SERVICE MANUAL

MOBILE VIDEO CASSETTE PLAYER

KV-V8

KV-V8

Comparison table

Item

Signal system

Area Continental

KV-V8E KV-V8J

PAL NTSC

Europe U.S.A.

Contents

q Specifications q CAUTION q Instructions

1. DISASSEMBLY

1.1 Disassembly flow chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 How to read the disassembly and assembly . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4 Service position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.5 Mechanism service mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.6 Emergency display function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1

1-1

1-1

1-4

1-4

1-5

2. MECHANISM ADJUSTMENT

2.1 Before starting repair and adjustment . . . . . . . . . . . . . . . . . . . . .

2.2 Replacement of major parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Installation of major parts (Mechanism phase alignment) . . . . .

2-1

2-4

2-9

2-11

2.5 Compatibility adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

E

J

Area Suffix

Continental Europe

North America

3. ELECTRICAL ADJUSTMENT

3.1 Precaution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2 Servo circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1

3-1

5. PARTS LIST

5.1 PACKING AND ACCESSORY ASSEMBLY <M1>

5.2 FINAL ASSEMBLY <M2>

. . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.3 MECHANISM ASSEMBLY <M4> . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.4 ELECTRICAL PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-1

5-2

5-4

5-6

COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.

No.49625

Feb. 2001

Specificatios (KV-V8J)

General

•Power supply

•Dimensions

•Mass

•Allowable working temperature

•Allowable relative humidity

•Allowable conservation temperature

Video

•Playback system

•Video signal

Audio

•Playback system

•Audio track

•Remote control unit

: DC12 V (11V-16V allowable)Negative ground

: 259 mm x 94 mm x 270 mm (10-1/4"x 3-3/4"x 10-11/16")

(width x height x depth)

: 3.2 kg (7.1 lbs)

: 0 °C to +40 °C (32 °F to104 °F)

: 35%to 80%

: -20 °C to +60 °C (-4 °F to 140 °F)

: VHS format,Hi-Fi 4-heads helical scan

: VHS NTSC standard

: VHS stereo Hi-Fi audio

: 2 Hi-Fi audio channels and 1 normal audio channel

: 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

•Dimensions

•Mass

•Allowable working temperature

•Allowable relative humidity

•Allowable conservation temperature

Video

•Playback system

•Video signal

Audio

•Playback system

•Audio track

•Remote control unit

: DC12 V (11V-16V allowable)Negative ground

: 259 mm x 94 mm x 270 mm

(width x height x depth)

: 3.2 kg

: 0 °C to +40 °C

: 35%to 80%

: -20 °C to +60 °C

: VHS format,Hi-Fi 4-heads helical scan

: VHS PAL standard

: VHS stereo Hi-Fi audio

: 2 Hi-Fi audio channels and 1 normal audio channel

: 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.

[1]

[2]

[3]

[4]

[5]

[6]

Top cover

Cassette housing assembly

Drum assembly

Mechanism assembly

Main board assembly

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.

SW board assembly, Front panel assembly

1.2 How to read the disassembly and assembly

<Example>

Step/

Loc No.

Part Name

[1] Top cover

Bracket

Fig.

No.

Point Note

D1 4(S1a),(S1b),3(L1a), <Note 1>

2(SD1a), (P1a),

CN1(WR1a),

2(S1c)

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

(5) Adjustment information for installation

1.3 Disassembly/assembly method

Step/

Loc No.

Part Name

[1] Top cover

Fig.

No.

Point

D1 2(S1a), (S1b), 2(S1c)

Note

[2] SW board assembly, D2 2(S2a), (WR2a), stay <Note 2a>

Front panel assembly

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

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

CN3006(WR2b)

[3] Cassette housing assembly

D3a, 2(S3a), 2(L3a)

D3b

<Note 3a>

[4] Drum assembly D4 CN1(WR4a),

CN1(WR4b),

(S4a), (S4b), (S4c)

<Note 2a>

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

CN3003(WR5b), <Note 5a>

CN3005(WR5c),

2(S5a), (S5b),

2(L5a)

[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.

<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

(S1c)

(S1b)

(S1c)

A

(S1a)

(L3a)

[3] Cassette housing assembly

Switch lever

(S3a)

(L3a)

(S3a)

A

Fig. D1

(S2a)

Stay

(S2a)

[2] SW board assembly

WR2a

G

WR2b

Foil side

<Note 2a>

(L2a)

[2] Front panel assembly

(L2b)

CN3006

(L2a)

Door opener

“a” <Note 2b>

Detail “G”

SW board

WR2a

WR2b

Chassis

Main board

CN3006

Front board

Fig. D2

1-2

REC safety switch

<Note 3a>

Fig. D3a

Rear side

Loading motor belt

Pinch plate

Hole align with hole in deck

<Note 3a>

Control cam

Fig. D3b

Note:

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

Not used

Inertia plate

(S4a)

(S4c)

(L5b)

CN1

WR4a

Supporting tape side

<Note 2a>

WR4b

Supporting tape side

<Note 2a>

Not used

Cleaner assembly

<Note 5>

(S4b)

[4]

Drum assembly

< d > (L5a)

CN1

Not used

WR4

[5] Mechanism assembly

Fig. D4

< e >

Not used

(S5a)

(S5b)

WR5a

CN1

WR5c

WR5b

Red line:

CN3003 pin1

[6] Main board assembly

Fig. D6

(S6b)

(S6a)

(L5a)

Spacer

<Note5a>

CN3005

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 disassembly 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 assemblies 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

TP4001

CTL.P

TP2253

A FM

TP111

D.FF

TP106

PB FM

SW board assembly

CN3006

Front board assembly

CN7001

CP5001

TP7001

MECHA TEST

TP7002

GND

CP5002

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 housing 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 Normal display

E: * * : * * EMG content display

(E:Latest:Previous)

*1: *2 : 34 EMG detail information <1>

*5: *6 : *7 EMG detail information <2>

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.

INITIAL MODE CUSTOM CODE

43: A CODE

53: B CODE

DATA CODE

Fig. 1-6a Jig RCU [PTU94023B]

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

Example 2 E : – – : – –

Latest EMG

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”.

(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> tail information <2>”.

, see “1.6.5 EMG de-

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

E01: Loading EMG

CONTENT

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.

E02: Unloading EMG 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.

E03: Take Up Reel

Pulse EMG

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.

CAUSE

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.

E04: Drum FG

EMG

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.

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 winding 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.

E05: Cassette Eject

EMG

E06: Capstan FG

EMG

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.

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.

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 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.

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.

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.

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 cassette 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.

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.

Table 1-6-3a

1-6

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 mode 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*]

8E

AC

AD

CC

CD

EC

ED

44

4C

6C

84

85

8C

8D

Display

MN*/M3* HD*

10

20

21

22

00

01

02

03

04

0C

24

2C

40

42

Deck operation mode

Mechanism being initialized

00 STOP with pinch roller pressure off (or tape present with P.OFF)

01 STOP with pinch roller pressure on

POWER OFF as a result of EMG

04 PLAY

0E REC

11 Cassette ejected

22 FF

-

-

Tape fully loaded, START sensor ON, short FF

Cassette identification FWD SEARCH before transition to FF (SP x7-speed)

26 FWD SEARCH (variable speed) including x2-speed

2E INSERT REC

43 REW

Cassette identification REV SEARCH before transition to REW (SP x7-speed)

47 REV SEARCH (variable speed)

4C AUDIO DUB

6E INSERT REC (VIDEO + AUDIO)

84 FWD STILL / SLOW

85 REV STILL / SLOW

8F REC PAUSE

Back spacing

Forward spacing (FWD transport mode with BEST function)

AF INSERT REC PAUSE

INSERT REC back spacing

CD AUDIO DUB PAUSE

AUDIO DUB back spacing

EF INSERT REC (VIDEO + AUDIO) PAUSE

INSERT REC (VIDEO + AUDIO) back spacing

* 2 : Mechanism operation mode

[Common table of MN* and M3*]

Display

Mechanism operation mode

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 executed

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

16 18 Mode transition to STOP with pinch roller compression ON as a result of POWER ON

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

2E 30 Mechanism position being corrected due to overrun

80 80 Mechanism in initial position (Dummy command)

[Table of HD*]

Display Mechanism operation mode

05

0E

11

22

00

01

02

04

STOP with pinch roller pressure off

STOP with pinch roller pressure on

U/L STOP (or tape being loaded)

PLAY

PLAY (x1-speed playback using JOG)

REC

Cassette ejected

FF

4C

6E

84

85

8F

26

2E

43

47

FWD SEARCH (variable speed) including x2-speed

INSERT REC

REW

REV SEARCH

AUDIO DUB

INSERT REC (VIDEO + AUDIO)

FWD STILL/SLOW

REV STILL/SLOW

REC PAUSE

AF

C7

INSERT REC PAUSE

REV SEARCH (x1-speed reverse playback using JOG)

CD AUDIO DUB PAUSE

EF INSERT REC (VIDEO + AUDIO) PAUSE

F0

F1

F2

F3

F4

Mechanism being initialized

POWER OFF as a result of EMG

Cassette being inserted

Cassette being ejected

Transition from STOP with pinch roller pressure on to STOP with pinch roller pressure off

Transition from STOP with pinch roller pressure on to PLAY

Transition from STOP with pinch roller pressure on to REC

F5

F6

F7

F8

F9

Cassette type detection SEARCH before FF/REW is being executed

Tape being unloaded

Transition from STOP with pinch roller pressure off to STOP with pinch roller pressure on

FA

FB

Transition from STOP with pinch roller pressure off to FF/REW

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 detection 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)

1-7

3– : Mechanism sensor information

[Common table of MN*, HD* and M3*]

Display MN* / HD*

S-VHS SW

4-

5-

6-

7-

8-

0-

1-

2-

3-

9-

A-

B-

C-

D-

E-

F-

M3*

Mechanism sensor information

CASS SW

REC safety

SW

VHS

VHS

VHS

VHS

Cassette insertion Tab broken

Cassette insertion Tab broken

Cassette insertion Tab broken

Cassette insertion Tab broken

VHS

VHS

Cassette insertion Tab present

Cassette insertion Tab present

VHS Cassette insertion Tab present

VHS Cassette insertion Tab present

S-VHS Cassette ejection Tab broken

S-VHS Cassette ejection Tab broken

S-VHS Cassette ejection Tab broken

S-VHS Cassette ejection Tab broken

S-VHS Cassette ejection Tab present

S-VHS Cassette ejection Tab present

S-VHS Cassette ejection Tab present

S-VHS Cassette ejection Tab present

Start sensor

ON

ON

OFF

OFF

ON

ON

OFF

OFF

ON

ON

OFF

OFF

ON

ON

OFF

OFF

–4 : Mechanism mode position

[Common table of MN*, HD* and M3*]

Display

MN* HD* M3*

Mechanism mode position

-0 -7

-1 -0

-

-2 -7

-

Initial value

EJECT position

-0 EJECT position (Cassette housing drive mode)

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

-5 -2 -5 Tape being loaded / unloaded (When the pole base is located on the rear side of the position just beside the drum)

-6 -7 -6 Pole base compressed position

-7 -3 -F FF / REW position

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

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

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

REV

-B -5

-

-

-D

REV (REV STILL / SLOW) position

REV position

-

-

-C Between REV and REV STILL / SLOW

-B REV STILL / SLOW position

-C -7

-

-

-A

Between REV and FWD

Between REV STILL / SLOW and FWD STILL / SLOW

-D -6

-

FWD (FWD STILL / SLOW) position

-9 FWD STILL / SLOW position

-E -7

-

-

-8

Between FWD and PLAY

Between FWD STILL / SLOW and PLAY

-F -6 -7 PLAY position

End sensor

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

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 the 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

93

C3

D3

E1

E2

E9

F1

00

16

82

84

92

Cassette tape type <1>

Cassette type not identified

Large reel/small reel (T-0 to T-15/T-130 to T-210) not classified

Small reel, thick tape (T-120) identified/thin tape (T-140) identified

Large reel (T-0 to T-60) identified

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

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

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

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

C cassette, thick tape (TC-10 to TC-20) identified

Small reel, thick tape (T-0 to T-100) identified

C cassette, thin tape (TC-30 to TC-40) identified

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

•

•

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

00 Cassette type not identified

07 Small reel, thick tape

08 - 0E C cassette, thick tape

09 - 15 C cassette, thick tape

0A - 0B Small reel, thick tape

0A - 16 C cassette, thin tape

0A - 16 C cassette, thin tape

0D - 0F Small reel, thick tape

11 - 14 Small reel, thick tape

15 - 18 Small reel, thick tape

17 - 1A Small reel, thick tape

19 - 1D Small reel, thick tape

1D - 21 Small reel, thick tape

1E - 1F Small reel, thin tape

1F - 23 Small reel, thick tape

21 - 23 Small reel, thin tape

21 - 23 Small reel, thin tape

22 - 24 Small reel, thick tape

22 - 24 Small reel, thin tape

22 - 24 Small reel, thin tape

22 - 23 Large reel

23 - 24 Large reel

25 - 26 Large reel

27 - 29 Large reel

29 - 2B Large reel

2D - 2F Large reel

Cassette tape type <2>

T-5

TC-10

TC-20P

T-20

TC-30

TC-40

T-40

T-60

T-80 / DF-160

T-90 / DF-180

T-100

T-120 / DF-240

T-140

T-130

T-160

T-168

DF-300

T-180 / DF-360

T-210 / DF-420

T-5

T-10

T-20

T-30

T-40

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

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. during 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 SEC-

TION 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)

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 disassembly 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 completes 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”.

Guide arm assembly

Pole base bssembly

Fig. 2-1-3a

2.1.4 Jigs and tools required for adjustment

Roller driver

PTU94002

A/C head positioning tool

PTU94010

Torque gauge

PUJ48075-2

Back tension cassette gauge

PUJ48076-2

Alignment tape

(EP, stairstep, NTSC)

MHP-L

Loading motor

Jig RCU

PTU94023B

Alignment tape

(SP, stairstep, PAL)

MHPE

Alignment tape

(SP, stairstep, NTSC)

MHP

Alignment tape

(LP, stairstep, PAL)

MHPE-L

2-1

2.1.5 Maintenance and inspection

1. Location of major mechanical parts

Drum Assembly

Stator Assembly

Guide Rail

FE Head

Tension Arm Assembly

Pole Base Assembly (SUP)

A/C Head

Capstan Motor Loading Motor

Belt (Loading Motor)

Pinch Roller Arm Assembly

Guide Arm Assembly

Lever Assembly

Control Plate

Tension Band Assembly

Control Cam

Change Lever Assembly

Slide Plate Reel Disk Assembly

(SUP)

Reel Disk Assembly (TU)

Pole Base Assembly (TU)

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

Belt (Capstan)

Rotary Encoder

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 completely 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

Operation Hours

~1000H ~2000H

Upper drum assembly

A/C head

Lower drum motor assembly

Pinch roller arm assembly

Full erase head

Tension arm assembly

Guide arm assembly

Capstan motor

Belt (Capstan)

Belt (Loading motor)

Loading motor

Reel disk (supply, take up)

Clutch unit (supply, take up)

Worm gear assembly

Control plate

Slide plate

Brush

Tension band assembly

Rotary encoder

¤

: Cleaning

R

: Inspection or replacement if necessary

Table 2-1-5a

2-3

2.2

Replacement of major parts

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.

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

A/C head

(B)

A/C head board

Pressure spring

Head base

Fig.2-2-4b

2. How to install

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

2-2-4c.

A/C head

Head base

5.7mm

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.2-2-4c

2.2.5

Pinch plate

1. How to remove

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

Claw

Pinch plate

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)

Head base

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

(A)

Fig.2-2-4a

2-4

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.

Red line

(to pin 1 of connector for the loading motor)

Label (Top view)

Loading motor

(B)

(B)

Sub deck assembly

(A)

(A)

Worm gear assembly

Belt

Fig.2-2-6a

2.2.7

Lever assembly, sub deck assembly, capstan motor

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

(2) Take out the slit washer, then remove the lever assembly.

(3) Take out the 3 screws (A), then remove the capstan motor and sub deck assembly together.

(4) Take out the 3 screws (B), then remove the capstan motor 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.

Back side

Belt

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)

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

Mechanism assembly

Fig.2-2-7a

(A)

(B)

Control bracket

Slit washer

Sub deck

Assembly

Lever assembly

Reel disk assembly (take up)

Fig.2-2-9a

Fig.2-2-7b

2-5

Reel disk assembly (take up)

Claw

Control cam

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 [

*

dicate the removal sequence.

] in-

Control plate Slit washer

Hook

Hook

[1]

Idler lever

(a)

Hook

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 mechanism 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.

< Back side of mechanism assembly >

Remove the claws in order of arrow.

Claw Claw

Claw

Belt

Slit washer

[4] Slit disk

(take up)

[2] Ider arm assembly

[3] Clutch unit

(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, remove the control cam.

Fig.2-2-12a

Change arm assembly

Main brake assembly

(take up)

Slide plate

Fig.2-2-12b

2-6

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 disengaging 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. 2-

2-13a, 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.

Rotary encoder

Position

Claw

Align the triangle marks

Claw

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 (supply) 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 assembly (supply).

(5) While pushing the claw in the disengaging direction, remove 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).

Tension arm assembly

Tension arm lever

Note

Tension arm assembly

Take up lever

Slit disk (supply)

Hook

Clutch unit (supply)

(b)

Slit washer

Hook

(c)

(c) (a)

Tension band assembly

Claw

Main brake assembly

(supply)

Reel disk assembly

(supply)

(a)

Claw

Sub brake assembly (supply)

Slit washer

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.

(A)

Pole base assembly

(A)

Claw

(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 assembly.

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.

Hole(a)

Screws (B)

Guide rail

Claw

Claw

Screw holes

Upper drum assembly

Rotor assembly

The hole is not in

line but is offset

toward the right.

Hole(b)

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-indicated 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)

Screw (B)

Lug wire

(Note)

Drum shaft Lug wire

Stator assembly

Screw (A)

Spring

Brush

Flat cable

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

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

Cap

Collar assembly

Loosen

1.5 mm hexagonal wrench

Washer

Upper drum assembly

Collar assembly

Fig. 2-2-19c

Press

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 assembly and lower drum assembly and carry out the following adjustments.

• PB switching point adjustment

• Slow tracking adjustment

• Compatibility adjustment (Be sure to check for compatibility for the EP (or LP) mode.)

Lower drum assembly

Collar assembly

Fig. 2-2-19d

Tighten

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

Shaft

Lower drum assembly

Upper drum assembly

Fig. 2-2-19b

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.

Loading arm assembly (supply)

To pole base assembly

To pole base assembly

Correct direction

Loading arm assembly

(take up)

Holes align with hole in deck

Holes align with hole in deck

Position

Claw

Align the triangle marks

Rotary encoder

Claw

Holes align with hole in deck

Change lever assembly

Fig. 2-3-3a

Capstan brake assembly

Holes align with hole in deck

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 alignment 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

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.

Main brake assembly (supply)

Main brake assembly (take up)

Set main brake assemblies to brake off position

Holes align with hole in deck Slide plate

Fig. 2-3-4a

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

TENSION ARM ASSY

TENSION ARM

(SPRING)

SUP

IDLER

TU

CENTER

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

PARTS

SLIDE PLATE

CONTROL CAM

L S A

0

0 mm 4 mm

0 °

30.6

°

L A B

L S C

ROTARY

ENCODER

A

B

C

POLE BASE ASSY

PINCH ROLLER CAM

(UP/DOWN)

PINCH ROLLER

(CAPSTAN)

MECHANISM

MODE

ASSEMBLY EJECT

LOADING

Holes align with holes in deck

Control braket

Control plate

W-FWD FWD S.FWD

W

21 mm

160.4

°

F

24 mm 26 mm

183.3

°

198.6

°

Hole of take up lever align with hole in deck

Fig. 2-3-5a

Slit washer (red)

S.REV

REV

R

32 mm 34 mm

244.5

°

259.7

°

STOP

S

37.5 mm

286.5

°

FF/REW

FF

43 mm

328.5

°

NOT USED

PLAY

REC

REC. P

STOP

F. FF

SLOW (FWD)

STILL (FWD)

SLOW (REV)

STILL (REV)

S. REW

BACK

SPACE

STOP

MECHA

SERVICE

Table 2-4a

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

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.

CUSTOM CODE

43: A CODE

53: B CODE

DATA CODE

Fig. 2-5a Jig RCU [PTU94023B]

INITIAL MODE

2.5.1 FM waveform linearity

Signal

Mode

Equipment

(A1)

(A2)

(A1)

(A2)

(B)

(C)

Measuring point (D)

External trigger (E)

Adjustment part (F)

Specified value (G)

Adjustment tool (H)

[KV-V8E]

•

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]

• PB

• Oscilloscope

•

TP106 (PB FM)

• TP111 (D.FF)

• Guide roller [Mechanism assembly]

• Flat V.PB FM waveform

• Hexagonal wrench (1.25 mm)

• 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. Perform 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 operation. 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.)

2-12

(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. 2-5-

1d.)

(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).

Max level Min level

Proper waveform variation

Improper waveform variation

Fig. 2-5-1a

Roller driver

Hexagonal wrench

Loosen

Tighten

1.25mm

Fig. 2-5-1b

Guide roller

A B

Level drop at the guide roller (supply side)

C D

(4) Adjust the AUDIO OUT waveform and Control pulse 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.

(2)

Guide pole (T.U)

(1)

(3)

Guide pole (T.U) bottom flange

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

• Proper waveform variation: Always flat

Audio out

CTL.P

• Improper waveform variation:

Higher

Fig. 2-5-1c

Improper

Lower

( a ) Guide roller

Proper

( b ) Guide pole

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

Mode

Equipment

(A)

(A)

(B)

(C)

Measuring point (D1)

(D2)

External trigger (E)

Adjustment part (F)

Specified value (G)

[KV-V8E]

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

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

[KV-V8J]

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

• PB

•

Oscilloscope

• AUDIO OUT terminal

• TP4001 (CTL. P)

• TP111 (D.FF)

• A/C head [Mechanism assembly]

• Maximum waveform

(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.

Fig. 2-5-2a

2.5.3

A/C head phase (X-value)

Signal (A)

Mode

(A)

(B)

Equipment (C)

Measuring point (D)

External trigger (E)

Adjustment part (F)

Specified value (G)

Adjustment tool (H)

[KV-V8E]

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

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

[KV-V8J]

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

• PB

• Oscilloscope

• TP106 (PB FM)

• TP111 (D.FF)

• A/C head base [Mechanism assembly]

•

Maximum V.PB FM waveform

• A/C head positioning tool [PTU94010]

(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 capstan. Then turn it back gradually toward the drum and stop on the first peak point position of the V.PB FM waveform 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.

(5)

A/C head positioning tool

A/C head

(5)

To the capstan

(4)

(4)

To the drum

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 completed.

(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)

Mode (B)

Adjustment part (F)

Specified value (G)

• Back tension cassette gauge

[PUJ48076-2]

• PB

• Adjust pin [Mechansim assembly]

• 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.)

2.5 pole

Adjust pin

Drum side

X-value adjustment point

Control head position Capstan side

Maximum

Fig. 2-5-3b

2.5.4

Standard tracking preset

Signal (A)

Mode

Equipment

(A)

(B)

(C)

Measuring point (D)

External trigger (E)

Adjustment part (F)

Specified value (G)

Adjustment tool (H)

[KV-V8E]

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

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

[KV-V8J]

•

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

• PB ¥ Auto adjust

• Oscilloscope

• TP106 (PB FM)

• TP111 (D.FF)

• Jig RCU: Code “50”

• STOP mode

(Maximum V.PB FM waveform)

• Jig RCU [PTU94023B]

Tension arm assembly

Fig. 2-5-5a

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, NTSC)

MHP

Alignment tape

(EP, stairstep, NTSC)

MHP-L

Alignment tape

(SP, stairstep, PAL)

MHPE

Alignment tape

(LP, stairstep, PAL)

MHPE-L

Alignment tape

(SP, color (colour) bar, NTSC)

MH-1

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

• 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

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

[KV-V8E]

(A2) • Alignment tape (SP, stairstep, PAL) [MHPE]

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

[KV-V8J]

(A2) • Alignment tape (SP, stairstep, NTSC) [MHP]

Mode

Equipment

(B)

(C)

• PB

• Oscilloscope

Measuring point (D1) • VIDEO OUT terminal (75Ø terminated)

(D2) • TP106 (PB FM)

External trigger (E) • TP111 (D.FF)

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

[KV-V8E]

Specified value (G) • 6.5 ± 0.5 H (SP, stairstep, PAL) [MHPE]

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

[KV-V8J]

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

Adjustment tool (H) • Jig RCU [PTU94023B]

(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

V.sync

Switching point

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.

INITIAL MODE CUSTOM CODE

43: A CODE

53: B CODE

DATA CODE

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

Fig. 3-2-1a Switching point

V. rate

3-1

3.2.2 Slow tracking preset

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

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

[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]

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]

(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)