Sony TC-765 User manual

GENERAL

Power

Requirements:

Power

Consumption:

AC

Outlet:

Dimensions:

Weight:

Track:

Tape

Speed:

SPECIFICATIONS

Fast

Forward

and

120V

ac,

GOHz

(US,

Canadian

model}

Rewind

Time:

110V,

120V,

220V,

240V

ac,

50/60

Hz

(UK,

AEP,

PX

model)

110W

(US,

Canadian

modei)

Q9OW

(UK,

AEP

model)

80W

(PX

model)

Recording

Time:

300W,

unswitched

(US,

Canadian

model)

Heads:

Approx.

445

(w)

x

525

(h)

x

235

(d)

mm

17

1/2

(w)

x

205/

(h)

x

91/4

(d)

inches

Motors:

including

projecting

parts

and

controls

26.5

kg,

58

!b

7

oz

(US,

Canadian

model)

Reel:

27

kg,

58

1b

8

oz

(UK,

AEP,

PX

model)

4-track

2-channel

stereo

recording

and

playback

19

cm/s

(7%

ips)

9.5cm/s

(3%

ips)

Approx.

150

seconds

with

740

m

(2,400

ft)

tape

With

1,100

m

(3,600

ft),

27cm

reel

Stereo

recording

180

minutes

at

19cm/s

Mono

recording

720

minutes

at

9.5

cm/s

Record

head

1,

Playback

head

1

Erase

head

1

AC

servo-controiled

capstan

motor

1

Induction

reel

motor

2

Up

to

27cm

(10%-inch)

—

Continued

on

page

2

—

SERVICE

MANUAL

TC-765

Frequency

Response:

With

Sony

Ferri-Chrome

tape

Equalization:

30—25,000

Hz

+

3dB

at

19

cm/s

30—18,000

Hz

+

3dB

at

9.5cm/s

With

SLH

tape

Inputs:

30—25,000

Hz

+

3dB

at

19

cm/s

30—18,000

Hz

+

3dB

at

9.5cm/s

With

regular

tape

30—18,000

Hz

+

3dB

at

19

cm/s

30—15,000

Hz

+

3dB

at

9.5cm/s

Wow

and

Flutter:

NAB

0.04%

WRMS

at

19

cm/s

0.08%

WRMS

at

9.5

cm/s

Outputs:

DIN

40.07%

at

19cm/s

+0.15%

at

9.5cm/s

S/N

Ratio:

61dB

(NAB)

with

Sony

Ferri-Chrome

Tape

61d8

(DIN

1975

rev.)

with

Sony

Ferri-Chrome

Tape

56

dB

(DIN,

old)

Total

Harmonic

Distortion:

0.7%

Other

Jack:

Bias

Frequency:

160

kHz

MODEL

IDENTIFICATION

Specification

label

UK,

AEP

model

US

model

TAPECORDER

TC-765

110.120.220.240V

~~

50/60Hz

90W

MADE

IN

JAPAN

Canadian

model

PX

model

TAPECORDER

TC-765

AC

120V

60Hz

HOW

MADE

IN

JAPAN

3,180uS

+

50uS

(19

cm/s)

3,180uS

+

90uS

(9.5

cm/s)

MIC

(two

phone

jacks)

Sensitivity:

0.2mV

(-72dB)

Impedance:

for

low-impedance

microphone

LINE

IN

(two

phono

jacks)

Sensitivity:

0.06V

(-22

dB)

Impedance:

100

kQ

REC/PB

(connector)

(UK,

AEP,

PX

model)

Input

impedance:

less

than

10k

LINE

OUT

(two

phono

jacks)

Normal

level:

0.435V

(-5

dB)

with

PB

LEVEL

contro!

set

to

center

detent

position

0.775V

(OdB)

with

PB

LEVEL

control

set

to

‘10’

Load

impedance:

100k

Suitable

load

impedance:

more

than

10kQ

HEADPHONES

(binaural

jack)

Load

impedance:

for

low-impedance

headphones

REC/PB

(connector)

(UK,

AEP,

PX

model)

Output

impedance:

Jess

than

10kQ

11-pin

remote

control

connector

0dB=0.775V

SON'Y.

TAPECORDER

TC-765

AC

I20V

60

Hz

HOW

MADE

IN

JAPAN

TAPECORDER

TC-765

AC

I20V

80W

50/60Hz

TC-765

SECTION

1

OUTLINE

1-1.

BLOCK

DIAGRAM

—

System

Control

Section

—

o-—

(REC

EQ

SWITCHING)

eo

(REC

AMP

SWITCHING)

EMITTER

FOLLOWER

y

0732

SCHMIDT

SWITCHING

FLIP

FLOP

TRIGGER

ee

(Fs)

RV9O!

0732

073!

9730

0729,

728

aaa

0725,

724

Nx

“N

~~

TC-765

od

$602

S602"!

[TAPE

SPEED

19cm

—>

9.5em

S60l-|__—_

S60I-2

B+

STABILIZING

SUPPLY

Q704,705

0708~713

Bt

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_

|

BoGENO!D

SUPPLY

a!

8707,708

OPERATES

IN

FOR-

Sour

SWITCHING

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715

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SOLENOID

DRIVER

Q712,

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SOLENOID

ORIVER

Q710

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|

switcuine

|

D719

he

9709

re

|

$605

g

SHUT

OFF

pay

(SUPPLY)

(PB

MUTING)

°

LAMP

DRIVER

LAMP

DRIVER

0760

_|

SWITCHING

0718

9720

722

EMITTER

FOLLOWER

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REEL

SIZE

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SPEED

ADJ

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RV902

9.5¢em

|

all

!

RV702

‘|

INVERSE

0744~747

TENSION

TORQUE

EMITTER

FOLLOWER

:

SUPPLY

REEL

MOTOR

DRIVER

7

a

(FUNCTION

BUTTON]

ea

ms

>

Pl

ly

<Ge<ee

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case.

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POWER

SUPPLY

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8

?-

(C701

:

SYSTEM

aes

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CONTROL

\()~(@):

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0

ON

OFF

(BIAS

OSC)

5603

(7)

b

®

(*)

D766

[TIMER]

7

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Pera

(REC

MUTING)

aes

(AEP,

UK,PX

PORE

mamta

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SUPPLIED

WHEN

B+

‘

TAPE

REC

MODE

SWITCH

e@

(S103,S303)IS

ON.

L,

(LINE

OUT

MUTING)

0765

SWITCHING

©

@

oT

i

748

©)

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cneoi

i

REMOTE

OFF

=

[ozes

EMITTER

ETIPEELOP:

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0764

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SWITCHING

FOLLOWER

sniteeine

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MULTIVIBRATOR

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REC

a740

74!

a74a2

”

0746,

747

O

O O

MONITOR

MUTE

pa

ey

D762

SONY-00527

/

DRUCK

1

$602-2

Sem—>

9.5¢m

7

i/2

3

3/4

CAPSTAN

MOTOR

DRIVER

Q90I~903

D906~

309

00009090000

PT60I

SONY-00527

/

DRUCK

2

1-2.

BLOCK

DIAGRAM

—

Amplifier

Section

—

MIC_ATT

(dB)

0

JO!

Vo

rh

15

Ha

pao

4

Mic

AMP

Q!0!,

102

?

LINE

AMP

RVIO!

Q103

~

105

|

TC-765

|

C135

REC

BIAS

A

DJ

osc

.

py]

S103-4

nee

|

HRIOI

UNIT

ae

eal

7

>

PB

Qt

=

RFI40-2902

;

LI06

[REC]

REC

BIAS

TRAP.

'

[mic]

MUTING

REC

-

aioe

[REC

MODE]

!

US,CANADIAN

MODEL

REC

giog-3

HEE

MOD

$!03-!

—

,

=e

LEVEL

Lioe

REC

£0

ae

F

ees

-

[REC

MODE]

LINE

09

=

&

xX

EFI8-2902A2

}

f$__

Bt

H

si02~|

Sey

p

avers

1

ERASE

REC

aa

5

P

NORMAL—>

SPECIAL—>Fe

~Cr|

yar

H

L107

f

AEP,

UK

PX

MODEL

I

!

|

J

O

9

|

DUMMY

VOLTAGE

RCH

R-CH

?

CONTROL

I

1

switcHinc]

[switchinc]

[switcHinc

|

|switchine

|

[SwiTcHING

L

(EQ)

$501

LINE

AMP

“fe

ve

Qulo

Qill

ail

Qits

aul4

dees

g

18+)

!

Q126,

127

Si06

Rec/

Pe!

LOW*-MED-"HIGH

9

¥ 0

©

¥

©

INPUT

SELECT

|

I

|

iH)

CN5O)

|

REC/PB

l

R-CH

SSS

SS

Se

ae

aS

Se

s

TIO!

t

SWITCHING

|

/2506_ON

WHEN

TAPE

SPEED

HPIOI

RVIO4

p

HEADPHONE

AMP

ef}

950

0506

SWITCH

(S602)

TURNS

me

se

ae

PB EQ

AMP

|PBLEVEL

ADJ

PB

LINE

AMP

|

sts

l]

iaeapeHONES

9.5m(3

3/4)

MODE

QuS

17

ao

Qi2t~

123

3104

D

D103

MONITOR

RVIO6

MEIO!

Fy

FROM

am)

SOURCE

METER

ADJ

STABILIZING

|

_POWER

SUPPLY

GED

RVIOS

{

Osoie

Ge

OF

SYSTEM

CONTROL

f

:

[PB

LEVEL]

TAPE

CD

6

J303

z

ee

eee)

ee

>

{LINE

our

RY502

1@

H

MUTING

4

RY501

|

Ca

gi20

:

PRy503

|

SWITCHING

!

I

|

-

9508 0507

Q507

ON:

I

!

Q508

ON

WHEN

TAPE

SPEED

WHEN

REC

MONITOR

MUTE

SWITCH(S607)

TURNS

OFF,

|

SWITCH

(S602)

TURNS

OR

WHEN

REC

MONITOR

MUTE

SWITCH(S607)

TURNS

|

19cm

(7

1/2)

MODE

ON

AND

MONITOR

SWITCH(SI04)

TURNS

TAPE

DIRECTION

}

IN

PLAYBACK

MODE

i

Fr

!

|

———_-—-—)

Sees

Ce

[pS

See

ea

ee

Se

5

SWITCHING

AEP,

UK

PX

MODEL

|

9509

G

|

(Bean

ON:

WHEN

)

|

(MONITOR

SWITCH(SI04)

TURNS

TAPE

DIRECTION

IN

PLAYBACK:

MODE

|

(eo

ee

a

ed

J

SONY-00527

/

DRUCK

3

1-3.

NOTE

ON

REPAIRING

NOTE

ON

REPAIRING

1.

This

set

does

not

change

playback

level

when

TAPE

SELECT

switches

are

changed.

The

LINE

OUT

signal

is

cut

when

REC

MONI-

TOR

MUTE

switch

(S607)

on

the

rear

panel

is

turned

ON

except

when

MONITOR

switch

is

in

TAPE

position

in

playback

mode.

If

TIMER

switch

is

previously

set

to

ON

position,

it

may

happen

to

erase

test

tapes

because

the

set

becomes

automatically

in

the

auto

playback

(awakening)

or

auto

record

mode

determined

by

REC

MODE

switch

position

when

POWER

switch

is

turned

ON.

PB

LEVEL

controls

on

the

front

panel

control

LINE

OUT

and

HEADPHONES

levels,

and

also

VU

meters

indicate

the

amount

of

PB

LEVEL

controlling.

When

PB

LEVEL

is

in

the

center-

click

positions,

LINE

OUT

levels

are

standard

0.44V

(-5dB)

and

VU

meters

indicate

‘‘0”’.

When

PB

LEVEL

controls

are

in

their

full-

clockwise

stops,

LINE

OUT

levels

are

0.775V

(0

dB).

.

Three

kinds

of

hexagonal-socket

screwdrivers

are

needed

for

the

following

adjustment/

removal.

Screwdriver

Adjustment/removal

Tension-arm

O

+

1.27

Intermediate

ane

Switch

knob

Switch

lever

Head

azimuth

OT

Ls

FG-holding

boss

ee

Control

knob

Motor

pulley

SONY-00527

/

DRUCK

4

|

TC-765

1TC-765

|

Tape

BIAS/EQ

recommendations

The

following

list

shows

the

recommended

settings,

which

have

been

determined

through

critical

listening

tests

and

electrical

character-

istic

measurements

on

commercially

available

tapes.

The

setting

can

be

changed

according

to

the

personal

preference.

For

Sony

tapes,

be

sure

to

use

the

recommended

settings

to

obtain

the

optimum

tape

characteristics.

NORMAL

SPECIAL

BASF

LH,

LHS

SCOTCH

#211,

SONY

PR

AGFA

PE,

PEM

#212,

#213

_|MEMOREX

AMPEX

406,

407

SONY

SLH

SONY

DUAD

SCOTCH

CLASSIC

|SCOTCH

#206,

TDK

AUDUA

#207

MAXELL

UD

SCOTCH

#250

SCOTCH

#218

SECTION

2

DISASSEMBLY

(to

Mechanical

Adjustment)

(to

VU

Meter

and

Variable

Resistor

Replacement)

(to

Fuse

Replacement)

(to

Audio

Amp

Board

Check)

(to

Tape

Speed

and

Forward

Torque

Adjustments)

(to

B+

and

Supply

Reel

Back

Tension

Adjustments)

(to

System

Control

Board

Checking)

Reel

Panel

Removal:

Amp

Panel

Removal:

Perforated

Panel

(top)

Removal:

Perforated

Panel

(bottom)

Removal:

Side

Board

(right)

Removal:

Side

Board

(left)

Removal:

Rear

Board

Removal:

>

0,90

8,0

0,9

0,0

®,®

©,

®

©

CS)

RK3x8

washer

12)

reel

panel

washer

RK

3x8

reel

panel

washer

0

reel

sher

washer

eel

panel

washe

reel

panel

washer

5)

RK3x8

f

°|

amp

panel

perforated

panel

(top)

@

84x10

ral

@

PS4xi0'

perforated

panel

(bottom)

foot

ass’y

rear

board

SONY-00527

/

DRUCK

5

TENSION

ARM

BASE

REMOVAL

Microswitch

Installation

Turn

the

tension

lever

and

adjust

the

position

of

the

microswitch

for

the

specified

clearance

when

switches.

microswitch

(S605)

tension

lever

HEAD

COVER

REMOVAL

RK3x8

@

washer.

OPS3x6

@

tension

arm

@

pinch

roller

-

®

83x8

@®

lever

caps

(Use

hexagonal

screwdriver.

OL

1.27

mm)

Note:

When

reattaching

the

pinch

rollers,

be

sure

to

reattach

the

one

with

“1”

mark

at

the

right

side.

@

tension

roller

cap

(Hold

the

guide

roller

ass’y

and

remove

the

cap

by

turning

counterclockwise.)

E25

plastic

washer

(3mm

dia.)

(4)

tension

roller

ass‘y

@O

kK2x5

@

spacer

@

tension

arm

©

B3x5

@Q

tension

arm

base

@

vee!

panel

RK3x8

washer

}@

washer

©

pinch

roller

screw

!

@

pinch

roller

cap

()

plastic

washer

(4mm

dia.}

!

pinch

roller

with

“1”

mark

'p

tension

arm

{E}

head

cover

|

TC-765

|

REEL

TABLE

REMOVAL

/

0

P3x8

—_¢

49

table

MOTOR

PULLEY

INSTALLATION

Use

a

hexagonal

screwdriver.

©)

1.5mm

motor

pulley

brake

solenoid

holder

chassis

ELECTROSTATIC

DISCHARGE

BRUSH

INSTALLATION

0.5-0.8mm

drive

belt

~

electrostatic

disch

arge

brush

SECTION

3

MECHANICAL

ADJUSTMENT

3-1.

MECHANICAL

ADJUSTMENTS

Tape

Path

Adjustment

1.

In

playback

mode,

travel

a

blank

tape

SLH-S1,

and

adjust

the

positions

of

the

tension-arm

guide

and

intermediate

pin.

adjustment

screws

(hexagonal

socket)

tension

arm

guide

roller

intermediate

Tape

should

travel

in

the

center

of

this

width.

After

the

adjustment,

tighten

the

adjustment

screws.

Travel

a

blank

tape

SLH7-740

and

adjust

the

position

of

the

tape

guides

to

eliminate

tape

curls.

2.

0.025mm

tape

guide

tape

guide

Travel

a

blank

tape

SLH-S1

and

adjust

the

height

of

each

head

for

the

specified

clearances.

To

adjust

the

erase

head

height,

select

appro-

priate

spacer.

To

adjust

the

record

and

playback

heads,

turn

the

height/zenith

adjustment

screws

in

the

same

angle

and

direction.

height/zenith

adjustment

screws

After

the

adjustment,

apply

a

suitable

locking

compound

to

the

adjusted

screws.

SONY-00527

/

DRUCK

6

Reel

Table

Height

Adjustment

|

TC-765

|

—

playback

and

rewind

modes

—

1.

Loosen

the

adjustment

screws

and

adjust

the

height

of

the

reel

tables

for

the

specified

height.

If

the

tape

touches

the

reel

in

playback,

fast

forward

and

rewind

modes,

recheck

the

tension

arms,

standard

reels

and

the

tape.

Pinch

Roller

Lever

Position

Adjustment

Remove

the

head

cover.

Reattach

both

the

pinch

rollers.

Place

the

set

in

the

playback

mode.

Check

that

the

solenoid

is

in

on

condition

(energized).

Loosen

the

adjustment

screw

and

push

the

slide

adjustment

plate

in

the

arrowed

direction

for

the

specified

clearance

between

the

pinch

roller

levers

A

and

B,

and

tighten

the

adjust-

ment

screw.

After

the

adjustment,

apply

a

suitable

locking

compound

to

the

adjustment

screw.

Pinch

roller

lever

B

pinch

roller

{right}

sliding

adjustment

plate

adjustment

screw

Note:

Adjustment

screw

positions

for

the

2T

PB

and

4T

PB

heads

are

the

same

as

the

2T

REC

head.

Azimuth

adjustment

screws

are

so

con-

structed

to

react

each

other.

Take

care

in

adjusting

azimuth

adjustment

screw.

Tape

should

travel

in

the

center

of

this

width.

7"

standard

tape

reels

height/zenith

adjustment

screws

5+0.5mm

(123/39)

reel

tables

SC4x6

chassis

adjustment

screws

(hexagonal

socket}

angle

adjustment

screws

azimuth

adjustment

screws

Brake

Adjustment

(1)

brake

band

shoe

adjustment

screw

brake

band

Adjust

both

the

supply-

and

take-up-side

brakes.

brake

solenoid

brake

band

guide

In

stop

mode,

0.5—0.7mm

clearance

should

exist

between

the

brake-band

guide

and

brake

band.

In

playback

mode

(the

brake

solenoid

should

be

in

ON

condition),

loosen

the

adjustment

screw

and

adjust

the

position

of

the

solenoid

link

in

the

arrowed

direction

so

that

the

brake

band

and

brake-band

guide

uniformely

touch.

solenoid

link

@

In

playback

mode,

the

brake

band

should

uniformely

touch

the

brake

band

guide

at

brake

drum

here.

ge

brake

band

0.5~0.7mm

(35/6q")

In

playback

mode,

this

clearance

should

even.

Note:

If

the

brake-release

stroke

is

long,

the

brake

band

may

bend

at

the

position

shown

with

*.

Be

sure

not

to

bend

the

brake

band.

After

the

adjustment,

apply

a

suitable

locking

compound

to

the

adjustment

screw.

Brake

Adjustment

(2)

and

Brake

Torque

Adjustment

Adjust

both

the

supply-

and

take-up-side

brakes.

In

stop

mode,

loosen

the

adjustment

screw

and

adjust

the

position

of

the

brake

stopper

for

the

specified

clearance

between

the

brake

stopper

and

brake

lever.

brake

stopper

brake

lever

After

the

adjustment,

tighten

the

adjustment

screw

and

apply

a

suitable

locking

compound

to

the

screw.

Adjust

hooking

position.

Measure

both

the

forward

and

backward

brake

torques.

Adjust

spring-hook

position

for

the

specified

torques.

backward

1,800—2,500g-cm

(25-34

oz-inch)

600—700

g-cm

(8.5—9.5

oz-inch)

backward

torque:

adjustment

screw

forward

brake

arm

forward

torque:

reel

table

TC-765

Pinch

Roller

Pressure

Check

—

playback

mode

—

1.

Place

the

dial-cord

ring

between

the

pinch

roller

and

pinch-roller

cap.

pinch

roller

pinch-roller

cap

t

dial

cord

(0.5mm

dia.)

In

playback

mode,

pull

the

spring

scale

on

the

center

line

made

by

the

centers

of

the

capstan

and

pinch

roller.

3.

Slowly

return

the

pinch

roller

and

read

the

spring

scale

just

when

the

pinch

roller

starts

to

rotate.

i

:

SF)

®

OOOO

ae

=

Senn

eee

pinch

roller

spring

scale

800

g—1,200

g,

(1lb

120z—2

lb

10

0z)

\

pressure

difference

Pull.

between

the

take-up

and

supply

sides:

within

200g

(7

02)

Forward

Torque

Adjustment

; ;

hub

for

measurement

Remove

the

side

board

(right).

Apply

the

rated

ac

voltage

to

the

AC

IN.

Set

the

TAPE

SPEED

switch

to

19

cm/s

and

REEL

SIZE

switch

to

10%.

In

playback

mode,

adjust

RV703

for

the

specified

torques.

Set

REEL

SIZE

switch

to

7

and

check

torques.

2

Set

the

tension

REEL

SIZE

switch

arm

to

ON

position

using

a

rubber

band

etc.

"

soz

|

520-580g0m

|

260-320

gem

PRES

Cees

(7.3-8.0

oz

inch}

|

(3.6-4.4

oz

inch}

380-440

g-cm

180—240

g-cm

(5.3-6.1

oz-inch}

|

(2.5—3.3

oz-inch}

TC-765

|

Supply

Reel

Back

Tension

Adjustment

Note:

This

adjustment

requires

a

ultra-low

frequency

audio

signal

generator.

If

the

signal

generator

is

not

available,

do

not

attempt

this

adjustment.

Remove

the

side

board

(left).

Apply

the

rated

ac

voltage

to

AC

IN.

Set

RV702

to

the

fully-counterclockwise

stop.

Put

a

torque

meter

on

the

supply

reel

tape.

Unsolder

the

RED

and

WHT

lead

wires

from

the

FG

at

the

system

control

board.

Set

the

signal

generator’s

frequency

to

20.2

Hz

and

attenuator

to

-20dB.

Connect

the

signal

generator

to

the

points

from

where

the

two

lead

wires

are

unsoldered

in

step

5.

Set

REEL

SIZE

switch

to

10%

and

TAPE

SPEED

switch

to

19

cm.

In

playback

mode,

adjust

RV702

for

specified

torque.

Back

tension

torque

150

g:cm

(2.1

oz

inch)

120

g-cm

(1.65

oz

inch)

Change

the

audio

signal

generator’s

frequency

to

7.14Hz

and

check

the

torque

meter

reeding.

Torque

meter

reeding

280-340

g-cm

(3.9—4.7

oz-inch)

220—280

g:cm

(3.

1—3.8

oz

inch]

Fast

Forward

and

Rewind

Back

Tesnion

Check

Apply

the

rated

ac

voltage

to

AC

IN.

Turn

either

the

left-

or

right-side

tension

arm

on

using

a

rubber

band.

Put

a

torque

meter

on

the

supply

reel

table.

In

fast

forward

mode,

pull

the

torque

meter

in

the

arrowed

direction

at

a

speed

of

19—9.5

cm/s

and

read

the

fast

forward

back

tension

on

the

torque

meter.

Put

a

torque

meter

on

the

take-up

reel

table.

In

rewind

mode,

pull

the

torque

meter

and

read

the

rewind

back

tension

as

in

step

3.

supply

reel

table

take-up

reel

table

torque

meter

Set

the

tension

_

arm

to

ON

position

using

a

rubber

band.

e200

0000

o

REEL

SIZE

switch

sore

710-150

9-cm

80-120

g-:cm

(1.6-2.0

oz-inch)

|

(1.15-1.6

oz-inch)

70—110g-cm

50-90

9:cm

(1.0—1.5

ozinch})

|

(0.7—1.2

oz

inch}

Sony TC-765 User manual

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