Sanyo M9994k User manual

SERVICE

MANUAL

CASSETTE

RECORDER

,

Recording

system

Erasing

system

Tape

speed

Rewind

and

fast

forwardtime

Frequency

range

Terminal

impedance

PHONO:

50k

ohms

(3mV)

SPECIFICATIONS

|

AC

bias,

4

tracks

stereo

|

Frequency

response

—

ACerase

|

=

1-7/8

i.p.s.

(4.75

cm/s)

| |

rae

~

Rewind:

2

min.

(C—60)

a

ae

Output

power

»

Fast

forward:

2

min.

20

sec.

(C—60)

Power

source

-

FM:

87.5

—

108

MHz

AM:

530

—

1605

kHz

_

:

-

‘SWI:

23-—7.0MHz

©

Dimensions

SSW

EOS

OZER

ea

oS

EXT.

MIC:

5k

ohms

(0.3mV)

ss

Weight

50

—

15,000Hz

(CrO,)

50

—

15,000Hz

(FeCr)

60

—

14,000Hz

(NORMAL)

7W

x

2

maximum

DC:

12V

“D”

(UM—1)

x

8

12V

Car

battery

AC:

120/200/240V

50/60Hz

20-3/8"'

(W)

x

5-1/4”

(D)

x

12-1/16"

(H)

(516

x

131

x

306

mm)

Approx.

16

Ibs.

12

ozs.

(7.6

kg)

including

batte

ae

LINE

IN:

180k

ohms

(6GOmV)

|

*

Specifications

subject

to

change

without

notice.

LINE

OUT:

1k

ohms

(0.7V)

|

ca

a

EXT

SP:2.5—8o0hms

—

_

HEADPHONES:

8

ohms

WM

-322

DISASSEMBLY

OF

CABINET

&

CHASSIS

As

a

precautionary

measure,

be

sure

to

unplug

the

power

cord

from

the

4.

Remove

the

six

screws

(209,

pan

head

tapping

3

x

30

mm).

AC

outlet

and

take

the

batteries

out

of

the

battery

compartment.

5.

Disconnect

the

socket

(107)

on

chassis

and

pull

the

chassis

to

the

1.

Remove

the

six

screws

(210,

pan

head

tapping

3

x

35

mm)

of

the

fore

and

upward,

and

it

will

come

out

of

the

cabinet.

rear

cover.

2.

Antenna

socket

is

disconnected

from

the

printed

circuit

board.

3.

Detach

the

following

knobs:

volume

(24,

25),

input

volume

(26,

27)

tone

controls

(28),

and

tuning

(33).

PRIGHT

VOLUME

KNOB)

TUNING

KNOB

ak:

x

@'®

cep

INPUT®

“RIGHT

:

VOLUME)

Ly

LEFT

KNOB

ss

‘

:

ey

Me

TREBLE

cone

KNOB

__

BASSH

209:

SCREW

PAN

HO.

TAPPING

3

30mm

210:

SCREW

PAN

HO.

TAPPING)

3

X35mm

STRINGING

DIAL

ROPE

1.

Preparation

Tie

rope

to

a

spring

coil

(68).

The

rope

should

be

667mm

in

Jength

when

folded

into

two

parts

as

shown

below.

2.

Stringing

procedure

Put

the

rope

round

the

drum

in

the

direction

marked

by

the

arrow

(1),

stretch

it

as

indicated

by

the

arrow

(2),

pass

it

along

(3)-(4)-(5)>

(6)—>(7)-+(8)(9),

wind

it

around

the

tuning

shaft

three

times

at

(10),

and

run

italong

(11)~(12)-(13).

M9S94US

1978.

4,

3.

Adjustment

of

dial

pointer

position.

Turn

the

tuning

shaft

counterclockwise

until

the

dial

rope

slips

on

it.

Set

the

pointer

to

the

graduation

at

the

extreme

ieft

on

the

FM

scale

and

fix

the

pointer

on

the

rope.

3

TURNS

ech

eee

neteer

Pee

enna

Ei

|

x

eee

ne

MODIFICATION

NOTICE

CASSETTE

RECORDER

M9994K

(USA)

M9994K

(AUSTRALIA)

M9994K

Date

June

20,

1979

Issued

by

ee

The

following

corrections

should

be

made

in

the

SERVICE

MANUALS

and

PARTS

(PRICE)

LIST.

Concerning

M9994

Series,

the

IC801,

901

used

in

AMP

PCB

assembly

has

been

modified

as

illustrated

below

in

the

midst

of

production.

Accordingly,

the

capacitance

and

resistance

of

neighboring

parts

and

wiring

are

also

changed.

Since

the

Serial

No.

at

the

time

of

modification

is

not

identified,

please

check

the

pertinent

IC

of

each

set,

and

modify

the

circuit

when

replacing

the

IC

if

necessary.

Ic801,

901

BAS

21

IC

BAS

32

os

©

n

© =

Ae)

=

3

ry

I

|

I

| | | I

| |

|

a

RA

R837,

937

3902

——*

Carbon

2702

#10%

zw

R839,

939

8.2K.

—_—-------

C832,

932

220uF

——

Electrolytic

4/pF

10V

G933,-993

C8394.

935

560pF

——>

Ceramic

270pF

110%

50V

C836,

936

C863,

963

0.0047UF—

-------

C899;.995°

===

——

Ceramic

220pF

+10%

50V

sie

sutures

kepbS

ee

RSS

ett

Aen

EAR

ai

a

Sey.

Sep

oh

A

a

aaah

veto

i

BSR

OR

a

REHEAT

PES

SSIES

SA

SERRE

ROP UES

RATAN

ED

SBR

BADE

NRE

STB

RE

REE

BE

ea

ES

x

3

:

INTERCHANGEABLE

NOT

INTERCHANGEABLE

Serial

No.

Effective

from

Q'ty

of

initial

production

before

modification.

|

Identification

of

modified

unit.

REASON

FOR

MODIFICATION

ie

SU

idles

ap

nae

aaa

a

US

ss

Aa

ene

ad

Reena

A

oe

Standardization

©

tna

improvement

of

reliability

EB

.

suas's

Miss print

G

...

Bou...

Change

of

materials

OD.

.....

Improvement

of

performance

F

.....

Miss

register

SANYO

ELECTRIC

TRADING

CO.,

LTD.

WM-

4153

Printed

in

Japan

S000

OSAKA,

JAPAN

cud

tanto

tHE

EUROS:

C832

C833

220p

0.1

ee

47/10V

R840

1K

a

R840

1K

R841

82K

RB41

82K

sac

Set

cals

aici

Se

Sih

$s

TN

SRE

St

To

ae

RA

AUER

eg

BE

Ba

ee

Bg

Ee

Se

Oe

oe

ee

eae

eee

EE

eR

Ec

ae

cette

ee

abs

Spanier

Told

fi

eRe

SR

Bx

SS

En

BEG

S

eo

Bits

IE

ERLE

SREB

ERE

GHEE

GIS

Bis

LETRA

BY

SEEDS

ii

SED

RR

SIEBOT

et

Ea

REO

ace

a

Retaseb

NAS

a

Tce

ech

enone

ctv

Ri

cians

TORQUE

ADJUSTMENT

TAPE

SPEED

ADJUSTMENT

1.

Set

the

unit

to

the

PLAY,

FAST.FORWARD

or

REWIND

mode.

1.

Connect

a

frequency

counter

to

the

Ext.

Speaker

jack.

2.

Measure

the

each

torque

with

a

torque

gauge.

They

should

be

as

2.

Mount

a

3

kHz

test

tape

on

the

unit

and

play

it

back.

Turn

tl

following;

potentiometer

inside

the

motor

and

adjust

it

until

the

counter

rea

PLAY

35

—

60

g/cm

ing

becomes

2970~3020Hz.

FAST

FORWARD

60

—

100

g/cm

REWIND

65

—

100

g/cm

3.

If

the

each

torque

fails

to

reach

the

standard

value.

Clean

the

drive

HEAD

AZIMUTH

ADJUSTMENT

belt,

flywheel,

motor

pulley,

take-up

reel,

idler

and

rewind

roller

1.

Mount

a

music

tape

on

the

unit

for

the

reproduction

of

tape.

Inse

with

a

cotton

swab

soaked

in

alcohol.

the

screw

driver

(+)

to

azimuth

hole,

and

turn

the

azimuth

adjusti!

screw

until

to

the

maximum

sound.

PINCH

ROLLER

ADJUSTMENT

1.

Set

the

unit

the

Play

mode.

2.

Apply

a

tension

gauge

(500

gr)

to

the

pinch

roller

and

measure

the

pressure.

The

gauge

reading

should

be

within

the

range

300

—

400

gr.

3.

To

adjust

the

contact

pressure,

bend

the

spring

or

change

the

spring

with

a

new

one,

if

necessary.

ADJUSTMENT

OF

STAND-BY

MECHANISM

(RESULTANT

FORCE

OF

LOCK-LEVER

SYSTEM)

The

lever

of

the

slide

(445)

has

to

be

unlocked

with

the

revolving

shaft

of

the

pulley

(443)

kicking

it

before

the

stand-by

mechanism

works.

Employ

a

spring

gauge

capable

of

measuring

a

force

of

up

to

110

g

for

making

this

adjustment.

Resultant

force

of

lock-lever

system

.....

100g

or

smaller

In

the

event

that

the

resultant

force

is

larger

than

the

above

specification,

adjust

by

bending

or

replace

the

spring

coil

331

(141-2-851T-56100).

j

‘

;

i

'

a

‘

4

{

|

:

j

;

4

AUTO

STOP

MECHANISM

(Read

this

section

in

reference

to

the

mechanical

exploded

view

on

Page

14

&

15)

Theory

of

operation

When

the

end

of

tape

has

been

reached

in

the

REC

or

PLAY

mode,

the

PLAY

button

is

unlocked

and

operation

stops

automatically.

1.

Auto

stop

and

worm

gears

(3)

(4)

keep

revolving

while

the

motor

is

running.

FLYWHEEL

(1)

GEAR

(3)

\

———-

WARM

GEAR

(4)

2.

While

the

tape

is

running

1)

Take-up

reel

(7)

causes

relay

gear

(6)

to

turn.

Auto

stop

pulley

mounted

on

the

shaft

of

relay

gear

(6)

also

turns

in

the

sarne

direction.

2)

While

flywheel

(1}

is

turning,

it

keeps

the

rear

end

of

auto

stop

slide

(9)

moving

on

the

cam

of

auto

stop

gear

(3).

Therefore,

it

does

not

become

engaged

with

hook

(5)

on

auto

stop

pulley

(8),

so

the

auto

stop

mechanism

does

not

work.

3.

When

the

tape

end

has

been

reached

1)

Take-up

reel

stops

revo!ving.

So

does

the

rear

end

of

auto

stop

slide

(9).

2)

Hook

(5)

on

auto

stop

pulley

(8)

catches

the

rear

end

of

auto

stop

slide

(9)

which

is

pulled

toward

the

motor,

unlocking

the

PLAY

button.

AUTO

STOP

PULLEY

HOOK

(5)

AUTO

STOP

GEAR

(3)

/

RELAY

SCENES)

ee

cue

\\

Bey

!

|

AUTO

STO

PULLEY

(8)

=a)

jap

are

STOP

SLIDE

(9)

4.

When

the

PAUSE

button

is

locked

Auto

stop

pause

spring

(12)

keeps

pushing

the

rear

end

of

auto

stop

slide

(9)

against

the

cam

of

auto

stop

geat

(3).

Accordingly,

the

rear

end

of

auto

stop

slide

(9)

moves

on

the

cam

and

remains

out

of

reach

of

hook

(5)

on

auto

stop

pulley

(8).

Thus,

the

auto

stop

mechanism

does

not

work.

I

AUTO

STOP

|

SL

IDE

(9)—e

AUTO

STOP

LEVER

(10)

|

_

AUTO

STOP

PAUSE

SPRING

(12)

—

O

eo——

PAUSE

BOTTON

(13)

despa

aR

nt

ihe

EAB

arbi

Rings

seats,

BRD

Lieb

RAE

REET

SERED

tS

ARBAB

ESS

snag

vg

fe

Seth

ann

eaP

SRE

Sokelnniea

ADJUSTMENT

OF

AMPLIFIER

SECTION

ADJUSTMENT

OF

RECORDING

GAIN

ADJUSTMENT

OF

PLAYBACK

GAIN

Playback

test

tape

(1kHz,

OdB)

and

adjust

SVR701

(50KB)

to

equalize

outputs

at

LINE

OUTs

for

the

left

and

right

channels.

Conditions:

Automatic

level

control

(ALC)

+

ON

PREPARATION

Volume

controls

(VOLUME)

+

MIN.

|

All

necessary

adjustments

should

be

made

at

a

source

power

voltage

of

Mode

selector

(MODE)

~

STEREO

:

DC12V.

insert

blank

tape,

set

the

unit

in

the

recording

mode

and

apply

1kHz—

Turn

the

TONE

controls

(BASS

and

TREBLE)

to

their

center

positions

25dB

(S5mV)

signal

to

the

LINE

IN

jacks.

|

and

the

INPUT

VOLUME

controls

(left

and

right

channels)

to

their

Connect

a

VTVM

to

the

collectors

of

Q807

and

Q907

and

adjust

SVR

maximum

settings.

702

until

left-

and

right-channel

outputs

become

identical.

The

settings

of

other

controls

are

as

follows:

Function

switch

(FUNCTION

1)

+

TAPE

Input

line

switch

(FUNCTION

2)

>

LINE

Tape

selector

(TAPE)

-

NORMAL

ADJUSTMENT

OF

METERS

Conditions:

Automatic

level

control

(ALC)

—

ON

Mode

selector

(MODE)

-~

STEREO

Playback

test

tape

(1kHz,

OdB)

and

turn

the

volume

control

(VOLUME)

until

the

reading

of

the

meter

for

the

right

channel

becomes

2W

(OVU).

Adjust

SVR703

until

the

meter

readings

for

the

left

and

right

channels

become

identical.

TEST

TAPE

ADJUSTMENT

OF

ALC

Conditions:

Automatic

level

control

(ALC)

—

ON

Volume

controls

(VOLUME)

—

MIN.

Mode

selector

(MODE)

—

STEREO

|

After

finishing

with

adjusting

the

recording

gain

as

instructed

in

(4

above,

insert

blank

tape,

set

the

unit

in

the

recording

mode,

and

appl)

1kHz—5dB

(1.7V)

signal

to

the

LINE

IN

jacks.

Connect

a

VTVM

to

the

collectors

of

Q807

and

Q907.

Adjust

SVR70:

to

obtain

identical

outputs

from

the

left

and

right

channels.

SVR

701

¢

SVR

702

©

SVR

703

|

METER

ADJ

ADJUSTMENT

OF

BIASES

Mount

blank

tape

and

set

the

unit

in

the

recording

mode,

while

connect-

ing

a

VTVM

to

the

10-ohm

terminals

of

R845

and

R945.

Adjust

SVR801

and

SVR901

until

the

VTVM

stands

at

3.5mV.

ADJUSTMENT

OF

TUNER

SECTION

ADJUSTMENT

OF

TUNING

METER

Supply

98MHz,

80dB

(10mV)

signal

from

an

FM

signal

generator

to

the

unit

at

TP1

(HOT

side)

and

TP2

(GROUND

side),

tune

the

unit

to

the

receiving

frequency

and

adjust

SVR301

so

the

meter

needle

points

to

9.5.

FM

SIGNAL

GENERATOR

OL)

O

Roa

O

G

=i

TUNING

"6

>

KS

Cyseits

fy

SS

il

“SVR301

[ey

~S_

oA

ADJUSTMENT

OF

FM

MULTIPLEX

(1)

Set

SVR501

(10KB)

to

its

center

position.

(2)

Adjust

the

modulation

of

the

FM

signal

generator,

using

a

stereo

modulator.

*Modulation

frequency

=

400Hz

Pilot

signal

7.5kHz

dev.

(10%

modulation)

Stereo

signal

Main

signal

22.5kHz

dev.

(30%

modulation)

NOTE:

Adjustment

of

modulation

varies

according

to

the

type

of

instru-

ment

in

use.

You

are

encouraged

to

know

fully

well

the

operation

of

the

instrument

you

are

employing.

STEREO

MODULATOR

+

|MPX

OUTPUT

FM

SIGNAL

GENERATOR

FREQUENCY

COUNTER

(3)

Connect

an

IHF

filter

(200~15kHz)

to

the

left-channel

LINE

OUT.

Connect

the

filter

toa

VTVM.

(4)

Set

the

output

signal

switch

of

the

stereo

modulator

to

MAIN

(L+R).

Set

the

unit

to

receive

a

radio

frequency

of

98MHz

and

tune,

using

the

FM

signal

generator.

(5)

19kHz

adjustment

(VCO

adjustment)

Set

the

radio

unit

so

there

is

no

input

in

the

FM

stereo

mode.

Con-

nect

a

frequency

counter

to

TP3

and

make

necessary

adjustment

by

means

of

SVR501

(10KB)’so

that

the

counter

reading

becomes

19kHz

+

100Hz.

*HOT

side

of

frequency

counter:

TP3

GROUND

side

(E):

shield

case

(6)

Separation

adjustment

1)

Connect

a

300-ohm

dummy

load

to

an

FM

signal

generator

and

the

dummy

load

to

the

unit,

to

TP1

on

the

HOT

side

and

to

TP2

on

the

GROUND

side.

Set

the

output

signal

switch

of

the

stereo

modulator

to

MAIN

(as

in

Section

(4)

above)

and

supply

pilot

signal.

Set

the

BASS

and

TREBLE

controls

to

their

center

positions

and

regulate

the

stereo

signal

input

to

66dB.

Then,

reduce

the

distortion

factor

to

a

minimum

by

tuning,

using

the

radio

tuning

control

or

by

means

of

the

FM

signal

generator.

Adjustment

of

left-channel

separation

Set

the

output

signal

switch

to

RIGHT

and

minimize

leakage

of

right-channel

signal

into

the

left

channel

by

adjusting

SVR502

(500B).

Adjustment

of

right-channel

separation

Reconnect

the

cord

from

the

IHF

filter

from

the

LEFT

to

RIGHT

LINE

OUT

jacks,

set

the

output

signal

switch

to

LEFT

and

minimize

leakage

of

left-channel

signal

into

the

right

channel

by

adjusting

SVR502

(500B).

In

case

the

minimum

signal

leakage

positions

of

SVR502

adjusted

as

instructed

in

Sections

(4)

and

(5)

differ

from

each

other,

determine

its

optimum

position

within

a

range

that

satisfies

the

specified

separation

value

(20dB

or

higher)

for

each

of

the

two

channels.

*

In

the

above-described

steps

of

adjustment,

tuner

output

is

taken

out

at

LINE

OUT.

The

IHF

filter

(BANDPASS

200~

15000Hz)

can

be

dispensed

with

when

connections

are

made

to

EXT-SP.

2

—

3

—

4

—

5

~——_

6

—

DISTORTION

IHF

FILTER

ASS

os

MW

ADJUSTMENT

Leet.

455

KHz

Low

end

of

dial

scale.

(400

Hz

30%

|

At

position

of

un-

a

MAX.

modulation)

required

signal.

505

KHz

(400

Hz

;

30%

modulation)

Low

end

of

dial

scale

L112

MAX.

1650

KHz

(400

Hz}

,,.

:

30%

modulation)

High

end

of

dial

scale

600

KHz

(400

Hz

:

30%

modulation)

600

KHz

on

dial

scale

L109b

MAX.

1400

KHz

(400

Hz

:

30%

modulation)

1400

KHz

on

dial

scale

PREPARE:

1.

Set

the

dial

pointer

to

very

left

line

of

dial

scale.

3.

Selector

switch

to

“MW”.

2.

Connect

sweep

generator,

AM

SG,

VTVM

and

oscilloscope.

4.

Use

a

screwdriver

with

plastic

grip

for

all

adjustments.

geist

J

T301,

T302

XB

T303

-

75

kerta,

87.0

MHz

(400

Hz

§

dial

scal

30%

modulation)

Rowing

Onelelscae

L107

MAX.

109.0

MHz

(400

Hzj,,.

:

40%

macdulation]

High

end

of

dial

scale

90.0

MHz

(400

Hz

:

30%

modulation)

90.0

MHz

on

dial

scale

L105

-

x.

106.0

MHz

(400

Hz

;

30%

modulation)

106.0

MHz

on

dial

scale}

CT1

Connect

sweep

Connect

oscillo-

generator

to

scope

to

EXT.

SP

Test

Loop.

terminals

Connect

AM

SG

to

Test

Loop.

Connect

VTVM

to

speaker

terminals.

Connect

AM

SG

to

Test

Loop

Connect

VTVM

to

speaker

terminals.

FM

ADJUSTMENT

Adjusting

Circuit

0.S.C.

VTVM

Oscilloscope

SG

frequency

Position

of

tuning

dial

Connect

oscillo-

scope

to

test

point

TP6,

R319(H)

Shield

cast

(E)

Connect

sweep

generator

to

FM

TP1

(H)

&

TP2

(E)

Near

max.

capacity

of

VC.

at

position

with

unrequired

signal.

10.7

MHz

(0%

modulation)

Connect

oscillo-

scope

to

test

point

TP7,

R324(H)

Shield

case

(E)

Connect

FM

SG

to

TP1(H)

&

TP2

(E)

Connect

VTVM

to

speaker

terminal.

Connect

FM

SG

to

TP1

(H)

TP2

(E)

Connect

VTVM

to

speaker

terminal.

-

_

7

Repeat

adjustments.

PREPARE:

1.

Set the

dial

pointer

to

very

left

line

of

dial

scale.

112.5

ohm

2.

Connect

sweep

generator,

FM

SG,

VTVM

and

oscilloscope.

FM

antenna

input

impedance

is

300

ohm.

e

3.

Use

a

screwdriver

with

plastic

grip

for

all

adjustments.

§

4.

AFC

switch

OFF.

Te)

*

Because

an

AFC

is

incorporated,

FM

tracking

and

frequency

coverage

adjustments

have

to

be

made.

5

Use

a

small

input

(about

10dB)

for

this

purpose.

150

ohm

SW1

ADJUSTMENT

Aajuating

Cireuit™

[Tope

|

Outout

|

1

2,2

MHz

(400

Hz

;

30%

modulation)

Low

end

of

dial

scale

L111

pm

Connect

AM

SG

Connect

VTVM

to

tat

ose

to

Test

Loop.

speaker

terminals.

2

7.2

MHz

(400

Hz

|

,,.

30%

modulation)

|

High

end

of

dial

scale

CT6

2.5

MHz

(400

Hz

.

30%

modulation)

2.5MHz

on

dial

scale

L109a

6.5

MHz

(400

Hz

;

30%

modulation)

6.5MHz

on

dial

scale

fe

ec

Repeat

adjustments.

PREPARE:

1.

Set

the

dial

pointer

to

very

left

line

of

dial

scale.

3.

Selector

switch

to

‘‘SW1”.

2.

Connect

sweep

generator,

AM

SG,

VTVM

and

oscilloscope.

4.

Use

a

screwdriver

with

plastic

grip

for

all

adjustments.

5.

Set

the

Fine

Tuning

to

mechanical

center.

Connect

AM

SG

to

Test

Loop.

Connect

VTVM

to

speaker

terminals.

ea

a“

SW2

ADJUSTMENT

Adjusting

Se.

ee

ace

Circuit

[Input

[Output

|

_S@ereavency

|

Postion

of

tuning

diel

|

Adlurment

|

oscilloscope

OSC

at

_

COME

Genin

Connect

VTVM

to

iain

erage

ee

eon

tgefe

High

end

of

dial

scale.

CTs

Sa

i

eel

21.0MHz

on

dial

scale.

Connect

AM

SG

to

ANT

terminal

through

IRE

dummy.

Connect

VTVM

to

EXT.

SP.

terminals.

Repeat

adjustments.

PREPARE:

1.

Set

the

dial

pointer

to

very

left

line

dial

scale.

4.

Selector

switch

to

‘““SW2”’.

-—O

2.

Connect

signal

generator

to

dummy

antenna.

5.

Set

the

Fine

Tuning

to

mechanical

center.

10pF

3.

Use

screwdriver

with

plastic

grip

for

all

adjustments.

6.

Use

a

Dummy

antenna

as

follow.

50

ohm

fer

eae

1

sie

ent

ASE

AE

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Sanyo M9994K User manual

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