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Photo:

TC-K677ES

SPECIFICATIONS

Recording

system

4-track

2-channel

stereo

Fast-winding

time

Approx.

90

sec.

(with

Sony

C-60

cassette)

Bias

AC

bias

Heads

Erasing

head

x

1

(S&F

head)

Recording

head

x

1

(Permalloy

head)

Playback

head

x

1

(LA

head)

Motors

Capstan

motor

x

1

(DC

servo

motor)

Reel

motor

x

1

(DC

motor)

ASIST(mechanical

drive)

motor

x

1

(DC

motor)

Signal-to-noise

ratio

(at

peak

level)

oe

ON ON

Type

lV(Sony

METAL-SLT/S)

Type

II(Sony

UX-S)

Total

harmonic

distortion

1.0%

(with

Sony

METAL-SLT/S

cassette)

Frequency

response

(DOLBY

NR

OFF)

20—21,000

Hz

(+3

dB,

IEC)

20-—16,000

Hz

[+3

dB

OVU

(-4dB)

recording]

20-19,000

Hz

(+3

dB,

IEC)

Type

IV

cassette

(Sony

METAL-SLT/S)

Type

II

cassette

(Sony

UX-S)

Type

|

cassette

|

(Sony

HF-S)

Wow

and

flutter

20—17,000

Hz

(£3

dB,IEC)

pia

+0.09%

W.Peak

(IEC)

0.05%

WRMS

(NAB)

+0.14%

W.Peak

(DIN)

Dolby

Laboratories

Licensing

Corporation.

ma}

Dolby

Laboratories

Licensing

Corporation.

“DOLBY”

and

the

double-D

symbol!

0]

are

trademarks

of

Canadian

Model

AEP

Model

UK

Model

E

Model

TC-K570

US

Model

AEP

Model

TC-K670

US

Model

Canadian

Model

UK

Model

TC-K677ES

Model

Name

Using

Similar

Mechanism

Line

inputs

Sensitivity

77.5

mV

(phono

jacks)

input

impedance

|

47

k

ohms

CD

DIRECT

INPUT!

Input

impedance

|

47k

ohms

Outputs

Tape

Transport

Mechanism

Type

Inputs

0.32

V

at

a

load

impedance

of

47

k

ohms

Over

10

k

ohms

0-1.25

mW

ata

load

impedance

of

32

ohms

Line

outputs

(phono

jacks)

Rated

output

levei

Load

impedance

Headphones

(stereo

phone

jack)

Output

level

General

Power

requirements

US,Canadian

model:

TC-K570:

120V

AC

60Hz

18W

TC-K670,

K677ES:120V

AC

60Hz

19W

AEP,

Germany

model:

220VAC~

50/60Hz

UK

model:

240VAC~50/60Hz

E

model:

120,

220,

240VAC~50/60Hz

18W

Power

consumption

19

W

Dimensions

Approx.

430

x

123

x

300

mm

(w/h/d)

(17

x

4’

x

117

inches)

including

projecting

parts

and

controls

Weight

Approx.

4.9

kg

(10

ibs

13

oz)

Supplied

accessories

Audio

connecting

cords

(2)

Design

and

specifications

subject

to

change

without

notice.

Note

This

appliance

conforms

with

EEC

Directive

87/308/EEC

regarding

interference

suppression.

STEREO

CASSETTE

DECK

ONY.

Dolby

noise

reduction

manufactured

under

license

from

TC-K570/K670/K677ES

|

SAFETY

CHECK-OUT

After

correcting

the

original

service

problem,

perform

the

following

safety

check

before

releasing

the

set

to

the

customer:

Check

the

antenna

terminals,

metal

trim,

‘‘metallized”’

knobs,

screws,

and

all

other

exposed

metal

parts

for

AC

leakage.

Check

leakage

as

described

below,

LEAKAGE

TEST

The

AC

leakage

from

any

exposed

metal

part

to

earth

ground

and

from

all

exposed

metal

parts

to

any

exposed

metal

part

having

a

return

to

chassis,

must

not

exceed

0.5mA

(S00

microampers).

Leakage

current

can

be

measured

by

any

one

of

three

methods.

1.

A

‘commercial

leakage

tester,

such

as

the

Simpson

229

or

RCA

WT-540A.

Follow

the

manufacturers’

instructions

to

use

these

instru-

ments.

2.

<A

battery-operated

AC

milliammeter.

The

Data

Precision

245

digital

multimeter

is

suitable

for

this

job.

3.

Measuring

the

voltage

drop

across

a

resistor

by

means

of

a

VOM

or

battery-operated

AC

volt-

meter.

The

“limit”

indication

is

0.75

V,

so

analog

meters

must

have

an

accurate

low-

voltage

scale.

The

Simpson

250

and

Sanwa

SH-63Trd

are

examples.of

a

passive

VOM

that

is

suilable.

Nearly

all

battery

operated

digital

multimeters

that

have

a

2V

AC

range

are

suitable.

(See

Fig.

A)

To

Expased

Metal

Parts

on

Set

AC

voltmeter

{0.75

V)

0.15

uF

a

eae

=

Earth

Ground

Fig.

A.

Using

an

AC

voltmeter

to

check

AC

leakage.

SAFETY-RELATED

COMPONENT

WARNING!!

COMPONENTS

IDENTIFIED

BY

MARK

/\

OR

DOTTED

LINE

WITH

MARK

/\

ON

THE

SCHEMATIC

DIAGRAMS

AND

IN

THE

PARTS

LIST

ARE

CRITICAL

TO

SAFE

OPERATION.

REPLACE

THESE

COMPONENTS

WITH

SONY

PARTS

WHOSE

PART

NUMBERS

APPEAR

AS

SHOWN

IN

THIS

MANUAL

OR

IN

SUPPLEMENTS

PUB-

LISHED

BY

SONY.

TABLE

OF

CONTENTS

Section

Title

Page

SECTION

1.

GENERAL:

=

=

*

«©

=

=

ee

wie

Ge

xe:

ee

bat

SNS

3

SECTION

2,

DISASSEMBLY:

=

+

*

«=

=

@

8

We

a

4

SECTION

3.

PIN

DESCRIPTION

+

©

©

©

= = ©

«©

©

ww

«©

8

SECTION

4.

ADJUSTMENTS

4-{.

Mechanical

Adjustments

= ©

5

©

#2

#

©

+

Q

4-2,

Electrical

Adjustments

*

"

"°°

=

ss

=

12

SECTION

5.

DIAGRAMS

5-1,

Printed

Wiring

Boards

+

*

=

©

#

s

©

#

©

16

5-2.

Circuit

Boards

Locations

=

+

ss

ee

* &

71

5-3,

Semiconductor

Lead

Layouts"

*

"

*

+

5

=

|

5-4,

Schematic

Diagram

—Audio

Section—-

©

©

*

©

8

©

ee

ee we

22

5-5.

Schematic

Diagram

~System

Control

Section-

*

* * * *

As)

SECTION

6.

EXPLODED

VIEWS

6-1.

Chassis

Sections

*

*

*

*

* *

* #

©

#

#

«

29

6-2,

Front

Panel

Sections

=

*

* *

*

©

ee

30

6-3.

Mechanism

Section

}.5

*

« « =

eee

2

3B]

6-4.

Mechanism

Section

2.*

+ *

*

©

«©

©

«©

©

2 «

39

SECTION

7.

ELECTRICAL

PARTS

LIST:

©

=

=

©

es

©

©

« »

33

MODEL

IDENTIFICATION

—

Specification

Label

—

TC-K570

TC-K670

TC-K677ES

SONYoe

MODEL

NO.

STEREO

CASSETTE

DECK

SERIAL

No.

MADE

IN

JAPAN

US

Canadian

model:

TC-K570:

AC120V

60Hz

18W

TC-K670,

K677ES:

AC120V

6OHz

19W

AEP,

Germany

model:

AC220V~50/60Hz

UK

model:

AC240V~50/60Hz

E

model:

AC120,

220,

240V~50/60Hz

18W

ATTENTION

AU

COMPOSANT

AYANT

RAPPORT

A

LA

SECURITE!

LES

COMPOSANTS

IDENTIFIES

PAR

UNE

MARQUE

/\

SUR

LES

DIAGRAMMES

SCHEMATIQUES

ET

LA

LISTE

DES

PIECES

SONT

CRITIQUES

POUR

LA

SECURITE

DE

FONCTIONNEMENT.

NE

REMPLACER

CES

COM-

POSANTS

QUE

PAR

DES

PIECES

SONY

DONT

LES

NUMEROS

SONT

DONNES

DANS

CE

MANUEL

OU

DANS

LES

SUPPLEMENTS

PUBLIES

PAR

SONY.

SECTION

1

|

TC-K570/K670/K677

ES

G

E

N

E

RAL

This

section

is

extracted

.

from

instruction

manual.

Identification

of

Front

Panel

Parts

For

details,

refer

to

the

page

number

indicated

in

@.

[1]

POWER

switch

[2]

Cassette

holder

[3]

Counter

buttons

RESET

button

©

MEMORY

button

©

[4]

LINEAR

COUNTER

©

[5]

MEMORY

indicator

©

[6]

PEAK

LEVEL

METER

@

TAPE

TYPE

indicator

@

DISPLAY

MODE

button

@

[9]

MONITOR

button

@

MPX

FILTER

switch

@®

BALANCE

control

©

(12)

REC

(recording)

LEVEL

contro!

©

®

DOLBY

NR

(noise

reduction)

switch

@ ©

PHONE

(headphones)

LEVEL

control

@

HEADPHONES

jack

(stereo

phone

jack)

@

INPUT

selector

©

/.

*Remote

control

sensor’

REC

LEVEL

mex

Siren

mogior

.

BA

E

(o)-

-

v

a

.

CALIBRATION

rm

aateY

er

°

*%

aK

~)

@)

@

mecyent

eu

p

_,

Wehr

ir

o

y

w=

Ge)

@

®

“4

a

CT

TE

VT

[17]

REC

(recording)

LEVEL

control

for

calibration

®

BIAS

contro!

®

Tape

operation

buttons

<4

(rewind)

button

>

(fast-forward)

button

@

(stop)

button

B>

(play)

button

IE

PAUSE

button

O

REC

MUTE

(record

muting)

button

®

@

REC

(recording)

button

20|

&

OPEN/CLOSE

button

21]

TIMER

switch

®

*Remote

control

sensor

You

can

remotely

control

this

cassette

deck

with:

-—-

A

remote

commander

that

came

with

a

Sony

amplifier

or

receiver

if

it

has

the

fal

mark

and

cassette

deck

control

capability.

—

An

optional

Sony

remote

commander

with

the

lal

mark

and

cassette

deck

control

capability.

TC-K570/K670/K677ES

|

—

SECTION

2

DISASSEMBLY

Note:

Follow

the

disassembly

procedure

in

the

numerical

order

given.

MECHANISM

BLOCK

Oscrews

(M3

x

8)

Oscrews(M3

x

8)

oN,

on

t

(

tk

L

.

UF

;

SX

@+

BVIT3

x6

@+BVTP3x8

|

CASSETTE

HOLDER

@fush

lever

(lifter)

in

the

direction

of

arrow

and

remove

cassette

holder.

AE

A.

CGAL

27S

@cassette

lid

Otension

spring

ORNAMENTAL

PLATE

CAPSTAN

MOTOR/FLYWHEEL

(TC-K570)

@

Push

lever

(lifter)

in

the

direction

of

arrow

and

remove

ornamental

plate.

@Oscrews

Hook

belt

here

temporarily

when

~~,

reassembling.

Sa

Spacer

t

Py

+

PTPWH2

x

25

¢

@ornamental

plate

@flywheel

P)

a7

se

ee

@Qbracket(thrust

retainer

R)

OW

O+87P2.6x5

CAPSTAN

MOTOR/FLYWHEEL

(TC-K670/K677ES)

PINCH

LEVER

(TC-K570)

®

\

x6

@washer—____

cS

Olever(FR)

@washer

eae

:

/

a

PAO

:

a

a

®+PS3x6

Obelt(capstam

V4)

@release

claw

Q

@

+

PTPWH2

25

Olever(pinch)

PINCH

LEVER

i

(TC-K670/K677ES)

\

C

:

.

Vi

7

@lever(pinch

T)

(jo

@capstan

motor

Qwasher

eS

0O+PS3x6

@bracket

|

V.

Olever(pinch

S)

(thrust

retainer

V4)

ee

ee

@lever

(PS)

COR

ie

om

a>

|

TC-K570/K670/K677ES

REEL

AND

ASSIST

MOTORS

@+8B7TP2x

18

O+8B7P2x18

‘o

E

g

H

@bracket(motor

R)

ass‘’y

Align

boss

of

mode

cam

to

the

point

when

reassembling.

“bai

Ca

boss

\

a

-

of

PAA

Z

mode

cam

LY,

FL

selection

lever

mode

cam

Hook

belt

here

Align

the

line

on

mode

cam

to

temporarily

when

the

tip

of

selection

lever.

reassembling.

+B2.6X6.5

@assist

motor

Spacer(mot

e

gion

‘bracket(motor

R)

ass’y.

Oree/

motor

board

@ree/

motor

TC-K570/K670/K677ES

SECTION

3

PIN

DESCRIPTION

©1C701

M50941-483SP(MICRO

COMPUTER)

The

M50941-483SP

function

are-described

below.

[rine

[178

[rt

1

|

Vrer

Internal

A/D

port

reference

voltage

input.

2

KEY

7

Key

input

port.

OV

=

OPEN/CLOSE,

1V

=

STOP,

2V

=

REW,

3V

=

FF,

4V

=

REC.

3

KEY

6

I

key

input

port.

OV

=

PLAY,

IV

=

PAUSE,

2V

=

REC

MUTE.

.

4

KEY

5

I

Key

input

port.

OV

=

RESET,

1V

=

MEMORY,

2V

=

DISPLAY

MODE,

3V

=

MONITOR.

5

METER-L

|

Signal

input

for

level

meter-L.

6

METER-R

I

Signal

input

for

level

meter-R.

7

TIMER

I

Timer

REC/PLAY

switch

input.

OV

=

TIMER

REC,

1V

=

TIMER

PLAY,

2V

=

OFF.

8

T.

PULSE

I

Take-up

reel

base

sensor

input.

9

S.

PULSE

I

Supply

reel

base

sensor

input.

10

AMS.

SIG

I

AMS

signal

input.

No

song

detected

=

Low.

Song

detected

=

High.

1]

BIAS

0

Bias

oscillation

on

and

off

control.

12

MO3V

0

Motor

speed

control.

STOP/PLAY

=

Low,

FF/REW

=

High.

18

M04,

5V

0

Motor

speed

control.

STOP/PLAY

=

High,

FF/REW

=

Low.

14

MO-FWD

0

Reel

motor

rotates.

15

MO-REV

0

Reel

motor

rotates

in

reverse.

16

MO-DOWN

0

Head

base

DOWN

output

of

the

mechanical

block.

17

MO-UP

0

Head

base

UP

output

of

the

mechanical

block.

18

HALF-SW

I

HALF

switch

input

of

the

mechanical

block.

19

REC-SW

I

REC

switch

input

of

the

mechanical

block.

20

DOOR-SW

I

DOOR

switch

input

of

the

mechanical

block.

21

CLOSE-SW

I

CLOSE

switch

input

of

the

mechanical

block.

22

OPEN-SW

I

OPEN

switch

input

of

the

mechanical

block.

23

POWER-OUT

0

“Low”

for

power

off

procedure

after

POWER

switch

is

turned

off.

24

POWER-IN

I

Power

(AC)

off

detection.

25

|

Remote

control

signal

input.

26

oe

GND

27

I

System

reset

input.

28

I

Clock

input

(4.

19MHz).

29

0

Clock

output.

30

_

Not

used.

31

zc

Not

used.

32

Ves

=

GND

33

Not

used.

34°

|

PATS

I

| |

Rotary

encoder

input

to

detect

the

position

of

the

head

base

of

the

mechanical

block.

37

PATO

I

38

ZV

=

Power

supply

for

driving

the

fluorescent

indicator

tube.

39

FL~p

0

|

|

|

Segment

data

output

for

the

fluorescent

indicator

tube

FL751.

54

FL-a

0

55

FL-G5

0

| | |

Common

data

output

for

the

fluorescent

indicator

tube

FL751.

59

FL-G1

0

60

MONI

TOR

0

Source

monitor

control.

Low

=

TAPE,

High

=

SOURCE.

61

REC-MUTE

0

REC

MUTE

control.

Low

=

MUTE.

62

LINE-MUTE

0

LINE

MUTE

control.

Low

=

MUTE.

63

AVec

i

Analog

power

supply(+5V).

64

Vec

=

Power

supply(+5V).

SECTION

4

ADJUSTMENTS

1.

MECHANICAL

ADJUSTMENTS

PRECAUTION

Adjustment

Position:

As

seen

from

the

cassette,

side

(top)

and

MD

as

seen

1.

Clean

the

following

parts

with

a

denatured-alcohol-moistened

swab:

TC-KB70/KB77ES

record/playback

head

pinch

roller

head

on

(bottom).

erase

head

rubber

belts

capstan

idler

2.

Demagnetize

the

record/playback

head

with

a

head

demagnerizer.

3.

Do

not

use

a

magnetized

screwdriver

for

the

adjustments.

4.

After

the

adjustments,

apply

suitable

locking

compound

to

the

parts

adjusted.

Tape

Path

Adjustment

Note:

When

using

the

adjustment

methods

for

other

than

replacement

reasons,

please

do

not

tamper

unnecessarily

with

the

adjustment

screws

or

the

erasehead

because

either

the

Supply

pinch

Takeup

pinch

supply

pinch

roller

guide

or

the

record/

roller

Erasehead

Record/playback

roller

playback

head

will

be

made

the

standard

tape

head

paths.

Moreover,

when

it

is

necessary

to

adjust

and

replace

two

or

more

of

any

of

the

heads

and/or

pinch

rollers,

replace

them

one

TC-K570

by

one,

completely

taking

out

the

first

tape

path,

and

then

replacing

the

second

one.

(TC-K670/K677ES)

Preparation

:

1.

Mirror

cassette

CQO09C

8-909~708-01

(or

CQO012C

8-909-708-02)

If

one

does

not

have

this,

cut

out

the

sections

of

a

120-minute

cassette

shell

as

indicated

below

head

@

and

use

that

cassette.

Record/playback

Takeup

pinch

head

roller

Definition

of

Terms:

The

figures

are

of

a

record/

playback

head.

Height

Declination

Depth

Azimuth

Cut

out

2.

Phillips

screwdriver

(medium-size)

:

For

the

head

adjustment

screws

Blade-type

screwdriver

(large-size)

:

For

the

supply

pinch

roller

adjustment

screws

3.

Pen

light

4,

WS-48B

(3

kHz,

0

dB)

5.

P-4-A100

(10

kHz,-10

dB)

Adjustment

Method

:

Supply

Pinch

Roller!

:

Note:

Only

perform

this

adjustment

when

the

supply

TC-K670/K877ES

pinch

roller

is

to

be

replaced.

Insert

the

mirror

cassette

and

put

the

unit

in

record/playback

mode.

Check

to

see

whether

the

tape

is

curling

at

the

record/playback

head

guide

or

the

pinch

roller

guide.

If

it

is

curling,

remove

the

curl

by

adjusting

the

®

tape

curl

adjustment

screw.

Then,

check

that

the

tape

is

running

past

the

middle

of

the

erasehead.

Record/

playback

Head

Note:

Only

perfom

this

adjustment

when

the

record

/playback

head

is

to

be

replaced.

Insert

the

mirror

cassette

and

put

the

unit

in

record/

playback

mode.

(Height

Adjustment)

Check

to

see

if

the

tape

is

curling

at

the

tape

guide

of

the

head.

If

it

is

curling,

tighten

screws

@,

©,

and

@,

respectively

by

the

same

angle,

moving

the

head

so

that

it

remains

at

the

same

angle

throughout

the

procedure.

If

it

curls

on

the

bottom

side

of

the

mirror

cassette

(actually

the

inner

side),

tighten

all

the

screws

equally;

but

loosen

them

if

the

tape

begins

to

curl

on

the

top

side

(outer

side).

ane

=

,

Outside

normal

Curling

on

the

Curling

on

the

(record/playback

head

inner

side.

outer

side.

as

seen

from

the

side

Tighten

screws

Loosen

screws

of

the

erasehead.)

4,

©,

and

@.

@,®,

and

@.

(Declination

Adjustment)

While

in

the

record/

playback

position,

set

the

back

tension

to

0

(wind

the

supply

reel

with

something

thin

like

a

pencil

in

a

counterclockwise

direction)

and

make

sure

there

is

no

curling

or

shifting

(shifting

up/

shifting

down)

at

the

guide

of

the

record/

playback

head.

Because

shifting

can

only

occur

due

to

a

difference

in

the

width

of

the

tape

and

that

of

the

tape

guides

(curling

will

otherwise

occur),

it

is

necessary

to

pay

close

attention

since

it

can

be

easily

overlooked.

When

there

is

a

shift,

tighten

screws

©

and

@

equally

and

change

the

declination

of

the

head.

If

the

tape

is

shifting

up,

tighten

the

screws,

and

if

it

is

shifting

down,

loosen

them.

Repeat

the

adjustments

in

steps

2

and

3

and

fine

adjust

the

height

and

the

declination.

(Preliminary

Azimuth

Adjustment)

After

demagnetizing

and

cleaning

the

adjustment

head,

play

back

WS-48B

(3

kHz,

0

dB).

Turn

screw

@

so

that

the

reading

on

the

level

meter

of

the

unit

or

that

of

the

level

meter

connected

to

LINE

OUT

is

maximized.

If

the

screw

is

turned

at

least

half

a

revolution,

repeat

the

adjustments

from

step

1.

(Tape

Path

Check)

Connect

the

oscilloscope

to

LINE

OUT

and

play

back

P~4-A100

(10

kHz,

-10

dB)

to

display

a

resurge

waveform.

After

20

seconds

of

record/playback

(after

the

tension

within

the

loop

has

been

increased

sufficiently),

make

sure

the

variation

in

the

resurge

is

within

+

90

degrees

(within

+45

degrees

is

desired).

If

the

variation

is

greater

than

this,

it

is

because

the

declination

and/or

the

height

adjustment

is

not

perfect.

Repeat

the

adjustments

from

step

1.

test

tape

P-4-160

(10

kHz,

~10

dB)

Oscilloscope

L-CH 47kQ

LINE

CUT

Oscilloscope

Resurge

Waveform

OOAOOQV®

In

Phase

45°

cases

180°

SRL).

coli

en

Good

ae

a

>

TC-K670/K677ES

Note:

Only

perform

this

adjustment

when

the

erasehead

is

to

be

replaced.

Insert

the

mirror

cassette

and

put

the

unit

in

record/

playback

mode.

(Azimuth

Adjustment)

Adjust

the

azimuth

of

the

erasehead

by

adjusting

screws

@

and

@

so

that

the

tape

runs

as

evenly

as

possible.

pe

tor

TT

Tighten

@

Tighten

@

Loosen

@

Loosen

@

(The

erasehead

as

seen

when

erasing

the

mirror

cassette.)

Normal

(Height

adjustment)

Turn

screws

®,@,

and

@

all

by

the

same

angle

so

that

the

portions

of

the

erasehead

visible

at

top

and

bottom

are

nearly

of

equal

width.

If

the

width

at

the

top

is

greater,

tighten

the

screws;

if

the

width

at

the

bottom

is

greater,

loosen

the

screws.

Erasehead

(The

erasehead

as

seen

through

the

mirror

cassette.)

4.

Tape

—»

a

Cay

Make

these

the

same

width.

(Declination

Adjustment)

Leaving

it

in

the

playback

position,

put

the

back

tension

to

0

and

make

certain

the

erasehead

part

and

supply

pinch

roller

guide

part

do

not

shift.

If

there

is

a

shift,

turn

the

screw

®

and

change

the

declination.

Looking

at

it

using

the

mirror

cassette,

if

the

tape

shifts

up,

tighten

the

screw,

and

if

it

shifts

down,

loosen

the

screw.

Repeat

the

adjustments

beginning

with

step

2

and

fine

adjust

the

height

and

declination.

And

make

sure

the

tape

does

not

curl

up

on

the

pinch

roller

guide

or

the

guide

part

of

the

record/playback

head.

(Depth

Adjustment)

In

order

to

make

the

entire

head

play

the

tape

smoothly,

and

to

make

sure

the

depth

of

the

erasehead

is

neither

too

shallow

nor

too

deep,

loosen

screw

@

a

bit,

About

0.56

mm

ae

_}

T

I

oa

Normal

Erasehead

~~

|

Record/

playback

“fT

|

7

>

head

Not

deep

enough

Too

deep

Check

1.

Check

to

make

sure

that

there

are

no

curls

or

shifts

throughout

the

whole

tape

path

and

that

the

tape

runs

smoothly.

2.

Reapply

the

locking

compound

to

the

adjusted

screws.

(The

locking

compound

should

only

be

applied

to

screw

©

after

the

azimuth

has

been

adjusted.)

TORQUE

MEASUREMENT

Torque

Torque

meter

C

Q-102C

‘28-60

g-

cm(0,

39-0.

83

02

+

inch)

FWD

CQ-102C

TC-K570:1-5

g

+

cm(0.

014-0.

069

oz

+

inch)

Back

tension

|

Yo-ro/eorrs:7-1

g

+

cm(0.

097-0.

15

0z

*

inch)

PF,

REW|

CQ-201B

|

85-90

g

+

cm(0,

9-1.

25

02

«

inch)

Meter

reading

Pinch

Rolier

Pressing

Force

Measurement

Mode

:

playback

Hook

needle

of

the

tension

gauge

to

the

pinch

roller

shaft

and

push

back

pinch

roller

to

detach

it

from

capstan.

Then,

return

it

gradually

to

capstan

and

read

the

gauge

when

the

pinch

roller

begins

turnning.

Standard

Limits

:

Tape-up

side

.

TC-K570

:

210-320

g(7.

4-11.3

02)

TC-K670/K677ES

:

270-350

g(9.

5-120

02)

Supply

side

TC-K670/K677ES

:

180-280

g(6.

4-9.9

oz)

capstan

pinch

roller

tension

gauge

2.

ELECTRICAL

ADJUSTMENT

Note:

The

adjustment

should

be

performed

in

the

order

given

in

the

service

manual.

As

a

rule,

adjustments

about

playback

should

be

performed

before

those

about

recording.

The

adjustments

should

be

performed

before:

for

both

L-CH

and

R-CH.

*

Switches

and

controls

shoud

be

set

as

follows

unless

otherwise

specified.

DOLBY

NR

switch:

OFF

MPX

FILTER

switch:

OFF

MONITOR

switch:

Tape

*

Standard

Record:

Deliver

the

standard

input

signal

level

to

the

input

jack

and

set

the

REC

LEVEL

control

to

obtain

the

standard

output

signal

level.

~

Record

Mode

—

AF

OSC

LINE

OUT

LINE

IN

Standard

Input

Level

LINE

IN|

source

impedance

10kQ

___

input

level

0.25

V

(-

10

dB)

|

Standard

Output

Level

LINE

OUT

[toad

impedance

|_—a7EQ

adv

(=

5B)

Test

Tape

|_P-4-A100

|

10

kHz,

~104B

|

Azimth

Adjustment

_|

PB

Level

Adjusumet

WS-48B

Tape

Speed

Adjustment

Test

Mode

This

set

will

get

into

test

mode

by

shorting

the

pins

of

CNE707

(TEST)

on

MA

I

N(A)

board

before

turning

the

power

on.

Record/Playback

Head

Azimuth

Adjustment

Porcedure:

1.

Mode:

FWD

playback

Tast

jee

P-4-A100

(10

kHz,

~

10

dB)

VTVM

LINE

OUT

2.

Turn

the

adjustment

screw

for

the

maximum

output

levels.

If

these

levels

do

not

match,

turn

the

adjustment

screw

until

both

of

output

levels

match

together

within

|

dB.

within

L-CH

peak

within

1

dB

Da

R-CH

ie

peak

crew

,

am

—

position

angle

L-CH

peak

R-CH

peak

3.

Phase

Check

Mode:

playback

test

tape

P-4-A100

(10

kHz,

—

10

dB)

L-CH

A7kQ4

oscilloscope

LINE

OUT

Screen

pattern

in

phase

45°

90°

135°

180°

bo

nmnnmne

aamenncentll

Good

Wrong

4.

After

the

adjustment,

lock

the

screws

with

locking

compound.

Adjustment

Location:

Record/Playback

head

TC-K570

TC-K670/K677ES

Adjustment

screw

Adjustment

screw