Toshiba Sr-f770 User manual

-F770

|

AS

adaptor

Platter

sheet

Turntable

cabinet

Spindle

Platter

Stroboscope

lamp-

,

1.

OPERATING

INSTRUCTIONS

Head

shell

stand

Auto-return

adjustment

screw

Auto-start

adjustment

screw

Counter

weight

Tracking

force

scale

Tonearm

Anti-skating

mechanism

Arm

rest

lock

Arm

rest

Auto

repeat

knob

Speed

/

size

selector

Cue

lever

Starter

lever

(AUTO

START,

AUTO

CUT)

Pitch

control

knob

Arm

lifter

Head

shell

Figure

1.

2.

TROUBLE

SHOOTING

(MOTOR

P.C.

BOARD)

O

+

\

Waveform

at

(A)

a

o

=2

;

aS

Fen

eatis

)

22s

1D

LD

ee

s

am

we

©

~~

O

oe

NG

=o

ae

m

ee

\\\

M

ine)

~,

ee

nm

\\\

No

‘

NM

:

aE:

ZS

<°

2

|Olo

,

N<

a4

Ji

L/P

Sore

Sh

mln

OJ

~N

x

|

]

O

onan

—

fo

>

Z

Alb

O¢Y

Ge/lb

L19

ae

Ale

924

Waveform

at

©)

oY

|

:

Figure

2.

des

OE

as

SWITCH

ON

Yes

Check

if

voltage

at

@)

is

5.1V

Abnormal

revolution

No

Failure

of

Zener

Diode

RDO1

Failure

of

soldering

SR—F770

SR-—F770

Burn-out

of

sensor

winding

(refer

to

wave-

form

at

©

)

Failure

of

transistor

Q01,

Q02,

Q03,

Q04,

O05

and

Q06

(refer

to

waveform

at

©)

)

Burn-out

of

driving

winding

and

failure

of

soldering

(refer

to

waveform

at

©)

)

Slow

revolution

failure

of

speed

VR.

Burn-out

of

genertor

winding

and

failure

of

soldering

(refer

to

waveform

at

©

)

Rare

short-circuit

of

generator

winding

(refer

to

waveform

at

©

)

Fast

revolution

Failure

of

rectifing

diode

DO01,

DO2

and

DO3

(refer

to

waveform

at

©

)

Malfunction

of

speed

VR

Burn-out

of

generator

winding

and

failure

of

soldering

(refer

to

waveform

at

©

)

Failure

of

transistor

O08

and

QO09

Failure

of

rectifing

diode

D0O1,

DO2

and

DO3

(refer

to

waveform

at

©

)

Approx.

2.0

mA

is

charged

to

motor

Failure

of

transistor

Q08

and

Q09

Failure

of

soldering

of

COM

wire

of

driving

winding

Yes

Check

if

oscillator

operates

Yes

No

revolution

Check

if

voltage

at

VES

Gis

BAV

No

Check

if

voltage

at

circuit

power

terminal

is

18V

Rare

short-circuit

of

driving

winding

(voltage

drop

due

to

overcurrent)

No-4

Disorder

of

power

sorce

Break

of

pattern

on

soldering

of

lapping

normally

Approx.

350

mA

is

charged

to

motor

Burn-out

of

sensor

and

failure

of

soldering

Failure

of

Zener

diode

DO1

and

of

soldering

Failure

of

transistor

Q01,

Q02, 003,

Q04,

Q05

and

Q06

Burn-out

of

driving

winding

and

failure

of

soldering

Oscillator

coil

LO1

Mylar

capacitor

CO7

and

C08

Transistor

QO7

Disorder

of

D

and

failure

of

No

soldering

(refer

to

waveform

at

©

)

tel

rer

EE

LL

LLL

L—

DS

|S

Waveform

at

rectifing)

TGPeF

S\S

NIM

Waveform

at

©

(Waveform

between

emitter

and

collector

of

switching

transistor)

_—

Waveform

at

©

AT

las

Be

ae

ie

.5V

Waveforms

shown

below

are

observed

by

syncroscope

on

each

point

(Normal

waveform)

Waveform

at

©

(generating

waveform

after

/\n/

\S\n

300

mV

(Normal

waveform)

(Failure

of

rectifing

diode

of

one

phase

disconnection)

(Failure

of

soldering

of

generator

winding

(Abnormality

of

contro!

circuit)

(Normal

waveform)

(Burn-out

of

sensor

winding

and

failure

of

soldering)

(Normal

waveform)

(Failure

of

driving

winding

or

power

transistor)

(Failure

of

power

transistor)

ce

tabune

MOEN

Oe

ieee

RESUS

hn

|

SR—-F770

SR—F770

|

TRACKING

FORCE

ADJUSTMENT

AUTO-START

POSITION

ADJUSTMENT

(Note:

this

adjustment

is

important)

The

distance

between

styius

tip

and

record

surface

when

the

cue

lever

is

in

the

“‘UP”’

position,

is

adjusted

by

means

of

the

height

adjustment

screw

on

the

tonearm

pivot

(this

task

will

require

a

small

screw

driver).

Reference

line

®

Turning

in

the

clockwise

direction

will

lower

the

stylus.

@

Turning

in

the

counter

clockwise

direction

will

raise

the

stylus.

Anti-skating

mechanism

Figure

6,

F

e4)

Tapping

Screws

(WRUD)

If

the

turntable

has

already

been

connected

to

an

amplifier,

3.196

x

16

mm

be

sure

to

switch

the

amplifier’s

power

supply

off

before

ap

commencing

this

adjustment.

eS

Figure

3.

Figure

8.

(1)

First

remove

the

stylus

cover.

(2)

Check

that

the

cue

lever

is

in

the

“DOWN”

position,

STYLUS

HEIGHT

ADJUSTMENT

and

that

the

tonearm

itself

is

free

to

move

from

the

®

When

stylus

lands

too

close

to

the

outer

edge

of

the

arm

rest.

seaaiel

4.

ADJUSTMENTS

(3)

Set

the

anti-skating

mechanism

to

read

“0”.

Turn

the

auto-start

adjustment

screw

in

the

counter

|

(4)

Now

carefully

screw

the

counter

weight

out

back-

clockwise

direction.

ADJUSTMENT

OF

SEMI-FIXED

RESISTOR

(VR33

and

VR45)

wards

until

the

tonearm

is

perfectiy

balanced

in

a

®

When

stylus

lands

inside

the

first

track

Turn

the

auto-start

adjustment

screw

in

the

counter

clockwise

direction.

horizontal

plane.

Then

keeping

the

counter

weight

still,

turn

the

tracking

force

scale

only

to

align

the

“O”’’

with

the

reference

line.

1.

Adjust

pitch

control

knob

to

mechanical

center.

2.

Adjust

the

semi-fixed

resistor

(VR33

or

VR45)

so

that

the

strobscope

stops.

(5)

the

counter

weight

together

with

the

tracking

force

scale

so

that

the

scale

reading

corres-

1.

Connect

syncroscope

to

©

of

sohematic

diagram

(refer

to

figure

2)

ponds

with

the

tracking

force

rating

specitied

for

volir

cartridaa

yo

,

oe

ee

ae

sdipetdl

at

Nisan

a

ADJUSTMENT

OF

OSCILLATOR

COIL

(L01)

2.

Adjust

oscillator

coil

(LO1)

so

that

the

waveform

at

©

is

as

figure

below.

(6)

Return

the

tonearm

to

the

arm

rest.

(7)

Also

adjust

the

anti-skating

mechanism

to

the

same

value

as

the

tracking

force.

LN

L\

2

J\.f

300

uv

D

¢

was

wi

A

LF

hi

OP

sare

ees

FI

Adjust

the

platter’s

rotational

speeds

to

exactly

33

and

45

rpm

by

means

of

the

speed

control

Knob

and

the

stroboscope.

When

the

relevant

stresoscone

mar

icings

sdidetncae

ccaw

Figure

9.

appear

to

be

stationary,

the

platter

will

be

rotating

at

the

correct

speed.

The

speed

may

be

increased

by

turning

the

speed

control

knob

in

the

F

(faster)

direction,

and

decreased

by

turning

in

the

S

(slower)

direction.

AUTO-RETURN

POSITION

ADJUSTMENT

®

When

the

tonearm

returns

to

the

arm

rest

before

the

end

of

the

record

Se

Turn

the

auto

return

adjustment

screw

in

the

counter

eG

clockwise

direction.

@

When

the

tonearm

fails

to

return

to

the

arm

rest

after

LATTER

SPEED

ADJUSTMENT

ed

Atito

return

ry

9

Net

et

OE

adjustment

screw

Figure

4.

OVERHANG

ADJUSTMENT

When

repalacing

a

cartridge,

it

will

be

necessary

to

adjust

for

overhang.

As

has

been

indicated

in

Fig.

5,

the

distance

from

the

stylus

tip

to

the

point

of

connection

to

the

tonearm

is

exactly

50mm.

When

mounting

the

new

cartridge,

this

distance

is

adjusted

by

means

of

the

screw

|

«Ome

which

holds

the

cartridge

in

place

in

the

head

shell.

_

the

stylus

has

entered

the

lead-out

groove

\

|

.

Turn

the

auto

return

adjustment

screw

in

the

clockwise

;

:

A

es

ese

een

direction.

Figure

5.

==

ee

:

Stroboscope

lamp

A

:

Figure

7.

SR—F770

<

aa

oO

=

iATIC

a

=

O

ND

©

F239

a4

BELVSZ2

i2pasz

(0poU0))S21/10°0

(09|sawy)

091/100

Oks

|

=|

|

YOJIMS

O91

iS

190}8S

PaadS

40f

YOJIMS

OJIN

ZS

2

GveVSe

EEL

VSe

J8M0q

10}

YOPIMS

O19IW

(2/1)

MS!

Re

ee)

p10)

JaMod

———

Vk

VAA

mater

eeneaprnretmattitnet

i

en

NUa

Nug

Cj

dw]

UOaN

Id

Seas

|

WA

5

Sot

“SALON

3A

Ae

LUA

Rome

ee

eee

10

,0\N

.'N

é

914

;

We

—4

49°C

nag

os

Panes

seu

YOU

0s/z'2

Sid

at

026

Ley

4,

4

862VS¢

cea

600

é

19

OAT

REREAD

~

|

ogz

024

as

AL2

7

9¢8

M12

eal

|

pata

epabge

|,

3°508

PRE

LAGI

j

een

2ly

4h

128

Gz/e2"*019

:

+

YOLIMS

O191

WJ

JaW4OJSUDI]

J8MOd

lek

940

RED

NUG

18

eee

Qau

an

ss

1O}SISIY

ajGDIOA

Lun

Figure

11.

|

SR—F770

|

7.

MECHANICAL

AND

CABINET

PARTS

LOCATIONS

8.

PARTS

LIST

57

25771934

|

Spring

25773326

|

Spring

20727037

|

Gear,

Main

25773409

|

Spring,

Brake

20753199

|

Latch

20753200

|

Latch

20753224

|

Cam,

Start/Stop

20753225

|

Cam,

Cueing

20753226

|

Slider,

Repeat

20753229

|

Slider,

Stop

20753255

|

Lever,

Select

20753261

|

Lever,

Select

MECHANICAL

AND

CABINET

PARTS

20753216

20753215

20881160

2086

1060

20847138

20971046

20842131

20842130

20826204

20778136

Lever,

Lead-in

Lever,

Cam

Cushion,

Player

Cover

Hinge,

Player

Cover

Ass’y,

Player

Adaptor

Insulator,

Back

Insulator,

Front

Board,

Bottom

Case,

Bottom

Board

20723059

|

Turntable

20753262

|

Cam,

Select

20723061

|

Sheet,

Table

20763218

|

Cam,

Control

20736044

|

Head

Sheel

20763220

|

Rod,

Cueing

20746225

|

Spacer

20746202

|

Bracket,

Cue

Lever

20746250

|

Spacer

20773077

|

Ball,

Steel,

1/8”

20778132

20778138

20778140

Decoration

Plate,

Tonearm

Cover,

Main

Gear

Cover

Ass’y,

Operation

25771902

|

Spring

25773332

|

Spring,

Cueing

25774514

|

Spring,

Control

20791094

|

Washer,

3.3¢

20746227

|

Plate,

Friction

20798033

|

Ring,

3¢

20753212

|

Lever,

Lead-in

20871320

|

Knob,

Start

20753213

|

Lever,

Repeat

20871321

|

Knob,

Select

25772456

|

Spring

20871322

20877264

20877265

22184191

22707305

22/07334

22950592

20776061

20743073

20743075

20746204

20746232

20746233

20753201

20753266

20753204

20753205

20753219

20753236

20763217

Knob,

Pitch

Control

Nameplate

(America)

Nameplate

(Canada)

Clamp,

Cord

Screw,

49

x

10

mm

Screw,

39

x

14mm

Label,

Caution

Spacer,

Rubber

Cover,

Switch

Blook

Guide

Spacer,

Return

Lever

Stopper,

Rotor

Spacer

Lever,

Start

Switch

Lever,

Switch

Lock

Arm,

Micro

Switch

Lever,

Micro

Switch

Lever,

Relay

Cut

Lever,

Gear

Lock

Rod,

Start

Switch

25773325

|

Spring

20746203

|

Cushion

20753214

|

Lift

Block

22706007

|

Ring,

CS-8

22125329

|

Motor

Ass’y,

DD

20749084

|

Cover,

Lamp

20811321

|

Cabinet

Ass‘y

20746213

|

Spacer

20757026

|

Cam,

Adjust

20861081

|

Hinge,

Cabinet

22707376

|

Screw,

34

x

5mm

25735159

|

E

Washer,

1.5¢

25735222

|

E

Washer,

4¢,

Special

25771883

|

Spring

22707282

|

Screw

(BID),

36

x

10

mm,

Tapping

20753209

|

Latchet,

Repeat

20753210

|

Slider,

Lead-in

20753269

|

Rubber,

Brake

20788094

|

Weight

20763221

|

Rod,

Cut

20788095

|

Tonearm

Ass’y

20763260

|

Rod,

Size

Select

20788096

|

Base

Ass’y,

Tonearm

20796032

|

Nut,

4¢

20788097

|

Rest,

Tonearm

22705021

|

Rivet,

34

x

3.5mm

22707388

|

Screw,

36

x

8

mm,

Tonearm

Rest

25764399

|

Washer

22707381

|

Screw

(TRS),

46x

10mm

25771884

|

Spring,

Cueing

70433006

|

Screw

(BID),

36

x

6

mm

25771885

|

Spring

70433010

|

Screw

(BID),

3¢

x

10

mm

25771886

|

Spring

22701433

|

Screw

(BID),

36

x

25

mm

25776007

|

Spring

22707402

|

Screw

(BID),

4¢

x10

mm

Figure

12.

NOTE:

Parts

excluded

in

the

Parts

List

are

not

available

as

replacement

parts.

3

rack

©

(apes

Symbol

No.

71233008

|

Screw

(BID),

36

x

8mm,

T

Tapping

Screw

(BID),

36

x

16

mm,

Tapping

Screw

(BID),

34

x

20

mm,

Tapping

Screw

(WRUM),

3.19

x

13mm

Screw

(WRUM),

3.14

x

20mm

Screw

(TRS),

446

x

8mm

E

Washer,

2¢

E

Washer,

3¢

E

Washer,

4¢

71233016

71233020

22707400

22707401

22707003

22703117

22703118

74050040

TRANSISTOR

AND

DIODES

Transistor,

2SC1173-Y

D1

Diode,

151555V

BR

22115485

|

Rectifier,

WLO2M

DZ

Diode,

02Z218A

BOARD

SECTION

Transistor,

25A733-P

Transistor,

25D471-K

Transistor,

25C945-P

Thermistor,

SDT-100

Diode,

RD5.1E

22115340

|

Diode,

1$953

22114468

|

Transistor,

2SA798

ELECTRICAL

PARTS

22223240

|

Transformer,

Power

(America)

22223241

|

Transformer,

Power

(Canada)

22113437

|

Lamp,

Neon

22144390

|

Fuse,

0.5A4/125V

22146144

|

Switch,

Micro,

Power/Speed

Select

Cord,

Plug

(America)

Cord,

Plug

(Canada)

Cord,

Power

MOTOR

P.C.

BOARD

SECTION

CAPACITORS

+20%,

P

-0+100%,

Z

-20

+80%

22340073

|

Ceramic,

0.01mfd,

Z,

160V

(America)

22340103

|Ceramic,

0.01mfd,

P,

125V

(Canada)

22447100

|

Electrolytic,

10mfd,

35V

MOTOR

P.C.

22114316

22114729

22114589

22115519

22115518

a?

22164772

22164761

22176572

K

+10%,

M

C3

|

SR—F77(

|

Description

an

22440300

|

Electrolytic,

470mfd,

35V

MOTOR

P.C.

C01,

02,03

C04,

05,

06

CQ7

C08

CO9

C10

C11

C14,15

C17

R1

R2

RO1,

02,

03

R04,

05,

06

R10

R11,

12

R13

R14

R15

R17

R18

R19

R20

R21

R22

R23

R24

R25

R26

R27

R28

R29

R30

R31

he

All

resistors

are

1/4W,

+5%

carbon

film

unless

otherwise

noted.

K

+10%,

G

MOTOR

P.C.

BOARD

SECTION

Ceramic,

0.047mfd,

Z,

50V

Electrolytic,

10mfd,

25V

Mylar,

0.01mfd,

K,

50V

Ceramic,

0.0022mfd,

M,

50V

Electrolytic,

4.7mfd,

25V

Electrolytic,

22mfd,

35V

Electrolytic,

4.7/mfd,

25V

Electrolytic,

2.2mfd,

50V

Electrolytic,

4.7mfd,

25V

22342473

22446100

22372103

22343222

22446479

22447220

22446479

22448229

22446479

RESISTORS

+2%

22563153

|

15K

ohm,

D,

1/2W,

Carbon

Composition

1.2K

ohm

22545122

BOARD

SECTION

470

ohm

470

ohm

2.2

ohm

82K

ohm

120

ohm

390

ohm

47K

ohm

1.8K

ohm

1.5K

ohm

3.9K

ohm

750

ohm,

G

2.7K

ohm

27K

ohm

2.7K

ohm

100K

ohm

10K

ohm

5.6K

ohm

2.7K

ohm

820

ohm

100

ohm

3.9K

ohm

1.2K

ohm

5.6K

ohm

4.7K

ohm

1.5M

ohm

22555471

22555229

22555823

22555121

22555391

22555473

22555182

22555152

22555392

22550151

22555272

22555273

22555272

22555104

22555103

22555562

22555272

22555821

22555101

22555392

22555122

22555562

22555472

22555155

}

110K

ohm

|

920

ohm

15.1K

ohm

Symbol

No.|

Part

No.

Description

VARIABLE

RESISTORS

a

MOTOR

P.C.

BOARD

VR33,

45

22658318

|4.7K

ohm,

Semi-fixed

22902158

|Owner’s

Manual

22902159

|Owner’s

Manual

(Canada)

20971046

|Adaptor,

45

r.p.m.

22950799

|Label,

Caution

TOSHIBA

CORPORATION

2-1,

GINZA

S-CHOME,

CHUO-KU,

TOKYO

104,

JAPAN

PRINTED

IN

JAPAN

22955467

Nov.

1978

Ld

Teh

NT

Ment

Ta

Toshiba SR-F770 User manual

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