Sanyo M1990FE User manual

SERVICE

MANUAL

p~

|

qe

SANYO

MINI

AM/FM

STEREO

RADIO

CASSETTE

RECORDER

MISSOFE

EUROPE

©)

®

5

wm

>

142

36005

SPECIFICATIONS

Power

Source

Frequency

Response

[Headphonel

DC

ica

6V

(Mignonzellen,

R6

x

4)

Fe203

(Overall)

...............ccce

cee

eee

40Hz

~

8kHz

Output

Power

Metal

(Overall)

.................00.000c

ee

40Hz

~

8kHz

Sp6ak@ls

ye

cheapie

cache

ig

ti

eakwoked

toaad

ote

1,400mW

(max.)

Erase

Ratio

(Overall)

Headphone

(10%

dist.)

.............0064.

23mW

x

2

F208

.....

cece

ieee

eee

eeetaeseneeeens

60dB

Current

Consumption

(at

Vol.

min.)

Signal

to

Noise

Ratio

(with

Fe2O3)

......

46dB

Record

made

(Fe203)

................665

145mA

Crosstalk

(with

Fe2O3)

Playback

mode

.....................0006-

135mA

Track

tO

Track

2.0...

eee

cece

eee

70dB

Fast

Forward/Rewind

mode............

170mA

Channel

Separation

(with

Fe2O3)

.......

38dB

Recording

System

...................0..56.

AC

Bias

Harmonic

Distortion

(with

Fe2O3)

.......

4.0%

Erasing

System

.................6.0

senses

Magnet

Erasing

Terminal

Impedance

Tape

Speed

si62c00eiscees

essed

tees

1-7/8ips.

+3%

MIGin

ds

sscevsnnititadas

ventaheeteated

coasntels

0.3mV/6kQ

Wow

&

Flutter

...............

cc

cece

ee

eee

0.35%

UNWTD.

Headphone

.............ccceeee

cece

eee

320

Fast

Forward/Rewind

Time

..............

200sec.

(with

C-60)

Oscillation

Frequency

....................

50kKHz

Frequency

Response

[Speaker]

Frequency

Range

Fe2O3

(Overall)

...............ccce

eee

ee

125Hz

~

8kHz

BM

os

shecdomcostent.

ft

tan

atta

samasbanbaetan’

525

~

1,605kHz

Metal

(Playback)

.........................

125Hz

~

12kHz

EM

iio

dtateitaee

oN

wah

ade

eeu

88

~

108MHz

—Specifications

subject

to

change

without

notice.—

NOTE:

The

above

mentioned

specifications

are

mainly

based

on

the

IHF

measurements

standard.

They

can

therefore

not

directly

be

compared

with

specifications

based

on

the

DIN

standard

or

other

standards.

WM-

7752

DISASSEMBLY

INSTRUCTIONS

GENERAL

REMARKS

CASSETTE

COMPARTMENT

LID

REMOVAL

Before

disassembling

the

unit,

spread

a

soft

rubber

mat

or

a

1.

Open

the

cassette

compartment

lid

by

pressing

the

cloth

on

the

workbench.

(Do

not

spread

anything

which

is

STOP/EJECT

button

and

take

out

the

cassette

tape.

likely

to

cause

static

electricity.)

Do

not

make

grease

stains

and

scratches

over

the

unit.

2.

Unlock

the

clicks

of

the

lid

from

the

Cabinet

Top

by

pushing

Reassemble

the

unit

noting

the

kinds

of

screws

and

the

solder-

both

sides

of

the

lid

forcibly.

ing

and

arrangement

of

the

leads.

Refer

to

“Wiring

Diagram

and

Exploded

Views”

for

correct

assembly.

HANDLE

REMOVAL

1.

Lock

the

right

and

left

Stoppers

by

pushing

them

aginst

the

Cabinet

Bottom.

Cassette

Compartment

Lid

3.

Reassemble

in

reverse

order.

Stopper

oe

CABINET

BOTTOM

REMOVAL

1.

Before

removing

the

Cabinet

Bottom,

be

sure

to

release

the

2.

Push

down

the

Handle,

so

that

it

touches

the

unit

body.

Handle

Stoppers

from

the

Cabinet

Bottom.

2.

Turn

over

the

unit

and

open

the

battery

compartment

lid.

Then,

take

out

the

four

batteries

from

the

compartment

and

remove

the

three

screws

(1

~

3)

fastening

the

Cabinet

3.

Pull

one

side

of

the

Handie

downward

about

15mm

and

do

Bottom.

the

same

for

the

other

side.

Then,

remove

the

Handle

by

pulling

the

both

sides.

Battery

Compartment

Lid

4.

Reassemble

in

reverse

order.

3.

DISASSEMBLY

INSTRUCTIONS

(continuea)

Insert

the

flat-bladed

tip

of

the

screwdriver

into

a

slot

on

the

Cabinet

Bottom.

Pry

the

three

slots

one

by

one

to

open

the

Cabinet.

Cabinet

Bottom

Cabinet

Top

NOTE:

Be

careful

not

to

scratch

the

Cabinet

with

the

screwdriver.

Lift

the

Cabinet

Bottom

in

the

direction

of

the

arrow,

pull

out

the

Connector

of

the

Rod

Antenna

from

the

Radio

Tuner

P.C.Board,

and

then,

remove

the

Cabinet

Bottom.

Reassemble

in

reverse

order.

CABINET

TOP

REMOVAL

1.

Remove

the

Cabinet

Bottom

by

following

its

removal

in-

structions

and

disconnect

the

two

speaker

leads.

Detach

the

Tuning

Knob,

Volume

Control

Knobs,

Band

Select

Switch

Knob,

Tape

Select

Switch

Knob,

Tone

Switch

Knob,

FM

Mode

Switch

Knob,

and

the

Jack

Plate.

Remove

the

two

screws

(4

and

5)

and

detach

the

Band

Select

Lever

and

the

Band

Select

Plate.

Band

Select

Lever

Band

Select

Plate

Band

Select

Switch

.

Remove

the

Three

red

screws

(6

~

8),

lift

the

Radio

Chassis

in

the

direction

of

the

arrow,

and

then,

detach

the

Cabinet

Top,

noting

the

speaker

lead.

.

Detach

the

Function

Switch

Knob.

NOTE:

After

the

Cabinet

Top

has

been

mounted

on

the

unit,

attach

the

Function

Switch

Knob

Reassemble

in

reverse

order.

DISASSEMBLY

INSTRUCTIONS

(continued)

AMPLIFIER

P.C.BOARD

REMOVAL

1.

Remove

the

Cabinet

Top

by

following

its

removal

instruc-

tions

and

then

disconnect

the

following

leads.

*

Four

leads

(brown,

red,

violet

and

black)

of

the

Motor

Governor

P.C.Board.

*

Two

leads

(white

and

orange)

of

the

FM

Mode

Switch

P.C.Board.

2.

Remove

the

screw

(9)

fastening

the

Amplifier

P.C.Board

and

the

washer.

Then,

detach

the

Shield

Plate.

3.

Remove

the

two

screws

(10

and

11)

fastening

the

Amplifier

P.C.Board.

Then,

remove

the

Switch

Bracket

from

the

Head-

phone

Jack

P.C.Board

by

pulling

the

Amplifier

P.C.Board

to-

wards

the

microphone

jack.

4.

Detach

the

Amplifier

P.C.Board

by

lifting

it

in

the

direction

of

the

arrow,

noting

the

leads.

Spring

Washer

Shield

Plate

5.

Reassemble

in

reverse

order.

RADIO

TUNER

P.C.BOARD

REMOVAL

1.

Remove

the

Cabinet

Top

by

following

its

removal

instructions.

2.

Remove

the

two

screws

(12

and

13)

fastening

the

Volume

Control

and

then,

the

Radio

Tuner

P.C.Board

by

lifting

it

in

the

direction

of

the

arrow.

Radio

Tuner

P.C.Board

NORE:

Do

not

turn

the

Tuning

Shaft

before

the

Radio

Tuner

P.C.Board

is

reassembled.

Securely

insert

the

shaft

of

the

variable

capacitor

into

the

Drum

when

the

Radio

Tuner

P.C.Board

is

reassembled.

3.

Reassemble

in

reverse

order.

RADIO

CHASSIS

REMOVAL

1.

Remove

the

Cabinet

Top

by

following

its

removal

instructions.

2.

Remove

the

screws

(14)

fastening

the

Pointer

Rail

and

then,

the

Mechanism

Chassis

from

the

fixtures

on

the

Radio

Chassis,

noting

the

leads.

Pointer

Rail

Radio

Chassis

3.

Reassemble

in

reverse

order.

ADJUSTMENTS

GENERAL

REMARKS

e

Before

adjusting

the

mechanism

of

the

unit,

wipe

the

tape

contacting

surfaces

clean

as

well

as

the

rubber

surfaces

of

the

driving

parts

with

a

soft

cloth

soaked

in

alcohol.

Trouble

may

occur

because

of

oil

and

grease

stains.

e@

Keep

the

belts

clean

while

the

adjustments

are

performed.

EQUIPMENT

REQUIRED

@

VTVM

Frequency

Counter

Dummy

Load

(330)

DC

Constant-voltage

Regulator

Test

Tapes

*

3kHz

Test

Tape

(Example:

TEAC

MTT-111)

for

Tape

Speed

Adjustment

*

10kHz

Test

Tape

(Example:

TEAC

MTT-114)

for

Head

Azimuth

Adjustment

*

1kHz

Test

Tape

(Example:

TEAC

MTT-118)

for

Playback

Balance

Adjustment

Normal

tape

for

Recording

and

Playback

operations

(Example:

TDK

AC-222)

e

Alignment

Tool

Before

the

Electrical

Adjustment,

set

the

unit

as

follows:

*

Function

Switch

........0000...c

cc

cccecceeeeeeeeeeaeeeenanas

TAPE

*

Tape

Select

Switch

.................c0ccccc

eee

sees

eee

NORMAL

*

Tone

SWitCh

........00.

ccc

cece

ccc

eeee cece

ees

eenaeenunenes

HIGH

NOTE:

Supply

6.0V

DC

from

the

constant-voltage

regulator

to

the

external

power

jack

for

the

adjustment.

NOTES

ON

HANDLING

THE

CHIP

ELEMENT

Pay

due

caution

to

the

following

items:

1.

Donot

use

the

removed

chip

element

again.

2.

Usea

soldering

iron

of

less

than

30W.

*

The

soldering

iron

should

not

touch

the

body

of

the

chip

element.

Complete

soldering

in

a

short

time.

Apply

solder

to

the

chip

element

as

illustrated

below.

Chip

Element

Solder

Chip

Element

Solder

P.C.Board

(Incorrect)

(Correct)

FLYWHEEL

THRUST

ADJUSTMENT

The

clearance

between

the

Flywheel

Thrust

and

the

Flywheel

should

be

0.05

~

0.15mm

with

the

Chassis

turned

over.

lf

necessary,

adjust

the

clearance

by

the

following

procedure.

1.

While

moving

the

Capstan

up

and

down,

slowly

turn

the

Fly-

wheel

Thrust

clockwise

to

obtain

the

clearance

of

“O”

(zero)

between

the

Thrust

and

Flywheel.

NOTE:

Do

not

turn

the

Flywheel

Thrust

forcibly.

Adjustment

S|

|e

Flywheel

Support

—

Flywheel

Thrust

eee

i

|

0.05

~

0.15mm

/

Flywheel

——’

+

2.

Turn

the

Thrust

counter-clockwise

by

45°

~

90°

(approx.)

from

the

position.

3.

After

the

adjustment,

secure

the

Thrust

with

paint

or

glue.

POWER

SWITCH

ADJUSTMENT

1.

Check

to

see

that

the

clearance

of

the

switch

contacts

is

about

0.5mm

with

the

Power

Switch

in

contact

with

the

Switch

Actuate

Arm

as

illustrated.

Screw

=

;—

Power

Switch

\

/

He

~

Switch

On;

Actuate

Arm

=

“O”

(zero)

qi

V

\

\__gwiten

Bracket

~y

[|

0.5mm

2.

If

necessary,

loosen

the

screws

fastening

the

power

switch

and

move

the

switch

to

the

specified

position.

3.

After

the

adjustment,

tighten

the

screw

and

secure

the

switch

with

paint

or

glue.

ADJUSTMENTS

(continuea)

TORQUE

LIMITTER

ADJUSTMENT

This

adjustment

shall

be

performed

to

prevent

the

torque

limit-

ter

intrusion

of

more

than

required

into

the

Flywheel

when

the

unit

is

set

in

the

fast

forward

or

rewind

mode.

1.

Supply

6V

DC

into

the

Motor

Governor

P.C.Board

to

rotate

the

Motor.

Then,

set

the

unit

in

the

fast

forward

mode

by

pressing

the

F.FWD

button.

2.

Loosen

the

screw

by

turning

it

about

90°

counter-clockwise

from

the

position

where

the

screw

is

securely

tightened

as

illustrated.

Torque

Limitter

Flywheel

3.

Slowly

turn

the

adjusting

screw

counter-clockwise

until

the

rotation

of

the

Torque

Limitter

stops

while

the

Flywheel

Support

is

held

in

place.

4.

Turn

the

adjusting

screw

180°

~

200°

clockwise

from

the

above

position

and

confirm

that

the

clearance

of

0.2

~

0.3mm

is

obtained

between

the

shaft

of

the

Torque

Limitter

and

the

Idler

Adjust

Plate

as

illustrated.

Torque

Limitter

Shaft

0.2

~

0.3mm

Idler

Adjust

Plate

Turn

to

adjust.

5.

After

the

adjustment,

tighten

the

fastening

screw

and

secure

the

fastening

screw

and

adjusting

screw

with

paint

or

glue.

TAPE

SPEED

ADJUSTMENT

1.

Connect

the

frequency

counter

to

the

headphone

jack

as

il-

lustrated

and

remove

the

battery

compartment

lid.

Frequency

Counter

3,000Hz

(+

3%)

HEADPHONES

2.

Insert

a

3kHz

test

tape

(Example:

TEAC

MTT-111)

into

the

cassette

compartment

and

play

back

the

test

tape.

3.

While

playing

back

the

test

tape,

adjust

the

tape

speed

by

turning

the

potentiometer

(P801)

on the

Motor

Governor

P.C.Board

until

the

frequecy

counter

reads

3,000Hz

(+

3%).

Tape

Speed

Adjusting

Volume

HEAD

AZIMUTH

ADJUSTMENT

1.

Connect

the

two

VTVMs

and

the

dualtrace

synchroscope

to

the

headphone

jack

as

illustrated.

Then,

set

the

dualtrace

synchroscope

as

follows:

*

IMODE

onscsn

geal

bagcd

Tass

wea

ats

CHOP

(chopped)

*

SOURCE

.............

cece

INT

(internal),

CH1

or

CH2

”

AUTO

(automatic)

STEREO

HEADPHONES

ADJUSTMENTS

(continued)

NOTE:

Adjust

the

field

on

the

synchroscope

with

the

VOLT.

ADJ.

and

TIME

ADJ.

2.

Insert

the

10kHz

test

tape

(Example:

TEAC

MTT-114)

into

the

cassette

compartment.

While

playing

back

the

test

tape,

turn

the

azimuth

adjusting

screw

until

the

wave

forms

of

the

right

and

left

channels

are

superimposed

and

set

to

optimum

at

the

maximum

reading

on

the

VTVM.

Adjustment

S|

Azimuth

Adjusting

Screw

R/P

Head

3.

After

the

adjustment,

secure

the

adjusting

screw

with

paint

or

glue.

PLAYBACK

BALANCE

ADJUSTMENT

1.

Connect

the

two

VTVMs

to

the

headphone

jack

as

illustrat-

ed

and

insert

a

1kHz

test

tape

(Example:

TEAC

MTT-118)

into

the

cassette

compartment.

VTVM

Dummy

Load

332

STEREO

HEADPHONES

Dummy

Load

330

2.

While

playing

back

the

test

tape,

check

that

the

left

channel

output

is

identical

to

the

right

channel

output

on

the

VTVMs.

If

necessary,

turn

the

potentiometer

(P202)

until

the

right

channel

output

becomes

equivalent

to

the

left

channel

output.

RECORDING

BIAS

ADJUSTMENT

LEFT

CHANNEL

1.

Connect

the

audio

signal

generator

and

the

attenuator

to

the

left

channel

microphone

jack,

and

the

VTVM

to

the

left

channel

output

terminal

of

the

headphone

jack

as

illustrated.

Attenuator

0.031

mV

(-90dB)

Audio

Signal

Generator

1kHz,

8kHz

STEREO

HEADPHONES

7

|

Dummy

Load

330

1kHz

=

8kHz,+3dB

2.

Insert

a

normal

tape

(Example:

TDK

AC-222)

into

the

cassette

compartment

and

alternately

record

the

1kHz

and

8kHz

signals

from

the

audio

signal

generator

at

0.031mV

(-90dB)

on

the

tape

several

times.

3.

While

playing

back

the

recorded

signals,

check

that

the

8kHz

signal

output

is

identical

to

the

1kHz

signal

output

or

the

deviation

is

+

3dB

on

the

VTVM.

4.

If

necessary,

adjust

the

output

by

turning

the

potentiometer

(P101)

and

re-check

the

output

of

each

signal

by

playing

back

the

signals

after

recording

operation

of

the

signals.

5.

Repeat

the

above

adjustment

until

the

specified

output

is

obtained.

RIGHT

CHANNEL

Connect

the

audio

signal

generator

and

the

attenuator

to

the

right

channel

microphone

jack,

and

the

VTVM

to

the

right

channel

terminal

of

the

headphone

jack.

Then,

adjust

the

potentiometer

(P201)

for

the

right

channel

by

following

the

same

procedure

as

in

LEFT

CHANNEL.

=7=

EQUIPMENT

REQUIRED

Generator

Scope

Loop

Antenna

VTVM

Distortion

Meter

NOTE:

Use

an

alignment

tool

with

plastic

grip

for

all

adjustments.

AM

ALIGNMENT

Alignment

AM

Standard

Signal

Generator

FM

Standard

Signal

Generator

Stereo

Signal

Generator

Frequency

Counter

TUNER

ADJUSTMENT

Dummy

Antenna

(750,

unbalanced

type)

for

FM

e

Oscilloscope

e@

Dummy

Load

(339)

e

Alignment

Tool

e@

Before

performing

the

adjustment,

set

the

unit

as

follows:

*

Function

Switch

......0.0.0..

0

cece

ccecccecceccceececues

RADIO

“

FM

Mode

Switch

........000..0

cece

cccccecceeccccuseues

MONO

*

Tone

SWitch

«2.0.0.0...

ccc

ec

ccec

ec

ceceescccuueueeees

HIGH

*

Volume

Control

.........0..

0

cece

cc

ceccceesceeeecues

Center

Standard

Test

Frequency

400Hz

and

Modulation

30%

at

AM

Connections

Calibration

of IF

INPUT

Connect

standard

loop

antenna

to

output

terminal

of

gene-scope.

Place

loop

antenna

60cm

away

from

bar

antenna.

—_|_.

OUTPUT

Connect

input

terminal

of

gene-

scope

to

detector

output

terminals.

(TP9

or

TP11,

and

TP10)

Frequency

of

Signal

Generator

Tuning

Dial

Setting

Remarks

Adjustments

Obtain

symmetrical

curve

and

maximum

amplitude.

455kHz

Low

End

Calibration

of

Tuning

Range

Adjustment

of

Tracking

Connect

standard

loop

antenna

to

output

of

signal

generator.

Place

loop

antenna

60cm

away

from

bar

antenna.

i

ea

Connect

VTVM

with

330

dummy

load

and

oscilloscope

to

Ext.

Speaker

terminal.

510kHz

Obtain

sine-wave

of

400Hz

and

maximum

amplitude.

1,670kHz

High

End

TC4

(PVC)

600kHz

L3

(bar

ant.

coil)

Max.

1,400kHz

|

1,400kHz

TC3

(PVC)

1

Connections

Alignment

Calibration

of

IF

INPUT

Place

output

of

gene-scope

on

Trap

Coil

(T1).

OUTPUT

Connect

input

terminal

of

gene-

scope

to

detector

output

terminals.

(TP9

or

TP11,

and

TP10)

Standard

test

frequency

400Hz

and

deviation

22.5kHz

Frequency

of

Signal

Generator

Tuning

Dial

Setting

Remarks

Adjustments

Obtain

symmetrical

curve

and

maximum

amplitude.

Turn

T3(blue

core)

fully

counter-

clockwise

T2.

10.7MHz

Low

End

Obtain

S

curve

and

maximum

amplitude.

T3

(blue

core)

Calibration

of

Tuning

Range

Adjustment

of

Tracking

Connect

signal

generator

to

antenna

terminals

(TP1

and

TP2)

through

dummy

antenna

(750,

unbalanced

type).

Connect

VTVM

with

33.0

dummy

load

and

oscilloscope

to

Ext.

Speaker

terminal.

87.2MHz

L2

Obtain

sine-curve

and

maximum

amplitude.

109.0MHz

|

HighEnd

TC2

(PVC)

90MHz

Max.

|

4

90MHz

{

u4

|

106MHz

TC1

(PVC)

Repeat

the

above

adjustment.

TUNER

ADJUSTMENT

(continuea)

Before

performing

the

adjustment,

set

the

unit

as

follows:

3.

Adjust

the

input

measuring

instruments

as

follows:

e@

Function

Select

Switch

...................:::e

cece

eee

ee

RADIO

e

Stereo

Signal

Generator

e@

Band

Select

Switch

...............00..

cece

cence

eee

ee

ees

FM

*

Pilot

Signal

..............

7.5kHz

dev.

(modulation

10%)

@

FM

Mode

Switch

.............0.....

2.

ccc

eee

ee

ees

STEREO

*

Stereo

Signal

.............

67.5kHz

dev.

for

main

signal

@

Tone

Switch

2.00.0...

e

cece

acces

ee

eenenenenes

HIGH

(modulation

90%)

@

Volume

Control

.......0..0..

2c

ccc

cece

ence

eeeeeeeeee

Center

*

Modulation

Frequency

....................

cece

eu

ee

400Hz

e

FM

Standard

Signal

Generator

tone

(V.C.0.)

ADJUSTMENT

*

Signal

Generator

Frequency

.................0.-

98MHz

Connect

the

Frequency

counter

to

the

twelfth

in

IC2

*

Signal

Generator

Output

...............0......045

66dBu

(LA3361).

4.

Set

the

tuning

frequency

to

98MHz.

2.

Adjust

the

potentiometer

(P1)

until

the

oscillation

frequency

of

IC2

becomes

19kHz

(+

20Hz).

5.

Adjust

the

potentiometer

(P2)

by

following

the

Chart

below.

CHANNEL

SEPARATION

ADJUSTMENT

1.

Connect

the

stereo

signal

generator

and

the

FM

standard

signal

generator

through

the

759

dummy

antenna

(unbal-

anced

type)

to

the

antenna

terminals

(TP1

and

TP2)

on

the

Radio

Tuner

P.C.Board

.

NOTE:

Use

an

alignment

tool

with

plastic

grip

for

all

adjustments.

2.

Connect

the

VTVM

with

339

dummy

load

distortion

meter,

and

oscilloscope

to

the

left

channel

terminal

of

the

head-

phone

jack.

Connections

Tuning

Dial

Setting

Remarks

Alignment

Adjustment

OUTPUT

Pilot

(19kHz)

and

Sub

channel

signals

of

Stereo

SG

Maximize

amplitude

of

Oscillo-

scope

and

VTVM

reading

with

FM

Stereo

minimum

distortion.

Signal

Separation

—ON

Connect

measuring

instru-

ments

to

L

channel

R

channel

and

Pilot

Ext.

Speaker

terminal

signal

of

Stereo

SG

Minimize

amplitude

of

Oscillo-

scope

and

VTVM

reading.

—ON

Repeat

the

above

adjustments.

6.

Connect

the

measuring

instruments

to

the

right

channel

terminal

of

the

headphone

jack

and

perform

the

adjustment

by

following

the

Chart

below.

Connections

Tuning

Dial

Setting

Alignment

Adjustment

Remarks

OUTPUT

Pilot

(19kHz)

and

Sub

channel

signals

of

Stereo

SG

Maximize

amplitude

of

Oscillo-

scope

and

VTVM

reading

with

FM

Stereo

—ON

minimum

distortion.

Signal

Separation

Connect

measuring

instru-

ments

to

R

channel

Ext.

Speaker

terminal

L

channel

and

Pilot

signal

of

Stereo

SG

Minimize

amplitude

of

Oscillo-

scope

and

VTVM

reading.

—ON

Repeat

the

above

adjustments.

7.

Repeatedly

perform

the

adjustments

in

Items

5

and

6

to

minimize

the

signal

leakage

for

both

right

and

left

channels.

Then,

reduce

the

difference

between

each

channel

separa-

tion

by

adjusting

the

potentiometer

(P2).

—9—

DIAL

CORD

STRINGING

Mount

the

Drum

on

the

Radio

Chassis

as

illustrated.

Tie

the

dial

cord

of

length

800mm

(effective

length:

770mm)

and

diameter

$0.3

to

the

spring

and

hook

the

spring

to

the

illustrated

position

of

the

drum.

Engage

the

dial

cord

as

illustrated

in

the

following

order.

Drum

—

Pulley

A

—

Pulley

B

—

Tuning

Shaft

(4

turns)

—

Pulley

C

—

Pulley

D

—

Pulley

E

—

Pulley

F

—

Drum

—

Spring

Hook

the

dial

cord

to

the

spring

and

tie

the

cord

where

the

spring

tip

extends

to

the

scratch

mark

as

illustrated.

Pointer

Start

Position

¥

Gaccanae

Rail

PulleyD

Expand

the

spring

to

this

scratch

mark.

5.

Secure

the

place

where

the

spring

is

hooked

to

the

drum

and

the

knot

in

the

dial

cord

with

paint

or

glue.

Turn

the

shaft

of

the

variable

capacitor

counter-clockwise

until

it

stops.

Then,

fit

the

shaft

to

the

drum

and

mount

the

Radio

Tuner

P.C.Board

on

the

Radio

Chassis.

Attach

the

pointer

to

the

dial

cord

and

fit

the

pointer

to

the

starting

position

mark

on

the

pointer

rail

as

illustrated.

Turn

the

tuning

shaft

idly

counter-clockwise

and

confirm

that

the

pointer

is

correctly

positioned.

—»p

Starting

Position

>"

PulleyB

Tuning

Shaft

Sanyo M1990FE User manual

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