Sansui 2000X User manual

Table of contents

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SERVICE

MANUAL

SOLID-STATE

AM/FM

STEREO

TUNER

AMPLIFIER

SANSUI

ELECTRIC

COMPANY

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CONTENTS

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CIRCUIT

BOARDS

AND

PARTS

LIST

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15,

16,

17, 18,

19, 20,

21,

22,

23,

24,

25,

26, 27,

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GENERAL

TROUBLESHOOTING

CHART

re

Te

SS

SS

If

the

amplifier

is

otherwise

operating

satisfactorily,

the

more

common

causes

of

trouble

may

generally

be

at-

tributed

to

the

following:

1.

Incorrect

connections

or

loose

terminal

contacts.

Check

the

speakers,

record

player,

tape

recorder,

antenna

and

line

cord.

2.

Improper

operation.

Before

operating

any

audio

com-

C

ponent,

be

sure

to

read

the

manufacturer’s

instructions.

3.

Improper

location

of

audio

components.

The

proper

positioning

of

components,

such

as

speakers

and

turn-

table,

is

vital

to

stereo.

4.

Defective

audio

components.

The

following

are

some

other

common

causes

of

mal-

function

and

what

to

do

about

them:

7

PROGRAM

SYMPTOM

PROBABLE

CAUSE

WHAT

TO

DO

AM,FM

or

MPX|

A.

Constant

or

intermit-

|

*

Discharge

or

oscillation

*

Attach

a

noise

limiter

to

the

electri-

reception

tent

noise

heard

at

caused

by

electrical

appli-

cal

appliance

causing

the

noise,

or

times

or

in

a

certain

ances,

such.

as

fluorescent

attach

it

to

the

amplifier’s

power

area

lamp,

TV

set,

D.C.

motor,

source

.

rectifier

or

oscillator

*

Install

an

outdoor

antenna

and

C

)

*

Natural

phenomena,

such

as

ground

the

amplifier

to

raise

the

we

atmospherics,

statics

or

signal-to-noise

ratio.

a

a

thunderbolts

*

Reverse

the

power

cord

plug-

*

Insufficient

antenna

input

receptacle

connections

due

to

ferroconcrete

wall!

x

If

.

:

:

the

noise

occurs

at

a

certain

or

done

distance

from

the

frequency,

attach

a

wave

trap

to

the

ANT.

input

i

F

Me)

ee

*

Keep

the

set

at

a

proper

distance

pp

from

other

electrical

appliances

B.

The

needle

of

the}

*

Receiver

is

located

in

a|

*

Place

the

set

to

receive

maximum

\

tuning

meter

does

not

weak

signal

area

signal

strength

move

sharply

C.

The

zero

point

of

the

|

*

Regional

difference

in

field

|

*

The

unit

is

not

at

fault

meter

diverges

much

intensity.

AM

reception

A.

Noise

heard

at

a|

*

Due

to

the

nature

of

AM]

*

Install

the

antenna

for

maximum

particular

time

of

a

broadcasts

antenna

efficiency.

See

‘“ANTEN-

day,

in

a

certain

area

NA”’

in

the

operating

instructions

or

over

part

of

dial

*

In

some

cases,

the

noise

can

be

eliminated

by

grounding

the

ampli-

fg

fier

or

reversing

.the

power

cord

ML

plug-receptacle

connections

B.

High-frequency

noise

*

Adjacent-channel

interfer-

|

*

Although

such

noise

cannot

be

ence

or

beat

interference

eliminated

by

the

amplifier,

it

is

ie

Ty

-eatctad.

Cloke:

to.

audio

advisable

to

adjust

the

TREBLE

postenn

control

from

midpoint

to

left

and

y

switch

on

the

HIGH

FILTER

*

Keep

the

TV

set

at

a

proper

distance

4

from

the

audio

system

FM

reception

A.

Noisy

*

Poor

noise

limiter

effect

or

|

*

Install

the

antenna

(supplied)

for

too

low

SN

ratio

due

to

maximum

signal

strength

&

insuficrenbantentaaput

*

If

this

does

not

prove

effective,

use

an

outdoor

antenna

designed

Note:

FM

reception

is

affected

considerably

by

exclusively

for

FM.

When

you

use

transmission

conditions

of

stations:

power

and

a

TV

antenna

for

both

TV

and

FM

antenna

efficiency.

Asa

result,

you

may

receive

with

a

splitter,

make

sure

TV

recep-

one

station

quite

well

while

receiving

another

tion

is

not

affected

station

poorly

*

An

excessively

long

antenna

may

f

cause

noise

(

:

oe

a

SS

eee

|

PROGRAM

FM

reception

SYMPTOM

B.

A

series

of

pops

is

PROBABLE

CAUSE

Ignition

noise

caused

by

WHAT

TO

DO

*

Install

the

antenna

and

its

lead-in

(cont’d)

heard

an

automobile

engine

wire

in

proper

distance

from

the

road

or

raise

the

antenna

input

as

described

above

C.

Tuning

noise

between

|

*

This

results

from

thenature.|

*

Turn

the

muting

on.

stations

of

the

FM

reception.

As

the

station

signal

becomes

weak,

the

noise

limiter

effect

is

decreased,

and

the

amplifi-

cation

of

the

limiter,

in

turn,

is

enlarged,

generating

a

noise

FM-MPX

A.

Noise

heard

during

|

*

Weaker

signal

because

the

|

*

Install

the

antenna

for

maximum

reception

FM-MPX

_

reception

service

area

of

the

FM-

antenna

input

while

not

heard

during

FM

mono

reception

MPX

broadcast

is

only

half

that

of

the

FM

mono

broad-

cast

B.

Clearness

of

channel

separation

isdecreased

during

reception

Excess

heat

C.

The

stereo

indicator

blinks

on

and

off

D.

The

stereo

indicator

blinks

on

and

off

even

though

stereo

station

is

not

received

Interference

Interference

*

Switch

on

the

HIGH

FILTER

and/or

turn

the

TREBLE

control

from

mid-

point,

left

*

Circulation

of

air

is

important

to

the

amplifier.

Be

sure

that

air

is

flowing

under

the

amplifier

*

The

indicator

is

not

at

fault.

Adjust

VRaor

*

The

indicator

is

not

at

fault.

Adjust

VRao1

,

Record

playing

or

tape

playback

A.

Hum

or

howling

Record

player

placed

direct-

ly

on

speaker

Wire

other

than

shielded

wire

used

Loose

terminal

contact

Shielded

wire

too

close

to

line

cord,

fluorescent

lamp

or

other

electrical

appli-

ances

Nearby

amateur

radio

sta-

tion

or

TV

_

transmission

antenna

*

Place

a

cushion

between

the

player

and

the

speaker

box

or

place

them

away

from

each

other

*

The

connecting

shielded

wire

should

be

as

short

as

possible

*

Switch

on

the

LOW

FILTER

and

turn

the

BASS

control

from

midpoint

to

left

*

Consult

the

nearest

Radio

Regulatory

Bureau

B.

Surface

noise

*

*#

&

&

*

Worn

or

old

record

Worn

stylus

Stylus

dusty

Improper

stylus

pressure

Worn

playback

head

*

Switch

on

the

HIGH

FILTER

and

turn

the

TREBLE

control

from

mid-

point

to

left

*

Clean

or

replace

the

stylus

*

Replace

the

playback

head.

All

stereo

programs

BALANCE

control

is

not

at

midpoint

when

equal

sound

comes

from

left

and

right

channels

It

is

important

to

adjust

for

equal

sound

from

both

channels.

It

should

not

always

be

set

to

the

mid-

point

*

Set

the

MONO

switch

to

MONO

and

then

set

the

BALANCE

control

to

a

position

where

equal

sound

comes

from

both

channels

CUSTOM

MOUNTING

aa

How

to

install

the

amplifier

in

a

wooden

cabinet

1.

Make

a

cabinet

cutout

of

432mm

or

17”

in

width

and

117mm

or

4°°/64”

in

height.

:

2.

Place

two

square

pieces

of

wood

(20

X

20x

240mm

or

25150”

X

8/50”

X

92°/,,”)

for

supporting

the

amplifier

in

the

bottom

board

of

the

cabinet.

3.

Cut

two

holes

for

attachment

bolts

in

the

bottom

board

of

the

cabinet.

4,

Remove

the

amplifier

from

the

wood

case

(Refer

to

the

section

entitled

“DISASSEMBLY

PROCEDURE”).

5.

Place

the

amplifier

in

position

through

the

cabinet

cutout.

6.

Make

sure

the

amplifier

is

in

position,

then

put

the

washers

in

butterfly

bolts

(4X

40mm)

and

fix

the

amplifier

to

the

cabinet

with

the

butterfly

bolts,

Note:

When

the

amplifier

is

built

into

the

custom

cabinet,

the

wood

case

:

assembly

including

screws

and

washers

is

not

used.

Retain

it

for

future

uses

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front

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