Sanyo VHR-1110 Series User manual

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6

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SERVICE

MANUAL

COLOUR

VIDEO

CASSETTE

RECORDER

VHS

PAL

Models

VHR-1110

eee

VHR-1700M

VHR-2300

rl

n

VHR-2500

Series

and

VHR-2350EE

VHR-2700

MECHANISM

DESCRIPTION

AND

MECHANISM

ADJUSTMENT

TABLE

OF

CONTENTS

1.

MECHANIMS

DESCRIPTION

PAGE

1-1.

MAIN

MECHANISM

COMPONENTS

AND

LAYOUT

DIAGRAM

...........

0.00

eve

eeee

1~2

1-2,

OUTLINE

OF

MECHANISM

OPERATION

..........

0...

cece

ee

te

eee

eens

3

1-3...

DIFFERENCES

FROM

PREVIOUS

MODELS

20

o

a

ta

eee

eee

ee

Rea

wae

3~5

1-4,

MECANISM

OPERATION

INEACH

MODE

...........

0.

cece

cee

et

ee

eee

6

be

“OPERATION

JIN-EACH

MODE:

2.4.54

4

44

te

eG

ee

and

mae

eee

ORM

OR

ae

ak

ae

7~10

2.

MECHANISM

ADJUSTMENT

2-1.

JIGS

AND

TOOLS

FOR

ADJUSTMENT...

10...

..

eee

ce

ee

ee

tees

11

2-2.

STANDARD

MAINTENANCE

TIMETABLE...

1...

ee

ee ee

tees

12

28

CLE

IN

IN Gi

i

set

seca

akg

Meck,

Wee

ott

hs

ke

th

Sole

tee

ae

etc

hte

here.

nepal

nara

tere

ab

ea

ab

at

Beata

13

2-4.

MECHANISM

REPAIR

AND

PARTS

REPLACEMENT

........

0...

cee eee

eee

eee

14~21

2-5.

PREPARATIONS

FOR

ADJUSTMENT...

0.0...

0...

eee

ee

ee

ens

22

2-62

“ADJUSTMENT

«sae

Seeley

&

be

eG

Re

iees

Pa

hE

O

OSE

ASE

eS

Ses

23~28

2-7.

CHECKING

AND

ADJUSTING

THE

TAPE-TRANSPORT

SYSTEM

..........

0000s

eee

29~31

Reference

No.

WM-18674

1.

MECHANISM

DESCRIPTION

1-1.

MAIN

MECHANISM

COMPONENTS

AND

LAYOUT

DIAGRAM

(Figs.

1-1-1

and

1-1-2)

Loading

Motor

Full-width

erase

head

8g

RABIES

DCN

ASO

IEE

Impedance

roller

Bs

3

ii

=

avin

re

=

2.

o

os

Capstan

Motor

shaft

Leading

guide

Review

guide

(Supply-side)

lever

Leading

guide

(Take-up

side)

:

Loading

Brake

NI

Tape

Sensor

™

Back-Tension

lever

Brake

Band

Take-up

Reel

base

Supply

reel

base

Se

ee

ees

Soft

Brake

(Take-up

side)

Soft

Brake

(Supply

side)

Erase

Prevention

SW

Main

Brake

Idler

stopper

Roller

Assy.

Main

Brake

(Supply

side)

(Take-up

side)

Fig.

1-1-1

Mechanism

Assembly

Top

View

SR

main

changed

parts

compared

to

former

models

VHR-1100,

VHR-1300

and

VHR-1500.

Pulley

(Loading

Motor)

Small

belt

Two-step

Pulley

Large

Beit

Small

Pulley

eee

ress

tit

geal

|

Press-fit

gear

nae

a

(Supply

side)

1

Capstan

Motor

Large

Pulley

Capstat

belt

;

%

Two-step

gear

m

:

(small)

Two-step

gear

Main

Slide

Sector

gear

Solenoid

!

VA

(VHR-2500

|

i

x

¢

Sneeptaiar

‘

Momentary

Brake

'

Intermediate

gear

series

only)

Mode

Detection

switch

Review

gear

Main

slip

gear

POM.

Lever

Sub

slide

Momentary

Brake

slip

gear

Fig.

1-1-2

Mechanism

Assembly

Bottom

View

1-2.

OUTLINE

OF

MECHANISM

OPERATION

The

greatest

change

compared

to

former

models

(VHR-

1100,

VHR-1300

and

VHR-1500

series)

is

the

change

of

rotation

of

both

reel

bases

from

the

reel

motor

to

the

capstan

motor.

well

as

the

movement

of

both

guides,

the

transition

device

to

each

mode,

and

the

safety

device,

are

fundamentally

the

same

as

for

previous

models

(VHR-1100,

VHR-1300

and

VHR-1500

series),

so

their

description

is

omitted

here.

1-3.

DIFFERENCES

FROM

PREVIOUS

MODELS

(VHR-1100,

VHR-1300

and

VHR-1500

series)

There

are

five

points

which

are

different,

regarding

the

mechanism’s

main

components,

between

this

mechanism

and

that

of

former

models.

The

operation

of

those

components

is

described

below.

1-3-1.

Method

of

drive

transmission

of

both

reel

bases

By

using

this

mechanism,

the

reel

motor

is

eliminated,

and

the

rotation

of

the

capstan

is

transmitted

via

the

belt

to

the

main

slip

gear;

the

direction

of

reel

base

rotation

depends

upon

the

direction

of

rotation

of

the

capstan.

As

a

result,

it

can

be

seen

that

the

function

of

the

newly

added

main

slip

gear

is

very

important.

Figure

1-3-1

shows

the

rotation-transmission

system.

*Main

slip

gear:

The

slip

mechanism

functions

during

the

PLAY,

REC,

F/R-SEARCH

and

SLOW

modes.

In

other

words,

because

force

is

transmitted

from

the

pulley

gear

to

the

drive

gear

via

the

felt

for

slippage

during

these

modes,

the

rpm

of

the

drive

gear

is

caused

to

be

reduced

to

less

than

the

rpm

of

the

pulley

gear.

The

pulley

gear

and

the

drive

gear

are

locked

during

the

F-FWD

and

REW

modes,

with

the

result

that

the

rotation

of

the

pulley

gear

and

of

the

drive

gear

is

the

same

rotation.

*

Review

gear:

The

review

gear

is

engaged

with

the

main

slip

gear

during

the

R-SEARCH

mode.

Capstan

Motor

Main

slip

gear

Drive

gear

Pulley

gear

Supply,

Take-up

reel

base

Drive

gear

Felt

for

slippage

Pulley

gear

Roller

Assy.

Fig.

1-3-1

1-3-2.

Main

slip

gear

(Fig.

1-3-2(a)

and

Fig.

1-3-2(b))

The

main

slip

gear

is

composed

of

the

pulley

gear

and

the

drive

gear.

A

slip

mechanism

made

of

felt

is

incorporated

at

the

drive

gear

side.

Figure

1-3-2(a)

shows

the

ordinary

conditions

(PLAY,

REC,

F/R-SEARCH,

UNLOADING,

SLOW,

etc.).

When

the

capstan

motor

rotates

during

these

conditions,

the

pulley

gear

is

caused

to

be

driven,

and

thus

the

drive

gear

is

caused

to

be

driven

via

the

slip

mechanism.

Figure

1-3-2(b)

shows

the

fast

forward

and

rewind

condi-

tions.

The

FF

lever

is

caused

to

move

in

the-»direction

by

the

sub

slide

being

activated

in

the

loading

direction

by

the

movement

of

the

cam.

As

a

result

of

this

action,

the

spring

coil

located

between

the

FF

lever

and

the

direct

lever

is

caused

to

be

pulled,

with

the

result

that

the

lock

ring

is

caused

to

be

activated

in

the

lifting

direction.

As

a

result,

the

pulley

gear

and

the

drive

gear

are

caused

to

be

locked,

and,

when

the

capstan

motor

rotates,

the

pulley

gear

and

drive

gear

rotate

as

a

unified

component,

with

the

result

that

there

is

no

slippage.

Pulle

eet

a

ald

Main

slip

Spring

Direct

lever

Fig.

1-3-2(a)

Slip

condition

FF

lever

Direct

lever

Fig.

1-3-2(b)

Lock

condition

—4q—

1-3-3.

Review

gear

This

gear

functions

during

the

R-SSEARCH

mode.

Because

tape

take-up

during

the

R-SSEARCH

mode

is

via

the

drum,

a

stronger

rotation

(than

for

the

F-SEARCH

mode)

is

necessary.

Detection

Main

slide

(The

rotation

torque

during

the

F-SSEARCH

mode

is

70

+15g-cm,

and

during

the

RSSEARCH

mode

is

200

+30g-cm.)

For

this

reason,

the

review

gear

is

used

to

increase

the

rotation

torque

of

the

main

slip

gear

(pulley

gear

and

drive

gear).

Main

Slip

Gear

ee

ee

Review

gear

Moving

the

main

slide

from

PLAY

mode

©

to

R-SEARCH

mode@®.

Fig.

1-3-3

1-3-4,

Capstan

“soft’”’

braking

by

solenoid

(Fig.

1-3-4

VHR-2500

series

only)

The

“soft”

braking

is

switched

ON

during

the

SLOW

mode

and

the

STILL

mode.

The

capstan

motor

operates

under

intermittent

drive

conditions

during

the

SLOW

mode

and

the

STILL

mode.

In

order

to

stabilized

the

intermittent

drive

of

the

capstan

motor,

a

solenoid

is

used

to

apply

braking

to

the

capstan

motor.

Capstan

Motor

Capstan

soft

brake

Solenoid

The

voltage

applied

from

the

system-control

circuitry

to

both

terminals

of

the

solenoid

during

the

SLOW

mode

and

the

STILL

mode

is

13V.

1-3-5.

Loading

brake

(Fig.

1-3-5)

In

order

to

eliminate

tape

loosening

or

slack

during

the

loading

operation,

braking

is

applied

to

the

supply

reel

base

side

during

loading.

When

the

loading

operation

is

finished,

the

loading

brake

is

released.

Ue

j

ifn

gy

Nn

Pde

Loading

brake

Supply

reel

base

5

E

:

O

Idler

stopper

1-4.

MECHANISM

OPERATION

IN

EACH

MODE

a

ets

Capstan

Motor

Drum

Motor

Loading

Motor

(Table

cerns

Supply

|

Take-up

|Supply

|

Take-up

side

side

side

side

|

SoftBrake

|

Brake

Mode

Detection

Loading

Brake

(Supply

Reel

Base)

Position

ON

OFF

ON>OFF

ON

ON

PLAY/REC|

OFF

ON

OFF

|

OFF

(CW)

oan

F-SEARCH|

OFF

ON

OFF

|

OFF

(CW)

con

ON

REVERS

rite

ee.

bee

ac

ace

MORE

gee

lh

Ane

Rox

SLOW

(VHR-2500|

OFF

OFF

|

OFF

ON

OFF

OFF

series

only)

(cew)

ON

ON

ON>OFF

PAUSE

OFF

OFF

(ewocew)

coed

OFF

|

OFF

ata

ON

OFF

@)

ON

ON>OFF

EJECT

icw)

OFF

eewl

OFF OFF

ON

ON ON

OFF

OFF

Gd)

Notes:

1.

CW:

clockwise

CCW:

counterclockwise

The

rotation

of

the

front-loading,

reel,

capstan

and

drum

motors

is

as

seen

from

the

chassis

top,

and

the

rotation

of

the

loading

motor

is

a

seen

from

the

bottom

of

the

chassis.

ON/OFF

of

brakes:

ON:

Brake

is

applied

to

reel

base.

OFF:

Brake

is

not

applied

to

reel

base.

nS

Table

1-4-1

1-5,

OPERATION

IN

EACH

MODE

For

this

model,

both

ree!

bases

are

rotated

according

to

the

drive

by

the

capstan

motor.

As

a

result,

the

method

employed

for

transmission

of

the

rotation

of

both

reel

bases

has

been

changed

from

the

reel

motor

used

for

previous

models

(VHR-1100,

VHR-1300

and

VHR-1500

series)

to

the

capstan

motor.

Even

though

the

operation

for

each

mode

has

changed

from

the

reel

motor

to

the

capstan

motor,

the

movement

of

the

mechanism

is

fundamentally

the

same

as

for

previous

models.

1-5-1.

From

STOP

mode

to

PLAY

mode

CPLAY)

button

is

pressed.

Mode

Detect

SW

®@.

Head

Motor

100ps

PLA

Capstan

Motor:

RWO

|

12V

Lo.

Tape

Loading

Motor

‘aoe

Unto.

Main

brake

ro

100ms

The

movement

of

the

motor

and

brakes

during

the

follow-

ing

four

operations

is

described

by

timing

chart,

and

the

explanation

is

omitted

here.

(1)

From

STOP

mode

to

PLAY

mode

(2)

From

PLAY

mode

to

R-SEARCH

mode

(3)

From

REC

mode

to

REC

PAUSE

mode

(4)

From

STOP

mode

to

F-FWD

(REW)

mode

(5)

From

PLAY

mode

to

STOP

mode

Moving

the

Leading

guide

to

loading

direction.

PLAY

mode

(@!

Leo)

Y

Rotation

PLAY

Rotation

a

5SV

1

DY,

Cie

eS

SOS)

<r

(Supply

reel

base

side)

~{OFF

Soft

brake

(Supply

reel

base

side)

(

;

{ON

Loading

brake

;

\

'

Main

brake

fh

eo

(Take-up

ree!

base

aie

ggg

Sl

ae

es

i]

Soft

brake

1

rc,

Cr

(Take-up

reel

base

Sid@)

ope

pes

ee

ee

Review

brake

;

ON

a

SE

ae

ees

Table

1-5-1

Timing

chart

of

from

STOP

mode

to

PLAY

mode

1-5-2.

From

PLAY

mode

to

R-SEARCH

mode

button

is

pressed.

|

R-SEARCH

mode

Mode

Detect

SW

—_

Head

Motor

(i

Seen

i

f]

1

{

|

u

1

Capstan

Motor

sewo;

|

rt—“:;Cs*s*s*~C—C—C—s—~sdrSCSCidY

#RWO

|

PF

200s

ec

|

RVS

PLAY

Rotation

Lo.

300

psec

a

R-SEARCH

Rotation

Tape

Loading

Motor

p

g

5,

ee

Tl

Sonsec

Main

brake

Unlo.

5.5V

|

l

(Supply

reel

base

side)

—{OFF

Soft

brake

ON

(Supply

ree!

base

side)

(OFF

Loading

brake

—(oFF

Main

brake

ON

(Take-up

reel

base

side)

(FF

Soft

brake

$n

(Take-up

reel

base

side)

—{orrF

}p—-—

$$

ON

Review

brake

—(OFF

ec

eS

I

Table

1-5-2

Timing

chart

of

from

PLAY

mode

to

R-SEARCH

mode

1-5-3.

From

REC

mode

to

REC

PAUSE

mode

PAUSE/STILL)

button

is

pressed.

REC

PAUSE

mode

Mode

Detect

SW

Nn

Head

Motor

1

|

I

i

|

'

y

|

Capstan

Motor

+Fwol

Short

REV

{RWD

|

:

I.

12V

ry

+

|

tot

' 1

|

I

1

PLAY

Rotation

|

!

|

tol

i

l

! i

|

an)

[7]

sec

3

L

ri

ed

mate

:

|

Tape

Loading

Motor

¢}

>]

=

9°

=5.5V

5Opsec

-5.5V

Main

brake

(Supply

reel

base

side)

—{oFF

ae

Gree

ee

(Supply

reel

base

side)

—{OFF

Loading

brake

(FF

jp

Main

brake

(Take-up

reel

base

side)

—{OFF

|

Soft

brake

(Take-up

reel

base

side)

CN

a

evant

Se

ee

AREF

Si

Se

ae

Table

1-5-3

Timing

chart

of

from

REC

mode

to

REC

PAUSE

mode

—38—

1-5-4.

From

STOP

mode

to

F-FWD

mode

(See

Fig.

1-5-1,

Table

1-5-4)

When

the

FF

button

is

pressed

during

the

STOP

mode,

the

mode

changes

to

the

F-FWD

mode.

The

movement

of

the

main

gear

at

this

time

is

as

described

below.

As

a

result

of

the

movement

of

the

sub

slide

in

Fig.

1-5-1

in

the

direction

of

arrow

G),

the

FF

lever

is

caused

(by

the

hook

of

the

sub

slide)

to

move

in

the

direction

of

sub

slide

@.

Direct

lever

to

be

moved

in

the

perpendicular

up

direction

@

Review

gear

button

is

pressed.

Mode

Detect

SW

chs

@)

Head

Motor

Capstan

Motor

Tape

Loading

Motor

Main

brake

Soft

brake

Direct

Lever

F-FWD

(REW)mode

The

spring

located

between

the

FF

lever

and

the

direct

lever

is

thus

caused

to

be

pulled,

causing

the

direct

lever

to

be

moved

in

the

perpendicular

up

direction,

with

the

result

that

the

main

gear

@)

is

driven

directly.

At

the

same

time,

the

review

gear

is

caused

to

move

away

from

the

main

gear,

with

the

result

that

the

main

gear

rotates

at

high

speed.

F-F

Lever

Q+—

Sub

slide

Main

slip

gear

STOP

mode

'

.

psec

ON

FE

(Supply

reel

base

side)

—(OFF

)

|

(OFF

|

i

Loading

brake

|

|

|

Main

brake

on

(Take-up

reel

base

side)

|

Soft

brake

(Take-up

reel

base

side)

—{orF

)

oN

}-—

Review

brake

——{

OFF

oe

|

sa

cg

aaa

!

Table

1-5-4

Timing

chart

of

from

STOP

mode

to

F-FWD

(REW)

mode