite end, then remove the
slide plate.

Note:

• After removing the slide plate, it is possible to remove
the main brake assembly (take up) and the change arm
assembly.

Hook

Slit washer

[2]

Ider arm assembly

Hook

[1]

Idler lever

[3]

Clutch unit
(take up)

[4]

Slit disk
(take up)

Fig.2-2-10a

2.2.11 Sub brake assembly (take up), control cam

(1) Disengage the spring (a) of the sub-brake assembly (take

up) and, while pushing the hook in the direction of the
arrow, remove the sub brake assembly (take up) upward.

(2) While pushing the claw in the disengaging direction, re-

move the control cam.

< Back side of mechanism assembly >

Remove the claws
in order of arrow.

Claw

Claw

Claw

Fig.2-2-12a

Change arm
assembly

Main brake assembly
(take up)

Slide plate

Belt

2-6

Fig.2-2-12b

2.2.13 Change lever assembly, rotary encoder

(1) Slide the change lever assembly in the direction of the

arrow and remove.

(2) While pushing the claws on both sides in the disengag-

ing directions, take out the rotary encoder.

(3) When attaching the rotary encoder, position it so that the

alignment markings face each other as shown in Fig. 2­2-13a, then attach the rotary encoder.

Notes:

• Before removing the change lever assembly, it is re­quired to remove the belt (Fig. 2-2-12a).

• Take care of the cassette gear, which is disengaged at
the same time as the change lever assembly is re­moved.

Position

Claw

Align the
triangle marks

Rotary encoder

Claw

Tension arm assembly

Tension arm assembly

Slit washer

Tension band
assembly

Claw

Tension arm lever

Note

Take up lever Clutch unit (supply)

Slit disk (supply)

Hook

(c)

Hook

(c)

(a)

Main brake
assembly
(supply)

(a)

Sub brake assembly (supply)

Claw

(b)

Reel disk assembly
(supply)

Slit washer

Cassette gear

Change lever assembly

Fig.2-2-13a

2.2.14

Tension arm assembly, tension band assembly,
reel disk assembly (supply), sub brake assembly

(supply), clutch unit (supply), take up lever

(1) Disengage the spring (a) of the sub brake assembly (sup-

ply) from the hook.
(2) Disengage the spring (c) from the hook.
(3) Take out the slit washer, and remove the tension arm

assembly. Also remove the tension band assembly by

disengaging the claw.
(4) Take out the slit washer, and remove the reel disk as-

sembly (supply).
(5) While pushing the claw in the disengaging direction, re-

move the sub brake assembly (supply).
(6) Remove the clutch unit (supply).
(7) Remove the take up lever assembly.

Notes:

• When attaching the tension arm assembly, be sure to

adjust the phase of the tension arm lever.

• After removing the clutch unit (supply), it is possible

to remove the slit disk (supply) and main brake assem­bly (supply).

Fig.2-2-14a

2.2.15 Take up head, tension arm lever

(1) Remove the take up head and tension arm lever.

Tension arm lever

Take up head

Alignment holes

Fig.2-2-15a

2-7

2.2.16 Guide rail

(1) Take out the 5 screws (A) and 1 screw (B).
(2) By expanding the rails on the outer sides of the guide

rail, remove the 2 pole base assemblies (supply, take up).

(3) Disengage the 4 claws and remove the guide rail.

Note:

• Before removing the guide rail, it is required to remove
the drum assembly.

Pole base assembly

(A)

Claw

(A)

(B)

Claw

(A)

(A)

(A)

2.2.18 Rotor assembly

1. How to remove

(1) Remove the stator assembly.
(2) Remove the two screws (B) and remove the rotor assem-

bly.

2. How to install

(1) Match the phases of the upper drum assembly and the

rotor assembly as indicated in Fig.2-2-18a.

(2) Place the upper drum assembly hole (a) over the rotor

assembly holes (b) (with three holes to be aligned) and
tighten the two screws (B). (See Fig.2-2-18a.)

Note:

• When installing the rotor assembly, note that a normal
picture cannot be obtained without ensuring the phase
matching as mentioned below.

Guide rail

Claw

Claw

Fig.2-2-16a

2.2.17 Stator assembly

(1) Remove the flat cable.
(2) Remove the two screws (A), (B) and remove the lug wire.
(3) Remove the stator assembly by lifting in the arrow-indi-

cated direction. (Take care that the brush spring does not
jump out.)

Notes:

• Be careful not to lose the brush and spring.

• There are some models that do not use the lug wire.

Refer to the parts list for these models.

• When tightening the screw (B), place the caulked part
of the lug terminal near to the shaft of the drum and
then tighten it.

• After installation, be sure to perform the switching
point adjustment according to the electrical adjustment
procedure.

Screw (A)

Stator
assembly

Screw (B)

Lug wire
(Note)

Spring

Brush

Drum
shaft

Flat cable
(Take care not to mix up the
polar faces when installing.)

Lug wire

Screw (A)

Screws (B)

Screw holes

Upper drum
assembly

Rotor assembly

Hole(a)

The hole is not in
line but is offset
toward the right.

Hole(b)

Fig.2-2-18a

2.2.19 Upper drum assembly

Notes:

• To replace the upper drum assembly only may not be
possible with some models. For upper drum assem­bly replacement, refer to the parts list. (When the parts
number of the upper drum assembly is not listed on
the parts list, then this cannot be replaced.)

• When replacement is required, control the up- down
movement of the brush. Never apply grease.

• When replacing the upper drum assembly, replace it
the together with the washer.

1. How to remove

(1) Remove the stator assembly and rotor assembly.
(2) Loosen the screw of the collar assembly using a 1.5 mm

hexagonal wrench and remove the collar assembly. Also
remove the brush, spring and cap at one time.

(3) Remove the upper drum assembly and remove the

washer using tweezers.

Fig.2-2-17a

2-8

Spring

Brush

Upper drum
assembly

Washer

Collar
assembly

Loosen

Cap

1.5 mm
hexagonal wrench

Shaft

Lower drum assembly

Fig. 2-2-19a

2. How to install

(1) Clean the coil parts of the lower drum assembly and the

newly installed upper drum assembly with an air brush
in advance. (See Fig.2-2-19b.)

(2) Install a new washer and upper drum assembly on the

drum shaft. (See Fig.2-2-19a.)
(3) Install the cap to the upper drum assembly.
(4) Position the collar assembly as indicated in Fig.2-2-19c

while controlling its up- down movement.
(5) Secure the collar assembly in position with a hexagonal

wrench while pressing its top with the fingers.
(6) After installation, gently turn the upper drum assembly

with your hand to make sure that it turns normally. Then

install the brush and the spring.
(7) Install the rotor assembly and stator assembly according

to Fig 2-2-17a and 2-2-18a.
(8) When installation is complete, clean the upper drum as-

sembly and lower drum assembly and carry out the fol-

lowing adjustments.

• PB switching point adjustment

• Slow tracking adjustment

• Compatibility adjustment (Be sure to check for compat-

ibility for the EP (or LP) mode.)

Lower drum assembly

Collar

Upper drum
assembly

assembly

Fig. 2-2-19c

Press

Collar
assembly

Tighten

Fig. 2-2-19d

2.3 Installation of major parts (Mechanism phase align­ment)

2.3.1 Before assembly

The mechanism of this model is closely related with the ro­tary encoder and the system control circuitry. The connec­tion between the rotary encoder and control cam determines
the movement of all mechanical parts including the slide
plate, loading arm assembly, control plate and brake. If these
parts are not installed in the correct positions, operations such
as loading and unloading will not be possible.
Installation of the major parts (mechanism phase alignment)
should be performed exclusively in the mechanism assem­bling mode, as with the operations in the previous sections.

Coil parts

Fig. 2-2-19b

Upper drum assembly

2-9

2.3.2 Loading arm assemblies (supply, take up)

(1) Attach the loading arm assembly (supply) and loading arm

assembly (take up) so that the alignment markings on
their gears face each other and the holes on their arms
are respectively aligned with the holes on the main deck.

(2) Attach the guide rail, attach the pole base assemblies onto

the extremities of the arms, then perform the unloading
operation so that the pole base assemblies come to the
most forward positions.

Note:

• When attaching the pole base assemblies (supply/take
up), temporarily tighten the 3 screws other than the 2
screws on the sides of the guide rail extremities so that
the parts do not slip out.

(3) Attach the surrounding parts of the guide rail.

Position

Claw

Align the
triangle marks

Rotary encoder

Claw

Loading arm assembly (supply)

To pole base
assembly

Holes align with
hole in deck

To pole base assembly

Correct direction

Loading arm
assembly
(take up)

Holes align with
hole in deck

Holes align with
hole in deck

Change lever assembly

Fig. 2-3-3a

Capstan brake assembly

Holes align with
hole in deck

Control cam

Fig. 2-3-3b

2.3.4 Slide plate

(1) While pushing down the main brake assemblies (supply,

take up) so that they come in contact with the extremity
of the mechanism assembly, attach the slide plate so that
its alignment holes are aligned with the holes of the
mechanism assembly.

Note:

• Free the spring of the sub brake assembly (supply) dur­ing installation.

Correct direction

Fig. 2-3-2a

2.3.3

Rotary encoder, change lever assembly, control cam

(1) To attach the rotary encoder, align the triangular align-

ment markings and push the rotary encoder in until the
claws are locked.

(2) To attach the change lever assembly, align its holes with

the holes on the mechanism assembly. As the change
lever assembly is projected on the rear side of the mecha­nism assembly, take care that the assemblies are not
separated from each other.

(3) To attach the control cam, align its holes with the holes

on the mechanism assembly by pushing the capstan
brake assembly downward.

2-10

Main brake assembly (supply)

Main brake assembly (take up)

Set main brake assemblies to
brake off position

Holes align with hole in deck

Fig. 2-3-4a

Slide plate

2.3.5 Control plate

(1) Attach the control plate by aligning the 2 alignment holes

on the control plate with the alignment holes on the main
deck assembly as well as the alignment holes on the take
up lever. As the take up lever is pulled by a tension spring,
use a pair of tweezers or similar too to align the holes.

(2) After attaching the control plate, lock it with the slit washer

and control bracket.

2.4 Mechanism timing chart

MODE

C-LOAD

C-INS W-FWD FWD S.FWD S.REV STOP FF/REWREV

Holes align with
holes in deck

Hole of take up lever align
with hole in deck

Fig. 2-3-5a

Control braket

Control plate

Slit washer (red)

PARTS

SLIDE PLATE

CONTROL CAM

LSA

LAB

LSC

A

ROTARY
ENCODER

POLE BASE ASSY

PINCH ROLLER CAM
(UP/DOWN)

PINCH ROLLER
(CAPSTAN)

TENSION ARM ASSY

TENSION ARM
(SPRING)

SUP
IDLER
TU

IDLER
(UP/DOWN)

GUIDE ARM

MAIN BRAKE ASSY
(SUP)

MAIN BRAKE ASSY
(TU)

SUB BRAKE ASSY
(SUP)

SUB BRAKE ASSY
(TU)

CAPSTAN BRAKE

C. HOUSING GEAR

TU LEVER

B

C

CENTER

0 W

0 mm0°4 mm

30.6°

LOADING

21 mm

160.4°

F

24 mm

183.3°

26 mm

198.6°

R S FF

32 mm

34 mm

37.5 mm

244.5°

259.7°

286.5°

43 mm

328.5°

UP

DOWN

PRESS

FREE

LOAD END

UN LOAD END

ON
W ON
PRELOAD
OFF

SUP

TU

UP

DOWN

ON

OFF

ON

OFF

ON
CONTACT
OFF

ON
CONTACT
OFF

ON

OFF

ON

OFF

MECHANISM

MODE

ASSEMBLY EJECT

NOT USED

Table 2-4a

PLAY
REC
REC. P
STOP
F. FF

SLOW (FWD)
STILL (FWD)

SLOW (REV)
STILL (REV)

S. REW
BACK
SPACE

STOP
MECHA

SERVICE

FF/REW

2-11

2.5 Compatibility adjustment
Notes:

• Although compatibility adjustment is very important,
it is not necessary to perform this as part of the nor­mal servicing work. It will be required when you have
replaced the audio control head, drum assembly or any
part of the tape transport system.

• To avoid any damage to the alignment tape while per­forming the compatibility adjustment, get a separate
cassette tape (for recording and play back) ready to
be used for checking the initial tape running behavior.

• Unless otherwise specified, all measuring points and
adjustment parts are located on the Main board.

• When using the Jig RCU, set its custom code to match
the custom code of the VCR.

Jig RCU

[Data transmitting method]
Depress the “ ” ( 3 ) button
after the data code is set.

(7) Make sure that the V.PB FM waveform varies in parallel

and linearly with the tracking operation again. When re­quired, perform fine-adjustment of the guide roller of the
pole base assembly (supply or take-up side).

(8) Unload the cassette tape once, play back the alignment

tape (A1) again and confirm the V.PB FM waveform.

(9) After adjustment, confirm that the tape wrinkling does not

occur at the roller upper or lower limits. (See Fig. 2-5­1d.)

(10)After completing adjustment, tighten the set screw at the

bottom of the pole base assembly. (Be careful not to
tighten it too much.) (See Fig. 2-5-1b.)

[Perform adjustment step (11) only for the models

equipped with SP mode and EP (or LP) mode.]

(11) Repeat steps (1) to (10) by using the alignment tape (A2).

CUSTOM CODE
43: A CODE
53: B CODE

DATA CODE

INITIAL MODE

Fig. 2-5a Jig RCU [PTU94023B]

2.5.1 FM waveform linearity

Signal (A1) •

Mode (B) • PB
Equipment (C) • Oscilloscope
Measuring point (D) • TP106 (PB FM)
External trigger (E) • TP111 (D.FF)
Adjustment part (F) • Guide roller [Mechanism assembly]
Specified value (G) • Flat V.PB FM waveform
Adjustment tool (H) • Hexagonal wrench (1.25 mm)

[KV-V8E]

(A2) •

(A1) •
(A2) •

Alignment tape(SP, stairstep, PAL) [MHPE]
Alignment tape(LP, stairstep, PAL) [MHPE-L]

-----------------------------------------

[KV-V8J]

Alignment tape(SP, stairstep, NTSC) [MHP]
Alignment tape(EP, stairstep, NTSC) [MHP-L]

• Roller driver [PTU94002]

(1) Play back the alignment tape (A1).
(2) Apply the external trigger signal to D.FF (E), to observe

the V.PB FM waveform at the measuring point (D).
(3) Set the VCR to the manual tracking mode.
(4) Make sure that there is no significant level drop of the

V.PB FM waveform caused by the tracking operation, with

its generally parallel and linear variation ensured. Per-

form the following adjustments when required. (See Fig.

2-5-1a.)
(5) Using a hexagonal wrench, gently loosen the set screw

at the bottom of the pole base assembly. (Be careful not

to loosen it too much.) (See Fig. 2-5-1b.)
(6) Reduce the V.PB FM waveform by the tracking opera-

tion. If a drop in level is found on the left side, turn the

guide roller of the pole base assembly (supply side) with

the roller driver to make the V.PB FM waveform linear.

If a drop in level is on the right side, likewise turn the guide

roller of the pole base assembly (take-up side) with the

roller driver to make it linear. (See Fig. 2-5-1c.)

Max level

Proper waveform variation

Improper waveform variation

Fig. 2-5-1a

Roller driver

Hexagonal wrench

Loosen

1.25mm

Fig. 2-5-1b

Min level

Guide roller

Tighten

2-12

A

B

waveform by turning the screws (1), (2) and (3) little by
little until both waveforms reach maximum. The screw (1)
and (3) are for adjustment of tilt and the screw (2) for azi­muth.

(4) Adjust the AUDIO OUT waveform and Control pulse

Level drop at the guide roller (supply side)

C

Level drop at the guide roller (take-up side)

• Proper waveform variation: Always flat

• Improper waveform variation:
Higher Lower

Fig. 2-5-1c

Improper Proper

( a ) Guide roller

( b ) Guide pole

(2)

D

(3)

(1)

Guide pole (T.U)

Guide pole (T.U)

bottom

flange

Audio out

CTL.P

Fig. 2-5-2a

2.5.3 A/C head phase (X-value)

Signal (A) •

Mode (B) • PB
Equipment (C) • Oscilloscope
Measuring point (D) • TP106 (PB FM)
External trigger (E) • TP111 (D.FF)
Adjustment part (F) •
Specified value (G) • Maximum V.PB FM waveform
Adjustment tool (H) • A/C head positioning tool [PTU94010]

[KV-V8E]

Alignment tape(SP, stairstep, PAL) [MHPE]

-----------------------------------------

[KV-V8J]

(A) •

Alignment tape(SP, stairstep, NTSC) [MHP]

A/C head base [Mechanism assembly]

Fig. 2-5-1d

2.5.2 Height and tilt of the A/C head

Note:

• Set a temporary level of the height of the A/C head in
advance to make the adjustment easier after the A/C
head has been replaced. (See Fig.2-2-4c.)

Signal (A) •

Mode (B) • PB
Equipment (C) • Oscilloscope
Measuring point (D1) • AUDIO OUT terminal

External trigger (E) • TP111 (D.FF)
Adjustment part (F) • A/C head [Mechanism assembly]
Specified value (G) • Maximum waveform

[KV-V8E]

Alignment tape(SP, stairstep, PAL) [MHPE]

-----------------------------------------

[KV-V8J]

(A) •

Alignment tape(SP, stairstep, NTSC) [MHP]

(D2) • TP4001 (CTL. P)

(1) Play back the alignment tape (A).
(2) Apply the external trigger signal to D.FF (E), to observe

the AUDIO OUT waveform and Control pulse waveform
at the measuring points (D1) and (D2) in the ALT mode.

(3) Set the VCR to the manual tracking mode.

(1) Play back the alignment tape (A1).
(2) Apply the external trigger signal to D.FF (E), to observe

the V.PB FM waveform at the measuring point (D).
(3) Set the VCR to the manual tracking mode.
(4) Loosen the screws (4) and (5), then set the A/C head

positioning tool to the projected part in front of the A/C

head. (See Fig. 2-5-3a.)
(5) Turn the A/C head positioning tool fully toward the cap-

stan. Then turn it back gradually toward the drum and

stop on the first peak point position of the V.PB FM wave-

form output level. Then tighten the screws (4) and (5).
(6) Perform the tracking operation and make sure that the

V.PB FM waveform is at its maximum.

If it is not at maximum, loosen the screws (4) and (5),

and turn the A/C head positioning tool to bring the A/C

head to a position, around where the waveform reaches

its maximum for the first time. Then tighten the screws

(4) and (5).

2-13

[Perform adjustment steps (7) to (10) only for 2 Head

models equipped with LP mode.]

(7) Then play back the alignment tape (A2).
(8) Set the VCR to the manual tracking mode.
(9) Perform the tracking operation and make sure that the

V.PB FM waveform is at its maximum.

(10)

If it is not at maximum, loosen the screws (4) and (5),
and turn the A/C head positioning tool to bring the A/C
head to a position, around where the waveform reaches
its maximum for the first time. Then tighten the screws
(4) and (5).

Note:

• After adjusting, always perform the confirmation and
re-adjustment of the item 2.5.4.

A/C head
positioning tool

A/C head

(5)

To the drum

To the capstan

(4)

(5)

(4)

Fig. 2-5-3a

Alignment tape
[SP, stairstep]
played with the
SP head

Alignment tape
[EP(LP), stairstep]
played with the
EP(LP) head

(1) Play back the alignment tape (A).
(2) Apply the external trigger signal to D.FF (E), to observe

the V.PB FM waveform at the measuring point (D).

(3) Confirm that the automatic tracking operation is com-

pleted.

(4) Set the VCR to the Auto adjust mode by transmitting the

code (F) twice from the Jig RCU. When the VCR enters
the stop mode, the adjustment is completed.

(5) If the VCR enters the eject mode, perform adjustment for

the A/C head phase (X-value) again.

2.5.5 Tension pole position

Signal (A) • Back tension cassette gauge

[PUJ48076-2]

Mode (B) • PB
Adjustment part (F) • Adjust pin [Mechansim assembly]
Specified value (G) • 29 - 46 gf•cm (2.84 – 4.5 × 10-3 Nm)

(1) Play back the back tension cassette gauge (A).
(2) Check that the indicated value on the left side gauge is

within the specified value (G).

(3) If the indicated value is not within the specified value (G),

perform the adjustment in a following procedure.

1) Set the VCR to the mechanism service mode. (See

1.5 Mechanism service mode.)

2) Set the VCR to the play back mode and turn the ad­just pin using the flat-blade screwdriver, etc. by pay­ing attention not to come into contact with the 2.5 mm
dia. pole. (See Fig. 2-5-5a.)

Waveform output

X-value adjustment point

Drum side Control head position Capstan side

Fig. 2-5-3b

2.5.4 Standard tracking preset

Signal (A) •

Mode (B) • PB ¥ Auto adjust
Equipment (C) • Oscilloscope
Measuring point (D) • TP106 (PB FM)
External trigger (E) • TP111 (D.FF)
Adjustment part (F) • Jig RCU: Code “50”
Specified value (G) • STOP mode

Adjustment tool (H) • Jig RCU [PTU94023B]

[KV-V8E]

Alignment tape(LP, stairstep, PAL) [MHPE-L]

-----------------------------------------

[KV-V8J]

(A) •

Alignment tape(EP, stairstep, NTSC) [MHP-L]

(Maximum V.PB FM waveform)

Maximum

Tension arm assembly

2.5 pole

Fig. 2-5-5a

Adjust pin

2-14

SECTION 3

ELECTRICAL ADJUSTMENT

3.1 Precaution

The following adjustment procedures are not only necessary
after replacement of consumable mechanical parts or board
assemblies, but are also provided as references to be re­ferred to when servicing the electrical circuitry.
In case of trouble with the electrical circuitry, always begin a
service by identifying the defective points by using the meas­uring instruments as described in the following electrical ad­justment procedures. After this, proceed to the repair, replace­ment and / or adjustment. If the required measuring instru­ments are not available in the field, do not change the adjust­ment parts (variable resistor, etc.) carelessly.

3.1.1 Required test equipments

• Color (colour) television or monitor

• Oscilloscope: wide-band, dual-trace, triggered delayed
sweep

• Digit-key remote controller (provided)

3.1.2 Required adjustment tools

Jig RCU

PTU94023B

Alignment tape

(SP, stairstep, PAL)

MHPE

Alignment tape

(SP, stairstep, NTSC)

MHP

Alignment tape

(LP, stairstep, PAL)

MHPE-L

Alignment tape

(EP, stairstep, NTSC)

MHP-L

Alignment tape

(SP, color (colour) bar, NTSC)

MH-1

• Unless otherwise specified, all measuring points and
adjustment parts are located on the Main board.

• When checking the operation or performing adjust­ments to the VCP main unit, it is necessary to connect
the power cable (Car Cable) to the VCP main unit so
that DC power is supplied. Also, when using the re­mote control unit, it is required to connect the IR re­ceiver. (by using either the provided or operational ac­cessories)

3.2 Servo circuit

3.2.1 Switching point

Signal (A1) • Stairstep signal

Mode (B) • PB

Equipment (C) • Oscilloscope

Measuring point (D1) •

External trigger (E) • TP111 (D.FF)

Adjustment part (F) • Jig RCU: Code “5A”

Specified value (G) •

Adjustment tool (H) • Jig RCU [PTU94023B]

-----------------------------------------

[KV-V8E]

(A2) •

(A2) •

Alignment tape (SP, stairstep, PAL) [MHPE]

-----------------------------------------

[KV-V8J]

Alignment tape (SP, stairstep, NTSC) [MHP]

VIDEO OUT terminal (75Ø terminated)

(D2) • TP106 (PB FM)

[KV-V8E]

6.5 ± 0.5 H (SP, stairstep, PAL) [MHPE]

-----------------------------------------

[KV-V8J]

(G) •

6.5 ± 0.5 H (SP, stairstep, NTSC) [MHP]

Alignment tape

(EP, color (colour) bar, NTSC)

MH-1L

Alignment tape

(SP, color (colour) bar, PAL)

MH-2

Alignment tape

(LP, color (colour) bar, PAL)

MH-2L

3.1.3 Switch settings and standard precautions

The SW settings of the VCR and the standard precautions
for the electrical adjustments are as follows.

•

When using the Jig RCU, set its custom code to match
the custom code of the VCR.

Jig RCU

[Data transmitting method]
Depress the “ ” ( 3 ) button
after the data code is set.

CUSTOM CODE
43: A CODE
53: B CODE

DATA CODE

INITIAL MODE

(1) Play back the signal (A1) of the alignment tape (A2).
(2) Apply the external trigger signal to D.FF (E) to observe

the VIDEO OUT waveform and V.PB FM waveform at the

measuring points (D1) and (D2).
(3) Set the VCR to the manual tracking mode.
(4) Adjust tracking so that the V.PB FM waveform becomes

maximum.
(5) Set the VCR to the Auto adjust mode by transmitting the

code (F) from the Jig RCU. When the VCR enters the

stop mode, the adjustment is completed.
(6) If the VCR enters the eject mode, repeat steps (1) to (5)

again.
(7) Play back the alignment tape (A2) again, confirm that the

switching point is the specified value (G).

Trigger point

Switching point

V.sync

V. rate

Fig. 3-2-1a Switching point

Fig. 3-1-3a Jig RCU [PTU94023B]

3-1

3.2.2 Slow tracking preset

Signal (A1) • Color (colour) bar or stairstep signal

Measuring point (D) • TV-Monitor

Adjustment part (F) • Jig RCU: Code “71” or “72”

Specified value (G) • Minimum noise

Adjustment tool (H) • Jig RCU [PTU94023B]

-----------------------------------------

[KV-V8E]
(A2) • Alignment tape [MH-2] or [MHPE]
(A3) • Alignment tape [MH-2L] or [MHPE-L]

-----------------------------------------

[KV-V8J]
(A2) • Alignment tape [MH-1] or [MHP]
(A3) • Alignment tape [MH-1L] or [MHP-L]

(1) Play back the signal (A1) of the alignment tape (A2).
(2) Set the VCR to the manual tracking mode.
(3) Set the VCR to the FWD slow (+1/6x) mode.
(4) Transmit the code (F) from the Jig RCU to adjust so that

the noise bar becomes the specified value (G) on the TV

monitor in the slow mode.
(5) Set the VCR to the Stop mode.
(6) Confirm that the noise bar is (G) on the TV monitor in

the slow mode.
(7) Repeat steps (3) to (6) in the REV slow (-1/6x) mode.
(8) Play back the signal (A1) of the alignment tape (A3).
(9) Repeat steps (2) to (7).

Note:

•

For FWD slow (+1/6x) playback, transmit the code “08”
from the Jig RCU to enter the slow playback mode, and
transmit the code “D0” for REV slow (-1/6x) mode.

3-2

KV-V8

VICTOR COMPANY OF JAPAN, LIMITED

MOBILE ELECTRONICS DIVISION
PERSONAL & MOBILE NETWORK BUSINESS UNIT. 10-1,1Chome,Ohwatari-machi,Maebashi-city,Japan

No.49625

Printed in Japan
200102(S)