Sanyo VHR-757G Manual de usuario

FILE

NO.

SANYO

SERVICE

MANUAL

Video

Cassette

Recorder

VHR-757G

(Product

Code

143

171

65)

(Switzerland

Italy)

VHR-757EX

(Product

Code

143

171

64)

(Europe)

VHR-757NL

(Product

Code

143

171

66)

(Netherlands)

VHR-777EV

(Product

Code

143

171

67)

(Europe)

(VHR-757G,

VHR-757EX,

VHR-757NL)

VHS

777

(Product

Code

143

171

23)

CONTENTS

(Europe)

SELF-DIAGNOSIS

DISPLAY

cssscscccscsssseccesssssssesenssesesnseseveneee

R-797

DISASSEMBLY

.....ccccccccccsssccsecssescecsesessucssesecssuessessnessuseneeness

ELECTRICAL

ADJUSTMENT

.....scssssssssssssssesscssssessessseeeesnes

(Product

Code

143

171

12)

TEST

POINTS

FOR

TAPE

PATH

ADJUSTMENT

...........+.

(Spain

Portugal)

PARTS

LIST

Please

see

other

materials

with

Reference

MECHANISM

PARTS

.....csscsscsseecsseecsescsvsesseceseessesssseesseesseens

number

given

table

below.

CABINET

CHASSIS

PARTS

...cccescccssscsscsesesseesseessecesseenes

ELECTRICAL

PARTS

..cccccessccoscsccusecsnscccssseccuccscneecsneecosecese

Materials

Model

No.

ACCESSORIES

....cccccsscesssescseccuscccconesueesuscuessasessesaseoneseeeene

V95

PACKING

MATERIALS

cccsssssssssssssssssssssscssssesescssescescssseseeeee

KiSchanicn'l'Mechanaml

CIRCUIT

DIAGRAMS

(Refer

the

separate

volume)

Manual

V95

aaesaees

Mechanism

5315

PRODUCT

SAFETY

NOTICE

The

components

designated

symbol

(/\\)

this

schematic

diagram

designates

components

whose

value

are

special

significance

product

safety.

Should

any

component

designated

symbol

need

replaced,

use

only

the

part

designated

the

parts

List.

not

deviate

from

the

resistance,

wattage,

and

voltage

ratings

shown.

NOTE:

Parts

order

must

contain

model

number,

part

number,

and

description.

Substitute

parts

may

supplied

the

service

parts.

N.S.P.

Not

available

service

parts.

Design

and

specifications

are

subject

change

without

notice.

REFERENCE

No.SM531579

MP4H/G5,

EX5,

NL5,

EV3, EX3,

SELF-DIAGNOSIS

DISPLAY

Mechanism

Mode

Display

Head

Output

Drop

Warning

Display

Cylinder

Rotation

Accumulated

Time

Display

This

unit

displays

the

diagnosis

contents

abnormalities

and

the

mechanism,

mode

its

display

panel

2-digit

numbers.

When

the

head

playback

output

has

dropped,

the

"L"

sign

will

blinked.

Some

models

(listed

later)

will

also

display

the

cylinder

rotation

accumulated

time.

These

display

shows

the

outline

the

problems.

Use

reference

when

servicing

the

unit.

Self-Diagnosis

Contentes

and

Mechanism

Mode

Display

When

the

STOP

button

the

remote

control

pressed

for

about

seconds

continuously,

the

self-diagnosis

number

will

displayed

the

reception

channel

display

the

display

panel

and

number

indicating

the

failed

mechanism

mode

(changed

mode

when

being

shifted)

the

tape

counter

"seconds"

display

for

10'seconds

each.

—

During

self-diagnosis

display,

displays

other

than

the

diagnosis

number/mechanism

mode

number

and

the

cylinder

accumulated

rotation

time

display

described

later

(some

models

only)

will

turned

off

and

when

displays

end,

the

normal

display

will

returned

automatically.

Refer

"Self-Diagnosis

Contents"

for

the

self-diagnosis

numbers

and

the

"Mechanism

Mode

Display

Contents"

for

the

mechanism

mode

numbers.

When

the

"0"

button

the

remote

control

unit

pressed

during

display,

and

clearing

the

self-diagnosis

display

and

mechanism

mode

display.

Display

panel

Self-Diagnosis

number

Mechanism

mode

number

(Reception

channel

display)

(Tape

counter

"Seconds"

display)

Self-Diagnosis

Contents

Mechanism

Operations

and

State

After

Occurrence

Shifts

the

STOP

mode.

There

abnormality

the

mechanism.

The

cylinder

motor

does

not

rotate.

The

cylinder

motor

faulty.

The

control

the

cylinder

motor

faulty.

The

tape

winds

around

the

cylinder.

The

take-up

reel

caught.

The

reel

belt

faulty.

The

take-up

torque

has

decreased.

The

capstan

motor

faulty.

The

control

the

capstan

motor

faulty.

Error

the

operations

the

tape

mechanism.

Foreign

particles

the

tape

load-

ing

mechanism.

The

tape

end

sensor

faulty.

The

reel

brake

the

tape

cassette

has

not

been

released.

The

tape

guide

caught.

The

motor

faulty.

The

control

the

motor

faulty.

The

take-up

reel

does

not

rotate.

Shifts

the

STOP

mode.

The

capstan

motor

does

not

rotate.

Shifts

the

STOP

mode.

Unloads,

shifts

the

INITIAL

mode,

and

the

power

goes

off.

The

tape

cannot

loaded

with

the

cassette

inserted.

(But

unloading

can

performed.)

Tape

and

unloading

cannot

performed

with

the

cassette

in-

serted.

The

power

forcibly

turned

off

with

the

mechanism

its

current

position.

Mechanism

Operations

and

State

After

Occurrence

Front

unloading

cannot

performed

The

cassette

drive

mechanism

Front

loads

and

shifts

the

STOP

when

ejecting

the

cassette.

faulty.

INITIAL

mode.

(Front

can

performed.)

The

front

door

caught.

When

the

power

switch

turned

before

eject

operations:

Shifts

the

STOP

mode.

When

the

power

switch

turned

off

before

eject

operations:

Shifts

the

INITIAL

mode

and

the

power

goes

off.

Front

and

front

unloading

can-

The

tape

cassette

caught

the

The

power

forcibly

turned

off

with

not

performed

when

ejecting

the

cassette

drive

mechanism.

the

mechanism

its

current

position.

cassette.

The

main

cam

and

front

rack

gear

the

front

mechanism

have

not

engaged

properly.

The

gears

the

front

drive

mechanism

have

not

engaged

prop-

erly.

The

mechanism

mode

switch

con-

tact

faulty.

No.

Problem

Main

Possible

Cause

The

power

forcibly

turned

off

with

the

mechanism

its

current

position.

The

mechanism

becomes

(RE-

VIEW)

while

moving

from

(IDLER),

(STILL),

(BRAKE),

and

(STOP).

The

mechanism

becomes

(INITIAL)

while

moving

from

(REVIEW),

(IDLER),

(STILL),

(BRAKE),

and

(STOP).

Carries

out

tape

take-up

operations,

shifts

the

INITIAL

mode,

and

the

power

goes

off.

The

mechanism

mode

switch

con-

tact

faulty.

Note:

For

details

mechanism

operations

corresponding

the

mechanism

positions

the

self-diagnosis

numbers

and

above,

refer

the

separate

volume

the

V95

mechanism

manual.

These

manual

reference

numbers

are

shown

the

cover.

Mechanism

Mode

Display

Contents

Mechanism

Mode

Mechanism

Mode

No.

Mechanism

Mode

No.

CASSETTE

OUT

PLAY

VIDEO

INSERT

STANDBY

REC

VIDEO

INSERT-PAUSE

STOP

AUDIO

DUBBING

AUDIO/VIDEO

INSERT

STILL

SPEED

PLAY

REVERSE

SPEED

PLAY

REC-PAUSE

CUE

AUDIO

DUBBING-PAUSE

REVIEW

FAST

FORWARD

REWIND

FRAME

ADVANCE

SLOW

OTHERS

Head

Output

Drop

Warning

Display

When

the

STOP

button

the

remote

control

pressed

for

seconds

continuously

seconds

after

play

starts,

"L"

will

displayed

blinking

the

first

digit

the

minutes

position

the

tape

counter

when

the

head

output

lower

than

the

specified

value

indicate

abnormality.

The

cause

the

abnormality

may

due

drop

the

playback

output

caused

drop

the

efficiency

the

cassette

used

head

clogging.

Refer

"Head

Playback

Output

Voltage

Check"

means

judge

the

abnormality.

Display

panel

Head

output

drop

warning

display

(Tape

counter

“1st

digit

Minutes."

position)

=36

Head

playback

output

voltage

check

Cassette

Used

Cassette

with

normal

playback

output

Recorded

cassette

(with

tabs)

Rental

cassette

(without

tabs)

Warning

Display

Envelope

Detection

Output

Voltage

Envelope

detec-

tion

output

(IC301

R3032

Mark

side:

see

Fig.

2-1-1)

Switching

pulse

(TP

183:

see

Fig.

2-1-2)

Envelope

detec-

tion

output

(iC301

R3032

Mark

side:

see

Fig.

2-1-1)

Switching

pulse

(TP183:

see

Fig.

2-1-2)

Envelope

detec-

tion

output

(IC301

R3032

Mark

side:

see

Fig.

2-1-1)

Switching

pulse

(TP183:

see

Fig.

2-1-2)

Envelope

detec-

tion

output

(IC301

R3032

Mark

side:

see

Fig.

2-1-1)

Switching

pulse

(TP

183:

see

Fig.

2-1-2)

f__

0.5~0.95V

=¥

than

0.95V

Less

than

0.5V

Main

Cause

When

the

output

voltage

differ-

ence

the

two

channels

0.5

0.95V

The

video

heads

both

are

normal

When

the

output

voltage

differ-

ence

the

two

channels

than

0.95V

Tracking

adjustment

has

not

been

performed

accurately

‘e

One

video

head

clogged

One

video

head

has

worn

out

When

the

average

output

volt-

age

the

two

channels

less

than

0.5V

Tracking

adjustment

has

not

been

performed

accurately

Both

video

heads

are

clogged

Both

video

heads

have

worn

out

When

the

output

voitage

dif-

ference

the

two

channels

than

0.95V

Tracking

adjustment

has

not

been

performed

accurately

One

video

head

clogged

One

video

head

has

worn

out

Some

rental

cassettes

may

have

extremely

low

video

playback

outputs

even

when

both

video

heads

are

normal.

the

average

output

voltage

the

two

heads

may

less

than

0.5V

for

some,

warning

displays

will

shown.

Cylinder

rotation

accumulated

time

display

Press

the

STOP

button

the

remote

control

for

approximately

seconds

and

the

cylinder

rotation

accumulated

time

excluding

the

cassette

out

and

standby

operation

time

will

displayed

the

"Hours"

display

units

100

hours.

("33"

will

displayed

for

seconds

for

3,200

3,299

hours.)

erase

the

cylinder

rotation

accumulated

time

display,

press

the

RESET

button

the

remote

control

during

the

accumulated

time

display.

Display

panel

Cylinder

rotation

accumulated

display

(Tape

counter

"Hours"

display)

DISASSEMBLY

1-1.

REMOVAL

CABINET,

MECHANISM

UNIT,

AND

MAIN

BOARD

REMOVING

THE

CABINET

PARTS

(Fig.

1-1-1)

Remove

the

cabinet

and

bottom

cover

removing

the

four

screws

(1)

and

four

screws

@).

Remove

the

front

panel

removing

the

locks

the

clamps

(A)

using

screwdriver,

etc.

and

slightly

rotating

the

bottom

part

the

direction

the

arrow.

Notes:

Electrical

adjustments

for

the

this

model

can

performed

with

only

the

cabinet

removed.

When

replacing

the

bottom

cover,

not

tighten

the

screws

too

much.

Excess

tightness

may

damage

the

screws

taps

the

chassis.

REMOVING

THE

MECHANISM

MAIN

UNIT

AND

THE

CP-1

PWB

ASSEMBLY

(Fig.

1-1-2

and

1-1-3)

After

removing

the

cabinet

parts,

remove.the

mechanism

unit

and

the

CP-1

PWB

assembly

connected

follows.

M-MP2N/G-1

Clamps(A)

Front

Panel

Spread

out

the

lock

clamps

(C)

the

arrow

direction

slightly

and

remove

the

TM-1

PWB

shown

Fig.

1-1-2.

Remove

the

screw

the

chassis.

Remove

the

screw

©)

the

chassis,

the

screw

©,

and

the

holder

this

order.

Remove

the

two

screws

and

two

screws

the

mechanism

unit.

The

two

screws

(8)

the

cassette

tray

can

removed

easily

pushing

the

tray

lock

lever

the

arrow

direction

remove

the

lock

shown

the

enlarge

view

and

pushing

the

lid

opener

lever

the

arrow

direction

remove

the

lock

shown

the

enlarge

view

Lift

the

whole

mechanism

unit

and

main

board

(CP-1

PWB

assembly),

and

shown

Fig.

1-1-3,

push

the

two

lock

clamps

(D)

the

chassis

the

arrow

direction

that

they

can

removed

from

the

chassis.

Cabinet

Main

Unit

Bottom

Cover

Fig,

1-1-1

Fig.

1-1-2

1-2.

TEMPORARILY

SETTING

AND

CONNECTING

CP-1

PWB

ASSEMBLY

The

following

example

how

place

and

connect

the

main

board

without

jig,

when

repairing

the

CP-1

PWB

assembly.

Place

the

mechanism

unit

and

main

board

side

down

Operete

the

unit

using

the

buttons

TM-1

PWB

the

whole

flat

surface

with

foil

side

the

main

board

remote

control.

facing

up.

M-PF2LN/TA-4

CP-1

PWB

Assembly

(Foil

side)

Terminal

Boord

TM-1

PWB

Cassette

Compartment

Mechanism

Main

Unit

1-3.

INSTALLATION

THE

FRONT

PANEL

When

installing

the

front

panel

the

chassis

after

repaires

and

adjustments.

Pressing

down

the

door

opener

lever

the

mechanism

Note:

Opened

cassette

door

position

does

not

install

the

front

main

unit.

panel

the

chassis.

Set

the

cassette

door

half-opened

state

shown

Fig.

1-1-5,

and

install

the

front

panel

the

chassis.

M-MA4/U-5

Jutted

part

Cassette

Holder

Front

Panel

Cassette

Door

(Position

Cassette

Door

(Position

Fig.

1-1-5

1-4.

CIRCUIT

BOARD

LOCATIONS

L-MP4H/G3,

SP2

VHR-757G,

VHR-757EX,

VHR-757NL

Tuner

(Tuner/IF/RF

Conv.)

TN-3

PWB

for

VHR-757G

VHR-757NL

TN-5

PWB

for

VHR-757EX

TM-1

PWB

VHR-777EV,

VHR-777EX,

VHR-797SP

Tuner

(Tuner/IF/RF

Conv.)

AD-5

PWB

for

VHR-797SP

TN-3

PWB

for

VHR-777EV

TN-5

PWB

for

VHR-777EX

TN-6

PWB

for

VHR-797SP

TB-2

PWB

for

VHR-797SP

VP-1

PWB

Assembly

CP-1

PWB

Assembly

TM-8

PWB

for

VHR-757G

TM-9

PWB

for

VHR-757EX

VHR-757NL

VP-1

PWB

Assembly

CP-1

PWB

Assembly

)

ELECTRICAL

ADJUSTMENT

VCR

PRESETTING

This

VCR

need

three

basic

presetting

using

the

menus

displayed

on-screen.

After

all

connection

have

been

made,

then

steps

preset

the

VCR.

The

three

presetting

steps

will

displayed

sequence

screen.

The

setting

are

entered

with

the

remote

control.

Turn

the

VCR

Adjusting

the

receiver

the

video

channel:

The

AUTO

SETUP

screen

will

appear.

When

the

video

channel

has

been

preset,

press

the

button

the

remote

control.

Country

selection:

Using

the

numeric

button,

select

the

country

use.

Language

selection:

When

the

desired

language

has

been

select,

press

the

MENU/TV

button

directly

before

prevent

auto

tuning

will

start.

When

steps

have

been

finish,

ready

operate

the

all

operating

mode.

2-1.

SERVO

CIRCUIT

ADJUSTMENT

These

adjustments

should

done

upon

completion

the

tape

transport

adjustments.

the

tape

transport

adjustments

(except

the

tilt

adjustment)

are

done

after

these

adjustments,

the

procedures

again

section

2-1-3,

"Switching

position

adj."

When

cassette

tape

loaded,

auto-tracking

will

set

immediately

after

starting

the

first

playback.

this

will

daviate

the

tracking

center

set,

sure

press

the

channel

buttons

(++)

and

(—)

once

directly

after

starting

playback

prevent

auto-tracking

from

being

set.

2-1-1.

TEST

EQUIPMENT

AND

STANDARDS

REQUIRED

Oscilloscope

Vertical

sensitivity

mV/DIV,

external

trigger

Bandwidth

than

MHz

Alignment

Tape

VHJ-0009

VHJ-0023

mode,

monoscope,

KHz

Blank

Tape

VHS-type

cassette

tape

Monitor

2-1-2.

LOCATION

ADJUSTMENT

POINTS

P12000B

CP-1

PWB

(Foil

side)

Fig.

2-1-1

P66300D

TP183.-

TP182

(SW-P)

(ENV.

©®

VP-1

PWB

Assembly

Fig.

2-1-2

2-1-3.

SWITCHING

POSITION

ADJ.

[Measuring

Point

Measuring

Equipment

Adj.

Condition

TP101

PLAY

(SP)

mode

(VIDEO

OUT)

Alignment

tape

TP183

(SW-P)

(VHJ-0009

VHJ-0023)

Adj.

Value

6.5H+0.5H

Play

back

the

alignment

tape.

Set

the

tracking

control

position

the

center

pressing

CHANNEL

buttons

(++)

and

(—)

simultaneously.

Adjust

VR351

(SW-P)

that

the

width

"T”

becomes

6.5

0.5

shown

Fig.

2-1-3.

Oscilloscope

Adj.

Location

VR351

(SW-P)

WS-SWP

T=6.5H

£0.5H

nine

Front

edge

vertical

sync

signal

Rise

RF.SW.PULSE

Fig.

2-1-3

~10-

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