Sanyo M9998LU Manual de usuario

SERVICE

MANUAL

CASSETTE

RECORDER

(METAL

TAPE)

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SPECIFICATIONS

recording

system

AC

bias,

4-track

stereo

Erasing

system

AC

erase,

2-track

Tape

speed

4.75

cm/sec

(1-7/8

i.

p.s.)

Rewind

and

fast

forward

time

Rewind:

7

min.

35

sec.

(C—60)

Fast

forward:

1

min.

50

sec.

(C—60)

Frequency

range

FM:

67.5

—-

108MHz

SW:

5.95

-

18MHz

MW:

5265

—

1,605KHz

LW:

150

—

285KHz

Terminal

impedance

MIC:

16

kohms

(0.3mV)

PHONG:

50

kohms

(8mV}

REC/PB:

(input)

10

kohms

(1mV)

(output)

2.7kohms

(0.5V)

EXT

SP:

4

—

8

ohms

PHONES:

8

onms

Frequency

response

40

—

12,000Hz

(NORMAL)

40

—

15,000Hz

(CrO,}

40

—

16,000Hz

(METAL)

Signal

to

noise

ratio

59

dB

(Dolby

NR

ON)

50

dB

(Dolby

NR

OFF)

Output

power

12W

x

2

maximum

(music

power)

Power

source

DC:

15V

“DD”

(UM—1)

x

10

12--15V

Car

battery

adaptor

AC:

115/230V,

50/60Hz

Dimensions

664(W)

x

175(D)

x

267(H)

mm

(26-3/16"

x

6-15/16"

x

10-9/16’)

Weight

Approx.

9

kg

(19

lbs.

14

ozs.)

including

batteries

Specification

subject

to

change

without

notice.

WM-5659

DISMOUNTING

OF

CABINET

AND

CHASSIS

In

the

first

place,

take

the

batteries

out

of

the

battery

case,

or

pull

off

the

power

cord.

(7)

Removing

the

back

lid

Take

off

8

screws

(pan

head

tapping

screws

3

x

40

mm)

from

the

back

lid

(of

which

two

are

found

in

the

battery

case).

Open

the

back

tid,

with

care

not

to

break

the

leads

inside.

Disconnect

the

lead

sockets

of

the

set’s

PCBs

from

the

back

lid’s

PCBs.

Back

lid

side

Set

side

Beat

cancel

2P

A

Oscillation

PCB

(Brown

socket)

Speaker

selection

2P

-

B

Front

socket

PCB

(Gray

-brown

socket)

f

xternal

speaker

4p

C

Speaker

.

(Red-black-brown-orange

socket)

2P

D

Amp

PCB

(Red-white

socket)

Line

out

4p

~-

E

Amp

PCB

(Gray-brown

socket)

Rod

antenna

socket

1Px2

F

Tuner,

switch

PCB

(Blue-brown

socket}

Bandy

cord

5P

G

Amp

PCB

4P

-

H

Amp

PCB

5P

|

Tuner,

switch

PCB

(Blue-gray-brown-red

sock-

et)

Power

supply

PCB

J

AMSS

PCB

By

removing

these

10

sockets,

the

back

lid

can

be

taken

off.

(2)

Removing

the

Cabinet

Remove

ali

control

knobs

and

levers.

Pick

up

power

button

and

battery

check/dial

light

button,

and

turn

them

clockwise

and

counterclockwise

(sketch)

respec-

tively,

then

these

buttons

will

be

locked

in

raised

positions,

Take

off

4

red

screws

(3

pan

head

tapping

screws

3

x

30

mm,

1

pan

head

tapping

screw

3

x

40

mm)

which

are

joining

the

chassis

and

the

cabinet

together.

Sepearate

the

microphone

socket

from

the

amplifier

PCB,

and

remove

screw

209

(pan

head

tapping

screw

3

x

8

mm)

from

the

oscillation

PCB

(110).

Disconnect

the

three

sockets

of

LED

PCB

(106)

from

the

AMSS

PCB

(107).

Lifting

the

chassis

a

little,

dismount

the

chassis

from

the

cabinet.

Now,

the

chassis

and

the

cabinet

are

separated

from

each

other.

A

eee

Pan

Head

Tapping

Screw

3

x

30mm

B

.....

Pan

Head

Tapping

Screw

3

x

40mm

(3)

Removing

the

printed

circuit

board

*

Before

checking

or

repairing

the

AMP

PCB

or

tuner/

(Referring

only

the

AMP

PCB

and

tuner/switch

PCB)

switch

PCB,

make

sure

other

smaller

PCBs

(INPUT

PCB,

OUTPUT

PCB,

OSCILLATION

PCB,

AMSS

Amplifier

PCB

PCB,

VR

PCB)

are

properiy

connected.

To

dismount

the

AMP

PCB,

take

off

5

screws

(pan

head

tapping

screw

w/washer

3

x

12

mm)

and

2

lugs,

136

and

138

(for

shaping

up

the

leads),

from

the

chassis.

Since

the

AMP

PCB

is

connected

to

the

tuner/

switch

PCB

with

plugs,

it

can

be

separated

off

by

pull-

ing

it

toward

you.

NOTE:

When

mounting

the

AMP

PCB,

assemble

with

care

so

that

the

AMP

side

plug

may

be

fitted

well

with

the

tuner

side

socket.

Switch/tuner

PCB

j

After

dismounting

the

AMP

PCB,

take

off

three

screws

(a

pan

head

tapping

screw

w/washer

3

x

8

mm,

two

pan

head

tapping

screws

3

x

8

mm)

from

the

tuner/

switch

PCB.

Remove

the

hexagon

head

bolt

(2.6

x

16

mm)

from

the

dial

drum

(66)

and

separate

the

spring

coil

(67)

for

rope

threading

from

the

drum.

Glue

with

adhesive

cellophane

tape,

and

pull

toward

the

outside,

then

the

switch/tuner

PCB

will

come

out

loose.

Pull

out

the

PCB

along

the

chassis

groove

with

care

not

to

damage

the

leads,

then

the

disassembly

is

complete.

TUNER

SW

PCB

'

i

Pt

\L

dos.

220

NOTE:

When

dismounting

the

tuner/siwtch

PCB,

be

careful

©

not

to

separate

the

connection

bandy

cord

from

the

amplifier

PCB.

NOTE:

When

reassembling

the

chassis

into

cabinet,

arrange

the

leads

aming

from

the

VR

PCB

as

illustrated

above.

\\

Unless

arranged

as

specified,

the

cahssis

may

not

settle

home

in

the

cabinet

or

the

leads

may

be

pinched

and

cut

by

the

chassis

and

cabinet.

pais

AMSS:

HOW

DOES

IT

WORK?

AMSS

stands

for

Automatic

Music

Select

System,

and

it

is

intended

to

search

for

the

start

of

a

desired

music

auto-

matically

by

making

use

of

the

unrecorded

(no-signal)

segment

between

recorded

tunes

in

a

pre-recorded

music

tape.

Method

of

use

A.

In

playback

mode,

to

skip

the

tuner

being

reproduced

and

play

back

the

(1)

Press

AMSS

button.

(The

button

is

locked.)

(2)

Press

FF-Cue/AMSS

button.

(This

button

is

locked

to

fast-forward

the

tape.

At

this

time

AMSS

indicator

flickers

to

tell

the

tape

running

direction.)

(3)

Reaching

the

end

of

the

tune

being

reproduced,

the

FF-Cue/AMSS

button

only

is

reset

auto-

matically,

and

the

playback

of

the

next tune

is

started

after

running

through

the

unrecorded

segment.

In

playback

mode,

to

repeat

the

tune

being

reproduc-

ed:

(1)

Press

AMSS

button.

(The

button

is

locked.)

(2)

Press

REW-Review/AMSS

button.

(This

button

is

locked

to

rewind

the

tape.

At

this

time,

the

other

AMSS

indication

flickers

to

tell

the

tape

running

direction.)

(3)

Returning

to

the

start

of

the

tune

being

reproduc-

ed,

the

REW-Review/AMSS

button

only

is

reset

automatically,

and

the

playback

of

the

same

tune

is

repeated

immediately.

In

playback

mode,

to

skip

several

tunes

to

search

for

a

desired

one:

(1)

Manipulate

as

in

A-(1).

(2)

Manipulate

as

in

A-(2)

and

A-(3)

repeatedly

until

the

desired

tune

is

located.

R745

10K

R746

220K

foes

se

$632

(REW)

O

C717

2.2/25V

0726

15188

AM

R726

56

R752

3.3K

Q712

2S

C536F

AMSS'ON"

iTEM"C’

POSITION

ITEM'S!

POSITION

/

ITEM"A'@'C”

POSITION

/

RECORDED

LEVEL

----

:

/

|

PRESENT

MUSIC

4

MUSIC

NON-RECORD

LEVEL

----------

;

tL

REWIND

FAST

FORWARD

Circuit

description

Main

behavior

Playback

signals

from

the

head

are

detected

in

the

level

detector

circuit.

When

unrecorded

level

is

found,

a

single

shot

pulse

is

generated

to

operate

the

plunger.

Briefing

on

circuits

(1)

(2)

Pressing

of

play

button

will

cause

switch

S611

to

turn

on.

Pressing

of

AMSS

button

will

cause

switch

S601

to

close.

When

FF-Cue/AMSS

or

REW-Review/AMSS

button

is

pressed,

switch

S623

or

S633

will

close.

Then,

voltage

Vcc

is

supplied

into

circuits.

Transistors

Q703,

Q704

are

astable

multivibrator

circuits;

when

switch

S623

or

S633

is

closed,

the

power

is

supplied,

and

the

circuit

is

activated

to

be

in

oscillating

state,

while

either

LED

(D705

or

D706)

of

tape

running

direction indicator

flickers

according

to

the

switch

operation.

Diodes

D707,

D708

are

intended

to

prevent

over-current.

D705

SLP239B

$623(F.Fwo)

(re)

R733

180K

POWER

SUPPLY

4.7K

_0S442

R770

D724

C7i9

4.7

/10V

¢

Q713

Q708

2SC536

2S0612E

(3

(10)

(11)

In

playback

mode,

the

audio

sources

(playback

signals)

detected

by

right

and

left

heads

are

fed

into

(G)

and

(H)

by

way

of

tape

equalizer

amplifier

and

Dulby

amplifier.

When

FF-Cue/AMSS

or

REW-Review/AMSS

button

is

pushed

in,

switches

S621,

S622,

or

S631,

S632

are

closed.

Transistor

Q712

amplifies

the

audio

sources

in

the

AF

{audio

frequency)

amplifier.

Capacitor

C731

and

resistor

R730

compose

a

low-cut

filter

in

order

to

eliminate

the

low

frequency

compo-

nents

of

audio

sources.

1C703

comprises

circuits

for

AM

amplifier,

AC-DC

converter,

comparator

and

others,

being

designed

to

amplify

the

audio

sources

again,

detect

the

level,

and

form

pulses.

The

following

waveforms

are

delivered

to

terminals

No.

2

(C,

R)

and

No.

6

(Tr-Out).

Transistor

Q706

is

switched

on

and

off

due

to

the

differential

voltage

of

emitter

and

base,

composing

single-shot

pulse

in

the

collector.

Times

ty,

t3

are

set

by

the

time

constant

of

capacitor

C718

and

resistor

R733.

Transistor

O713

prevents

erroneous

actions

in

switch

operations

in

the

muting

circuit.

Transistors

O707

and

Q708

are

linked

by

Darlington

connection,

of

which

single-shot

pulses

of

small

current

are

used

to

drive

the

plunger.

When

the

plunger

starts

to

move,

the

stide

(123)

of

the

mechanism

is

pulled,

so

that

the

FF-Cue/AMSS

or

REW-Review/AMSS

button

locked

in

item

(1)

will

be

reset.

Diode

D709

is

designed

to

prevent

counter-electromo-

tive

current

during

plunger

movement.

BRAKING

POINT

TAPE

LEVEL

r

TAPE

RUNNING

9

20°00

44"

=

DIREC

TION

t

ee

[os

TERMINAL

;

Q706

EMITTER

'

th

3

TERMINAL

@)

‘

:

Sows

M6

RAN

1

Q?06

COL

LECTOR

RIGHT

CHANNEL

AMP

PCB

AMPLIFIER

ADJUSTMENTS

Prepare

Power

source

...........

02s

eee

DC

15V

Mode

switch

..........00

00

eee

e

eee

STEREO

Dolby

NR/ALC

switch

............006.

OFF

Selector

switch...

0...

ee

TAPE

Fape

switch.

eo

essing

ee ea

all

ae

acts

NORMAL

Loudness

switch...

0...

..

2.0.00

eee

OFF

Head

azimuth

Tape

to

be

used;

(10

kHz,—10

dB)

Load

a

test

tape

and

press

the

PLAY

button.

Adjust

the

head

azimuth

screw

so

the

LINE

OUT

level

becomes

maximum.

Repeat

the

adjustment

on

both

cahnnels

and

both

sides

of

aVIVM

MAX”

set

Adjustment

of

playback

level

Play

back

Dolby

test

tape

MTT-115

OdB

(TEAC

Dolby

level

calibration

tone

200

nWb/m).

Adjust

controls

SVR801

(L-ch)

and

SVR901

(R-ch)

until

the

output

level

from

measuring

test

point

becomes

0.58

V.

*

Measuring

test

point

means

...

The

line

(common

terminals

of

record/playback

switch

of

$806

and

S906)

on

point

7

of

Dolby

IC

(LM1011N

Dolby),

1C801,

1C901,

and

the

ground.

LEFT

CHANNEL

Adjustment

of

record/playback

frequency

response

(Bias

adjustment)

Feed

input

signal

of

5

mV

(—46

dB)

1

kHz

into

the

line

input

terminal.

Turn

the

input

control

knob

until

the

output

at

measuring

test

points

(see

above)

becomes

40

mV.

Under

this

condition,

turn

SVR701

and

SVR702

until

the

difference

between

record

output

playback

output

becomes

0

whether

the

signal

is

1

kHz

or

10

kHz.

NOTE:

When

adjusting,

set

the

signal

of

line

input

at

“OFF”

state.

ARO

OGL

Wf

i

ATTENUATOR

a)

)

Ss

4

=

;

gi

Adjustment

of

record

and

playback

levels

Feed

input

signal

of

50

mV

(—26

dB)

1

kHz

into

the

line

input

terminal.

Turn

the

input

control

knob

until

the

output

at

measuring

test

points

(see

above)

becomes

0.58

V.

Record,

Adjust

SVR802

and

SVR902

so

that

the

record

input

becomes

equal

to

the

playback

output.

NOTE:

When

playing

back,

set

the

signal

of

line

input

at

“OFF”

state.

|

~

|

~\\

i

ATTENUATOR

Jo

cH)

ad

Hl

-

<

oe

ol

BBS

QO

-

Adjustment

of

ALC

balance

Turn

on

ALC

switch.

Feed

input

signal

of

500

mV

(—6

dB)

into

the

tine

input

terminal.

Set

in

record

mode.

Adjust

by

turning

SVR703

until

levels

at

measuring

test

points

become

uniform.

Adjustment

of

tuning

meter

Feed

input

signal

of

98

MHz,

66

dB

into

the

set.

Tune

in

the

reception

frequency

of

the

set.

Adjust

SVR301

(10

kB)

so

that

the

meter

swings

up

to

graduation

9.5.

(1)

If

the

meter

swing

becomes

larger

as

the

input

is

being

increased,

adjust

after

raising

the

input

until

the

meter

is

stabilized.

(2)

If

the

maximum

point

of

meter

swing

does

not

coin-

cide

with

the

maximum

output

point,

turn

off

AFC

switch

(to

short-circuit

TP4

and

shield

case),

and

tune

in

to

the

maximum

point

of

meter

swing.

In

this

set-

ting,

adjust

T303

to

obtain

the

maximum

output.

At

this

time,

keep

the

input

at

50

dB,

Adjustment

of

FM

MPX

(multiplex)

(1)

Set

SVR501

(10

kB)

in

the

central

position.

(2)

Apply

modulation

input

into

FM

SG

through

stereo

modulator.

(*

Modulation

frequency

is

400

Hz.)

Pilot

signal

7.5

kHz

dev.

(10%

mod.)

Stereo

signal

22.5

kHz

dev.

with

“‘main’’

signal

(30%

mod.}

NOTE:

Since

the

method

of

adjusting

the

modulation

differs

from

one

instrument

to

another,

learn

the

method

for

the

instrument

you

are

going

to

use.

(3)

Keeping

thé

output

signal

switch

of

stereo

modulator

at

MAIN

(L

+

R),

set

the

radio’s

reception

frequency

to

98

MHz,

and

tune

in

with

FM

SG.

(*

Output

of

FM

SG

is

66

dB.)

(4)

19

kHz

adjustment

(V.C.O.

adjustment)

in

FM

stereo

mode,

connect

frequency

counter

to

TP6,

and

cut

the

output

of

stereo

modulator

to

set

in

no-

modulation

state.

Turn

SVR501

(10

kB)

to

adjust

to

19

kHz

+

50

Hz.

*

No-modulation

state:

Turn

off

PILOT

and

MAIN

&

SUB

of

output

signal

switch.

Adjustment

in

no-input

state

is

difficult

because

19

kHz

signals

fluctuate

due

to

noise

component,

but

it

is

possible

to

adjust

in

away

that

the

average

of

indications

be

19

kHz

+

50

Hz.

(5)

Adjustment

of

separation

THREADING

OF

DIAL

ROPE

(a)

Turn

tone

controls

to

minimum.

Set

the

balance

control

in

the

middle

point.

Preparation

(b)

Turn

on

MAIN

&

SUB

signal

switch

and

PILOT

Tie

the

rope

to

spring:

coil

(67)

of

drum

(66)

in

a

folded

signal

switch,

and

set

the

output

signal

switch

to

length

of

512

mm.

“MAIN”

position.

(c)

Connect

VTVM

to

external

sepaker

terminal.

(Connect

to

right

and

left

jacks

of

external

speaker

terminal

recording

to

the

adjustment

or

right

and

left

channels.)

(d)

Turning

volume

controls,

adjust

the

output

of

both

right

and

left

channel

to

the

standard

output

(50

mW).

(e)

Turn

on

the

RIGHT

side

and

turn

off

the

LEFT

side

of

output

signal

switch.

Adjust

SVR502

(1

kB)

so

as

to

minimize

the

LEFT

side

leakage

output.

(f)

Turn

on

the

LEFT

side

and

turn

off

the

RIGHT

side

of

output

signal

switch.

Adjust

SVR502

so

as

to

minimize

the

RIGHT

side

leakage

output.

If

the

position

of

adjustment

coin-

cides

with

that

in

item

5)

above,

this

is

the

comple-

tion

of

adjustment.

(g)

If

the

position

of

adjustment

of

SVR502

differs

from

the

right

channel

to

the

left

channel,

adjust

so

that

the

separation

of

both

channels

becomes

nearly

equal

to

each

other.

NOTE:

Separation,

in

both

channels,

should

be:

More

than

20

dB

at

400

Hz,

1

kHz

More

than

10

dB

at

10

kHz

Adjust

the

separation

after

adjusting

the

meter.

Procedure

Mount

the

spring

coil

with

rope

on

the

drum,

and

thread

the

rope

in

the

direction

of

arrows

(in

the

numerical

sequence).

After

winding

four

turns

on

the

tuning

shaft,

return

to

the

spring

coil

of

the

drum.

STEREO

MODULATOR

__

ar

diel

fea

oO

ol

MPX

OUTPUT

FM

SIGNAL

|

GENERATOR

EXT

INPUT

©

O

eo

ee

FREQUENCY

COUNTER

SVRS02

Pointer

position

adjustment

Rotate

the

tuning

shaft

counterclockwise

until

it

turns

idle,

fit

the

pointer

to

the

left

end

point,

and

secure

it

firmly.

PARTS

LOCATION,

SVR901

eo

©

SVR801

PLAYBACK

LEVEL

ADJUST

R/P

LEVEL

ADJUST

SVR902

e

Shr

Se

ae

=

:

cacy

Nae

See

§

TP-3

TP-2

TP-1

ri

Tod,

il

ii

BAND

SWITH

cT-9

(Lw)

@

oO

(@)

T306(MW)

L116

(lw)

cT-8

(Mw)

©

TP-6

T307(MW)

fh]

[TY

EG

/~)

LA

3361

S

SVR

501

SVR

301

1304

(Mw)

T302

(FM)

TP-5

(R337)

Py

je

TP-1

avEu

CT-6

“6

(|

|

LO

(tw)

@

}

@D

\sw)

103

ne

-4(Sw)

cru)

|

D

cI-1

LN4&

LiN3

(Mw)

(Sw)

jr

6)

0][o}—)

SVR

502

ALC

BALANCE

ADJUST

SVR

703

e

SVR8B02

®

Linc

(Lw)

|

ee

|

i

Ht

1

ta

|

L104

CT-2(FM)

(FM)

3

|

@

CT-7

Ss)

aa)

(0

@)

L1i06(FM)

©

[s)

(FM)

TUNER

ADJUSTMENT

“

DC

voltage

is

15V

and

Speaker

Impedance

3

ohms.

Output

Power

50mW.

MW

ADJUSTMENT

:

1

nai

i

Connections

oe

7

cs

7

Step

Pubipiitg

a

aan

ee

ig

anak

Position

of

tuning

dial

Adjustment

~T

Connect

sweep

~

Connect

oscilto-

Low

end

of

dia!

scale

1

LET

generator

to

scope

to

EXT.

SP

pad

ae

ee

under

no

station

T304~T307

Test

Loop

terminals.

ts

ation

signal.

aoacee

tt:

Racha

505

KHz

(400

Hz

z

.

|

ose

Connect

AM

SG

Connect

VTVM

to|

30%

modulation)

POOL

ONS

Cia

seel:

mos

to

Test

Loop

speaker

terminals.

3

Load

High

end

of

dial

scale.

tld

at

Se

eet

.

600

KHz

(400

Hz

,

‘

ANT

Connect

AM

SG

Connect

VTVM

to|

30%

modulation)

BOO

e

Oe

Ce

Fee:

:

to

Test

Loop.

speaker

terminals.

5

E

eo

1400

KHz

on

dial

scale.

6

Repeat

adjustments.

=

a

PREPARE:

1.

3.

Selector

switch

to

“MW”.

LW

ADIUST

MENT

Set

the

dial

pointer

to

very

left

line

of

dial

scale.

2.

Connect

sweep

generator,

AM

SG,

VTVM

and

oscilloscope.

4.

5;

Use

a

screwdriver

with

plastic

grip

for

all

adjustments.

Use

a

dummy

of

back

lid

and

Rod

antenna,

adjust

tracking

points.

es

Te

=

Adjusting

|

ss

Connections

fe

Ss

a

‘

VTVM

Step

|

_Cireui

t

input

Guwat

SG

frequency

Position

of

tuning

dial

Adjustment

Oscilloscope

145

KHz

(400Hz

‘

~

4

7

Low

end

of

dial

scale.

L11

sumed

OSC

Connect

AMSG

|

Connect

VTVM

to

|

30%

modulation)

on

:

.

ie

rane

to

Test

Loop.

speaker

terminals.

|

295

KHz

(400

Hz

:

F

?

Way

nanan

=

eataes

30%

modulation)

High

end

of

dial

scale.

160

KHz

(400

Hz

:

3

160

KHz

ond

ale.

ANT

Connect

AM

SG

Connect

VTVM

to

|

30%

modulation)

0

He

crise

7

.

to

Test

Loop.

speaker

terminals.

|

280

KHz

(400Hz

_

5

30%

modulation)

_

280

KHz

on

dial

scale.

5

{!

Repeat

adjustments.

PREPARE:

1,

3.

Selector

switch

to

“LW”.

SW

a

ritidipsies

—

Set the

dial

pointer

to

very

left

line

of

dial

scale.

2.

Connect

sweep

generator,

AM

SG,

VTVM

and

oscilloscope.

30%

modulation)

SG

frequency

5.8

MHz

(400Hz

>

19

MHz

(400Hz~

30%

modulation)

_

.

Use

a

screwdriver

with

plastic

grip

for

ail

adjustments.

.

Set

the

Fine

Tuning

to

mechanical

center.

.

Use

a

dummy

of

back

lid

and

Rod

antenna,

adjust

tracking

points.

Position

of

tuning

dial

Adjustment

VTVM

Oscilloscope

Low

end

of

dial

scale.

High

end

of

dial

scale.

Step

Adjusting

Connections

a

CCU

Input

Output,

a

Rs,

14

|

Connect

AM

SG.

ose

to

ANT

terminal

Connect

VTVM

to

H

7,

through

EXT.

SP.

terminals.

2

|

dummy.

3

Connect

AM

SG.

ANT

to

ANT

terminal

Connect

VTVM

to

‘

through

EXT.

SP.

terminals.

4

dummy.

5

Repeat

adjustments.

“17.0

MHz

(400

Hz

18.0

MHz

(400

Hz

30%

modulation)

30%

modulation)

7.0

MHz

on

dial

scale.

18.0

MHz

on

dial

scale.

PREPARE:

4,

Set the

dial

pointer

to

very

left

line

dial

scale.

2.

Connect

signal

generator

to

dummy

antenna.

5.

Set

the

Fine

Tuning

to

mechanical

center.

3.

Use

screwdriver

with

plastic

grip

for

all

adjustments.

6.

Use

a

Dummy

antenna

as

follow.

FM

PAB

IUSTMENT.

4.

Selector

switch

to

“SW”

18°F

;

SO

ohm

c

t

Step

Adjustin

oe

}_

Soupectons.

SG

frequency

Position

of

tuning

dial

Adjustment

|

Circuit

“Input

‘Output

2

eens

De

mnee

aes

Connect

oscillo-

:

OTR

scope

to

TP4

(H)

T30i;

Tate

(pare

Connect

sweep

&

shield

plate

(E).

|

10.7

MHz

Near

max.

capacitance

.

soot

generator

to

FM

|

p=

(0%

modutation)

tuning

gang

under

TP1

(H)

&

TP2

(E}|

Connect

oscillo-

no

station

signal.

2

|

Ratio

Det.

scope

to

TP5

(H}

T303

|

&

shield

plate

(E).

se

ere

Pes

inact

ean

ats

Ba

Eases

ea

ee

-

=

eae

i

87.25

MHz(400

Hz

r

3

hes

Connect

£56

Connect

VTVM

to

[30%

modulation)

Low

end

of

dial

scale.

L106

to

TP-

:

vena

tae

oe

ker

terminal.

TP-2

(E)

Spee

109.0

MHz

(400

Hz

:

4

-

:

30%

modulation}

=

High

end

of

diat

scale.

cT3

90.0

MHz

(400

Hz

:

is}

2

90.0

MHz

on

dial

scale.

L103,

L104

ANT

ey

Cae

Connect

VTVM

to

|

30%

modulation)

5

;

TP-2

(E)

speaker

terminal.

|

106.0

MHz

(400

Hz

,

(

:

etn

30%

modulation)

ee

MHz

on

dial

scale.

eh

CT2

;

at

|

Repeat

adjustments.

PREPARE:

1.

Set

the

dial

pointer

to

very

left

line

of

dial

scale.

2.

Connect

sweep

genrator,

FM

SG,

VTVM

and

oscilloscope.

FM

antenna

input

impedance

is

300

ohm.

3.

Use

a

screwdriver

with

plastic

grip

for

all

adjustments.

4.

AFC

switch

OFF.

—3—

BLOCK

DIAGRAM

RECORD

BLOCK

DIAGRM

(eee

any)

PHONO

AMP

\Q910,Q914

TONE

ADJUST

PRE

AMP

~q

MAIN

AMP

TREBLE

BASS

es

ALC

SWITCH

O

(ears

gee

an

PHONO!

1¢902

HEADPHONES

(Q804,Q904)

VOLUME

LEVEL

ADJUST

OFF

=a

—O

DOLBY

AMP

(2812.a813)

SPEAKER

Q912,Q913

A

TONER

RECORD

AMP

(Q808,Q908)

LINE

IN

OSCILLATION

CIRCUIT

(a809,Q909)

METER

EDIT

SWITCH

PLAYBACK

BLOCK

DIAGRAM

(avian

)

PHONO

AMP

\Q910,Q911

LINEOUT

V

(jean

aes)

=

MIC

AMP

Q901,0902

MIC

|

INPUT LEVEL

ADJUST

Q812.0813

1C801

ig

(as17-co13)

(reser

(0804,a904)

|

TONE

AdUUST

TAPE

EQUALIZER

AMP

DOLBY

AMP

PRE

AMP

TREBLE

BASS

MAIN

AMP

(ié903

)

Sse

or

WIRELESS

AMP

+8

TUNER

AMSS

AMP

METER

AMP

—

Se,

tare

crinoe

)

(Q809

,Q909)}

(/)

METER

LINE

IN

Q712.Q713,1C703

Sanyo M9998LU Manual de usuario

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