SANYO V-95 User Manual

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Page 1

BASIC SERVICE TECHNICAL

piw

INFORMATION

FILENO.

Siiio

Video Cassette Recorder

V95 IMECHANISM

PALSECAM NTSC

Contents

1. MAINTAINING AND CHECKING

THE MECHANISM

1-1. REGULARCHECKSAND

MAINTENANCE ITEMS ...................2

1-2. SERVICETOOLS ..............................3

2. AN OVERVIEW OF THE MECHANISM

2-1. NAMES OF THE MAIN PARTS .......4

2-2. AN OVERVIEW OF THE

MECHANISM MODES .....................6

3. DIS-ASSEMBLING THE MAIN PARTS OF THE MECHANISM

3-1. HOW TO MAKE THE MECHANISM

MOVE ...............................................8

3-2. MECHANISM UNIT .........................9

3-3. CASSETTEDRIVEMECHANISM ....9

3-4. CLEANERROLLER

ASSEMBLY .................................... 11

3-5. CYLINDER(DRUM) ........................12

3-6. FEHEAD AND ACE HEAD.............I4

3-7. CAPSTAN MOTOR ........................15

3-8. LOADING MOTOR ASSEMBLY

AND WORM GEARASSEMBLY ...16

3-9. PINCH ROLLERPRESSURE

MECHANISM .................................16

3-10. L GUIDE LEVERASSEMBLY AND

LOAD LEVERASSEMBLY .............18

3-11. BT LEVERASSEMBLY ..................18

3-12. REELDRIVEMECHANISM ............19

3-13. BRAKES .........................................20

3-14. GUIDES ..........................................22

3-15. WHEEL GEAR2, MAIN CAM AND

MODE SWITCH ..............................23

3-16. CRESCENTSLIDE ..........................24

3-17. S LOAD GEAR,T LOAD GEAR,

S LOAD LEVERASSEMBLY AND

T LOAD LEVERASSEMBLY ..........25

3-18. TAPE SENSORS, REELSENSOR

AND EPSW LEVER .......................26

4. MECHANISM CHECKS AND ADJUSTMENTS

4-1. REELTABLETORQUE CHECK......27

4-2. ADJUSTING THE BT LEVER

ASSEMBLY POSITION AND CHECKINGTHE BACKTENSION

TORQUE IN PLAYMODE ..............27

4-3. TAPE PATH ADJUSTMENT ..........28

VMECHANISM

REFERENCE No. MM531433

Page 2

1. MAINTAINING AND CHECKING THE MECHANISM 1-1.

REGULAR CHECKS AND MAINTENANCE ITEMS

To obtain full function and maximum performance from the set, and to stop it getting dirty or scratched, we

recommend that you carry out the following maintenance procedures and regular checks. The maintenance checks described in the following section should also be carried out without fail after carrying out any repairs to the set. to a depth of Icm and then taken out.

NOTE: OIL AND GREASE

● Always use the specified brands of oil and grease. if you

use a grease with the wrong viscosity, for example, this can lead to all sorts of problems. Be careful to keep the oil and grease free of dust and foreign bodies.

● A “drop” of oil is the amount of oil remaining on the tip

of a rod with a diameter of 1.5mm after it is dipped in oil

1-1-1. REGULAR CHECKS

Hours of use (H)

Part maintained

Tape guide ACE head, full erase head

Tape path system environment in which the part

Drive Reel belt system

Performance

checks

Cylinder (drum)

Cleaner roller assembly

Pinch roller Reel table

Relay gear, Pulley shaft, Gaar shaft

Loading motor

Back tension o Q o 0 Brake system

FWD, REW, PLAY torque, REV torque

500 1000 1500 2000 2500 3000 3500 4000 4500 5000

o 0 0’ 0 0 0 0 0 0 0 o 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 enormously, depending on the

(0) (0) (0) (0) (0) (0) (0) (0) (0) is used.

0 0

o 0 0 0 0 0 0 0 0 0

A A

0 0

o Q

A A A

0 0 0

o 0

OClean

The life of parts varies

~Check

Remarks

Pleyback tension torque:

~ 30 to 50g/cm

FWD: 600g/cm or over REW: 600g/cm or over PLAY (SP mode):

~ 80 to 140g/cm

REV: 120 to 220g/cm

AOi

1-1-2. CLEANING

1. Cylinder (Drum) (See Fig.1-l-1)

Moisten a chamois with methyl alcohol and clean the video

head (including the Hi-Fi audio head) and the tape path

surface of the cylinder. Be sure to wipe horizontally in

relation to the video head. If you wipe vertically, or use

excessive force, you can damage the video head.

2. Tape Path System / Reel Drive System

Clean the pinch roller, the capstan shaft, the tape guides,

the FE head, the ACE head, the reel table, the pulley and the

reel belt with a soft cloth, or chamois, moistened with methyl alcohol.

-2-

Tape path’ surface

.—

Video head

Fig.1-1-1 -

Page 3

1-2. SERVICE TOOLS

1-2-1. SERVICE TOOLS NOTES ON ALIGNMENT TAPES

Select a PAL or NTSC alignment tape from the list below, repairing. PAL: For models with 625 scanning lines and a field frequency of 50Hz NTSC: For models with 525 scanning lines and a field frequency of 60Hz

according

to the transmission

system Ot the VCH you are

. . . ---

No.

1 Alignment tape 2 Aiianment taDe VHJ-0006 3 I Alignment tape 4 Alignment tape

Eccentric screw driver

Nut box

Torque dial gauge

7 8 Cassette torque meter VHJ-0016

Load lever assembly height adjustment tool

10 Torque gauge screwdriver VHJ-0014

3 mm dia. bit for torque screwdriver VHJ-0045 Used to replace the bit of the torque

I 12 Video head removing tool 13 Oil VHJ-0099

Grease VHJ-0100

Grease VHJ-0101

16 Relay cables

Tool Tool No. Remarks

NTSC

VHJ-0005

VHJ-0007 I — I EP monoscope

VHJ-0003 VHJ-0048

VHJ-OO04

VHJ-0102

VHJ-0041

VHJ-0106 Relay cables of mechanism and CP-1

PAL VHJ-0008 SP colour bar lkHz (normal) VHJ-0009 SP monoscoDe 7kHz (normal)

VHJ-0052

LP monoscope Used to adjust the tape path Used to adjust the height of the lever

load assembly Used tomeasurereel winding torque Used to measure backtensiontorque Used to adjust the height of the load

lever assembly Used to adjust the tightening torque of

screws

gauge screwdriver

Used to remove the upper cylinder

PWB assembly

VHJ-0005,VHJOO06,VHJOO07 VHJ-0003 VHJ-0048 VHJ-0004

No.1,2,3,4

VHJ-0016

VHJ-0041 VHJ-0099 VHJ-0100, VHJ-0101 VHJ-O1O6

No. 12 No, 13

No.5

VHJ-0102 VHJ-0014 VHJ-0045

~ N

!!!

410

No. 6

‘lNo.

l!!!!!

No. 14,15

No. 7

No. 16

Fig.1-2-l

–3-

Page 4

1-2-2. Using the Relay Cable (VHJ-0106) The mechanism can be repaired without using the relay cable (VHJ-0106). As shown in Fig. 1-2-2, the relay cable

(VHJ-O1O6) is a tool used for relay between the CP-I PWB

assembly and mechanism unit. When connecting it, take note of the pin number of the connector.

NOTE 1: Do not place the mechanism upright as shown in

Fig. 1-2-2 when inserting/ejecting the cassette.

NOTE 2: For NTSC models, be sure to connect the VM-I

PWB assembly and CP-I PWB assembly.

2. AN OVERVIEW OF THE MECHANISM

2-1. NAMES OF THE MAIN PARTS

2-1-1. CASSEITE MECHANISM ASSEMBLY

CP-I PWB assembly

Mechanism unit

Fig. 1-2-2

e lever

pring

Under fl

nion gear

—-

Gear holder

Drive gear

Fig. 2-1-1 —

–4–

Page 5

2-1-2. TOPVIEW

T in

S incl

Claaner roller aaaembly

Cylinder (Drum)

/ /Sbr;ke I

EP aw lever

T brake asaembly

/ aaaembly

Cleaner lever

.— ,.— ,

S reel gear

Capstan brake assembly

Audio R/P head aasembly

(ACEhead)

\ Tbrake act slide ‘Treel gear

Clutch mounting assembly

. .

embly

Fig. 2-1-2

2-1-3. UNDERSIDE

Harneaa mounting

Pinch cam gear

Mode switch (S8001 )

Brake control lever ~~~~)

Clutch chanrae Ievar

Cylinder earth

Reel belt

Capatan

motor

aaaembly

Al 1

II@ \YY

Main cam >

N AA (

c-c_enta,ide----!b4lLXil73

Whael gear 2 Wheel gear 1

Worm gear assembly

/Brake ac’t lever I i \ \

/ aeaembly

Loading motor assembly

Reel pulley

, Stator

= Rotor

/ T load gear

z S load gear > Crescent mounting , T load lever eeaembly

-- S load lever aasembly

, BT spring lever assembly

— MC-1 PWB aaaambly

S brake act slide

Friction gear aasembly

Fig. 2-1-3

-5-

Page 6

2-2. AN OVERVIEW OF THE MECHANISM MODES

2-2-1. MECHANISM MODE SWITCHING TABLE

NOTE: The letters and figures enclosed in circles in the mechanism mode column are the codes on the crescent slide.

MODE SWITCH OUTPUT TABLE

HEX DATA

SW DATA 1 x ‘f z

5.OV H H H 5V

1 5.OV H H L Ov

2.5V H L H 5V

2.5V H L L Ov

3 4 3.4V L H H 5V 5 3.4V L H L Ov 6 2.OV L L H 5V 7 2.OV L L L Ov

SW DATA2

APPEARANCE OF MODE SWITCH AND RELATIONSHIP BETWEEN MODE POSITIONS

FF/REvv ~ ~ EJECT

STIL

CZXY

-6-

Fig.z-z-l -

Page 7

(S): Strength (W): Weakness

Mechanism mode

Principal parts

T brake assembly

S brake assembly

T soft brake assembly

S soft lever BT lever assembly BT spring Pinch roller lever assembly

Clutch mounting assembly PLAY PLAY PLAY PLAY PLAY PLAY PLAY PLAY PLAY PLAY FF

Load lever assembly Capstan brake assembly S and T incline mounting assembly Cleaner roller assembly

2-2-3. HOW TO CHECK THE MECHANISM MODE

POSITION

You can tell which mode the mechanism is currently in by

looking at the codes and marking-lines on the crescent slide ontheunderside of the mechanism chassis. The edae of the crescent mounting is used as the reference line, as

shown in Fig.2-2-2, and the marking-lines and symbols

indicating the mechanism modes are displayed on the crescent slide, which slides against the edge of the crescent mounting. The mechanism mode is read off from the marking-line on the slide crescent which is aligned with the reference-line on the crescent mounting.

Example: In Fig.2-2-2, marking-line 6 is aligned with the

reference-l ineonthecrescent mounting, sothe mechanism

is seen to be in FF/REW mode.

2-2-4. SELF-DIAGNOSIS DISPLAY

Some models are equipped with the SELF-DIAGNOSIS DISPLAYS function.

Useitas ameansoffinding outthesymptoms andcauseof the error before performing repairs. For details, refer to the separate service manual for the respective models.

; 7 ~

OFF OFF ON ON ON OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF ON ON ON ON ON OFF OFF OFF OFF

ON ON ON ON ON OFF OFF OFF OFF OFF OFF OFF OFF ON OFF OFF OFF OFF OFF ON(W) ON(W) ON(S) ON(S) ON(S) ON(W)

UP UP

UNLO UNLO LO LO LO LO LO LO LO LO LO

OFF OFF OFF OFF OFF OFF OFF ON

OFF OFF OFF (ON) (ON) OFF OFF OFF

$ K

~fi g3 o

g’

: J

- “ _

up ;;tWN

LO UNLO

The edge of the crescent mounting is the reference-line.

~ R cc

DOWNI ON

ON ON ON ON ON

OFF ON ON OFF OFF

q p w ~

: $ : :

i= (n

OFF ON ONIOFF OFF ON ONIOFF

OFF OFF OFF

Crescentlmounting

-1 L

)

–7–

Fig.2-2-2

Page 8

3. DISASSEMBLING THE MAIN PARTS OF THE MECHANISM

POINTS TO NOTE

●

When fitting the parts of the mechanism, refer to the “Assembly Notes”, assembly order.

●

Dis-assembly and assembly should be carried out in EJECT mode unless a movement mode is explicitly specified. EJECT mode is the state in which the cassette tape has been ejected.

●

Clamps are used to prevent parts coming loose. When removing a clamp, be careful not to force it, as this can result in damage.

3-1. HOW TO MAKE THE MECHANISM

MOVE

In order to check a movement such as front loading, front unloading, tape loading, tape unloading, raising/lowering and pressing the pinch roller, you will need to operate the loading motor. There are two methods of operating the loading motor, and these are explained in sections 3-1-1 and 3-1-2. The above movements can also be performed

without operating the loading motor, by following the

method explained in section 3-1-3.

3-1-1. HOW TO OPERATE THE LOADING MOTOR

USING A DC VOLTAGE SUPPLY (See Fig.3-l-1)

1) Remove the power plug from the socket.

2) Remove ~he top cover, front cabinet assembly and bottom cover.

3) Supply a DC voltage in the range 5V between the MOTOR (+) wire and the MOTOR (-) wire on the CP-I PWB assembly. To make the loading motor rotate in

the PLAY or FF/REW direction, the positive terminal should be connected to the MOTOR (+) wire, and the negative terminal to the MOTOR (–) wire. To make it

rotate in the EJECT direction, connect the positive

terminal to the MOTOR (-) wire, and the negative terminal to the MOTOR (+) wire. When rotating the loading motor inthe EJECT direction with a tape slacken, stop the rotation of the loading motor before beginning front unloading. Rotate the capstan motor with your hand, wind the slacked part of the tape, and rotate the loading motor

in the EJECT direction again. NOTE 1: When carrying out front loading, release the lock by pressing down the tray lock lever@ and the lid opener lever @ of the cassette mechanism assembly (shown in

Fig.3-2-2) in the direction of the arrow. NOTE 2: When the loading motor stops rotating, following

the completion of an operation such as tape loading or front unloading, switch off the DC voltage supply.

and proceed in the reverse of dis-

Bottom side

Motor (+) wire

Motor (-) wire

3-1-2. OPERATING THE LOADING MOTOR BY THE

MANUAL METHOD (See Fig.3-l-2)

1) Refer to section 3-2 and install the mechanism unit.

2) Using your finger, turn the loading motor located at the rear of the mechanism unit. For EJECT, turn the loading motor in the direction of the arrow on the loading motor. For PLAY or FF/REW, turn it in the opposite direction. When rotating the loading motor in the EJECT direction with a tape slacken, stop the rotation of the loading motor before beginning front unloading. Rotate the capstan motor with your hand, wind the slacked part of the tape, and rotate the loading motor _ in the EJECT direction again. When carrying out front loading, release the lock by pressing down the tray lock lever @ and the lid opener lever @ of the cassette mechanism assembly (shown in Fig.3-2-2).

The arrow which showtha direction of EJECT

Front side

Fig.3-l-l

Fig.3-l-2

Loading motor

3-1-3. MAKING THE MECHANISM MOVE USING

THE MANUAL METHOD

1) Refer to section 3-2 and remove the mechanism unit.

2) Refer to section 3-15 and remove the gear wheel 2.

3) If you turn the main cam anticlockwise, the mechanism

will switch to a mode such as PLAY or FF/REW. To switch from FF/REW mode to EJECT mode, turn the

main cam clockwise.

–8–

Page 9

3-2. MECHANISM UNIT

(See Figs. 3-2-1 and 3-2-2)

Remove the top cover, bottom cover and front cabinet

assembly.

—

Unplug the flat cable@l from the VM-1/VP-l PWB assembly on the cylinder (drum), and unplug the ACE head connector@.

Remove the screw @, the two screws@, then remove the VM-1/VP-l PWB assembly@, lifting it upwards. The shape of the VM-1/VP-l PWB assembly and the bracket varies according to the model.

Remove the four screws@ and the two screws@, then lift up the mechanism unit. The tray@ will stop you removing the two screws @ on the front, so release the Iockbypressing down the tray lock lever @ and the lid opener lever @ shown in Fig.3-2-2, then slide off the tray~. section 3-1 and turn the loading motor in the PLAY direction.

@Screw

IFI ““Iat cable

Move the tray by referring to

Bracket

I A ~e@Screw

3-3. CASSEITE DRIVE MECHANISM

3-3-1. CASSEITE MECHANISM ASSEMBLY

(See Figs.3-3-l and 3-3-2)

1) Put the VCR into EJECT mode.

2) Remove the two screws @).

3) Lift up the back of the cassette mechanism assembly @ slightly, and remove the two hooks@ on the front.

ASSEMBLY NOTES:

The cassette mechanism assembly and the mechanism chassis should both be fitted in EJECT mode.

Check that the two hooks @ have snapped into the

mechanism chassis, and make sure that the two holes @in the cassette mechanism assembly are aligned with the two dowels @ on the mechanism chassis.

Make sure that the big tooth on the pinion gear of

the cassette mechanism assembly slots properly into the deepest gap in the start rack gear, as shown in

Fig.3-3-2.

When fitting the two screws@, use the torque gauge screwdriver (VHJ-0014). Give the screws a tightening torque of 5 kg/cm.

~ @Screws

A“

‘k

.“Yi

..-’

.. ,

@Screw

VM-I(VP-1) PWB assembly

Mechanism chassis

f@Hole

Fig.3-3-l

Fig.3-2-l

sure correct erlocking

Lock gear

Fig.3-2-2

–9–

Start rack gear

Fig.3-3-2

Page 10

3-3-2. CASSEITE DRIVE GEAR (See Fig.3-3-3)

1) Refer to section 3-3-1 and remove the cassette mechanism assembly.

2) Remove clampso and @, then remove the gear holder @.

3) Remove the clampo, then remove the pinion gear@.

4) Remove the clamp@, then remove the lock gear@.

ASSEMBLY NOTES:

1. Put the tray in the EJECT mode position before fitting any parts.

2. Apply grease (VHJ-0100) to the gear mounting shafts, allthe gear teeth, and the cam part of the drive gear@.

3. Ensure that the drive gear, the lock gear and the pinion gear interlock correctly, as shown in Fig.3-3-2.

4. Make sure the clamps@) and @ snap in to the gear holder @.

$)$@

“ I , %J~epiniongear

- Q._R of the teeth) .

(grease the outer rim

3-3-3. DOOR OPENER, UNDER FRAME AND

STAND L (See Fig.3-3-4)

Remove the cassette mechanism assembly, referring —

to section 3-1. Remove the two clamps @ and take out the under _

2) frame @, pulling it towards you. Press down the tray lock lever @ and the lid opener

3) lever@, and loosen the tray@, lifting it away from you. In this state, press the clampo and remove the door opener Iever@.

Remove the two clamps@ and take out the stand L@. Be careful not to exert too much force on the clamps

@, as this could cause damage.

ASSEMBLY NOTES:

1. Apply grease (VHJ-0100) to the grooves @ on the

stand L, the inside of the hole@ in the drive shaft@, and the mounting hole@ in the door opener lever of the stand R.

2. Before fitting the stand L o, be sure to move the

tray@ back as far as the EJECT mode position. Put the two pins @l on the tray@ into the grooves@ on the stand L. Put the drive shaft@ into the hole@.

3. Be sure to fasten the two clamps@ and the clamp@

on the stand R, and to fasten the two clamps @ on the stand L.

@.tand L

@Gear holder

Fig.3-3-3

@Hole

@ !-

Pinsl

@ amps

@Clamp

Fig.3-3-4

–lo–

Page 11

3-3-4. START RACK GEAR AND FRONT RACK GEAR

‘Mounting

(SeeFigs.3-3-5 and 3-3-61

Remove the mechanism unit, referring to section 3-2.

Remove the cassette mechanism assembly, referring

to section 3-3-1.

Remove the special screw o. When you do this, slide

3) the front rack gear assembly@ towards the front until

it stops, then take it off the shafto. Take care not to damage the shaft@.

Remove the spring @. Remove the clamp@ on the front rack gear@, then

remove the start rack gear @.

ASSEMBLY NOTES:

Apply grease (VHJ-0100) to the front rack gear@ and

all over the inside of the groove on the start rack gearo.

Align the positioning mark@ on the front rack gear@ with the mark @ on the main cam ~.

When installing the cassette mechanism assembly,

refer to section 3-3-1 and align the start rack gear with

the pinion gear.

@Clamp

/ .....’”--’’”-””

,..,

,,,

.,-

...

...”

.....

...

‘%..

....>

/ -,+x, ‘-;’:..

,.., .- ‘-

,,~

,.-,-

~fl&/ ,...”’-” @Spring

...

.... ,., ”

..-”

... .,. -’

.,.

@Start “rack gear

~apply grease to mslde of groove)

@Front rack gear

!ap.ply grease to

y @ Ins;de of groove)

; Shaft

.,..,.

>.,”

/ .-

,.,

@Front rack

““’~.(

‘y ,. -%..

,..-

““””‘“2 ,...””’;;

$@’”

‘ 1

,..

gear assembly

‘Y

@Special screw

3-4. CLEANER ROLLER ASSEMBLY

(See Fig.3-4-1)

1) Remove the clamp@ and take out the cleaner lever@.

When you do this, be careful not to bend the p!astic springs @ and @on the cleaner lever@.

2) Remove the clamp o, and take out the cleaner roller assembly@. Becarefui nottotouch the sponge on the cleaner roller assembly@.

ASSEMBLY NOTES:

1. When mounting the cleaner lever@ on the shaft@, press the clamp@ in the direction shown by the arrow, and snap it into the mounting @ on the audio RIP head assembly.

- 4 Cleaner roller assembly

- @Clamp

- @Cleaner lever

~@ Clamp

@Plastic spring -

*7i?\

_ @Plastic spring

Shaft

Fig.3-4-l

@Positioning mark

@lMain cam

Flg.3-3-5

@Positio~ing mark

Fig.3-3-6

–11–

.,,

Page 12

3-5. CYLINDER (DRUM)

eA@ROundhO’

3-5-1. UPPER CYLINDER ASSEMBLY

(UPPER DRUM) (See Figs. 3-5-1,3-5-2,3-5-3,

3-5-4) There are two types of cylinders, one that can be disassembled into the upper cylinder (upper drum) and lower cylinder (lower drum) and one that cannot. For that typethatcannot, replace thecylinder assembly asawhole.

Remove the two screws @ (See Fig.3-5-1).

First, tighten the handle@ of the video head removing tool (VHJ-0041), then screw the two long screws @ evenly into the two screw holes @ in the upper cylinder assembly (upper drum) @) (See Fig. 3-5-2). Hold the tool (VHJ-0041) so that the upper cylinder

3) assembly (upper drum) @ does not rotate, and at the same time, turn the handle@ clockwise, and remove

the upper cylinder assembly (upper drum)@.

Remove the tool (VHJ-0041) from the upper cylinder assembly @.

@Screws

ASSEMBLY NOTES:

1. When carrying out assembly, the CH-I head on the upper cylinder assembly (upper drum)@ and the lower cylinder assembly (lower drum) @ must be aligned. The CH-1 head on the upper cylinder assembly@ bears _ a code@ such as 2N2S-V, 2N4N, or 4H6N, as shown in Fig.3-5-3. The CH-I on the lower cylinder assembly@ has a round hole o, as shown in Fig.3-5-4. Assemble the parts so that the round hole @l is next to the code @on the upper cylinder assembly.

2. Be careful not to scratch the tape path surface of the cylinder. After replacing the cylinder, clean the tape path surface of the cylinder.

3. After replacing the upper cylinder assembly, dothetape path adjustment as instructed in section 4-3 and do the switching position adjustment of the servo circuit.

@Upper cylinder assembly

(upper drum)

.---------------

@Handle

Screw holes

& ~ ‘vHJ-004’)

1 I

‘~

‘@’

*DJ]

Fig.3-5-l

!- Video head removing tool

@ Upper cylinder assembly

(upper drum)

@ Lower cylinder assembly

(lower drum)

[EXCEPTFOR2-HEADMONAURALMODELS]

[2-HEAD MONAURAL MODELS ONLYI

@ Round

0’

W/ ‘ Screw holes

@Lower cylinder

- assembly

Fig.3-5-3 _

(lower drum)

Lower cylinder assembly (lower drum)

Fig.3-5-2

–12-

Fig.3-5-4

Page 13

3-5-2. CYLINDER (DRUM) UNIT (See Fig.3-5-5)

1) Put the mechanism into EJECT mode.

2) Refer to section 3-2 and remove the VM-1/VP-l PWB assembly

3) Refer to section 3-4 and remove the cleaner lever.

4) Remove the two screwso and take off the bracket @. The bracket shape varies according to the model.

5) Remove the three screws@. Taking care not to scratch or soil the tape path surface of the cylinder (drum), lift the mounting cylinder@ slightly, and

keeping it raised.

ASSEMBLY NOTES:

Apply grease (VHJ-0100) to the rails (front and rear) of

the cylinder mounting@ (grease the parts which come

in contact with the S and Tincline mounting assembly).

Align the two dowels@ on the mounting cylinder

@ with the two holeso on the mechanism chassis.

Check that connector is inserted in the CP-I PWB assembly. After assembly, clean the tape path surface of the

cylinder (drum).

After replacing the cylinder unit, do the tape path adjustment as instructed in section 4-3, and do the switching position adjustment of the servo circuit.

@lScrew

./ \ @Bracket (shaDe varies

e5\-

“model)

3-5-3. CYLINDER MOTOR (ROTOR AND STATOR)

(See Fig.3-5-6)

1) Refer to section 3-5-2 and remove the cylinder unit.

2) If you have removed the mechanism unit, remove the screw @ and remove the cylinder earth assembly@.

3) Remove the two screws@, the rotor@ and the spacer @.

4) Remove the three screws@ and the stator @.

ASSEMBLY NOTES:

When fitting the rotor@, align the long hole~ -beside

the triangular mark on the rotor@ - with the hole @ in the rotor disk.

When fitting the screws@ and @, use the torque gauge screwdriver (VHJ-0014). give the screws tightening torque of 3 kglcm. Align the dowel (@ on the cylinder earth assembly@

3. with the hole @ in the chassis. if you have removed the cylinder unit, after assembly,

4. do the tape path adjustment as instructed in section 4-3, and do the switching position adjustment of the servo circuit.

@Screws

@Rot~

@lLong hole (used for

alignment when fitting the rotor)

‘>

Triangularmark

*YV J

I I_= mounting

@Cyiinder

Fig.3-5-5

Wspacer ~!

~Ho,e6s:=// ‘@Ho’e

when fitting the rotor)

–13-

~@Dow$

@Screws

to r

@Cylinder

earth assembly

Fig.3-5-6

Page 14

3-5-4. CYLINDER ASSEMBLY (See Fig.3-5-7)

1) Refer to sections 3-5-2 and 3-5-3, and remove the cylinder unit, the rotor, and the stator.

2) Remove the three screws@ and the cylinder assembly @.

ASSEMBLY NOTES:

1. Be careful not to scratch or soil the top of the cylinder. After fitting the cylinder, clean the surface.

2. Align the cylinder assembly@ with the two dowels@ on the cylinder mounting @.

3. After fitting the cylinder assembly, do the tape path adjustment as instructed in section 4-3 and do the switching position adjustment of the servo circuit.

,------------------------------------------ ,

R/P head assembly

cad)

@Hole

m“

IGI

,-----------......-------------.........

@Dowels

@cy

3-6. FE HEAD AND ACE HEAD

u \

~—

@Cylinder

assembly

rews

Fig.3-5-7

Fig.3-6-l

3-6-2. FULL ERASE HEAD (See Fig.3-6-2)

1) Unplug the connector from the full erase heado.

2) Remove the screw@ and the full erase heado.

ASSEMBLY NOTE:

1. After assembly, clean the full erase head~.

@Screw

@Full erase head

3-6-1. AUDIO R/P HEAD ASSEMBLY (ACE HEAD)

(See Fig.3-6-1)

1) Unplug the connector from the audio R/P head assembly (ACE head).

2) Remove the two screws@ and the audio RIP head assembly (ACE head) @.

ASSEMBLY NOTES:

Align the holeo on the audio R/P head assembly

(ACE head) with the pin@ on the chassis unit.

After assembly, check that the clamp@ on the cleaner

2. roller assembly has snapped into the mounting of

the audio R/P head assembly (ACE head) @.

After assembly, clean the surface of the head with a

3. soft cloth or chamois.

After assembly, refer to section 4-3, and adjust the

4. head height, the azimuth and the tracking (X) position.

Fig.3-6-2

–14–

Page 15

3-7. CAPSTAN MOTOR

3-7-1. CAPSTAN MOTOR (See Fig.3-7-l )

1) Refer to section 3-2, then remove the mechanism unit.

2) Remove the two screws@, then remove the harness mounting 0.

3) Remove the reel belt~.

4) Remove the three screws@ and the capstan motor@.

ASSEMBLY NOTES:

1. Check that connector@ is inserted in the CP-I PWB

assembly.

2. When fitting the three screwso, use the torque gauge screwdriver (VHJ-0014). Give the screws a tightening torque of 3.5 kglcm.

3. After assembly, clean the capstan shaft with a soft cloth or chamois.

@Screws

3-7-2. CAPSTAN BRAKE ASSEMBLY (See Fig.3-7-2)

1) Remove the spring o.

2) Remove the clamp@, then remove the capstan brake assembly o.

@Spring

—

CaDstan shaft

@Reei belt

‘1

\~ (@Capstan

Fig.3-7-2

@;creks

Fig. 3-7-1

–15–

Page 16

3-8. LOADING MOTOR ASSEMBLY AND

WORM GEAR ASSEMBLY

(SeeF@.s-8-1)

Refer to section 3-2 and remove the mechanism unit. Remove the soldering on the lead wires@ of the

2) loading motorassemblyfrom the MC-1 PWBassembly.

When you do this, be careful not to let the soldering

iron touch any other parts. Press the clamp @, and remove the loading motor

3) assembly@l and the damper@. Be careful not to exert too much force on the clamp@. Remove the worm gear assembly@. To maintain

performance, do not dis-assemble the worm gear

assembly @.

ASSEMBLY NOTES:

Apply grease (VHJ-0010) to the teeth of the worm gear

assembly.

Check that the clamps@ and @ are securing the loading motor assembly. Check the polarity of the lead wires@ (the orange

3. wire is the positive terminal, and the gray wire is the

negative terminal). After soldering the lead wires@, adjust them so that they do not touch the friction gear assembly.

3-9. PINCH ROLLER PRESSURE

MECHANISM

3-9-1. PINCH ROLLER LEVER ASSEMBLY

(See Fig.3-9-1)

Remove the clamp o, then remove the pinch lift

mounting @. Remove the spring o, then remove the pinch roller

2) lever assembly@ offthepinch lift mounting@. Before you do this, align the Indentation@ on the pinch roller lever assembly@ with the clamp@ on the pinch lift mounting @.

ASSEMBLY NOTE:

1. Be careful to keep the surface of the pinch roller free of dust and dirt.

@Pinch roller lever

assembly

@lndent~tion

@Spring

@Worm gear assembly

Apply

‘~rease

@Damper

\, ~

]

~ N

@Loading motor assembly

@Lead wires

Clamps

Ii [\

_@ Clamp

‘> Orange:

positive

Gray: negative

Fig.3-8-l

@Clamp

h’

lift mounting

.----...,l= @ClamP

,,-

(

--- r,

Fig.3-9-l

–16-

Page 17

3-9-2. PINCH LIIT CAM AND PINCH CAM GEAR

(See Figs.3-9-2 and 3-9-3)

Refer to section 3-2 and remove the mechanism unit.

When you do this, make sure the mechanism is in EJECT mode.

Refer to section 3-9-1 and remove the pinch roller

lever assembly.

After removing thescrewo, undo thethreeclamps@,

3) then remove the opener mounting o.

Remove the clamp @ and the pinch lift cam@.

Remove the pinch cam gear @.

ASSEMBLY NOTES:

1. Apply grease (VHJ-0100) around the shafto, all over the teeth @ of the pinch cam gear ~, all over the teeth of the pinch lift cam@, all over the cam grooves

@, and all over the “V Part@” of the opener mounting @. APPIY 9rease WHJ-0101) to the outside of the

shaft @ and all over the top cam @ of the pinch cam gear@.

2. Check that the positioning mark@ on the mode switch@ isalignedwith the arrow@) on the MC-1 PWB assembly, as shown in Fig:3-9-3. Then align the triangular mark @ on the pinch cam gear@ with the arrow @ on the MC-1 PWB assembly. After that, align the round hole @ on the pinch lift cam @ with the indentation @ on the pinch cam gear@, If you have carried out the above alignments and the pinch roller will still not move up and down or perform the pressing movement correctly, refer to section 3-15 and check the alignment of the gear wheels 1 and 2, the main cam, and the mode switch.

@Triang.larmark , ~~ @Ro.nd hole

@Mode switch

2°

•*~~ on mode switch

(__’#dentati~

11Arrow on MC-1 PWB

assembly

@positioning marks

@Pinch lift cam

@)Pinch cam gear

Fig.3-9-3

cam

Fig.3-9-2

–17–

Page 18

3-10. L GUIDE LEVER ASSEMBLY AND

LOAD LEVER ASSEMBLY

(SeeF@s.3-10-1)

Refertosection 3-3 and remove the cassette mechanism assembly. Refer to sections 3-9-1 and 3-9-2 ,then remove the pinch

2) roller lever assembly and the opener mounting. After removing the washer @, remove the L guide

3) act lever assembly@.

Remove the special nut@, then remove the load lever assembly @ and the L guide lever spring@.

ASSEMBLY NOTES:

Apply grease (VHJ-0100) to the toothed area@ of the

1) L guide act lever assembly@ and around the shafts

@and@,

Refer to section 4-3 and adjust the height of the load

2) lever assembly. Hook the L guide lever spring@ into the stopper @

3) and load lever assembly@ shown in Fig. A. Put the pin @ of the L guide act lever assembly into

the cam groove @ of the crescent slide.

@L guide lever spring

3-n, BT LEVER ASSEMBLY (See Fig.3-11-1)

Refer to section 3-2 and remove the mechanism unit.

Refer to section 3-3-1 and remove the cassette — mechanism assembly. Remove the BT spring@.

Remove the clamp@ on the underside of the – mechanism chassis, then remove the BT lever assembly @. Remove the clamp @ on the band brake assembly@.

5) Then, as shown in Fig. A, align the other end of the

band brake assembly with the protruding parts of the BT lever assembly@ before removing it.

ASSEMBLY NOTES:

When fitting the BTleverassembly@, be careful not to

bend the stopper@

assemblyo out of shape by knocking it against them. Hookthe long hook of the BTspring@ into the BTlever

assembly@, as shown in Fig. B. After assembly, make sure that the mountings on

both ends of the band brake assembly@ are positioned as shown in Fig. C.

Afier assembly, refer to section 4-2-1, and make the

4. appropriate adjustment.

or the S incline mounting

(@Special nut

@Load lever%

assembly

@L guide lever spring ~

assem:b&

@L guide

act lever

@pin ‘>

@Cam groov

Fig. A

‘7 o

‘\

@Load lever assembly

@Shaft

@Stopper

Fig.3-10-l

Prot part

Fig.3-l 1-1

–18–

Page 19

3-12. REEL DRIVE MECHANISM

3-12-1. REEL BELT, REEL PULLEY, FRICTION GEAR

ASSEMBLY AND CLUTCH CHANGE LEVER

(See Fig.3-12-1)

Refer to section 3-2 and remove the mechanism unit. Remove the reel belto from the reel pulley@.

2) Take off the washer@ and remove the reel pulley@.

Take off the washer @ and remove the friction gear

assembly @.

Remove the clutch change spring @.

remove the clamp@ gripping the top of the mechanism chassis, then remove the clutch change Iever@.

Part A

,,--,

,79

@Hole “ ~“

%.R

A—

WScrews

+x’

1 +

@Hole

_ @Clutch

mounting assembly

ASSEMBLY NOTES:

1. After cleaning the shaftso and@, apply a drop of oil (VHJ-0099) to each.

2. Be careful not to get any grease on the reel belto.

@Clutch

spring

@Clam

n gear

bly

@Shaft

Fig.3-12-2

3-12-3. S SOtT LEVER, SUPPLY REEL ASSEMBLY

AND S REEL GEAR (See Fig.3-12-3)

1) Remove the S soft spring @).

2) Remove the clamp@, then remove the S soft Iever@).

3) Refertosection 3-12-2 and remove theciutch mounting assembly.

4) Refer to section 3-11 and remove the band brake assembly, then remove the supply reel assembly @

and the S reel gear@.

ASSEMBLY NOTES:

1. After cleaning the shafts@ and o, apply a drop of oil (VHJ-0099) to each.

2. After assembly, clean the side of the supply reel assembly @.

OS soft lever

@Supply reel

assembly

Fig.3-12-l

3-12-2. CLUTCH MOUNTING ASSEMBLY

(See Fig.3-12-2)

1) Refer to section 3-3-1 and remove the cassette mechanism assembly.

2) Refer to section 3-12-1 and remove the reel pulley.

3) Remove the two screws @, then remove the clutch mounting assembly @.

ASSEMBLY NOTES:

1. Align the two holes @ with the shafts @l and @. Be careful not to press part A of the clutch mounting assembly @ against the band brake assembly.

2. After assembly, make sure that the clamp on the clutch change lever has snapped into the chassis.

–19-

m soft

spring

@Clamp

@S reel

gear

aft

Fig.3-12-3

Page 20

3-12-4. T SOFT BRAKE ASSEMBLY, TAKE UP REEL

ASSEMBLY, T REEL GEAR (See Fig.3-12-4)

1) Remove the T soft spring@.

2) Remove the clamp @ , then remove the T soft brake assembly @.

3) Refer tosection3-12-2 and remove the clutch mounting assembly.

4) Pressing the T brake assembly@ in the direction of the arrow, remove the take up reel assembly@ and the T reel gear 6.

ASSEMBLY NOTE:

1. After cleaning the shaftso and @), apply a drop of oil (VHJ-0099) to each.

3-13. BRAKES

3-13-1. S BRAKE ASSEMBLY, T BRAKE ASSEMBLY,

T BRAKE ACT SLIDE (See Fig.3-13-l )

1) Refer to section 3-3-1 and remove the cassette _ mechanism assembly.

2) Remove the two clamps o, then remove the T brake act slide @. (Note: You can remove the S brake assembly @ and the T brake assembly @ without removing the T brake act slide @.)

3) Remove the brake spring o.

4) Remove the two clamps @) simultaneously, then remove the T brake assembly@.

5) Remove the clamp@, then remove the S brake assembly @.

@T reel gear

@T brake

assembly,

J&.

Take up reel assembly

@lT soft brake

sembly

T soft

spring

Fig.3-12-4

ASSEMBLY NOTES:

1. Apply grease (VHJ-0100) to the shafts@ and@.

2. When fitting the T brake act slide@, align the mark@)

with the shafto.

@Mark @T,brake act slide

@Brake spring ‘clamp

/’; \

Il.

Clamp

@T brake

assembly

OS brak~

assembly

-20-

Fig.3-13-l

Page 21

3-13-2. BRAKE CONTROL LEVER AND BRAKE ACT 3-13-3. S BRAKE ACT SLIDE AND BT SPRING LEVER

@~tiYF>’”@

LEVER ASSEMBLY (See Fig.3-13-2)

Refer to section 3-2 and remove the mechanism unit.

Refer to section 3-15 and remove the wheel gear 2. Refer to sections 3-12-1, then remove the reel belt and

3) the reel pulley.

Remove the clamp@), then remove the wheel gear I@. Remove the clutch change spring @.

5) Remove the clamps @) and@, then remove the brake

6) control lever@. Remove the clamp@ on the topside of the mechanism chassis.

Remove the brake return spring @. Refer to section 3-8 and remove the worm gear

8) assembly. Remove the clamp@ and clamp @, then remove the

9) brake act lever assembly@. To maintain the performance of the brake act Ieverassembly@, do not disassemble it.

ASSEMBLY

Apply grease (VHJ-0100) to the shafts@ and @), to the

teeth of the wheel gear 1 @, and to the pin @ of the

brake control lever@.

Put the pin@ of the brake control lever@ into the cam groove @ of the crescent slide.

Before fitting the wheel gear 1 @, align the hole @

with the hole @ on the mechanism chassis.

Refer to section 3-15 and align the wheel gear 2.

NOTES:

ASSEMBLY NOTES:

1. Apply grease (VHJ-0100) to the shaft@ shown in Fig.

2. After mounting the BTspring lever assembly@ on the

3. Make sure that the clamps @,@ and@ have snapped

ASSEMBLY (See Figs.3-13-3 and 3-13-4) Refer to section 3-16 and remove the crescent slide. Refer to section 3-12-1 and remove the friction gear assembly. Slide the S brake act slide @ in the direction of the arrow @, then remove it. Refer to section 3-11 and remove the BT spring. Press the BT spring lever assembly@ until it touches the pin @, then remove it.

3-13-3, and to the BT spring lever assembly@ and

the S brake act slideo shown in Fig.3-13-4.

Shaft @), hook the BT spring onto the clamp@ and press it until it touches the pin@.

into the S brake act slide @). Align the arrow @ on

the S brake act slide o with the arrow @ on the

mechanism chassis.

@Arrow on mechanism chassis

I ~ @BT spring

_ @Whe

gear

@Pin

Fig.3-13-2

Fig.3-13-3

Apply grease

OS brake

act slide

@BT spring

- lever assembly

-21-

Apply grease

Fig.3-13-4

Page 22

3-14. GUIDES

3-14-1. GUIDE ROLLER ASSEMBLY (See Fig.3-14-1)

1) Unscrew the two screws @). When you do this, be careful not to damage the cylinder or the video head.

2) Remove the two guide roller assemblies@ by unscrewing them anticlockwise.

ASSEMBLY NOTES:

1. Tighten the two screws @ to a torque of 600 g/cm. After tightening, apply a screw-locking glue.

2. After replacing the parts, be sure to clean the guide roller and carry out tape path adjustment as described in section 4-3.

@:&fre

assembly

3-14-2. S AND T INCLINE MOUNTING ASSEMBLIES

(See Fig.3-14-2)

Refer to section 3-2 and remove the mechanism unit.

Refer to section 3-5-2 and remove the cylinder unit.

Refer to section 3-1 and rotate the loading motor in

the PLAY direction until tape loading is completed.

Shift the S incline mounting assemblyo slightly, in the direction of the arrow@, then remove it from the S load lever assembly@.

Shiftthe Tincline mounting assembly~ slightly, in the

direction of the arrow @, then remove it from the T load lever assembly@.

ASSEMBLY NOTES:

1. Apply grease (VHJ-0100) to the rail (top, underside and sides) on the mechanism chassis.

2. When fitting the S and T incline mounting assemblies@) and@ into the rail, turn the loading motor manually in the EJECT direction. When tape unloading begins, watch out in case the S and T incline mounting assemblies and @ get caught in the rail.

3. After replacing the parts, clean the cylinder and the roller guide, then adjust the tape path as described in

section 4-3.

assembly

Fig.3-14-l

/“

OS incline mounting

assembly

‘yy;g

Pl!i!!!

Apply grease to the ~ 0 top, underside and ~ sides of the rail.

tsl

ha @)

“If

l’”

@T load lever

assembly

Fig.3-14-2

–22-

Page 23

3-15. WHEEL GEAR 2, MAIN CAM AND

MODE SWITCH

(SeeFigs.3-15-l andS-15-2)

Refer to section 3-2 and remove the mechanism unit. When you do this, make sure the mechanism is in EJECT mode.

Refer to section 3-7-1, then remove the harness mounting. Remove theclamp@, then remove the wheel gear 2@.

3) Remove the washer@, then remove the main cam @.

4) After unscrewing the screw o, remove the soldering

5) from the terminal of the mode switch@.

Remove the clamp@, then remove the mode

6) switch @.

@---

@Washer

@Clamp

ASSEMBLY NOTES:

Apply grease (VHJ-0100) to the shafts ~, @ and @,

to the teeth of the main cam@, and to the all over the

cam groove of main cam@.

When fitting the mode switch@, align it in@@) order

as shown in Fig.3-15-2. The alignment of the part@ is shown in Fig. A. Position the teeth of the mode switch @ so that the sixth tooth space left of part @ is aligned with the triangular mark on the pinch cam gear @. After aligning part @, refer to section 3-9-2 and check the positioning of the mode switch, the pinch cam gear and the pinch lift cam. Beforehand, remove the soldering from the soldered

part of the MC-1 PWB assembly, in order to prevent the mode switch @ being warped. Solder the mode switch @ after tightening the screw @ (See Fig. 3-15-1).

Align the hole in the crescent siide@ with the hole in the mechanism chassis, as shown at point@ in Fig.3-

15-2 (refer to section 3-16 and seethe holes@ and@ in Fig.3-16-1). When fitting the main cam@, position the mode

5. switch @ and the front rack gear@ as shown at points @ and@ respectively in Fig.3-15-2. When fitting the gear wheel 2@, position the main

6. cam @l and the wheel gear 1 @ as shown at points @ and@ respectively in Fig.3-15-2.

@Front

gear

@Cresce

aft

_l_f/-’/s, /

. . .

Fig.3-15-l

Marks on mode

switch @

–23–

, ,~) ‘~ main cam@)

W Tooth tip on

T’

b \Y @Wheel gear 1

Fig.3-15-2

gear 2

Page 24

3-16. CRESCENT SLIDE

(See Figs.3-16-l and 3-16-2)

Refer to section 3-2 and remove the mechanism unit. When you do this, make sure the mechanism is in EJECT mode.

Refer to section 3-3-1 and remove the cassette mechanism assembly. Refer to section 3-7-2 and remove the capstan brake

3) assembly.

Refer to section 3-12-4 and remove the T soft brake assembly.

Refer tosection3-13-l and remove the Tbrake act slide.

Refer to section 3-12-1, then remove the reel belt and the reel pulley.

Refertosection 3-15, then remove the wheel gear2 and the main cam. Refer to section 3-13-2, then remove the wheel gear 1

8) and the brake control lever. Remove the two screws~, then remove the crescent

9) mounting @.

10)

Remove the clampso and @, then raise the right end of the crescent slide @ slightly. Slide the crescent slide @ to the right until it comes away from the clamp @, then remove it.

ASSEMBLY NOTES:

Apply grease (VHJ-O1OO) to the points @,@,@ and @in Fig.3-16-1, and to the crescent slide @ shown in

Fig.3-16-2.

Before fitting the crescent slide @, refer to section 3-

13-3 and align the arrow on the S brake act slide with the arrow on the mechanism chassis. Then refer to Fig.3-17-3 and check that the S load gear andthe Tload gear have completed tape unloading. When assembling the parts, raise the right side of

3. the crescent slide @ slightly, and keeping it in this

position, slot the left side into the clamp@, then align the hole@ with the hole @ in the mechanism

chassis. When you do this, check that the hole~ is

aligned with the pin@ on the BT spring lever assembly, and that the hole@ is aligned with the pin @ on the S brake act slide, before pressing the crescent slide @ into place. Check that the clamps

@,@ and @ are engaged.

After assembly, check that each lever and each brake

is working properly.

@Crescent slide ,

Apply grease to the areas shown in 0

~ _>

●The places marked bydotsshould be greased

particularly generously.

Grease the teeth

cent

nting

Fig.3-16-l

Crescent slide

Fig.3-16-2

–24-

Page 25

3-17. S LOAD GEAR, T LOAD GEAR,

S LOAD LEVER ASSEMBLY AND

T LOAD LEVER ASSEMBLY

(T side)

Apply grease here

(see Figs.3-17-1,3-17-2and 3-17-3)

Refer to section 3-16 and remove the crescent slide.

Refer to section 3-14-2 and remove the S and T incline mounting assemblies. Remove the clamp o, then remove the components:

3) the S load gear@, the S load spring@ and the S load

lever assembly@. When you do this, be careful not to damage the clamp @, which can be damaged easily. Again, be careful when you disassemble the components, as the S load spring@ will spring out.

Remove the following components: the T load gear @, the T load spring @, and the T load lever assembly @. Be careful when you disassemble the components, as the T load spring@ will spring out.

ASSEMBLY NOTES:

1. Apply grease (VHJ-0100) to the shafts@, @ and parts

—

A shown in Fig.3-17-l. Then apply grease (VHJ-0100) to the parts shown in Fig.3-17-2.

2. When fitting the S load gear@ and the T load gear@ align them in the tape-loaded state, as shown in Fig. A in Fig.3-17-3. Again, after completing tape-unloading on these gears, check that they are positioned as shown in Fig. B in Fig.3-17-3, then refer to section 3-142 and fit the S and T incline mounting assemblies.

(S side)

Apply grease tothegears

the hole

Ap;l; grease here

Apply grease inside the hole

here

Fig.3-17-2

@T load

assem

@T I

Parts A (apply

grease he

@T I

Fi9.3-17-l

Fig. A: When tape loading is complete

T load gear

Fig. B: When tape unloading is complete

T load gear

S load gear

–25-

Fig.3-17-3

Page 26

3-18. TAPE SENSORS, REEL SENSOR AND

EP SW LEVER

3-18-1 TAPE TOP SENSOR AND TAPE END

SENSOR (See

Refer to section 3-2 and remove the mechanism unit.

Refer to section 3-3-1 and remove the cassette mechanism assembly. Remove the soldering from the MC-1 PWB assembly,

3) then remove the photo diodes~, @ and the LED

~. When removing the photo diode@ on the tape

top sensor side, refer to section 3-15 and remove the main cam.

Fig.3-18-1)

@Photo diode

(reel sensor) .

Mounting shaft for take up reel assembly

/’

Ml I

ASSEMBLY NOTES:

1. Fit the photo diodes @ and @ so that their photoreceptors to face the LED o, as shown in Fig.3-18-l.

Align the cuts in the LED@ and the holder@.

Push the photo diodes o, @ and the LED @ as far down as they will go, so that they do not protrude above the top of their holders.

2. Do the soldering quickly.

Turn the photoreceptors to face the LED @

@Phot

died (Tap sens

top

Iders

@Protrusion

Fig.3-18-2

3-18-3. EP SWITCH LEVER (See Fig.3-18-3)

Refer to section 3-3-1 and remove the cassette

mechanism assembly.

2) Remove the EP switch spring ~.

3) Remove the clamp@, then remove the EP switch lever @.

ASSEMBLY NOTES:

Apply grease (VHJ-0100) to the protrusion @ on the

back of the EP switch lever@.

After fitting the cassette mechanism assembly, check

that in EJECT mode, the EP switch lever@ does not touch the EP switch @.

&$@

I 1-‘Ep‘witch‘Pring

Front

Fig.3-18-l

3-18-2. REEL SENSOR (See Fig.3-18-2)

Refer to sections 3-12-2 and 3-12-4, then remove the

clutch mounting assembly, the T soft brake assembly and the take up reel assembly.

2) Refer to section 3-13-2, then remove the wheel gear 2, the wheel gear 1, and the brake control lever.

3) Remove the soldering from the MC-1 PWB assembly, then remove the photo diode (reel sensor)@.

ASSEMBLY NOTES:

When assembling the parts, align the cut on the

photo diode (reel sensor)o with the protrusion on the mechanism chassis @.

2. Do the soldering quickly.

–26-

@Protrusi

back (apply9

ch lever

Fig.3-18-3

Page 27

4. MECHANISM CHECKS AND ADJUSTMENTS

4-1. REEL TABLE TORQUE CHECK

I)With the power switch turned OFF, stick black vinyl tape

over the photo diodes of the tape sensors. Then turn the power switch ON. Front loading will begin. Refer to section 3-2 and Fig.3-2-2, and release the locks of the tray lock lever and the lid opener lever.

NOTES:

1. The measurements must be taken without any

incandescent light or daylight.

2. If the mechanism cannot be put into PLAY, FF or REW mode by the method described in 1) above, make a dummy cassette tape, as shown in Fig.4-l-2. The dummy cassette tape is made as follows: Unscrew

the five screws on the underside, remove the reels,

leaf springs and other parts on the supply and take up

sides, make holes in the upper surface as wide as the reel diameter, then assemble the parts.

Put the mechanism into REW mode, wait at least 10

seconds, then measure the torque value of the reel table on the supply side. It should be at least 600 g/cm. Take the measurement with the torque dial gauge

(VHJ-0004) held in position in your hand (lock torque). While taking the measurement, rotate the reel table

up reel assembly) on the take up side with your

(take hand so that the reel sensor does not respond. After switching to FF

and then measure the torque value of the reel table on the take up side. It should be at least 600g/cm (lock torque). After switching to PLAY mode, wait for at least 10

seconds and then measure the torque value of the reel table on the take up side. It should be between 80 and 140g/cm (lock torque).

mode, wait for at least 10 seconds

Make holes with

Dummy cassette

tape ~+,diameter as the reels.

roughly the same

Fig.4-l-2

4-2. ADJUSTING THE BT LEVER

ASSEMBLY POSITION AND CHECKING THE BACK TENSION TORQUE IN PLAY

4-2-1. BT LEVER POLE POSITION ADJUSTMENT

(See Fig.4-2-1)

Without loading a cassette tape, put the mechanism

into PLAY mode (turn the power switch OFF).

Adjust point@ on the band brake assembly by

rotating it so that the tip of the BT lever assembly is aligned with the line on the left side of the mechanism

chassis.

Refer to section 4-2-2 and check that the back tension

torque is between 30 and 50g/cm.

Align the end of the BT lever

# assembly with this line.

Torque dial gauge ~

(VHJ-0004)

$-;2

!......

{

Fig.4-2-l

4-2-2. CHECKING THE BACK TENSION TORQUE

PLAY MODE

Fig.4-l-l

—L, —

Mount the cassette torque meter (VHJ-0016) and switch to PLAY mode.

Check that the back tension torque is between 30 and 50g/cm.

Page 28

4-3. TAPE PATH ADJUSTMENT

In normal circumstances, the tape path system does not need to be adjusted. However, after removing or replacing one of the parts shown in Fig.4-3-1, you should check and adjust the tape path. The adjustment of the tape path is carried out while monitoring the envelope waveform of the video head output, using an oscilloscope. To make sure that the tape drawn off the reel runs freely and without excessive tension along all the tape guides and cylinders (drums), it is also important to check each tape guide by eye.

guide

S tape guide

BT post

tape gu

Full e head

4-3-2. LOAD LEVER ASSEMBLY HEIGHT

ADJUSTMENT (See Fig.4-3-2)

Refer to sections 3-9-2, and remove the opener mounting .

Position the height adjustment tool (VHJ-0102)@ under the full surface of the protrusion @ on the load lever assembly o, as shown in Fig.4-3-2.

Using your fingers, gently screw the adjustment nut @ clockwise into the nut box (VHJ-0048) @ until the protrusion@ of the load lever assemblyo touches the height adjustment tool (VHJ-0102)@ and the screw starts to feel tight. Next, loosen the adjustment nut@) by 270” anticlockwise.

Load a cassette tape (NTSC: T-160, PAL: E-240) and switch to PLAY mode. Check that when you do this, no scratches appear on the upper or lower edges of the tape. If scratches do appear, re-adjust the height.

Arrange the equipment so that the whole surface of the projection on the load lever assembly is positioned over

the height adjustment tool (VHJ-0102) when seen from

directly overhead.

L.._.._..—.._ ..2

Fig.4-3-l

4-3-1. ADJUSTMENT PROCEDURE

Select a PAL or NTSC alignment tape or blank cassette

tape, according to the transmission system of the VCR you are repairing.

NTSC:

PAL:

2. Clean the tape guides, the cylinder (drum), the capstan

3. Using an oscilloscope, adjust the height of the guide

NOTE: The contact point for the oscilloscope varies from one model to another, so to find the correct point for your model, refer to the figure entitled “Test point for tape path adjustment” in the electrical circuit section of the service manual.

4. When checking the tape path by eye, use a dental

For models with 525 scanning lines and a field

frequency of 60Hz

For models with 625 scanning Ines and a field

frequency of 50Hz

Shaft, the audio RIP head (ACE head) and the full erase head.

roller and carry out horizontal position adjustmerit, height adjustment and azimuth adjustment on the audio RIP head (ACE head). When observing the envelope waveform, bring the CH-I probe into contact with the envelope waveform test point, and bring the

CH-2 probe into contact with the switching pulse

(SW P) test point. While adjusting the tape path, set the trigger at the low side of the switching pulse

(SW P) in order to observe the output waveform on the CH-1 side of the video head.

mirror.

@Nut box

IH. .,

(VHJ-0048)

@Height adjustment

tool (VHJ-0102)

Fig.4-3-2

–28–

Page 29

—

4-3-3. GUIDE ROLLER HEIGHT ADJUSTMENT

(See Figs.4-3-3 and 4-3-4)

Play the Alignment Tape (NTSC: VHJ-0006, PAL: VHJ-

0009) and check that the envelope waveform is at its

maximum at the tracking centre. Then, after loosening the S guide roller and the T guide roller by rotating them anticlockwise, tighten them in turn until the

envelope waveform becomes flat. If the envelope waveform is not at its maximum at the tracking centre,

refer to section 4-3-4 and carry out a rough adjustment of the horizontal position of the audio R/P head (ACE

head) before adjusting the guide rollers. Adjust the S guide roller.

2) @ Press the tracking button (Channel -), and check

whether, when the envelope waveform has reached

51)~0 of its maximum, the front half of the envelope

waveform is flat. If not, fine-tune the S guide roller as follows. If the front half of the envelope waveform is as

shown in Fig.4-3-4 (a), this means that you have pressed the S guide roliertoo far. Therefore, loosen it slightly, and when it is in the state shown in Fig.43-4 (b), tighten it again, stopping when the envelope waveform is flat. If the front half of the envelope waveform is as

shown in Fig.4-3-4 (b), this means you have not

pressed the S guide roller far enough. Therefore, tighten it slightly, stopping when the envelope waveform becomes flat.

If the front half of the envelope waveform is as

shown in Fig.4-3-4 (c), it may happen that when you tighten the S guide roller, the wrapper waveform does not disappear, but sinks into the flat part, as shown in Fig.4-3-4 (d). If this happens, the status shown in Fig.4-3-4 (c) is normal, so loosen the S guide roller, then tighten it again until the envelope

waveform is as shown

@Check that at the tracking centre, the output of the

front half of the envelope waveform is not less than 80% of the maximum.

@ Rotate the S guide roller 20” anticlockwise. Adjust the T guide roller.

3) @Press the tracking button (channel - ) and check

whether, when the envelope waveform is

maximum, the back half of the envelope waveform is flat. If not, loosen the T guide roller slightly, then tighten it gradually until the back half of the envelope waveform becomes flat.

@Check that the output for the back half of the

envelope waveform is at its maximum at the

tracking centre.

Check that the envelope waveform does not fluctuate

4) when you switch from F-SEARCH to PLAY or from R-

SEARCH to PLAY. If it does fluctuate, repeat steps 3)

and 4).

. ‘!

in Fig.4-3-4 (c).

5(YYo of

Pressed

Normal

Eccentric screwdriver

f-+ (VHJ-0003)

too far far enough

If the envelope waveform

is at maximum at the tracking centre, adjust to flat.

(a) S guide roller pressed too far

~nll ~ol

S guide roller

The tape should not pass along the cylinder lead surface

In normal status, the waveform will be flat even when the envelope waveform is reduced

tO Soyo.

Not pressed

T guide roller

Fig.4-3-3

(b) S guide roller not pressed far enough

(d) S guide roller pressed too far

Fig.4-3-4

.—

–29–

Page 30

4-3-4. AUDIO R/P HEAD (ACE HEAD)

HEIGHT ADJUSTMENT,

AZIMUTH ADJUSTMENT AND

HORIZONTAL POSITION ADJUSTMENT

(1) Azimuth adjustment (See Fig.4-3-5)

Play the alignment tape (NTSC: VHJ-0005, PAL: VHJ-

0008) and observe the waveform of the audio output, using an oscilloscope.

Loosen the height adjustment screw in the counterclockwise direction and decrease the amplitude of the audio output waveform. In this state, tighten the screw in the clockwise direcion and maximize the amplitude. Slightly tighten the screw further in the clockwise direction and decrease the amplitude, and then loosen it slowly in the counterclockwise direcion until the amplitude starts to reach the maximum. Play the alignment tape (NTSC: VHJ-0006, PAL: VHJ-

0009) and observe the waveform of the audio output, using an oscilloscope.

Set the amplitude of the audio output waveform to maximum by rotating the azimuth adjustment screw. Make sure that the tape edge is running between the

5) top of the audio head and the bottom of the control head. Gaps A and B should be roughly equal.

NOTE: Rotate the adjustment screw with a slotted screwdriver. Do not apply excessive force vertically. As the height adjustment screw also adjusts tilt, rotate

it slowly. Do not rotate it excessively. And apart from the this screw, and height adjustment screw, the screws

is precisely adjusted before shipment from the factory,

and should not be tampered with. Tampering with these

screws can lead to scratching of the tape and other

problems.

Azimuth adjustment screw

I (ACE Head)

///

& >

‘s

Audio R/P head assembly

This screws is precisely adjusted and should not be tampered with.

Height adjustment screw

(2)

I-forhontalpositionadjustment (See Fig.4-3-6)

Play the alignment tape (NTSC: VHJ-0006, PAL: VHJ-

0009).

Press the tracking buttons (channel + and channel - ) simultaneously and set the tracking to the centre. Using an oscilloscope, observe the waveform of the -

3) video head output. Loosen the two fixed screws on the audio RIP head

4) (ACE head) by between 20” and 30” anticlockwise. Using a slotted screwdriver, adjust the position of

5) the audio RIP head (ACE head). At the position where the amplitude of the envelope waveform is at its maximum at the tracking centre, tighten the fixed screw on the audio RIP head (ACE head). When you do this, check that the envelope waveform changes equally whether the tracking is shifted by pressing the tracking button in the plus or the minus direction.

Play the alignment tape (NTSC: VHJ-0007 PAL: VHJ-

0052) and check that the amplitude of the envelope waveform is at its maximum at the tracking centre. If

not, repeat steps 1) to 6).

Refer to the electrical adjustments section of the – service manual, and adjust the switching position of the servo circuit.

NOTE:

1. When you press the tracking buttons (channel+ and channel - ) simultaneously, the tracking is reset to the tracking centre. When the tracking is at the tracking centre, the message “T - : clock display on the front panel. If you keep pressing the channel - button the messages “T -: “ and “T --: “ will appear, while if you keep pressing the channel +

button, the messages “T : -“ and “T :-- “ will appear.

Three seconds after you stop pressing the tracking

buttons, the clock display will re-appear.

2. The check described in paragraph 6) is not necessary for models in which the only tape speed is SP mode.

After resetting the tracking to the tracking centre, set the envelope waveform to maximum.

“ will appear in place of the

~ Slotted

screwdriver

Audio head

Control head

Scr

mbly

A=B

Fig.4-3-5

Fig.4-3-6

–30-

Page 31

4-3-5. CHECKING AITER ADJUSTMENT

Play the alignment tape (NTSC: VHJ-0006, PAL: VHJ-00

09) and check that the envelope waveform is activated immediately and that there are no fluctuations in the

—

‘-

envelope waveform or the audio output waveform.

Load a cassette tape (NTSC:T-120, PAL: E-180) and use it to record and replay. Check that the envelope

waveform is activated immediately and that there are

no fluctuations in the envelope waveform or the audio output waveform. (When recording on the tape, input

lkHz to the audio input terminal. Use a scratch-free

cassette tape (NTSC: T-120, PAL: E-180 ).) Check that at

the tracking centre, the front half down and back half

down are not more than 20% of the value at the point where the envelope waveform amplitude is at its maximum.

Check that the envelope waveform is activated immediately when you switch from PLAY to RSEARCH or from R-SEARCH to PLAY. Check that

there is no slack in the tape next to the pinch roller.

Check that the envelope waveform is activated immediately when you switch to PLAY from FF, REW, F-SEARCH, R-SEARCH or STOP mode. Check that there is no slack in the tape next to the pinch roller.

Check that the tape is not curling or riding up on the upper or lower flanges of the tape guides in PLAY, FF, REW,. F-SEARCH or R-SEARCH modes.

Check that in PLAY mode, the tape runs as shown in Fig.4-3-7.

Load a tape (NTSC: T-160, PAL: E-240) and play it back. carry out the checks described in steps 3) to 5) above.

—

No.O guid

BT post head

Full ‘erase

guide

Pinch roller

Capstan shaft

Fig.4-3-7

-31-

Page 32

—

JanJ’95/l1500 PrintedinJapan

—

SANYO Electric Co., Ltd. Osaka, Japan

Page 33

Notice

S!qw

● CORRECTION

❑

SERVICE FLASH

❑ ❑

Please add this notice to the manual listed below.

Category: VIDEOCASSEITE RECORDER

Model: V951 MECHANISM

This correction notice is a revised edition of the V951 mechanism basic service technical information (Reference No. MM531433).

2-2. AN OVERVIEW OF THE MECHANISM MODES 2-2-1. MECHANISM MODE SWITCHING TABLE

NOTE: The letters and figures enclosed in circle<

IEX

)ATA

<~1 Distinguished by whether the

.’ ,’,’

Mechanism mode

EJECT@)

EP switch is ON or OFF. Horizontal shift section.

Vertical shift section,

PRODUCTION CHANGE

❑

ADD INFORMATION

❑ ❑

Ithe mechanism mode column are the codes on the crescent slide.

FILE NO.

Date:

REF : No. IW’U1531433

The principal mode-switching states of the mechanism

July/l 0/

’95

INITIAL @

Cleaner roller assembly ON

Sfl mounting incline assembly

pressure begins.

S~ mounting incline assembly

pressure ends.

‘

<—1 REVIEW@

<=1

~ pLAy/STOP @

IDLER pOS,@ (PinchrollerOFF)

STILUSLOW @

BRAKE

FFIREW @

POS. @

When loading is carried out starting at the CASSE_lTE IN position.

REW

I!l

-1 I

I I I I I I I I

, I

I I I I

Vvt

IEVIEW

WAY

CUE

Printed in Japan

SANYO Electric Co., Ltd

Osaka,Japan

REFERENCENo.MM531433-01

Page 34

MODE SWITCH OUTPUT TABLE

APPEARANCEOF MODESWITCHAND

RELATIONSHIP BETWEEN MODE POSITIONS

3 2.5V H L 4 3.4V L H 5 3.4V L H 6 2.oV L L 7 2.OV L L

E#El

2-2-2. MOVEMENT CHECK LIST FOR THE MAIN PARTS OF THE MECHANISM

L OV

H 5V

L OV

H 5V

L OV

STILIJSLOW:-+! .:. :%

.......

REVIEW:::::::::::::::::::::::::”:”:::;::::

Mechanism mode

Principal parts

T brake assembly S brake assembly T soft brake assembly

lever

S soft

BT lever assembly BT spring Pinch roller lever assembly Clutch mounting assembly Load lever assembly Capstan brake assembly S and T incline mounting assembly LO Cleaner roller assembly

OFF

OFF OFF

ON ON OFF OFF OFF OFF

PLAY PLAY UNLO UNLO

OFF OFF

~ # ;

a T w ~ Z-3

OFF ON

:;Oii

UP UP

PIAY

UNLO LO

OFF

ON ON ON OFF OFF

OFF

OFF OFF ON(WI ON(W)

OFF

%WN

PLAY PLAY PLAY

OFF OFF OFF

OFF

(ON)

OFF

u 2

OFF OFF

OFF ON ON

DOWNI ON

LO LO LO LO

UNLO

(ON) OFF

‘

OFF

~, .................,.,.,.,.”.”.

(S): Strength

; ~ “’

5 ,

OFF

OFF OFF

OFF OFF OFF OFF

ON ON

ON(S) ON(S) ON(S) ON(W)

ON ON

OFF

PLAY PLAY PIAY

OFF ON OFF

OFF OFF OFF OFF

OFF

;

$ <

OFF

LO LO

(W): Weakness

ON ONIOFF

ON ON/OFF

OFF OFF

PLAY

OFF OFF

—

2-2-3. HOW TO CHECK THE MECHANISM MODE

POSITION

You can tell which mode the mechanism is currently in by looking at the codes and marking-lines on the crescent slide on the underside of the mechanism chassis. The edge of the crescent mounting is used as the reference line, as shown in Fig.2-2-2, and the marking-lines and symbols

Example: In Fig.2-2-2, marking-line 6 is aligned with the

reference-line on the crescent mounting, so the mechanism is seen to be in FF/REW mods.

2-2-4. SELF-DIAGNOSIS DISPLAY

Some medals are equipped with the SELF-DIAGNOSIS DISPLAYS function. Use it asa means of finding outthe symptoms and cause of the error before performing repairs. For details, refer to the separate service manual for the respective models.

The edge of the crescent mounting

Crescent mounting

Fig.2-2-2

...

.“. ,’,

.’. .’. .’, .’.