Pioneer A-7 User manual

ORDER

NO.

ART-597-0

NON

SWITCHING

AMP

STEREO

AMPLIFIER

A-7

MODEL

A-7

COMES

IN

SIX

VERSIONS

DISTINGUISHED

AS

FOLLOWS:

Type

Voltage

Remarks

|

HE

220V

and

240V

(Switchable)

Europe

model

aaa

3

HB

220V

and

240V

(Switchable)

U.K.

model

|

KU

120V

only

U.S.A.

modei

=.

=

120V

only

Canada

model

110V,

120V,

220V

and

240V

(Switchable)

U.S.

military

modet

S

110V,

120V,

220V

and

240V

(Switchable)

General

export

model

|

This

service

manual

is

applicable

to

the

HE

and

HB

types.

When

repairing

the

KU,

KC,

S/G

and

S

types,

please

see

the

additional

service

manual.

Ce

manuel

d’instruction

se

refére

au

mode

de

réglage,

en

frangais.

Este

manual

de

servicio

trata

del

método

de

ajuste

escrito

en

espanol.

CONTENTS

1<,

SPECIFICATIONS

24.¢

sn

ins

ad

sensi

wedsn

2

8.

ELECTRICAL

PARTS

LIST............---

oe

2.

FRONTPANEL

FACILITIES..............

3

9.

SCHEMATIC

DIAGRAM..............0..

25

S..

iPARTS

LOCATION,

és.

So

canatpaeneeadeyers

6

10;

PACKING’

s.cciqg

an

cuniarny

are

aaa

ae

32

4.

CIRCUIT

DESCRIPTIONS................

8

11;

ADJUSTMENTS

¢

05

edulis

Uae

ed

eerie

as

33

5.

BLOCK

DIAGRAM............-5+++-555

9

REGEAGE

a3

anor

eacsltee

y

base

ad

inten

etned

34

6.

EXPLODED

VIEWS

..............--000-5

1

PIUSTES

coho

vic

above

Goma

hteautecdlvean®,

x2

35

7.

P.C.

BOARDS

CONNECTION

DIAGRAM......

17

PIONEER

ELECTRONIC

CORPORATION

4-1,

Meguro

1-Chome,

Meguro-ku.

Tokyo

153,

Japan

U.S.

PIONEER

ELECTRONICS

CORPORATION

&5

Oxford

Drive.

Moonachie,

New

Jersey

07074,

USA.

PIONEER

ELECTRONIC

(EUROPE)

N.V.

Luithagen-Haven

S,

2030

Antwerp,

Belgium

PIONEER

ELECTRONICS

AUSTRALIA

PTY.

LTD.

178-184

Boundary

Road,

Braeside,

Victoria

3195,

Australia

YU

©

DEC.

1980

Printed

in

Japan

1.

SPECIFICATIONS

Amplifier

Section

Continuous

Power

Output

is

70

watts*

per

channel,

min.

at

8

ohms

from

20

Hertz

to

20,000

Hertz

with

no

more

than

0.007%

total

harmonic

distortion.

Continuous

Power

Output

at

1

kHz

(both

channels

driven)

T.H.D.

0.007%,

Bohms

..............08

78

watts

per

channel

Total

Harmonic

Distortion

(20

Hertz

to

20,000

Hertz,

8

ohms,

from

TUNER)

continuous

rated

power

output

.......

No

more

than

0.007%

35

watts

per

channel

power

output

..

No

more

than

0.005%

Intermodulation

Distortion

(50

Hertz:7,000

Hertz

=

4:1,

8

ohms,

from

TUNER)

continuous

rated

power

output

.......

No

more

than

0.005%

35

watts

per

channel

power

output

..

No

more

than

0.003%

Damping

Factor

(20

Hertz

to

20,000

Hertz,

8

ohms)

cds

shea

heat

crowdba

beleuee

vic

hontes

nes

abies

Pe

GONG

Ga

Rooke

aR

Aeeeee

60

Input

Sensitivity/Impedance

PHONO

MM

........c2cccesceeeceeetereeeeeees

2.5

mV/50

kilohms

PHONO

MC

1...

2.

cee

cceeeenecee

este seen

eens

0.25

mV/100

ohms

TUNER,

AUX,

TAPE

PLAY

1,

2

..........

150

mV/50

kilohms

Phono

Overload

Level

(T.H.D.

0.0015%,

1,000

Hz)

PHONO:MM

icc

ciiesecccsdeesesceetssscsecdssescacsenssessves

200

mV

PHONO'MG:

ccoveceschisendemesssscsvetatacessrsvsniedeeneneres

20

mV

Output

Level

TAPE

REC

12s

te

csssscitiessewudeces

Pavececs

150

mV

Speaker:

is.

cccccsiccevisvetseccbenedes

A/OFF,

B/OFF

(6~16

2)

Frequency

Response

PHONO

MM

(RIAA

Equalization)

Racudileodudtedes

tua

chewtavenchworuas

sate

20

Hz

to

20,000

Hz+0.3

dB

TUNER,

AUX,

TAPE

PLAY

1,

2.....

5

Hz

to

100,000

Hz*$

dB

Tone

Control

BASS

ees

ieecintaiied

cc

dennbaeneconsenehenetenes

tes

+10

dB

(100

Hz)

TREBLE

visdt

sccetvsecaveteetactetcertertenenseueeens

+10

dB

(10

kHz)

Filter

LOW

(SUBSONIC)

........ccceceeeee

eee

es

20

Hz

(6

dB/oct.)

Loudness

Contour

{Volume

control

set

at

—40

dB)

iikiweStion

cee

add

ola

eaew

needed

cee

+9

dB

(100

Hz),

+3

dB

(10

kHz}

Hum

and

Noise

(IHF,

short

circuited

A

network)

PHONO.

MM)

icecczcicetcccstiec

eat

ees

sn.

tea

onde

deegsenane

88

dB

PHONO

MC

oeciceciccescsseceae

ad

obaecsnacssttassactaber

doses

70

dB

TUNER,

AUX,

TAPE

PLAY

1,

2

.......ecceceeeeceee

eee ees

110

dB

Hum

and

Noise

(DIN,

continuous

rated

power

output/50

mW)

PHONO

MM

........cccececscncec

ee

etecenteneneeeneeees

80

dB/66

dB

PHONO!

MGo

tos

vecasecatasegneoedt

atepetotecds

even?

70

dB/65

dB

TUNER,

AUX,

TAPE

PLAY

1,

2...............0085

95

dB/69

dB

Mini

sees

dedeszsea

teceenueseessteueaeset

vee

ccisebspniedenvevesicdons

—20

dB

Miscellaneous

Power

Requirements

HE,

HB

model

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

220/240

V

(switchable),

50/60

Hz

Power

Consumption

HE,

HB

models

..............cccccecsesececeeeecsenes

420

W

(max.)

Dimensions

...........0.cseseeeeee

420

(W)

x

132

(H)

x

423

(D)

mm

16-9/16

(W)

x

5-3/16

(H)

x

16-11/16

(D)

in

Weight

(without

package)

................66-

12.2

kg

(26

Ib

14

oz)

Furnished

Parts

Operating

Instructions

............0cceeeeeu

eee

1

(HE

mode!

only;

2)

*Measured

pursuant

to

the

Federal

Trade

Commission’s

Trade

Regulation

rule

on

Power

Output

Claims

for

Amplifiers.

NOTE:

Specifications

and

the

design

subject

to

possible

mofifications

without

notice

due

to

improvements.

2.FRONT

PANEL

FACILITIES

.

NON

SWITCHING

ANE

W

PIONEER

sTEREO

ameUFIER

4-7

()

POWER

SWITCH

Power

is

supplied

to

the

stereo

amplifier

as

soon

as

this

switch

is

depressed

to

the

ON

position.

The

power

is

turned

off

when

the

switch

is

released

to

the

OFF

position.

As

soon

as

the

power

switch

has

been

set

to

ON,

the

muting

circuit

is

actuated,

the

PROTECTION-RED

indicator

lights

up

red/and

after

about

6

seconds

when

the

muting

circuit

is

released,

the

indicator

goes

from

red

to

green.

(2)

TREBLE

CONTROL

This

is

used

to

adjust

the

treble

(high-frequency

range)

sound.

Rotate

this

control

with

the

LINE

STRAIGHT-OFF

switch

set

to

the

depressed

position.

The

treble

is

emphasiz-

ed

when

the

control

is

rotated

clockwise

from

its

center

posi-

tion

and

attenuated

when

it

is

rotated

counterclockwise.

3)

BASS

CONTROL

This

is

used

to

adjust

the

bass

(low-frequency

range)

sound.

Rotate

this

control

with

the

LINE

STRAIGHT-OFF

switch

set

to

the

depressed

position.

The

bass

is

emphasized

when

the

control

is

rotated

clockwise

from

its

center

position

and

at-

tenuated

when

it

is

rotated

counterclockwise.

(4)

FUNCTION

SWITCHES

These

are

used

to

select

the

sound

source.

At

the

left

of

each

switch

is

a

symbol

function

indicator

which

lights

when

the

corresponding

switch

has

been

depressed.

This

indicates

that

the

lighted

function

has

been

selected.

PHONO:

Depress

for

playing

records

on

a

turntable

con-

nected

to

the

PHONO

jacks.

TUNER:

Depress

for

listening

to

a

program

on

a

tuner

connected

to

the

TUNER

jacks.

AUX:

Depress

for

listening

to

the

sound

from

a

stereo

component

connected

to

the

AUX

jacks.

TAPE

1:

Depress

to

listen

to

a

tape

in

a

tape

deck

con-

nected

to

the

TAPE

1

jacks

or

to

monitor

a

recording.

TAPE

2:

Depress

to

listen

to

a

tape

in

a

tape

deck

con-

nected

to

the

TAPE

2

jacks

or

to

monitor

a

recording.

NOTE:

Depress

only

one

FUNCTION

switch

at

a

time.

The

desired

pro-

gram

source

may

not

be

selected

if

two

or

more

switches

are

depressed

at

the

same

time.

©)

VOLUME

CONTROL

This

is

used

to

adjust

the

volume

of

sound

heard

through

the

speakers

or

headphones.

No

sound

is

heard

when

it

is

set

to

the

‘‘0’

position.

To

increase

the

volume,

rotate

this

control

slowly

clockwise

(().

©)

MUTING

-20

dB

SWITCH

The

volume

is

attenuated

by

—20

dB

when

this

switch

is

depressed

to

the

ON

position

(MUTING

indicator

lights).

The

switch

can

be

used

effectively

when

the

stylus

descends

on-

to

the

record

during

record

play,

when

the

sound

is

to

be

turned

down

temporarily

and

when

you

want

to

adjust

the

sound

precisely

as

you

listen

to

a

program

source

under

low

sound

level

conditions.

@

PHONES

JACK

Connect

the

plug

on

your

headphones

to

this

jack

when

listening

to

a

program

in

private.

To

listen

to

a

program

through

the

headphones,

release

both

the

SPEAKERS

A

and

B

switches.

©

REC

OUT

SELECTOR

SWITCH

This

is

used

to

select

the

output

signal

which

is

fed

out

to

the

TAPE

REC

jacks.

COPY

2

>

1:

COPY

1

>

2:

SOURCE:

PHONO:

TUNER:

AUX:

The

output

signal

is

fed

out

from

the

TAPE

2

PLAY

jacks

to

the

TAPE

1

REC

jacks

(when

dubbing

a

tape

from

TAPE

2

to

TAPE

1).

The

output

signal

is

fed

out

from

the

TAPE

1

PLAY

jacks

to

the

TAPE

2

REC

jacks

(when

dubbing

a

tape

from

TAPE

1

to

TAPE

2).

The

output

signal

of

the

program

source

(PHONO,

TUNER,

AUX,

etc.)

selected

by

the

FUNCTION

switch

is

fed

out

to

the

TAPE

1

REC

and

TAPE

2

REC

jacks.

The

output

signal

from

the

PHONO

jacks

is

fed

out

to

the

TAPE

1

REC

and

TAPE

2

REC

jacks.

The

output

signal

from

the

TUNER

jacks

is

fed

out

to

the

TAPE

1

REC

and

TAPE

2

REC

jacks.

The

output

signal

from

the

AUX

jacks

is

fed

out

to

the

TAPE

1

REC

and

TAPE

2

REC

jacks.

@

MODE

SELECTOR

This

is

used

to

select

the

mode.

m

STEREO:

Set

here

for

ordinary

stereo

listening.

mMONO:

Set

here

to

mix

the

left

and

right

channel

stereo

input

signals

and

hear

them

in

mono

through

both

the

left

and

right

speakers.

LINE

STRAIGHT-OFF

SWITCH

When

this

switch

is

released

to

the

ON

position

(the

LIME

STRAIGHT

indicator

lights),

the

signal

from

the

input

jacks

is

directly

sent

to

the

power

amplifier

input

without

passing

through

the

tone

control

circuit.

When

this

switch

is

depressed

to

the

OFF

position,

the

input

signal's

tone

quality

can

be

adjusted

with

the

tone

controls.

()

PHONO

MM/MC

SELECTOR

SWITCH

Set

this

switch

to

the

position

corresponding

to

the

cartridge

used

when

playing

records

on

a

turntable

connected

to

tre

PHONO

jacks.

MM:

Set

here

when

using

an

MM

cartridge.

MC:

Set

here

when

using

an

MC

cartridge.

42

SPEAKERS

A/B

INDICATORS

These

light

when

one

of

the

SPEAKERS

switches

has

been

depressed.

(3)

MODE

INDICATOR

BALANCE

INDICATOR

(3

LINE

STRAIGHT

INDICATOR

This

lights

when

the

LINE

STRAIGHT-OFF

switch

has

been

released

to

ON

in

place

of

the

BALANCE,

MODE

and

TONE

indicators.

TONE

INDICATOR

This

lights

when

the

tone

control

circuitry

has

been

ac-

tuated,

(2

LOUDNESS

INDICATOR

This

lights

when

the

LOUDNESS

siwtch

has

been

set

to

ON.

SUBSONIC

FILTER

INDICATOR

This

lights

when

the

SUBSONIC

FILTER

switch

has

been

set

to

ON.

(3

BALANCE

CONTROL

This

is

used

to

adjust

the

balance

of

the

sound

from

the

left

and

right

channels.

When

rotated

clockwise

from

its

center

position,

the

volume

of

the

left

(L)

channel

is

reduced;

when

rotated

counterclockwise,

the

volume

of

the

right

(R)

chan-

nel

is

reduced.

To

adjust

the

balance,

first

set

the

BALANCE

control

to

its

center

position,

set

the

MODE

selector

to

MONO

and

rotate

the

control

so

that

the

sound

seems

to

be

coming

from

the

midpoint

between

the

left

and

right

speakers.

@0)

SPEAKERS

SWITCHES

These

are

used

to

select

the

speakers

through

which

you

will

listen

to

the

sound.

When

one

of

the

switches

is

depressed,

the

corresponding

speaker

indicator

will

light

to

indicate

that

the

selected

speakers

are

now

working.

A:

The

sound

is

heard

from

the

speakers

connected

to

the

speaker

A

terminals.

B:

The

sound

is

heard

from

the

speakers

connected

to

the

speaker

B

terminals.

No

sound

will

be

heard

when

SPEAKERS

A

and

B

switches

are

both

released.

This

is

the

position

at

which

the

sound

can

be

heard

through

the

headphones.

@)

SUBSONIC

FILTER

SWITCH

The

subsonic

filter

with

the

15

Hz

cutoff

frequency

is

ac-

tuated

when

this

switch

is

depressed

to

the

ON

position

(the

SUBSONIC

FILTER

indicator

lights).

a

This

filter

serves

to

attenuate

frequencies

lower

than,

20

Hz

with

a

6

dB/oct

slope

and,

therefore,

it

can

be

used

to

sup-

press

the

ultra-low-range

noise

which

is

generated

by

record

warp

and

other

factors.

This

noise

cannot

actually

be

heard

by

the

ear

but

it

can

cause

cross

modulation

distortion

and

even

speaker

damage.

Use

this

switch

when

required

during

record

play.

Q2)

LOUDNESS

SWITCH

The

bass

and

treble

sound

is

emphasized

when

this

switch

is

depressed

to

the

ON

position

(LOUDNESS

indicator

lights)

under

low

volume

listening

conditions.

When

the

volume

of

sound

is

low,

the

capability

of

the

ear

to

pick

up

the

bass

and

treble

sound

drops

off,

compared

with

high

volume

listening

conditions.

The

LOUDNESS

switch

compensates

for

this

characteristic

of

the

ear.

The

bass

and

treble

are

emphasized

when

the

switch

is

set

to

ON

and

the

sound

comes

alive

even

when

the

volume

is

low.

@)

REC

OUT

1,

2

INDICATORS

These

indicate

the

tape

deck

which

is

recording

in

accor-

dance

with

the

position

selected

by

the

REC

OUT

SELEC-

TOR

switch.

@)

PROTECTION-RED

INDICATOR

This

lights

in

red

or

green,

depending

on

the

operating

mode

of

the

power

protection

circuit.

@5)

REC

SELECTOR

INDICATOR

This

indicates

the

program

source

(PHONO,

TUNER,

AUX,

etc.)

being

recorded

in

accordance

with

the

position

of

the

REC

OUT

SELECTOR

switch.

@6)

MUTING

INDICATOR

This

lights

in

accordance

with

the

position

of

the

MUTING

switch.

@)

OUTPUT

POWER

8

2

METER

This

indicates

the

output

level

when

speakers

with

an

8-ohm

impedance

are

connected

to

the

speaker

terminals.

L

is

for

the

left

channel

and

R

for

the

right

channel.

FUNCTION

INDICATORS

The

indicator

corresponding

to

the

selected

FUNCTION

switch

lights.

3.

PARTS

LOCATION

NOTES:

e

Parts

without

part

number

cannot

be

supplied.

e

The

A

mark

found

on

some

component

parts

indicates

the

importance

of

the

safety

factor

of

the

part.

Therefore,

when

replacing,

be

sure

to

use

parts

of

identical

designation.

e

For

your

Parts

Stock

Control,

the

fast

moving

items

are

indicated

with

the

marks

xx

and

*.

xk

GENERALLY

MOVES

FASTER

THAN

x.

This

classification

shall

be

adjusted

by

each

distributor

because

it

depends

on

model

Front

Panel

View

number,

temperature,

humidity,

etc.

Push

knob

(C)

:

AAD-340

Function

knob

(A)

AAD-341

eee

]

Function

knob

(B)

AAD-342

Knob

(B)

AAB-259

Function

knob

(C)

AAD-343

Push

knob

(A)

AAD-338

OT

Knot

(A)

Front

panel

assembly

AAB-258

ANB-980

Door

assembly

Function

knob

(D)

ANB-975

AAD-344

Push

knob

(C)

Function

knots

(E)

AAD-340

AAD-345

Center

plate

ANR-331

ANN-333

Front

View

with

Front

Panel

Removed

*

Variable

(TREBLE)

ACT-144

%

&

Rotary

switch

ASK-154

Variable

(VOLU

ME)

ACT-706

{

!

%

Variable

(BASS)

_F

ACT-144

Phares

jack

AKN-O

229

A\

&*

Push

switch

(POWER)

ASG-535

*

Variable

(BALANCE)

yr

Power

adiccator

ACV-143

AAV-3(1

Top

View

Power

supply

assembly

Switch

assembly

GWR138

AWS-154

EQassembly

AWF-048

J\

%&

Power

transformer

Z

ATT-770

Capacitor

assembly

220V/240V

GWR-131

Power

amplifier

assembly

AWH-104

Tone

control

assembly

GWG-152

Function

switch

assembly

GWN-185

Bottom

View

Switch

assembly

Function

switch

assembly

GWM-185

Power

amplifier

issembly

AWH-104

Capacitor

assembly

GWR-131

EQ

issembiy

AW!-048

Switch

issembly

AWS-1%4

A-7

Rear

Panel

View

jack

6P

AKB-079

jack

4P

AKB-078

Terminal

(SPEAKER}

AKE-055

4.

CIRCUIT

DESCRIPTIONS

The

circuitry

of

the

A-7

is

basically

the

same

as

that

of

model

A-8

with

the

exception

of

following

sections.

For

details

of

circuit

description,

please

see

the

circuit

description

of

the

model

A-8.

1.

The

A-7

equalizer

amp

can

not

be

switched

between

MM

R

LOAD

and

MC

C

LOAD.

2.

The

power

amplifier

ass’y

differs

from

the

drive

circuit

A-8

at

the

final

stage.

Bonnet

case

ANE-330

rN

.

2\%*

Line

voltage

selector

AKX-057

“\

Strain

relief

AEC-327

/\,

AC

power

cord

ADG-051

(HB)

ADG-041

(HE)

Mark

Part

No.

Symbol

&

Description

CCDSL

680J

50

CKDYB

472K

50

CKDYB

471K

500

CKDYF

1032

50

CQMA

102K

250

RESISTORS

C41,

C42

C57,

C58

C53,

C54

C35, C36, C45,

C46

C37,

C38

Note:

When

ordering

resistors,

convert

the

resistance

value

into

code

form,

and

then

rewrile

the

part

no.

as

before.

Mark

Part

No.

Symbol

&

Description

*&

ACP-019

A

RO“%PMFOOO

J

Vso

we

RD%PMFOOO

J

RD%PMOOO

JNL

A

RD%PSF

2215

RD%PSOOO

J

RD%PMOOO

J

SEMICONDUCTORS

Mark

Part

No.

kk&

2SK129A

kk

2802291

&&

=2SA979

ke

=25C2259

*&*&

2SA733A

(2SA1015)

(2SA1115)

(2SA992)

kk

2SA905A

ww

2SC1I91I5A

(2SC1915)

*#*&

=

2SC2603

(2SC1400)

wkk&

2SA1115

(2SA750)

kk

2SA893A

*&*&

=

2SC1890A

*&*&

=

28C2275

kk

2SA985

*&%*&

=2SB507P

(2SB834)

(2SB682)

&%&

=2SD313P

(2SD880)

(2SD712)

wk*e

NJM4558DX

(uPC4558C)

%&

181555

(US1035)

(1$2076)

(1$2473)

*&

=

MZ-047

%&

MZ-150

(W2Z-150)

VR1,VR2_

Semi-fixed

1002

(B)

R31,

R32,

R39,

R40,

R61,

R62,

R91,

R92,

R121, R122,

R41,

R42

R35—R40,

R43, R44,

R63,

R64,

R69—R72,

R91—RYIGB,

R113,

R114

R3,

R4,

R9Q—R12

R111,

R112

R73—R76

R1,

R2,

R5,

R6,

R15—R26,

R29,

R30,

R33,

R34,

R45—R60,

R65—

R68,

R77—R84,

R89,

R90,

R95—

R98,

R107—R110,

R115—R120

Symbol

&

Description

Qi,

Q2

Q3,

Q4

Q5,

O6

Qg,

Q10

Q11,Q12

Q13,

Q14

Q15,

Q16

Q17,

Q18, Q23,

Q24

Qi9—Q22

Q25,

026

Q27,

Q28

Q29,

Q30

Q31,

Q32

Q101

Q102

Q33

D1—D4,

D7, 08,

D13—D20,

D25—

D28,

D39-—D42

021-—D24

D33,

D34

Mark

Part

No.

Symbol

&

Description

*

MZL240

*

=STV2H-O

OTHERS

Mark

Part

No.

TH102-2

TH103-2

D101,

D102

D11,D12

Symbol

&

Description

TH1,

TH2

TH3,

TH4

SWITCH

ASSEMBLY

(AWS-159)

RESISTORS

Note:

When

ordering

resistors,

convert

the

resistance

value

into

code

form,

and

then

rewrite

the

part

no.

sa

before.

Mark

_

Part

No.

Symbol

&

Description

RD%PM

OOO

J

R1-R11

SWITCH:

CAPACITOR-OTHER

Mark

Part

No.

xk*

ASX-156

ACE-075

CKDYB

391K

50

AKB-078

Symbol

&

Description

$1

Side

switch

C1

C2—C5

jack

4P

PROTECTION

ASSEMBLY

(GWM-236)

CAPACITORS

Mark

Part

No.

CQMA

473K

50

CEA

R47M

50L

CEA

471M

6L

CEA

101M

16L

CEA

2R2M

100L

RESISTORS

Symbol

&

Description

C201,

C202

C203,

C204

C205

C206

C207

Note:

When

ordering

resistors,

convert

the

resistance

value

into

code

form,

and

then

rewrite

the

part

no.

as

before.

Mark

Part

No.

RS1P100J

RS2PL100J

RS1P391J

RO%PM

OO

J

SEMICONDUCTORS

Mark

Part

No.

Symbol

&

Description

R201,

R202

R203,

R204

R215

R205—R214

Symbol

&

Description

*&*

=2SC1890A

**

=2SC945A

*&*

2SA733A

*&*

=

2SC1384

*

182471

*

182473

(1S1555)

(1$2076)

*

=MZ-150

(WZ-150)

OTHER

Mark

Part

No.

kk

ASR-068

Q201,

Q202

Q203,

Q204

Q205

Q206

D201—D204

D205

D206

Symbol

&

Description

Relay

RL4

4.P.C.

BOARD

PATTERN

4.1

EQ

ASSEMBLY

(AWF-054)

Qinas

Qs a6

Q7

Qs6

Qa

~ai2

O1~6,9~14

182473

07.8

MZL320

Qis~

Qe

|

wv

Ahn

4

4.2

POWER

AMPLIFIER

ASSEMBLY

(AWH-117)

4.4

PROTECTION

ASSEMBLY

(GWM-236)

aze

Q30

Q24

G20

aze

ato2z

927

23

Q26

3

Q205

Q204

Q201Q202

a6

Qioas

azz

arz

Q4

Qa

a2

Qe

a2

aio

gar

azo

ais ais

ai

aisas

ait

Q21.ai7

a9 as

Q33

Q203

Q:

Q2

Q

VR2

vai

Q206

ase

(

accra:

“sD?

STV2H-O

:

01~4,7.8.13~20

‘

Reyes

D201~

204

1824714

4.3

SWITCH

ASSEMBLY

(AWS-159)

aN

yh

pee

7

pap

iliaad

|

optiast

Q!

Ci

°

ac)

J

©,

3.

Po

9

9,

Q

oo]

%,

|

Oo

o,

9

9]

ef

oO

°

a

MA

|

4

i

5.

SCHEMATIC

DIAGRAM

TONE

CONTROL

Ass’y

caer

[SWITCH

Ass!

used

-

y

(8)

40ma

{Teoma

2

(3)

a

a a

Lo"

per

|

v2

Y

feny

a

ase

SE

}

ON

|

EI)

Fa50

F470

Q301

pPcassec

cs24

TONE

AMP

:

Or]

*)

cses

5Sc-279

As

|

4

47725

Shama

©)

'

R27 R29

47

C)

oan:

oc

RIOT

C25

.

7

(NP)

oe.

RNO

WN

100k

.

|

R102

cio4

=

sihts

\

im

bar

ee

=

:

a

oz

3

2®

pe

[=z]

nae

BR

pet

2k

iam

BT)

—,

Oy)

R301

1

R309

co

R302 C302

R30

C32

EQUALIZER

Assy

AWF-054

y

Riso

Sy

pet

——

Sg

—y

Fe

=

St

-

=:

one

7

G1)

©

SE

sree

©

Y)

(6)

+|c103

1

o7

th

ak

(5)

;

3s

R109;

100

Se

Qs

100

)

ery

rs

a

1

ios

‘ate

35)

Loo

---------------

a

@)

'

Ru

jiN4

—

2SKITO

07,8

MZL270

05,6

28C2291

09X14

182473

(4)

_SWITCH

Ass'y(C)

a7

2)

Q7,8

=

2SAINS7A/

Q9,10

2SA872A

RLTSRECAY

}

yg

Q1,12

281735

ASR-O71

vRsot~1

$34

EQUALIZER

AMP

1ox_

fy,

e432

4

nan

ese

:

besa

13

2S0313P

tox

J,

|

X32

f

J

Q14

2S88507P

ae

preg

vRsot

Poaare

y

QI7

=

2SC1890A

Q8

2SA893A

STABILIZER

+

CONNECTOR

Ass'y

(0)

{rac

6a

OFF

R404

220

J

MON

HcOoOOtTYErFRKLG

RO

SWITCH

Ass'y

(A)

CONNECTOR

‘

FUNCTION

SWITCH

AWS

-159

Ass'y

(BAC)

36}

ss

GWM-185__

Assy

Js

Jos

}s4]J65

e0)s9fe<jespee

sz

Jez

_

jst

2

SWITCH

Ass’y

(8)

(2/2)

c203

S4°3-1

$4-5-2

.

as

OFF

S$4-6-1

$4-6-2

c7

63

0.47

0.047

os

|

Qi

TA7T3I8P-A

COMPRESSOR

28

SI:

REC

OUT

SELECTOR

ASK

~

156

——.

SOURCE:

PHONO

N

se.

TUNER

Q2,3

2SC945A

LAMP

ORIVE

RELAY

iii

eaMwxnoveozerxe-

rH

a

at

ae

'

1

t

rs

-

RIOD

100

ae

aux

Lex

ffi)

ie

J

Tey

S3:,wuring

96

m

Sei

A

d

ASG-

278

°

?

q

a“

(MUTING)

(PROTECTION)

(OPERATING)

PLIN3:

LAMP

Assy

epee

BV

50mA

|

AEL-182

RIOT

'

5.6

a

eee

ee

ere

MUT

SWITCH

Ass'y

ie

a

(s})——

-

S|

GWS

-285

ue

VOLUME

Assy

A

GWM-182

ho

ow

=>

on

o>

a)

POWER

AMP

Ass'y

AWH

-117

Q,2

2SKi29A

Q3,4

2SC2294

Q5,6

2Sa979

Q9,10

2S¢2259

QUA2

2SA7334

Q134

2SA905A

QIS,16

2SCIS15A

Q17,18,

23,24

2SC2603/A/

QI9~V

22

2SAIIIS/A/

Q25,26

2S5A893A

Q27,28

2SC1890A

Q29,30

2SC2275

Q31,32

2Sa985

POWER

AMP

|

Parente

ry

025~

28,

39~

Q33

NJM45580X

J

DC

SERVO

AMP

$SASS.

5

Hig

BA

fea

CONNECTOR

Ass'y(F)

!

rq

1S2471

00

O21~

24

Mz-047

/63

033,34

=

MZ-150

DIOI102

MZL240

aot

2S58507P

QO2

2S50313P

REGULATOR

a

le

J

at

nN

ba

Ba

“eae

2

a

ABC

OE

F

y

(Basa)

g

|

10

|

‘1

PROTECTION

Assy

1,

RESISTORS:

GWM-

236

Indicated

in

2,

“UW,

+5%

tolerance

unless

otherwise

noted

k

:

ki2,

(a=

ara

a

=.

og

|

M2

M&1,

(F)

:

+1%,

(G):

2%,

(K):

«10%

tolerance

’

L2or

t

U0

RLa-4

o

Q201,202

2SCiI890A

208

25A733A

2.

CAPACITORS:

A ;

201

AYSS3

Q203,204

2SC945A

Qe2es

251384

Indicated

in

capacity

(wF)/voltage

(V)

unless

otherwise

noted

p-

pF

8201

0.047

20)

——

PROTECTION

——

0206

Indication

without

voltage

1s

SOV

except

electrolytic

capacitor.

10.01W)

3

VOLTAGE,

CURRENT:

[J

Signat

voltage

at

70

W+

70W_—

?

output

(1kHz)

“TJ

OC

voltage

(V)

at

no

input

signal

)

203

ca

MZ~150

=

—_

Value

in

(

}

is

DC

voltage

at

rated

power

<2

mA:

OC

current

at

no

input

signal

4,

OTHERS:

a>

:

Signal

route.

Q1,3

28C2525

Q2,4

2SA1075

POWER

AMP

@

:

Adjusting

point.

The

A\

mark

found

on

some

component

parts

indicates

the

im-

Portance

of

the

safety

factor

of

the

part.

Therefore,

when

replacing,

be

sure

to

use

parts

of

identical

designation.

SWITCHES:

St:

REC

OUT

SELECTOR

2=1-—

1&2

-

SOURCE

—-

PHONO~

TUNER

-

AUX

D201~

204

0205

1$2471

182473

_——_——

RL4:

RELAY

ASR-O68

S2-1)

FUNCTION

(PHONO)

ON

-

OFF

S2-2:

FUNCTION

(TUNER)

ON

-

OFF

$2-3:

FUNCTION

(AUX)

ON

-

OFF

fe

S2-4:

FUNCTION

(

TAPE

1)

ON

~

OFF

=

[|

ae

as

=

S2-5

FUNCTION

(

TAPE2)

ON-

OFF

‘

<i

$3:

MUTING

(-2008)

ON

~

OFF

_

SWITCH

_Ass'yiC)

(2/2)

2200p

$4-1:

PHONO

(MC)

ON

-

OFF

|

5

S4-2:

PHONO

(MM)

ON

~

OFF

ol’

S4-5:

LOUDNESS

ON

-

OFF

Is5-3-3

J

PS

i}

SPEAKER

(A)

54.6:

SUBSONIC

ON

-

OFF

elal®

SS-1:

LINE

STRAIGHT

ON

-

OFF

ii

5-2:

MODE

STEREO-

MONO

4

x

S5-3:

SPEAKER

(A)

ON

—

OFF

S5-4:

SPEAKER

(8)

ON

~

OFF

©

S6:

POWER

ON

-

OFF

|

©

DrRAKER

Ce)

s7

LINE

VOLTAGE

SELECTOR

220V-240V

ot

|

®

8

The

underlined

indicates

the

switch

position

ce

This

is

the

basic

schematic

diagram,

but

the

actual

circuit

may

vary

ss

So536

2200p!

due

to

improvements

in

desi

jn

|

ASG-280

POWER

SUPPLY

Ass'y

GWR-139

wn

Te

poe

CEMGA:

6]

TAT

CAPACITOR

ons

WY

Ass’y

750

GWR-131

HEADPHONE

Assy

6.

2)

0

Vaid

a

(5)

:

+

x

AC

220v

108

[ctor

¥

240v

470

|

470

50/60He

223

1/B

ony

<u

pet

DIO1~,

104

SR3AM~4

SREGULATOR

oiio~w

its

“are

10E2

ADG

-

04!

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!

0105

182471

6

O14

=MZ-130

$6:

POWER

.

:

ASG-536

S7

UNE

VOLTAGE

SELECTOR

AKX

-O57

pOVvOREr

ROC

=-

2

O%mMo

Aw»

a

INDICATOR

Ass'y

GWX-571

_

nes

LEO

METER

MODULE

AAV-301

_

8

=

se

——_——.

c

OIn3)

=

AEL

-

325

|

r)

04x23

AEL-346

i

e

_—

fae

sianeani

(suasonicy

(TAPE1)

(TUNER)

=

(TaPE2)

(AUX).

(PHONON

F

(MODE)

{LOUONESS)

(MM)

(MC)

(TAPE2)

taux)

(PHONO)

{TAPE

1)

(TUNER)

‘

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8

a

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A)

(SP

BH{REC

D(REC2)

c

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02

t

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peo

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107

rt

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10

11

12

—_——

5.

BLOCK

DIAGRAM

EQ

AMPLIFIER

TONE

CONTROL

POWER

AMPLIFIER

OUTPUT

SPEAKER

(A)

SPEAKER

(B)

VRi:

TREBLE

VR2:

BASS

vRSOI

BALANCE

fe"

Con

cor)

EE.

Ao

?

|

vei

TUNER

PHONES

AUX

PROTECTION

CIRCUIT

Q

PLAY

1

@-s-z

PLI

(PROTECTION)

RL2

Se-t

VR1i.

VOLUME

PROTECTION

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<S

iC

1SOmv

H

)

re

pera’

Sober

We

IA

Ae

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IS

|

$3-3

a

rs

PL3

UK,

(MUTING)

PLAY

2

|

Pe

pe

POWER

SUPPLY

CIRCUIT

VOLTAGE

REGULATOR

Rt

N

aw

_

OR

INDICATOR

CIRCUIT

+8

(+45v)

(FUNCTION)

EQ

AMPLIFIER

$2-5 S2-4

S2-3

TAPE

2

SPEAKER

(A)

s7

240v

sé

TAPE!

SPEAKER

(8)

LINE

STRAIGHT

(OFF)

AC

220/240V

AUX

50/60Hz

1

IE

I

aE

TUNER

PHONO

LOUONESS

SUBSONIC

(REC

SELECTOR)

TAPE

2

PHONO

(MM)

TAPE

|

PHONO

(MC)

SWITCHES

(POWER)

St:

REC

OUT

SELECTOR

S4-6.

SUBSONIC

ON

-

OFF

2-1-1"

2

—

SOURCE

-

PHONO

—

TUNER

-

AUX

S5-1:

LINE

STRAIGHT

ON

—

OFF

cH

$2-1:

FUNCTION

(PHONO)

ON-~

OFF

S5-2:

MODE

STEREO-

MONO

LCH

geasooooog

S2-2:

FUNCTION

(

TUNER)

ON-OFF

S5-3:

SPEAKER

(A)

ON

-

OFF

a

INPUT

RCH

IND.

2-3:

FUNCTION

(AUX)

ON

-

OFF

S5-4:

SPEAKER

(B)

ON

~

OFF

RCH

pl

va

adi

sme

$2-4:

FUNCTION

(

TAPE

1)

ON

-

OFF

S6

:

POWER

ON

—

OFF

INPUT

$2-5:

FUNCTION

(TAPE

2)

ON

-

OFF

S7

:

VOLTAGE

SELECTOR

220V~-240v

$3

MUTING

(-20d8)

ON

-

OFF

REC!

S4-1:

PHONO

(MC)

ON

-

OFF

S4-2:PHONO

(MM)

ON

-

OFF

S4-5:

LOUDNESS

ON

-

OFF

6.EXPLODED

VIEWS

Exterior

Components

—

aa

i

.

i)

rae

6s

/

aes

Ly

“Be,

es

t

gheesoace

he

xX

/

‘

,

wna

fleet

/

ox

Or

Na

\e

\

G

2609

x

/

x 0

Of/Nn

O-------

Orr

aw

as,

/

:

RES

Se

Yai

GSS

aay

are

:

MANY

HL.

ec]

W

Se

)

ff

©

=

ww

LEERY

aoe

SY

Lod

Parts

List

Mark

No.

16.

17.

18.

19.

20.

21.

22.

23.

24,

25.

26.

27.

28.

29.

30.

31.

Part

No.

VBZ30PO60F

MC

ANB-975

ANR-340

ANR-341

ANB-980

AAB-259

NK9OFUC

WA92F

140U100

VBZ30PO80FMC

AAB-260

ANR-331

AAD-340

ANR-333

AAB-258

AAD-338

AXC-001

AAD-341

AAD-342

AAD-343

AAD-344

AAD-345

ABH-045

AEC-564

AAD-339

ABA-193

AEC-083

VTZ40P120FMC

ANE-330

VBZ30PO80FZK

ABH-069

NOTES:

e

Parts

without

part

number

cannot

be

supplied.

e

The

A,

mark

found

on

some

component

parts

indicates

the

importance

of

the

Interior

Components

safety

factor

of

the

part.

Therefore,

when

replacing,

be

sure

to

use

parts

of

identical

designation.

Mark

e

For

your

Parts

Stock

Control,

the

fast

moving

items

are

indicated

with

the

marks

xk

and

k.,

xx

GENERALLY

MOVES

FASTER

THAN

kx.

This

classification

shall

be

adjusted

by

each

distributor

because

it

depends

on

model

number,

temperature,

humidity,

etc.

Description

Mark

No.

Screw

101.

Door

assembly

102.

Hinge

(L)

103.

Hinge

(R)

Front

panel

assembly

Knob

(B)

Nut

Washer

Screw

Knob

(C)

Center

plate

Push

knob

(C)

Cover

Knob

(A)

Push

knob

(A)

Door

mechanical

assembly

Function

knob

(A)

Function

knob

(B)

Function

knob

(C)

Function

knob

(D)

Function

knob

(E)

Spring

Knob

holder

(A)

Push

knob

(B)

Screw

Foot

assembly

Screw

Bonnet

case

Screw

Spring

Screw

3x6

(Black)

Part

No.

Description

Ring

Bottom

plate

Push

knob

spacer

A

**

A

ke

kk

A

ke

A

ke

>>

Parts

List

No.

16.

17.

18.

19.

20.

21.

22.

23.

24.

25.

26.

27.

28.

29.

30.

31.

32.

33.

34.

35.

36.

37.

38.

39.

40.

41.

101.

102.

103.

Part

No.

VBZ30PO60F

MC

AEC-352

AWH-104

AAV-301

GWX-571

ABN-046

AEL-152

ATT-770

VTZ40P080FMC

ABN-048

GWG-152

ABA-214

ABA-261

ASX-154

AEK-400

AEK-

405

ASG-535

VBZ30PO80FMC

STV2H-O

GWM-185

GWM-182

AEC-782

2SA1075-B

(2SA1075-G)

(2SA1075-x)

28C2525-B

(28C2525-G)

(28C2525-x)

ABA-258

ACH-230

GWR-131

AK

X-057

28C2525-B

(2S8C2525-G)

(28C2525-X)

2SA1075-B

(2SA1075-G)

(2SA1075-X)

AWS-154

AWF-048

GWM-181

AEC-327

ADG-051

ADG-041

BBT30PO80FZK

WA35F

100N080

ABA-176

AKE-055

GWR-

139

Description

Mark

No.

Screw

104.

Nylon

revet

105.

Power

amplifier

assembly

Power

indicator

106.

Indicator

assembly

107.

108.

Boss

109.

Lamp

assembly

110.

Power

transformer

220V/240V

Screw

111.

Washerfaced

nut

112.

113.

Tone

control

assembly

114,

Screw

115.

Screw

Rotary

switch

116.

Fuse

T4A

FU1

117.

118.

Fuse

T1.6A

FU2

119.

Push

switch

S6

120.

Screw

Varistor

121.

Function

switch

assembly

122.

123.

Volume

assembly

124.

Spacer

125.

Transistor

Q2

126.

.

127.

Transistor

Q1

128.

129.

130.

Screw

Capacitor

131.

Capacitor

assembly

132.

Line

voltage

selector

$7

133.

*

Transistor

Q3

134.

135.

*

Transistor

Q4

136.

137.

138.

Switch

assembly

139.

EQ

assembly

140.

Protection

assembly

Strain

relief

141.

AC

power

cord

(HB)

142.

AC

power

cord

(HE)

143.

144.

Screw

Washer

bis

Screw

Terminal

(SPEAKER)

ip

148.

Power

supply

assembly

nee

Side

frame

(L)

151.

152.

Lamp

holder

(A)

*hfe

of

Q1—Q4

should

have

the

same

value.

Part

No.

Description

Lamp

holder

(C)

P.C.B.

holder

(D)

Volume

holder

Sub-frame

Panel

stay

Plate

Jack

holder

P.C.B.

holder

(G)

=

P.C.B.

holder

(H)

Transformer

frame

Transformer

sub-frame

P.C.B.

holder

(B)

Wire

Power

switch holder

Lead

wire

guide

P.C.B.

holder

(E)

Arm

assembly

Arm

guide

Holder

Heat

sink

Heat

sink

holder

(A)

Terminal

2P

(GND)

=

Plate

Heat

sink

holder

(B)

Heat

sink

holder

(A)

Center

frame

Terminal

7P

(GND)

Side

frame

(R)

Heat

sink

holder

(C)

Heat

sink

P.C.B.

holder

(A)

Terminal

2P

(GND)

Rear

panel

Terminal

(GND)

P.C.B.

holder

(F)

Volume

assembly

Connector

assembly

=

Switch

assembly

Phone

assembly

Muting

switch

assembly

Switch

assembly

Connector

assembly

A

Connector

assembly

B

Connector

assembly

P.C.B.

holder

LED

holder

A

LED

holder

B

LED

holder

D

3

4

)

6

q26

Q6

Q30

Q8

ato are

azz

azar

a4 Q2

a24

a20

Q3z

azefae

QS

Q27

ast

ate

Q23

at

Qa~

ai2

Q13~

Qs

Ry,

yaaa,

F

UK

%,

|

]

RECAY”

"RL

SS

nig

a

ts

te.

a

coral,

1015

aie“28C

1400

R22

YES

SOP

Qi7.25¢1890A

‘

Q9,10

2862259

Q17,18,23.24

25¢1400

:

Qt,2

25K129A

AQ18

2SA893A

Qi,12

2SA733A

Q25,26

2SA893A

:

Q3,4

28c2291

Ab

~

Q13,14

2SA905

Q27,28

2SC1890A

.

Q5~8,19~22

AWH

:

6,9~14

182473

:

it

Q15.16

25C1915

Q29,30

2S¢2275

bi

2SA750

07.8

MZL320

aH

|

Q31,32

2SA985

EQUALIZER

Ass'y

AWF-048

CONNECTOR

Ass’y

(A)

PL3

(MUTING)

PLIN3

:

8V

50mA

(9)

Pei

ciad

arte

ene

eanaat

SWITCH

Ass’y

(A)

AWS

-

154

PL2

ra

(OPERATING)

uu

£

FUNCTION

SWITCH

Ass'y

GWM

-485

®

Q3

AN

QI7QI3Q2i

QI

Q7

QS

Q25

CONNECTOR

Ass’y

(D)

©

;

@

L

SPEAKER

(A)

R

L

|

SPEAKER

(8)

R

80

so

VOLUME

VER

AMP

Ass'y

SWITCH

Ass’y

(C)

Ass'y

(B)

©

AWH

-104

@e

F)

CONNECTOR

Ass’y

(B)

J

©

9eoos

©

fo

0005

80

0

Of

MUT

SWITCH

Ass’y

4

GWS-285

SWITCH

Ass’y

(B)

esoosoooo

ogee

sor

ONNECTOR

Assy

(C)

B

@®

@

®@

Qi,3

2Sc2525

Q2,4

2SAI075

HEADPHONE

Ass'y

203

a205

a204

92019202

0201~

204

1s2471

5

OAT

PROTECTION

Ass’y

D201

fr

n

i

qi

:

GWM

-

184

0208

132473

ahon

CONNECTOR

Ass’y

(

F)

CAPACITOR

Ass’y

GWR-1431

POWER

SUPPLY

Ass’'y

GWR

-139

CONNECTOR

Ass’y

(E)

INDICATOR

Assty

|

oo

ree

GWX

=

571

MODULE

S6:

POWER

O

“LINE

VOLTAGE

SELECTOR

Bererey

50/60Hz

Wee

oe

oJ)

le

poctgerallly

a

ee

eee!

:

B

External

Appearance

of

Transistors

and

ICs

2SA1075

28C2525

2SA750

Type:

No

2SC1400

Type

No.

i

2SA872A

Suffix

2SA893A

meee

2SC1890A

2SA733A

2SC945A

Lot

No

2SA905

2SC1735

hee

2801915

2SA985

28C2275

Lot

No

hre

€

c

B

hre

Type

No

2SB507P

2SB682

28D712

28C1384

2SC2259

28D313P

2SD836A

Type No

wot

No

E c

fr)

Type

No.

Lot

No

hre

Lot

No

—Lot

No

Type

No

2SK170

loss

Oo

$

Ss

loss

Type

No

Lot

Nom

Mark

2SK129A

5

8

4

1

uPC4558C

Index

9

If

lpnaat

ah}

TA7318P

28C2291

Type

No

Lot

No

hre

8.

ELECTRICAL

PARTS

LIST

NOTES:

e

When

ordering

resistors,

first

convert

resistance

values

into

code

form

as

shown

in

the

following

examples.

Ex.1

When

there

are

2

effective

digits

(any

digit

apart

from

0),

such

as

560

ohm

and

47k

ohm

(tolerance

is

shown

by

J

=

5%,

and

K

=

10%).

5602

56x

10!

O61

cies

ahs

ess

RD%PS

HEH

47kQ

47x

10°

BIB

i

ol,

Shes

RD&*PS

QB

0.52

ORG

2

Ase

ee

BE

ae

oe

RN2H

ORAK

12

O10

secrets!

dor

push

ne

nates

RSIPOMOK

Ex.

2

When

there

are

3

effective

digits

(such

as

in

high

precision

metal

film

resis-

tors).

5.62k2

562x100

5621.........

RN4%SR

SEAM

F

e

The

f\

mark

found

on

some

component

parts

indicates

the

importance

of

the

safety

factor

of

the

part.

Therefore,

when

replacing,

be

sure

to

use

parts

of

identical

designation.

e

For

your

Parts

Stock

Control,

the

fast

moving

items

are

indicated

with

the

marks

xk

and

*.

*x%

GENERALLY

MOVES

FASTER

THAN

x.

This

classification

shall

be

adjusted

by

each

distributor

because

it

depends

on

model

number

,

temperature,

humidity,

etc.

Miscellaneous

Parts

ASSEMBLIES

SWITCHES

Mark

Part

No.

Symbol

&

Description

Mark

PartNo.

AWF-048

EQ

assembly

wk

=ASX-154

GWR-139

Power

supply

assembly

A

xx

ASG-535

GWG-152

Tone

control

assembly

A\

ek

AKX-057

GWM-181

Protection

assembly

GWM-182

Volume

assembly

FUSES

GWM-185

Function

switch

assembly

Mark

Part

No.

AWH-104

Power

amplifier

assembly

AWR-220

Switch

assembly

A\

**

AEK-400

GWR-131

Capacitor

assembly

A

**

~AEK-405

GWX-571

Indicator

assembly

OTHERS

SEMICONDUCTORS

Mark

Part

No.

Mark

Part

No.

Symbol

&

Description

A

ye

ATT-770

A\

*&*

28C2525-B

Q1,

03

A

pees

(2SC2525-G)

A

ace

608

(2SC2525-X)

AEL-152

A

*&*

2SA1075-B

a2,

04

(2SA1075-G)

(2SA1075-X)

*hfe

of

Q1—Q4

should

have

the

same

value.

Symbol

&

Description

S1

Rotary

switch

(SPEAKER)

S6

Push

switch

(POWER)

S7

Line

voltage

selector

Symbol

&

Description

FU1

Fuse

T4A

FU2

Fuse

T1.6A

Symbol

&

Description

Power

transformer

220V/240V

Power

cord

(HE)

Power

cord

(HB)

Terminal

(SPEAKERS)

Lamp

assembly

Continued

on

page

29.

Pioneer A-7 User manual

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