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THOMSON

Brandt

FERGUSON

SABA

TELEFUNKEN

THOMSON

VIDEO

Ae

|

Oo

=s2

SERVICE

MANUAL

DOCUMENTATION

TECHNIQUE

TECHNISCHE

DOKUMENTATION

Vi2

DOCUMENTAZIONE

TECNICA

DOCUMENTACION

TECNICA

Vi2

S1G

VSH2050G

Vi2

S2G

VSH2080G

THOMSON

AA

WARNING

:

Before

servicing

this

chassis

read

the

safety

recommendations.

|

ATTENTION

:

Avant

toute

intervention

sur

ce

chassis,

lire

les

recommandations

de

sécurité.

|

ACHTUNG

:

Vor

jedem

Eingriff

auf

diesem

Chassis,

die

Sicherheitsvorschriften

lesen.

|

ATTENZIONE

:

Prima

di

intervenire

sullo

chassis,

leggere

le

norme

di-sicurezza.

IMPORTANTE

:

Antes

de

cualquier

intervencin,

leer

las

recomendaciones

de

seguridad.

4

Ode

:

351

028

80

-

1199

/4,8M

-

V12

S1/2G

Print.

wcooeranioun-

ame

Son,

madcato

on

ot

use

autoid

Al

hts

resewed

ward.

©

Tous

cos

oe

eroduton

de

vadtion,

Cadet

a

exon

vee

pour

tous

Ws

pas.

*

Slide

Uebereie

an

dis

Teen

und

Zecmongen

sen

us

a.

Nechuce

auch

auszugsweisé~

rut

i

unserer

varerigon

Zusimmrung

zulissig,

Ale

Recle

vorbehalten.‘

didi

rnredwzione,

radon,

e

esecuzione

sano

rservali

per

uti

pars.

©

Derechos

de

reproduccion,

de

raduccion,

de

adaglacon

y

de

eecucion

reservados

para

dos

ls

paises.

GENERALS

POWER

POWER

CONSUMPTION

DIMENSIONS

WEIGHT

FORMAT

MAX.

RECORDING

TIME

ACCESSORIES

VIDEO/AUDIO

SIGNAL

SYSTEM

RECORDING

SYSTEM

SIGNAL-TO-NOISE

RATIO

HORIZONTAL

RESOLUTION

FREQUENCY

RANGE

INPUT/OUTPUT

TUNER/TIMER

TV

CHANNEL

STORAGE

CAPACITY

TUNING

SYSTEM

CHANNEL

COVERAGE

AERIAL

OUTPUT

MEMORY

BACKUP

TIME

SPECIFICATIONS

:

AC

220

-

240

V~,

50/60

Hz

:

Power

ON

:

24

W

Power

OFF

:

5,5

W

+

400

(W)

x

94

(H)

x

347

(D)

mm

:

4Kg

:

S-VHS/VHS

PAL

Standard

:

SP:

240

mn

with

E-240

video

cassette

LP:

480

mn

with

E-240

video

cassette

:

RF

cable,

infrared

remote

control

unit,

“R6”

battery

x

2.

:

PAL-type

colour

signal

and

CCIR

monochrome

signal,

625

lines

50

fields

:

DA4

(Double

Azimuth)

head

helical

scan

system

:

45dB

:

250

lines

(VHS)

400

lines

(S-VHS)

:

70

Hz

to

10,000

Hz

(Normal

audio)

20

Hz

to

20,000

Hz

(Hi-Fi

audio)

:

21-pin

SCART

connectors:

IN/OUT

x

1,

IN/DECODER

x

1

RCA

connectors:

VSH

2080

AUDIO

IN/OUT

x 1,

VIDEO

IN

x

1

VSH

2050

AUDIO

IN/OUT

x

1

S-Video

connectors:

IN/OUT

x

1

:

99

positions

(+

AUX

position)

:

Frequency

synthesized

tuner

:

VHF

47

-

89/104

-

300/302

-

470

MHz

UHF

470

-

862

MHz

:

UHF

channels

22

-

69

(Adjustable)

:

VSH

2080

Approx.

60

mn.

VSH

2050

Approx.

10

mn.

34

3.1.1

3.1.2

3.1.3

3.2

3.24

3.2.2

3.3

3.3.1

3.3.2

3.3.3

3.3.4

3.3.5

3.3.6

3.3.7

3.4

3.4.1

3.5

3.5.1

3.6

3.6.1

44

4.2

43

44

45

46

47

Pages

ELECTRICAL

ADJUSTMENT

PRECAUTION

...

Required

test

equipment

Required

adjustment

tools

Colour

bar

signal,

colour

bar

pattern

.

SERVO

CIRCUIT

PB

switching

point

Slow

tracking

preset

VIDEO

CIRCUIT...

EE

Y

level...

SP/LP

REC

colour

level

PB

Y

level

(S-VHS/VHS)

S-VHS

VIDEO

EQ

D/A

level

Pilot

burst

level

....

Auto

picture

.....

AUDIO

CIRCUIT.

REC

FM

level

SYSCON

CIRCUIT...

Timer

clock

......

ON

SCREEN

CIRCUIT.

Character

position

CHARTS

AND

DIAGRAMS

NOTES

OF

SCHEMATIC

DIAGRAM...

CIRCUIT

BOARD

NOTES...

BOARD

INTERCONNECTIONS

...

VIDEO/N.AUDIO

SCHEMATIC

DIAGRAM

.

ON

SCREEN

SCHEMATIC

DIAGRAM

.....

FMA

SCHEMATIC

DIAGRAM...

SYSTEM

CONTROL.

SCHEMATIC

DIAGRAM.

SWITCHING

REGULATORs

SCHEMATIC

DIAGRAM..

TUNER

SCHEMATIC

DIAGRAM

48

49

4.10

4.13

4.14

4.15

4.16

417

4.18

4.19

4.20

4.21

4.22

4.23

4.24

4.25

4.26

4.27

4.28

4.29

4.30

4.31

C.BOX

CTL

SCHEMATIC

DIAGRAM......

TERMINAL

(MAIN)

SCHEMATIC

DIAGRAM

MAIN,

A/C

HEAD

AND

LOADING

MOTOR

CIRCUIT

BOARDS.....

3D

SVHS(VIDEO)

SCHEMATIC

DIAGRAM

(VSH

2080)

....sascesse

33

2D

SVHS(VIDEO)

SCHEMATIC

DIAGRAM

(VSH

2050)

2D

SVHS(2D

Y/C)

SCHEMATIC

DIAGRAM

(VSH

2050)

3D

SVHS(3D/TBC)

SCHEMATIC

DIAGRAM

(VSH

2080)

2D

SVHS

CIRCUIT

BOARD

(VSH

2050)

3D

SVHS

CIRCUIT

BOARD

(VSH

2080)

TERMINAL

SCHEMATIC

DIAGRAM

TERMINAL

CIRCUIT

BOARD...

DEMODULATOR

SCHEMATIC

DIAGRAM..........53

DEMODULATOR

CIRCUIT

BOARD...

SWITCH/DISPLAY,

REC

SAFETY,

JACK

AND JOG

SCHEMATIC

DIAGRAMS

SWITCH/DISPLAY,

REC

SAFETY,

JACK

AND JOG

CIRCUIT

BOARDS...

FDP

GRID

ASSIGNMENT

AND

ANODE

CONNECTION

(VSH

2080)

FDP

GRID

ASSIGNMENT

AND

ANODE

CONNECTION

(VSH

2050)

VOLTAGE

CHARTS

(VSH

2080)

.

VOLTAGE

CHARTS

(VSH

2050)

.

SYSTEM

CONTROL

BLOCK

DIAGRAM

VIDEO

BLOCK

DIAGRAM

(VSH

2080)

VIDEO

BLOCK

DIAGRAM

(VSH

2050)

AUDIO

BLOCK

DIAGRAM

(VSH

2080)

AUDIO

BLOCK

DIAGRAM

(VSH

2050)

~-SECTION

3

be

ELECTRICAL

ADJUSTMENT

-

z

3.1

PRECAUTION

Electrical

adjustment

are

required

after

replacing

circuit

com-

ponents

and

certain

mechanical

parts.

It

is

important

to

per-

form

these

adjustments

only

after

all

repairs

and

replacements

have

been

completed.

Aiso

do

not

attempt

these

adjustments

unless

the

proper

equipments

is

available.

-

3.1.1

Required

test

equipment

@

Colour

television

or

monitor

@

Oscilloscope:

wide-band,

dual-trace,

triggered

delayed

,

Sweep

@

Frequency

counter

@

Signal

generator:

RF/IF

sweep/marker

©

Signal

generator:

PAL

colour

bar,

stairstep

©

Recording

tape

(VHS

tape/S-VHS

tape)

@

Digit-key

remote

controller(provided)

3.1.2

Required

adjustment

tools

Alignment

tape(SP)

MHPE,

10405000

Presetting

unit

76000899

Alignment

tape

{S-VHS,

SP/LP,

colour

bar)

MH-2H

76000840

‘See

schematic

diagram

Fig.

3-3-4

page

5

3.1.3

Colour

bar

signal,colour

bar

pattern

@

PAL

colour

bar

signal

White(100%)

ecS

White(75%)

3

gi

8

5

58

|

\

PAE

s

o7V

&

Burst

w

|

/

}

Ht

03V

03V

i

v

U

Horizontal

vR-Y)

syne

U(B-Y)

Fig.3-1-1

PAL

colour

bar

signal

waveform

@

PAL

colour

bar

pattern

@|

=z

«|

#

=),

S/s]-8]}

5/3)

8

—€/3;s)/8|

8/2]

2

>

oO

s

(75%)

—t=

viu

wis.

Black

Fig.3-1-2

PAL

colour

bar

pattern

3.2

SERVO

CIRCUIT

Notes:

+

Uniess

otherwise

specified,all

measurement

points

and

adjustment

parts

are

located

on

the

MAIN

BOARD.

+

Set

the

VCR

to

the

mode

A

by

the

remote

con-

troller.

Note:

The

system

control

circuit

of

this

model

has

an

automatic

recognition

about

the

ON-OFF

control

of

the

DOCTOR

SYSTEM.

3.2.1

PB

switching

point

Signal

*

Alignment

tape

[MHPE],

Stairstep

V.

syne

Measurement

point

|)

*

VIDEO

OUT

TERMINAL

Trigger

slope

(-)

©TP111(D.FF)

Adjustment

tool

*Presetting

unit

76000899

8.0

+

0.5H

[MHPE]

°7.5

+

0.5H

[MHP}

Specification

Note:

+

Use

only

the

“E”

and

“F”

buttons,

depressing

other

buttons

during

adjustment

may

cause

ad-

justment

errors.

VSH

2080

(1)

Playback

the

stairstep

signal

of

the

alignment

tape

{MHPE]

;

(2)

Connect

an

oscilloscope

to

VIDEO

OUT

TERMINAL

and

TP111

(negative

slope),

and

then

observe

VIDEO

OUT

TERMINAL.

(3)

Adjust

by

pressing

the

“E”

or

“F”

buttons

of

the

preset-

ting

unit

so

that

the

switching

point

becomes

8.0

+

0.5H

from

V.sync.

(4)

Depress

the

STOP

button.

(5)

Playback

the

stairstep

signal

of

the

alignment

tape[MHP].

(6)

Adjust

by

pressing

the

“E"

or

“F”

buttons

of

the

preset-

ting

unit

so

that

the

switching

point

becomes

7.5

+

0.5H

from

V.sync.

(7)

Depress

the

STOP

button.

Note:

+

Use

only

the

“O”

button,

depressing

other

but-

tons

during

adjustment

may

cause

adjustment

errors.

VSH

2050

(1)

Playback

the

stairstep

signal

of

the

alignment

tape

(2)

Connect

an

oscilloscope

to’

VIDEO

OUT

TERMINAL

and

TP111

(negative

slope},

and

then

observe

VIDEO

OUT

TERMINAL.

(3)

Press

the

“O”

button

of.the

presetting

unit.

(4)

The

adjustment

is

performed

automatically.

Once

the

adjustment

is

performed,

the

VCR

will

go

into

the

STOP

mode.

(5)

Playback

the

alignment

tape

again,

confirm

the

switch-

ing

point

(See

Fig.

3-2-2).

VSH

2050

VSH

2080

Fig.

3-2-1

Presetting

unit

Switching

point

*

Alignment

tape

[MHP],

Stairstep

8.0

+

0.5H

(MHPE)

7.5

+

0.5H

(MHP)

Mode

PB

TBC

:

OFF

Equipment

*

Oscilloscope

V.

rate

Fig.

3-2-2

PB

switching

point

3.2.2

Slow

tracking

preset

Signal

Tuner

or

colour

bar

Mode

eSP/LP:

REC

+

PB(SLOW)

°S-VHS

Equipment

¢TV-Monitor

Adjustment

tool

*Presetting

unit

76000899

Specification

Minimum

noise

Note:

-

Use

only

the

“B”

and

“C”

buttons,

depressing

other

buttons

during

adjustment

may

cause

ad-

justment

errors.

(1)

Record

a

colour

bar

signal

in

the

SP

mode.

(2)

Playback

the

recorded

signal

on

the

FWD

slow

mode.

(3)

Set

the

tracking

control

to

the

centre

position

by

simul-

taneously

pressing

the

CH

“+”

and

“—”

buttons.

(4)

Observe

the

display

on

the

TV

monitor

and

adjust

for

op-

timum

noise

condition

(best

tracking)

by

depressing

the

"B”

or

“C”

buttons

of

the

presetting

unit.

(5)

Depress

the

STOP

button.

(6)

Confirm

that

the

bar

noise

is

not

visible

on

the

TV

moni-

tor

in

the

slow

mode

(7)

Repeat

steps

(2)

to

(6)

in

the

REV

slow

mode.

(8)

Repeat

steps

(1)

to

{7)

in

the

LP

mode.

Fig.

3-2-3

Presetting

unit

3.3

VIDEO

CIRCUIT

Notes:

-

Unless

otherwise

specified,all

measurement

points

and

adjustment

parts

are

located

on

the

MAIN

BOARD.

+

VIDEO

circuit

adjustments

are

performed

by

the

EVR

system

by

use

of

the

presetting

unit

and

digit-key

remote

controller.

+

S-INPUT

means

Y/C

separated

video

signal

in

the

chart.

:

+

Set

the

VCR

to

the

mode

A

by

the

remote

con-

troller.

+

Unless

otherwise

specified,

set

the

VCR

to

the

following

mode.

B

OFF

PICTURE

CONTROL

||

NORMAL

TBC

ON

|

Fig.

3-3-1

Presetting

unit

FOP

EVR

MODE

Fig.

3-3-2

EVR

mode

3.3.1

EEY

level

Signal

*

Colour

bar

Mode

oEE

Equipment

*

Oscilloscope

Measurement

point

|}

*Y

OUT

TERMINAL

(75

ohm

TERMINATION)

*Presetting

unit

76000899

*

Digit-key

remote

controller

eA:11

Adjustment

tool

EVR

mode

Specification

*1.00

+

0.03

Vp-p

(terminated)

(1)

Connect

an

oscilloscope

to

Y

OUT

TERMINAL.

(2)

Set

the

EVR

mode

by

pressing

the

"K”

button

of

the

pre-

setting

unit.

{3)

Set

“A:

11”

by

twice

pressing

1

button

of

the

remote

controller.

(4)

Adjust

the

CH

“+”

or

“~"

buttons

for

1.00

+

0.03

Vp-p.

(See

Fig.

3-3-3.)

(5)

Set

the

normal

VCR

mode

by

pressing

the

“K"

button

of

the

presetting

unit

again

so

adjustment

data

is

memo-

rized.

Ly

qo

[

20

mV/div

H.

rate

{

|

1.00

+

0.03

Vp-p

20

usec

Fig.

3-3-3

EE

Y

level

3.3.2

SP/LP

REC

colour

level

x

150

+

5%(SP)

Measurement

point

|}

¢PB

COLOUR

eTP111

(D.FF)

*Presetting

unit

76000899

*

Digit-key

remote

controller

©

LPF

fixture

Trigger

slope

(-)

Adjustment

tool

EVR

mode

°A:2

°"B"

x

150

+

5%

:

SP

"BY

x

110+

5%

:

LP

Specification

Signal

Alignment

tape

[MH-2H]

Colour

bar

Mode

°PB

ut

REC

—

PB:

SP/LP

¢S-VHS

Equipment

*

Oscilloscope

“Bx

110

+

5%(LP)

5

mVidiv.

V.

rate

2

msec

Fig.

3-3-5

REC

colour

level

3.3.3

PB

Y

levei

(S-VHS/VHS)

Signal

*

Colour

bar

Mode

REC

~

PB:

SP

©

S-VHS/VHS,

Equipment

*

Oscilloscope

1kQ

30pH

180

pH

Vv.

PB

FM

from

TP106

PB

COLOUR

[

MAIN

board

]

(629

kHz)

120

pF

7

180

pF

Fig.

3-3-4

LPF

(1)

Connect

an

oscilloscope

to

PB

COLOUR

of

a

LPF

(refer

to

Fig.

3-3-4)

and

TP111

(negative

slope)

on

the

MAIN

board.

(2)

Playback

the

SP

colour

bar

signal

of

the

MH-2H

alignment

tape.

(3)

Adjust

by

pressing

the

CH

“+”

or

“-"

buttons

of

the

Front

panel

for

maximum

level

of

the

color

waveform

and

make

a

note

of

the

higher

colour

level

“B”.

(4)

Press

the

STOP/EJECT

button

and

eject

the

MH-2H

align-

ment

tape.

(5)

Set

the

EVR

mode

by

pressing

the

“K”

button

of

the

pre-

setting

unit.

(6)

Set

“A:

2”

by

pressing

2

button

of

the

remote

control-

ler.

(7)

Before

recording,

adjust

the

CH

“+”

or

“—"

buttons

of

the

remote

controller

so

that

the

higher

level

channel!

be-

comes

150

+

5%

:

SP

(110

+

5%

:

LP)

of

the‘note

“B”

level

during

playback

as

shown

in

Fig.

3-3-5.

(8)

Record

a

colour

bar

signal

in

the

SP

(LP)

mode,

and

play-

back

the

recorded

colour

bar

signal.

(9)

Set

the

normal

VCR

mode

by

pressing

the

“K”

button

again

so

adjustment

data

is

memorized.

=

Measurement

point

|]

*Y

OUT

TERMINAL.

(75

ohm

TERMINATION)

¢Presetting

unit

76000899

*

Digit-key

remote

controller

eAl

Adjustment

tool

EVR

mode

Specification

1.00

+

0.03

Vp-p

(terminated)

(1)

Connect

an

oscilloscope

to

Y

OUT

TERMINAL.

(2)

Set

the

EVR

mode

by

pressing

the

“K"

button

of

the

pre-

setting

unit.

(3)

Set

“A:

11”

by

twice

pressing

1

button

of

the

remote

controller.

:

(4)

Record

a

colour

bar

signal

in

the

S-VHS

mode,

and

play-

back

the

recorded

colour

bar

signal.

(5)

Adjust

the

CH

“+”

or

“—"

buttons

for

1.00

+

0.03

Vp-p

as

shown

in

Fig.

3-3-6.

(6)

Set

the

normal

VCR

mode

by

pressing

the

“K”

button

of

the

presetting

unit

again

so

adjustment

data

is

memo-

rized.

(7)

Repeat

steps

(1)

to

(6)

in

the

VHS

mode.

|

1.00

+

0.03

Vp-p

20

mVidiv

H.

rate

20

psec

Fig.

3-3-6

PB

Y

level

3.3.4

S-VHS

VIDEO

EQ

3.3.5

D/A

level

Signal

©

S

INPUT

Signal

Colour

bar

*Video

sweep

Mode

eEE

Mode

REC

—

PB

:

SP/LP

*S.VHS

*S-VHS

5

SOc

Picture

control

REC

:

Normal

_

quipment

ecMoscore.

c

PB:

Edit

Measurement

point

||

¢CN1003-3

pin

(Y

OUT)

Equipment

*

Oscilloscope

[sB.ob20:SVES

poard]

Measurement

point

|}

¢

Y

OUT

TERMINAL

(75

ohm

TERMINATION)

Trigger

slope

(-)

°TP111

(D.FF)

Adjustment

tool

Presetting

unit

76000899

*

Digit-key

remote

controller

EVR

mode

2A:3

Specification

°3.6

+

0.4

scale:

SP

°3.2

+

0.4

scale:

LP

(1)

Connect

an

oscilloscope

to

YOUT

TERMINAL

and

TP111

(negative

slope).

(2)

Record

a

video

sweep

signal

in

the

S-VHS

SP

mode,

then

play

it

back.

(3)

Set the

EVR

mode

by

pressing

the

“K"

button

of

the

pre-

setting

unit.

(4)

Set

“A:

3”

by

pressing

3

button

of

the

remote

control-

ler.

(5)

When

assuming

the

100

KHz

sweep

signal

marker

on

the

bigger

channel

is

four

scales

on

the

oscilloscope,

ad-

just

the

CH

“+”

or

“—"

buttons

on-the

front

panel

or

the

Digit-key

remote

controller

so

that

the

3

MHz

is

set

at

3.6

+

0.4

scale

(-1

+

1.0

dB)

while

observing

Y

OUT

of

the

S

output.

(See

Fig.

3-3-7.)

(6)

Set

the

normal

VCR

mode

by

pressing

the

"K”

button

of

the

presetting

unit

again

so

adjustment

data

is

memo-

rized.

(7)

Carry

out

the

step

(3)

and

(4)

in

the

S-VHS

LP

mode.

(8)

When

assuming

the

100

kHz

sweep

signal

marker

on

the

bigger

channel

is

four

scales

on

the

oscilloscope,

adjust

the

CH

“+"

or

“-"

buttons

on

the

front

panel

or

the

Digit-

key

remote

controller

so

that

the

3

MHz

is

set

at

3.2

+

0.4

scale

(-2

+

1.0

dB)

while

observing

Y

OUT

of

the

S

output.

(See

Fig.

3-3-7.)

Four

scale

100.KHz

+

MHZ

9

patie

3

MHz

|

5

MHz

Lu

a

1

V.

rate

SP

:3.6

+

0.4

div.

LP

:3.2+0.4

div.

Fig.

3-3-7

S-VHS

VIDEO

EQ

Adjustment

part

°VR

1201

(D/A

LEVEL)

VSH

2050

VR

1401

(D/A

LEVEL)

VSH

2080

Specification

(NOTE)}]

2.05

Vp-p

(REFERENCE

VALUE}

a

Connect

the

oscilloscope

to

the

CN1003-3

pin(Y

OUT)

3D

SVHS

or

2D

SVHS

board.

(2)

Confirm

the

Y

level

value

during

external

S

input.

(3)

Switch

the

input

signal

to

the

external

input,

then

adjust

the

VR

1401

on

the

3D

SVHS

board

or

the

VR

1201

on

the

2D

SVHS

board

so

that

the

Y

level

value

becomes

the

same

level

value

witch

was

confirmed

at

the

step

(2).

Note:

¢

The

adjusted

value

of

2.05

Vp-p

is

a

reference

value

which

should

be

obtained

during

external

S

input.

The

value

should

be

adjusted

to

the

one

which

was

confirmed

at

step

(2).

|

i 1

|

NM

j

H

|

H

2.05

Vp-p

-

(relerence

vaiue)

)

50

mV/div

H.

rate

20

psec

Fig.

3-3-8

D/A

LEVEL

3.3.6

Pilot

burst

level

Signal

©

Colour

bar

Mode

°EE

°S-VHS

Equipment

*

Oscilloscope

Measurement

point

|}

«TP1001

(FSC

PHASE)

[3D

or

2D

SVHS

board]

¢VR1002

(P.

BURST

LEVEL)

{3D

or

2D

SVHS

board]

°"B"

x

110

+

10%

Adjustment

part

Specification

(1)

Connect

the

oscilloscope

to

the

TP1001

(FSC

PHASE)

on

the

3D

or

2D

SVHS

board.

(2)

Load

an

S-VHS

tape

then

set

the

unit

to

the

S-VHS

EE

mode.

(3)

Adjust

the

VR

1002

of

the

3D

or

2D

SVHS

so

that

the

pilot

burst

level

becomes

"B"

x

110

+

10%

against

the

value

of

the

burst

level

"B".

“BPX

110:£10%

age

|

3.4

AUDIO

CIRCUIT

Notes:

+

Uniess

otherwise

specified,

alli

measurement

point

and

adjustment

parts

are

located

on

the

MAIN

BOARD.

«

This

adjustment

should

be

done

after

the

video

circuit

SP

and

LP

REC

colour

level

are

adjusted.

+

GND{Ground)

should

be

taken

from

the

tuner

board

shield.

3.4.1.

REC

FM

level

Fig.

3-3-9

PILOT

BURST

LEVEL

3.3.7

Auto

picture

*#AUX

*VIDEO

:

Colour

bar

*

AUDIO

:

No

signal

*REC

>

PB:

LP

*S-VHS

Signal

Mode

Signal

*Monoscope

Mode

*

REC

>

PB:

SP/LP

*SVHS:

Adjustment

tool

¢Presetting

unit

76000899

Specification

*STOP

mode

°B.E.S.T

:

OFF

Equipment

*

Oscilloscope

Measurement

point

©TP2253

(A.

PB

FM)

Trigger

slope

(

-)

TP111

(D.

FF)

(1)

Record

a

monoscope

signal

in

the

SP

mode.

(2)

Playback

the

recorded

signal.

(3)

Press

the “L"

button

of

the

presetting

unit

during

play-

back.

(4)

Confirm

that

the

VCR

will

go

into

the

STOP

mode.

(5)

Repeat

steps

(2) to

(4)

in

the

LP mode.

Fig.

3-3-10

Presetting

unit

*VR2251

(A.

REC.

FM)

*600

+

100

mVp-p

Adjustment

part

Specification

(1)

Connect

an

oscilloscope

to

TP2253.

(2)

Record-a

colour

bar

signal

without

an

audio

signal

in

the

S-VHS

LP

mode’

then

playback.

(3)

Adjust

VR2251

for

600

+

100

mVp-p

playback

level

of

higher

channel

level

before

recording.

(4)

Confirm

that

the

lower

channel

level

is

more

than

450

mVp-p.

1

i

More

than

|

600

+

100

450

mVp-p

mVp-p

i

i

50

mV/div

V.

rate

20

usec

Fig.

3-4-1

Audio

REC

FM

level

3.5

SYSCON

CIRCUIT

Notes:

+

Unless

otherwise

specified,all

measurement

points

and

adjustment

parts

are

located

on

the

MAIN

BOARD.

*

When

perform

this

adjustment,remove

the

MECHANISM

assembly.

3.5.1.

Timer

clock

Signal

No

signal

Mode

eEE

Equipment

*®

Frequency

counter

©

1C3001-PIN61

©

C3025

(TIMER

CLOCK)

©

1024.008

+

0.001

Hz

{976.5549

+

0.0010

psec.]

Measurement

point

Adjustment

part

Specification

(1)

Connect

the

frequency

counter

to

1C3001-PIN61.

{2)

Connect

the

short

wire

between

1C3001-PIN24

and

Vec(5V).

{3)

Short

the

leads

of

capacitor

C3026

once

in

order.

to

re-

set

(C3001.

(4)

Disconnect

the

short-wire

between

|C3001-PIN24

and

Vec

then

connect

it

again.

(5)

Adjust

C3025

trimmer

capacitor

so

that

the

output

from

1C3001-PIN61

falis

within

1024.008

+

0.001

Hz

(976.5549

+

0.0010

psec.)

range.

:

3.6

ON

SCREEN

CIRCUIT

@

Note:

¢

Set

the

VCR

to

the

mode

A

by

the

remote

con-

troller.

3.6.1

Character

position

Signal

No

signal

Mode

i@EE

Equipment

*TV-monitor

Adjustment

tool

*Presetting

unit

76000899

*

Digit-key

remote

controller

Specification

«Character

centre

Note:

¢

Use

only

the

“H”

button,

depressing

other

but-

tons

during

adjustment

may

cause

adjustment

errors.

(1)

Press

the

MENU

button

and

display

the

on

screen

char-

6

acter.

(2)

Observe

the

TV-monitor

and

centre

position

of

charac-

ter

by

pressing

the

“H”

button

of

the

presetting

unit

Fig.

3-6-1

Presetting

unit

ee