Hitachi Ia-1200 User manual

HITACHI

HI-Fl

COMPONENT

I[A-1200

INTEGRATED

AMPLIFIER

INSTRUCTION

MANUAL

Hitachi,

Ltd.

Tokyo

Japan

Thank

you

very

much

for

purchasing

HITACHI

integrated

amplifier

IA-1200.

TA-1200

is

a

versatile,

high

performance

amplifier

designed

for

use

by

music

lovers.

It

has

four

built-in

main

amplifiers,

which

makes

it

possible

to

use

this

equipment

in

three

ways;

as

full

range,

multi-channel,

and

center

woofer

systems.

For

the

heart

of

this

equipment

HITACHI

silicon

transistors

of

high

reliability

are

used,

which

will

please

you

with

low

distortion

sound

over

a

wide

dynamic

range.

A

variety

of

built-in

accessory

Circuits

are

designed

to

suit

every

kind

of

program

source

in

the

best

condition.

Before

using

IA-1200,

please

read

this

instruction

manual

so

that

you

can

bring

the

performance

of

this

equipment

into

full

play.

CONTENTS

Handling

of

front

KnNObDS

.........cccccssscsssessccesecccecstearscssenses

3-4

Connection

of

rear

terminals

.........:sccsssscsssesesesessecsesceeeeses

5-6

Connection

of

speakers

.......:ssscsscccssscessscsecersessessaseesesenss

7-9

Cautions

during

use

...........sc0e

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apiQuacthnts

DeaeudSesvaadeoucaadveens

10

Example

of

construction

of

stereo

system

...s.:ssseseree

11-12

Specifications

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

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13-14

CARACTONISHIG:

-

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wis

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15-16

Cireuit

Gidgranni:

teescidecdonsasatcasemnccctuvecde

evideesce

GEE

eaesbdacacocces

18

HITACHI,

Ltd.

has

been

devoting

its

effort

to

the

development

of

a

series

of

audio

equipment

and

high

class

Hi-Fi

components

of

high

performance

and low

distortion.

HITACHI

has

put

this

1A-1200

on

the

market

with

confidence.

@

Before

using

.........

Be

sure

to

turn

off

the

power

switch

when

you

remove

the

cover

in

order

to

insert

the

filter

unit

or

to

operate

the

channel

select.

Be

sure

that

the

ventilation

holes

on

the

amplifier

cover

are

not

blocked,

and

do

not

place

this

equipment

in

direct

sunlight,

because

transistors

are

susceptible

to

heat

and

excessive

heat

causes

troubles.

Pay

attention

for

efficient

radiation

of

heat

during

use.

@

Handling

of

Front

Knobs

@

Mode

switch

(MODE)

A

five

-position

switch

for

different

uses.

REVERSE

sound

emitted

from

the

left

and

right

speakers

is

reversed.

STEREO

reproduction

in

normal

stereo.

LEFT

signals

from

the

left

input

terminal

are

teproduced

by

both

left

and

right

speakers.

RIGHT

signals

from

the

right

input

terminal

are

reproduced

by

both

left

and

right

speakers,

L+R

left

and

right

signals

are

reproduced

by

left

and

right

speakers

after

being

mixed.

Reproduction

of

a

monaural

record

at

this

position

is

accomplished

with

less

noise.

@

Power

switch

(POWER)

When

this

switch

is

pushed

toward

ON,

the

pilot

lamp

above

it

comes

on

and

power

is

supplied.

@

Microphone

jack

(MIC)

Sensitivity

of

1.5

mV

and

flat

charac-

~

teristic.

Usable

for

a

microphone

having

an

impedance

less

than

10

kQ.

Regardless

of

the

position

of

the

mode

switch,

the

mode

becomes

L

+

R

state

when

a

microphone

is

plugged

into

this

jack

so

that

signals

from

one

microphone

-are

reproduced

by

both

left

and

right

speakers.

This

jack

will

facilitate

com-

mentary

at

a

record

concert

and

public-

address

use.

@

Function

switch

(FUNCTION)

For

selection

of

program

sources

which

you

prefer.

@

Power

limit

(POWER

LIMIT)

Position

this

lever

according

to

the

allowable

speaker

input.

Usually,

the

allowable

instantaneous

speaker

input

is

more

than

three

times

the

allowable

continuous

input.

The

indication

is

the

total

value

of

all

channels.

@

Monitor

(MONITOR)

When

reproducing

sound

using

a

tape

deck,

push

this

lever

toward

TAPE

position.

While

recording

sound

on

a

three-head

tape

recorder,

you

can

sim-

ultaneously

monitor

the

recording

con-

dition

by

positioning

this

lever

at

TAPE.

@

Bass

contro!

(BASS)

Bass

adjustment

in

a

range

of

+12

dB

at

100

Hz

can

be

made

for

left

and

right

speakers

separately.

‘

i

@

Low

filter

(LOW

FILTER)

When

this

switch

is

ON,

rumble

of

a

turntable,

low

frequency

noise

in

a

record,

and

low

frequency

noise

due

to

a

microphone

are

attenuated

by

8

dB

at

30

Hz.

This

switch

functions

regard-

less

of

the

setting

of

the

defeat

switch.

@

Treble

control

(TREBLE)

Treble

adjustment

in

a

range

of

+12

dB

at

10

kHz

can

be

made

for

left

and

tight

speakers

separately.

@

Tone

defeat

(DEFEAT)

When

this

lever

is

pushed

down

adjust-

ment

of

treble

and

bass

becomes

possi-

ble,

and

when

pushed

up

a

flat

char-

acteristic

is

obtained

regardless

of

the

position

of

the

control

knobs.

e@

Speaker

select

(SPEAKER

SELECT)

This

is

an

ON-OFF

switch

for

two

sets

of

the

four

built-in

main

ampli-

fiers.

For

operation

of

this

switch,

refer

to

the

section

on

connection

of

speakers.

@

Balance

(BALANCE)

This

is

for

adjusting

the

left

and

right

output

levels.

Adjust

so

that

the

volume

of

sound

from

the

left

and

right

speakers

balances

at

the

listening

posi-

tions.

e@

Volume

(VOLUME)

This

is

for

adjusting

the

volume

of

sound.

e

High

filter

(HIGH

FILTER)

When

this

switch

is

ON,

scratches

from

a

used

record

and

high

frequency

noise

of

AM

broadcasting

can

be

at-

tenuated

by

8

dB

at

10

kHz.

This

switch

functions

regardless

of

the

set-

ting

of

the

defeat

switch.

:

@

Speaker

switch

(SPEAKER)

While

in

use

this

switch

is

positioned

at

ON.

When

positioned

at

MUTE

the

output

is

decreased

to

1/10

(10

dB).

It

is

possible

to

decrease

sound

without

decreasing

the

volume

when

a

record

is

exchanged

or

when

it

is

desired

that

the

volume

of

sound

be

decreased

temporarily.

When

positioned

at

OFF

no

sound

is

reproduced

from

the

speakers.

When

a

headphone

is

used,

position

this

switch

at

OFF.

e@

Headphone

jack

(PHONES)

To

this

jack

a

headphone

with

an

impedance

of

8©

can

be

connected.

Because

of

a

built-in

amplifier

for

exclusive

use

with

the

headphone

this

jack

can

be

used

regardless

of

the

main

amplifier.

@

Connection

of

Rear

Terminals

ee

Connecting

jack

for

pre-

amplifier

and

main

amplifier

By

the

use

of

this

jack

the

pre-

amplifier

and

main

amplifier

can

be

used

separately.

This

jack

will

facilitate

increasing

the

number

of

channels

of

a

multi-channel

amplifier.

Changeover

is

accom-

plished

by

CONNECTOR

switch.

@

Speaker

terminal

(SPEAKERS)

Different

connecting

methods

are

employed

depending

on

uses.

Re-

fer

to

the

section

on

connection

of

speakers.

@

Power

source

socket

(AC

OUT-

LET)

This

supplies

power

to

a

tape

recorder,

record

player,

tuner,

etc.

The

socket

marked

SWITCHED

socket

is

independent

of

the

power

switch.

@

Fuse

holder

2A

fuse

is

contained.

®

Power

cord

fe

ee

@

Input

and

output

jacks

for

tape

deck

Connect

a

tape

deck

having

a

head

output

jack

to

TAPE

HD

jack

(equalizer

is

NAB

of

19

cm/s).

Connect

a

tape

deck

having

a

built-in

preamplifier

to

TAPEMON-

ITOR

jack

for

playback

and

to

REC.OUT

jack

for

recording.

Con-

@

Main

A

channel

level

(MAIN

A

CH

LEVEL)

When

using

this

equipment

as

a

multi-channel

or

center

woofer

amplifier,

adjust

this

knob

so

that

the

volume

of

treble

is

balanced

with

bass.

Left

and

right

channels

can

be

adjusted

independently.

nect

a

tape

deck

having

a

DIN

jack

to

REC/PB

socket,

and

re-

cording

and

playback

can

be

ac-

complished

with

a

single

cord.

In

this

case

do

not

use

MON-

ITOR

jack

or

REC.OUT

jack.

LEVEL

ADMUST

TUNER

Fare

np

oxte)

AUK,

o

Ground

Terminal

(EARTH)

@

Level

adjust

(LEVEL

ADJUST)

This

matches

the

volume

of

AUX

and

TUNER

with

that

of

record

playback.

While

recorded

sound

is

being

reproduced

turn

the

func-

tion

switch

to

AUX

and

TUNER

positions

without

turning

the

volume

knob

and

adjust

the

volume

of

sound.

me.

@

Tuner

and

auxiliary

input

terminals

Input

sensitivity

is

higher

than

50

mV

for

both

tuner

and

auxil-

iary

input.

Input

impedance

is

higher

than

100

kQ.

Frequency

characteristic

is

flat.

Adjust

the

input

level

by

the

level

adjust

knobs

on

this

rear

panel.

Gc

@

PHONO

1.

Input

sensitivity

is

1.5

mV.

Con-

nect

a

record

player

having

a

cartridge

with

an

output

of

1

-

3

mV

(cut

level

of

5

cm/s.)

@

PHONO

2.

Input

sensitivity

is

5

mV.

Con-

nect

a

record

player

having

a

cartridge

with

an

output

of

3

-

10

mV

(cut

level

of

5

cm/s.)

Inptt

impedance

is

50

kOfor

both

PHONO

|

and

2,

and

the

equalizer

is

of

RIAA

standard.

|

@

Microphone

jacks

Sensitivity

is

1.5

mV.

and

the

characteristic

is

flat.

A

micro-

phone

with

less

than

10

kQ

impedance

can

be

used.

While

the

microphone

jack

on

the

front

panel

is

in

use

this

microphone

jack

cannot

be

used.

'

}

i

}

@

Connection

of

speakers

Several

ways

of

speaker

connection

are

possible

with

IA-1200

by

turning

the

channel

select

switch.

Be

sure

to

connect

speakers

to

the

correct

terminals.

(Channel

select

switch

will

be

found

in

the

amplifier

when

the

cover

is

removed.

Before

handling

this

switch

be

sure

to

turn

off the

power

switch.)

A

Socket

for

filter

unit

B

Channel

select

switch

@

Full

range

connection

Block

diagram

for

full

range

connection

Connecting

jack

for

4

preamplifier

and

Preamplifier

main

amplifier

cle

Connecting

jack

for

preamplifier

and

main

amplifier

Phase

inversion

circuit

@

When

one

pair

of

speakers

are

used

In

case

two

30

W

speakers

are

used.

(30W

x

2)

Connect

to

A

channel

or

B

channel

and

position

the

speaker

select

switch

at

A

or

B.

Even

if

the

unused

channel

is

left

open,

electric

shock

or

trouble

will

not

be

caused.

(Fig.

1)

(30W

X

2)

Fig.

1

In

case

two

60

W

speakers

are

used.

(60W

x

2)

Connect

to

the

respective

plus

terminals

of

A

channel

and

B

channel.

When

speakers

with

a

low

allowable

input

are

connected,

the

maximum

output

can

be

limited

by

the

power

limit

on

the

front

panel.

Position

the

speaker

select

switch

at

A

+

B.

(Fig.

2)

(60W

X

2)

Fig.

2

@

When

two

pairs

of

speakers

are

used.

In

case

four

30

W

speakers

are

used.

(30

W

x

4)

Channels

are

switched

by

the

speaker

select

switch

on

the

front

panel

to

A

channel

alone

or

B

channel

alone

or

A

+

B

channels.

Only

when

two

pairs

of

speakers

are

used

connect

the

speakers

of

B

channel

\

reverse

polarity.

(Since

the

phase

inversion

circuit

is

inserted

in

B

channel,

it is

necessary

to

reverse

the

polarity

of

B

channel

to

conform

the

phase

of

B

channel

to

that

of

A

channel

when

both

A

and

B

channels

are

used

in

the

same

room.)

(Fig.3)

{30W

x

4)

Fig.

3

@

In

case

of

2-way

multi-channel.

Set

the

channel

select

switch

in

the

equipment

at

the

position

of

multi-channel.

Then

insert

two

commercially

available

filter

units

(one

each

for

left

and

right

channels)

in

the

filter

unit

sockets.

(Be

sure

to

turn

off the

power

switch,

otherwise

the

units

might

be

damaged

by

shock

due

to

insertion.)

@

Block

diagram

for

multi-channel

=e

jack

for

preamplifier

Dividing

circuit

Main

amplifier

and

main

amplifier

BR

Preamplifier

|

BL

CS.

Dividing

Main

amplifier

Connecting

jack

circuit

for

preamplifier

and

main

amplifier

Connect

speakers

to

the

amplifier

in

such

a

way

that

the

plus

poles

of

speakers

are

connected

to

the

plus

terminals

of

the

amplifier,

and

minus

poles

to

minus

terminals.

A

channel

is

for

treble

range

and

B

channel

for

bass

range.

Adjust

the

level

of

the

tweeter

by

MAIN

A

CH

LEVEL

knob.

Turn

it

fully

counterclockwise

at

first,

then

turn

it

clockwise

little

by

little

while

listening

to

bass

from

the

woofer.

.

Tweeter

Woofer

@

In

case

of

center

woofer

Set

the

channel

select

switch

in

the

equipment

at

the

position

of

C.

WOOFER.

A

filter

unit

for

center

woofer

is

inserted

in

the

filter

unit

socket.

The

crossover

frequency

is

150

Hz

and

its

characteristic

is

shown

below.

CR

2-step

frequency

characteristic

of

dividing

circuit

Response

(dB)

30

50

70100

200

306

500700

1K

Frequency

(Hz)

2K 3K

5K

7K10K

20K

o

Block

diagram

for

center

woofer

system

Dividing

circuit

Main

amplifier

©-

Connecting

jack

for

preamplifier

and

main

amplifier

Preamplifier

Phase

inversion

circuit

7

_|

Dividing

:

=

Eatcesiins

jack

|

circuit

Main

amplifier

for

preamplifier

and

main

amplifier

As

a

speaker

system

for

intermediate

and

high

frequencies,

use

speakers

of

small

size,

full

range

type.

Adjust

the

level

of

speakers

for

intermediate

and

high

frequencies

by

A

CH

LEVEL

knob

as

in

the

case

of

multi-channel

system.

Connect

a

woofer

as

shown

below.

Center

speaker

for

low

frequencies

Speaker

for

intermediate

and

high

frequencies

and

high

frequencies

Speaker

for

intermediate

@

Caustions

during

Use

e@

Make

complete

connection

‘Use

perfect

lead

wires

for

connection

of

input

terminals.

Incomplete

connection

causes

noise

and

prevents

obtaining

the

maximum

performance.

‘Since

the

method

of

connecting

speaker

terminals

is

different

from

that

of

other

equipment,

make

certain

that

connection

has

been

made

correctly

before

turning

on

the

power

switch.

The

polarity

of

speakers

can

be

confirmed

by

check-

ing

the

phase

with

the

mode

switch

turned

to

R

+

L

position

(monuaral)

of

when

a

monaural

record

is

played.

Usually,

if

wrong

polarity

connected

it

will

seem

as

if

bass

were

decreased.

e

Protective

circuit

When

power

is

cut

off

by

the

operation

of

the

power

limit

and

power

transistor

protective

circilit

(when

speaker

terminals

are

shorted

or

a

speaker

with

very

low

impedance

is

actuated

by

excessive

output),

turn

off

the

power

switch

and

remove

the

cause,

Constant

Supply

and

protective

circuits

and

then

turn

on

the

switch.

Because

of

the

built-in

automatic

release

circuit,

releasing

is

accomplished

automatically

even

if

the

power

switch

is

not

turned

off,

but

the

protective

circuit

temporarily

stops

the

operation

of

the

amplifier.

While

the

protective

circuit

is

operating

the

pre-

amplifier

is

working.

e

Grounding

Connect

a

vinyl-coated

wire

or

enamel

wire

to

the

ground

terminal,

and

to

the

other

end

of

this

wire

connect

a

copper

plate

to

be

buried

in

the

ground.

A

-

ground

wire

for

a

player

used

together

with

this

equip-

ment

may

be

connected

to

ground

terminal;

hum

and

noise

are

thus

decreased.

—10—

@

Example

of

Construction

of

Stereo

System

Speaker

system

—

=H)

Recording

and

playback

cord

ff

Pecorsing

and

playback

cord

1

TO

LINE

OUT

i

Tape

deck

with

a

recording

and

Tape

deck

with

a

recording

Cassette

tape

deck

-

on

playback

connector

playback

preamplifier

vies

EY

ee

FM

tuner

.

Record

player

)

INPUT

f

TO

LINE

OUT

Tape

deck

without

|

preamplifier

-

Ground

Ui,

Y

Y//

Tape

deck

with

only

playback

preamplifier

ee

ise

@

Specifications

Type

All

silicon

transistor

stereo

integrated

amplifier

Circuit

system

Semi-complementary

SEPP

OTL

57

transistors

2SC-650

x

22,

2SC281

x

6,

28C317

x2,

Transistors

used

2SC-708A

x

12,

2SA-537A

x

4,

2SC-655

x

8,22SC-685A

x

2,

2SA-565

x

1

Diodes

used

_17

diodes

a

*

IN34A

x

4,

VOIGx4,

HV-23

x

8,

ZR-212Ex

1

@

Main

amplifier

Continuous

output

120

W

(8Q)

30W

x4,

60W

x

2,

30

W-

60

W-

30

W

(changeover)

Music

power

(IHF)

200

W

Less

than

0.1%

at

the

rated

output

Distortion

(T.H.D.)

Less

than

0.1%

at

0.5

W

output

Frequency

characteristic

20

Hz

-

50

kHz

less

than

He

dB

S/N

More

than

100

dB

Damping

factor

40

(8Q)

Input

sensitivity

1

V

(input

needed

for

the

rated

output)

Input

impedance

50kQ

@

Preamplifier

Output

3V

Output

impedance

10k

Distortion

Less

than

0.1%

*

_13—

Specifications

are

subject

to

change

for

improvement

without

notice.

PHONO

1

1.5mV

(50kQ)

PHONO2

S5mV_

(50kqQ)

TAPE

HEAD

1.5mV

(higher

than

100

kO,

1kHz)

Input

level

(higher

than

300

kQ.

10

kHz)

(Input

impedance)

MIC

1.5mV

(10

ka)

TUNER,

AUX

150mV

(100k)

(adjustment

in

a

range

of

50

-

500mV

is

possible

using

level

set)

TAPE

MONITOR

300mV

+

2

dB

Higher

than

1

V

(at

standard

input

level)

Higher

than

3

V

(maximum)

(less

than

10

kQ)

REC

OUT

(at

standard

input

level)

200

mV

+

2

dB

(less

than

10

ka)

DIN

OUT

(at

standard

input

level)

50

mV

+

2

dB

(less

than

10

kQ)

Output

level

(Output

impedance)

Tone

control

BASS

100Hz+

12

dB(1

kHz

OdB)

(with

defeat

switch)

TREBLE

10

kHz

+12

dB(1

kHz

0dB)

a

ge

HIGH

10

kHz-8

dB

Filter

LOW

30

Hz~8

dB

3D

150

Hz

(12

dB/Oct)

PHONO

1,

PHONO2

904B

S/N

(IHF)

TAPEHEAD,

MIC

_—-80dB

AUX,

TUNER

100

dB

eee

Power

source

eine

220¥,.

50/

60Hz

;

Power

consumption

60

VA

at

no

signal

400

VA

at

rated

output

LS

Dimensions

.

,

:

420

(W)

x

140

(H)

x

320

(D)

mm

Weight

(164-)

65)

(12

+)

nn

ss

12

kg

(26

Ibs)

a

—14—

@

Characteristic

Output

band

width

Input

(AUX)

150mV

OdB=30W

(Load

82)

.

i

60w

Input(AUX

)150mV

Cll

haere

TT

ns

Sn

a

20

100

200

500

1K

2

5K

10K

20K

50K

Frequency

(Hz)

Output

band

width

Output

(dB)

Characteristic

of

distorti

|

(multi-channel)

i

=~

|

z

Characteristic

of

distortion

5

vs.

output

8

(multi-channel)

Re

npu

AO

Ah

Tem

2

Load

8

Q

|

£

fa)

i

R

i

5

HI

nput

AUX)

1

Characteristi

i

8

|

acute

¢

of

distortion

©

input

(AUX)

150mV

.

(full

ra

)

re

OdB=

30w

(Load

82)

|

Inge

8

Higher

harmonic

distortion

a

factor

5%

2

Gia

wi

—~15—

‘one

control

characteristic

Response

(dB)

:

Frequency

(Hz)

Combined

frequency

characteristic

\

of

preamplifier

and

main

amplifier

Input

(AUX)

150mV

(full

range)

OdB=

2V

(82Load

500mW)

TONE

DEFEAT

Hat

iil

10

20

50

100

200

500

IK

2K

5K

10K

20K

SOK’

Frequency

(Hz)

y

Combined

frequency

characteristic

of

preamplifier

and

main

ampliitier

(full

range)

T=

Input

(AUX)

150mV

OdB=

2V

Load

8.Q

TONE

DEFEAT

Response

(dB)

0.5

Characteristic

of

distortion

vs.

frequency

(full.

range)

As.

5

:

3

x

Sone

Characteristic

of

distortion

:

Faget

oF

vs.

frequency

Output

20wW

|]

(full

range)

et

Distortion

(%)

°

i

3

5

7100

MM

MD

MM

1K

RK

BK

SK 7K

10K

20K

Frequency

(Hz)

S4gi

IA-

1200

CIRCUIT

DIAGRAM

‘i

AUX

TUNER

PHONO

~!

PHONO-2

TAPE

HDi

MIC

MONITOR

PB/REC

REC

OUT

MONITOR

G)

Mic

@

Ro

a2

TAPE

HD@

PHONO-

20)

€

R4

S6K

R2

S6K

TUNER

©

[Fm

250K-8

@

250K-8

PHONO-1

73

AUX

Sla.Stb.Sic.

Sid.Ste.

Sif

$2a.S2b

$3a.S3b.S3c

$4a,S4b,S4c

.S4d

$5a.S5b.S5c,S5d

$60.S6b

S7a,S7b

$8q,S8b,S8c.S8d

S90,S9b,S9c.S9d

$10qa.

SIOb

sul

af

v2

3.54

v5

S2a

oz

°

Qe

TRIO

2sce50®

coz

clot

\

TRIO6

2sc6s0©@

FUNCTION

MONITOR

MODE

TONE

-

DEFEAT

LOW

FILTER

HIGHT

FILTER

PRE

MAIN

CONNECT

SPEAKER

SELECT

POWER

LIMIT

POWER

EX

MIC

DIN

CONNECTOR

FILTER

SOCKET

HEAD

PHONE

TRIOS

TRI0g

2SC6500

28C650@

TRIOS

RIS2

330!

cis

aovesus470P

||

a

s|

af

3,

a.

6 6 6 $ 6

Co

sit

(1.AUX,

2.TUNER,3.PHONO-1,4,PHONO-2,

5.

TAPE

HEAD,

6.MIC)

(SOURCE

,

2,

TAPE)

(\,

REVERSE

,

2.STEREO

,3.L,4.R,

5.L+R)

(1.OFF

2,.0N)

(1,0FF

2.0N)

(1.OFF

2,0N)

(1.OFF

2.0N)

CLMUTE

2.0N

3,0FF)

(1.4,2,A+B,

3.8)

(1.

120W,

2.

8OW,3.

40W)

(1LOFF,2,.0N)

TR208

2sc650®@

VRia

,

VRIb

VR2q,VR2b

VR3a,VR3b

VR4

VRS

VR6,VR7

VR84q,

VR8b

VR9

,

VRIO

Specification

1,

Resistors

are

all

carbon

film

fixed

resistors

(RD%P)

unless

otherwise

specified

in

the

diagram.

VR8a

SOK-

HB

O2

onl

3

Ge

S50

PREAMP)

UNIT

|

are

TR202

5

6

2sces0-@

S21

TReOS,

j2SC650H)

TR2O01

'6v'7-

Jrati

Rate

his

aio

lesceso

C203

474

1SOK

150K

cae

Besar

c201

®

tH+

|

Icave

|c207

1p25v

‘

O15

p

|O.15_

3

4»

Reor.

vA3d!

|

82k

czos

sox

ee

A

R202

ae

-|-;

Ss

C208

9-4

330

10.22,

20

f/

pes

|r

4.Tpl6

Re

"R20

me

|

47K

BI6Y

i

270K

Rei

sy

c:

5

C210

2

R217)

!|SOK:

tf

reo

|

2

NE

ioe]

$

15K

ov

UT

Ti

R21

R204

R208

220K

15K

aR

PRE

OUT

MAIN

IN

TR

+]47K

“Tc2e3

O.22pn

or

Ree

10K

AUX

LEVEL

TUNER

LEVEL

VOLUME

CONTROL

TONE

CONTROL

(TREBLE)

TONE

CONTROL

(BASS)

BALANCE

Ach

LEVEL

ee

2sv

‘tee

toot

R24i

|

Rea2

[TH

he

ISOK

1]

|

czze

DL

ONS

S5OK-HB

210

.

Qo

2.

The

units

for

resistor

and

capacitor

are

(Q.)

and

(F),

respectively.

3.

The

constants

for

R39, R40,

and

R41

are

decided

after

adjustment.

R262

470

IW

+)

c232

2

i00u

isv

C235

1p2sv

31

2c

$201b

S20lc

820k

_

g201

(:

SEPARATE

RANGE

CHANNEL

SELECT

R23

220K

2

FULL

RANGE

3

CENTER

WOOFER

Si

Cc

wu

U

2

7

ee

$80

[2,390

8

2sc6s50@

2sc281®

23

TR206

TR207

2

c

30

1

POWER

AMP

UNIT

DIHv-23®

D2

HV-23®

R331

Dp

si

1

TR4

pox)

aaa

a

2scess®

D3

HV-23©

D4

Hv-23©

D5

HV-23@

Dé

HV-23©

C305

R301

3aV'mee

100K

Ac

SOURCE

FUSE

ZA

ov

TRe

so]

v2

|

2sc6es

®

$0401

VOIG

$0402

VOIG

$0404

VOIG

-_———

R412

22

R413

0.5

IW

of

R414

22

O08]

nnn]

INS4AT

Rais

‘05

Iw

Raig

22

o

mwac

R417

OS

Iw

f

R418

22

43

cored

+8

Hitachi IA-1200 User manual

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