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EF

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Hi-Fi

Component

Ampiifier

SERVICE

MANUAL

MODEL

PMA-830

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STATE

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TABLE

OF

CONTENTS

SPECIFICATIONS

Gaixtacte

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=

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4

METHOD

OF

ADIUSTMENTS

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ead

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ecdewd

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oeueetues

5

PRINTED

CIRCUIT

BOARD

PATTERNS

AND

PARTS

LIST

INPUT

TERMINAL

UNIT

SE

O2y

<c

Sa

ne

6

CONTROL

(A)

UNIT

$

MENG

2508

atoning

Aeneas

ae

ese

e

6

CONTROL

(B)

UNIT

E162

siete

hes

tabs

ee

es

9

POWER

SOURCE

AND

PROTECTOR

UNIT

ETC-280........

0.000

cece

eee

eee

eee

10

POWER

AMP

UNIT

BUX

0205.35

226

deve

Sulnne

enous

enn

butnts

11

WIRING

DIAGRAM

«4

2.02453,

peeaw

as

ce

cadn

deren

dade

ich

one

Posie

sees

s

14

en

OV

A-S30

ml

SPECIFICATIONS

MAIN

AMPLIFIER

SECTION

Type:

All

stages

pure

complementaly

push-pull

system

DC

circuit

Rated

Output

(both

channels

driven)

20

Hz

to

20

kHz

(at

8

ohm)

Class

B

operation:

Class

A

operation:

65

W

at

each

channel

(T.H.D.

0.01%)

15

W

at

each

channel!

(T.H.D.

0.005%)

1

kHz

(at

4

ohm,

T.H.D.

0.02%)

Class

B

operation:

Total

Harmonic

Distortion

Class

B

operation:

Class

A

operation:

{intermodulation

Distortion

60

H2/7

kHz

=

4/1:

Power

Bandwidth

Class

B

operation:

Class

A

operation:

Transmission

Characteristic:

Input

Sensitivity

:

Input

impedance:

Output

Impedance:

Signal

to

Noise

Ratio:

Output

Terminals

Speaker:

Headphone:

90

W

at

each

channel

less

than

0.01%

less

than

0.005%

less

than

0.01%

(at

equivalent

rated

output)

less

than

0.01%

{at

1

watt

output)

5

Hz

to

80

kHz

(IHF,

T.H.D.

0.05%)

5

Hz

to

100

kHz

(IHF,

T.H.D.

0.05%)

DC

to

100

kHz

“0

dB

(at

1

watt

output}

1

volt

r.m.s.

50

k

ohm

less

than

0.16

ohm

122

dB

A

&

B,

4to

16

ohm

Joad

A+8B,8

to

16

ohm

load

for

Stereo

Headphone

PRE

AMPLIFIER

SECTION

Pre

Amplifier

Output

Max.

Output:

Rated

Output:

Total

Harmonic

25

V

1V

Distortion:

0.003%

{at

3

V

output)

Equalizer

Amplifier

Output

Max.

Output:

25

V

(T.H.D.

0.01%

at

50

k

ohm

load)

Rated

Output:

320

mV

Input

Sensitivity/input

Impedance

Phono-1,

2:

2.5

mV

/50k

ohm

Tuner:

320

mV

/40

k

ohm

Aux.

Tape:

320

mV

/

40

k

ohm

Maximum

Allowable

Input

Phono:

200

mV

1

kHz

RIAA

Deviation:

less

than

+0.2

dB

(20

Hz

to

20

kHz)

Signal

to

Noise

Ratio

(IHF.

A

network)

Phono:

better

than

90

dB

{input

terminal

shorted}

Tuner,

Tape,

Aux:

better

than

105

dB

(input

terminal!

shorted)

Aux

—

Pre

Out

Frequency

Response

5

Hz

to

100

kHz

~

Tone

Control

Section

Variable

Range

100

Hz

+8

dB

10

kHz

+8

dB

0

,

28

Tone

Defeat:

Bass:

Treble:

Filter

Characteristic

20

Hz,

—6

dB/oct

Loudness

Control

Characteristic

100

Hz+7

dB

10

kHz2+6dB

AC

220V,

50

Hz

440

W

(at

max.

output

power)

Subsonic:

Low

range:

High

range:

Power

Source:

Power

Consumption:

Dimensions:

434

(W)

x

164

(H)

x

400

(D)

mm

17-5/64"

(W)

x

6-29/64”"

(H)

x

15-3/4"

(D)

Weight:

16

kg,

35.3

Ibs

These

contents

are

subject

to

alteration

without

prior

notice.

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PM

A-830

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PMA-830

mm

EXPLODED

VIEW

OF

CHASSIS

AND

CABINET

FRONT

SIDE

mum

PM

A-830

BACK

SIDE

—~5—

eae

OV

A-S30

a

CHASSIS

AND

CABINET

GROUP

PARTS

LIST

Part

Name

&

Descriptions

Part

Name

&

Descriptions

477006411

07

|

FIXING

SCREW

4110145204

|

CONTROL

BRACKET

(A)

;

4730353

TAPPING

SCREW

3

x

6

(2)

=

4610061121

|

RUBBER

SHEET

3

4110148502

|

SIDE

CHASSIS

59

2740037014

|

2SD427

(R)

or

(O)

TRANSISTOR

4

4140114205

|

SHIELD

COVER

60

4120372106

|

RADIATOR

BRACKET

(A)

5

4610074176

|

BLIND

61

4711809033

|

CROSS

PEN

SCREW

3

x

18

6

2120119002

|

SPEAKER

SWITCH

62

4753001051

|

3

TOOTH

WASHER

i

2558001007

|

OIL

CAPACITOR

0.01uF

63

2720024005

|

2S8557

(0)

TRANSISTOR

8

3930032019

|

PILOT

LAMP

6.3V

0.15A

64

INSULATING

SHEET

g

2124122008

|

POWER

SWITCH

65

4170077105

|

POWER

RADIATOR

10

4110144409

|

FRONT

CHASSIS

66

4120373105

|

RADIATOR

BRACKET

(B}

11

— —

67

MD-4232

WIRE

CLIP

12

_

—

68

4110147309

|

MAIN

CHASSIS

13

ADHESIVE

TAPE

69

2546031007

|

6800uF

50

V

CAPACITOR

14

BLIND

70

2050095102

|

EARTH

PLATE

15

4730354035

|

TAPPING

SCREW3x8

71

2P

CONNECTOR

16

1440375103

|

FRONT

PANEL

ASS.

72

4450020005

|

CORD

BUSH

17

1120161006

|

KNOB

ASS.

73

2062016001

|

AC

CORD

18

BLIND

SHEET

74

4610061118

|

RUBBER

SHEET

19

_

—

75

1050294001

|

BACK

PANEL

20

4711304033

|

CROSS

PAN

SCREW

3

x8

76

2070002007

|

TRANSISTOR

SOCKET

21 11

mm

NUT

ie;

PUX-020L

POWER

AMPLIFIER

UNIT

(L)

22

2048011101

|

HEAD

PHONE

JACK

78

3P

CONNECTOR

CORD

23

4110146106

|

CONTROL

BRACKET

(B)

73

—

—

24

1120160007

|

KNOB

ASS.

80

4140113002

|

INPUT

BRACKET

25

1120162209

|

KNOB

ASS.

81

ETC-143

INPUT

TERMINAL

UNIT

26

1120166108

|

LEVER

KNOB

82

— —

27

1430041007

|

PILOT

LENS

83

2020012005

|

FUSE

HOLDER

28

SC-1162

SPECIAL

SCREW

84

2061015087

|

FUSE

4.0A

TIME

LAG

29

1020063440

|

TOP

COVER

85

_

-

30

1220007057

|

SPACER

86

2335127009

|

POWER

TRANSFORMER

31

ETC-259B

CONTROL

(A)

UNIT

87

2050003000

|

3

T

LUG

TERMINAL

32

—

—

88

4752006002

|

6

mmS

WASHER

33

2110161109

|

100

k

ohm

x

2

POTENTIOMETER

89

4756012005

|

6

mm

NUT

34

2110162001

|

100

k

ohm

x

2

POTENTIOMETER

90

ETC-280

POWER

SOURCE

&

PROTECTOR

UNIT

35

2120114007

|

ROTARY

SWITCH

91

1P

CONNECTOR

ASS.

36

2120115019

|

FUNCTION

SWITCH

92

4P

CONNECTOR

CORD

37

2120127007

|

FUNCTION

SWITCH

93 3P

CONNECTOR

CORD

38

2110160100

|

50

k

ohm

x

2

POTENTIOMETER

94

2038004005

|

5P

CONNECTOR

CORD

39

8

mm

NUT

95

3P

CONNECTOR

CORD

40

7mm

NUT

96

2050070004

|

8P

TERMINAL

41

7mm

TOOTH

WASHER

97

2056037005

|

SHORT

PIN

42

9

mm

NUT

98

4770088002

|

4.1

mm

WASHER

43

9

mm

TOOTH

WASHER

99

2050043109

|

GND

TERMINAL

44

1050188405

|

BOTTOM

COVER

100

_

—

45

2124110007

|

LEVER

SWITCH

101

4140057207

|

BOARD

BRACKET

46

2120118003

|

ROTARY

SWITCH

102

2036043000

|

4P

CONNECTOR

BASE

47

2120117004

|

ROTARY

SWITCH

103

—

2034093052

|

3P

CONNECTOR

CORD

48

2124110010

|

LEVER

SWITCH

104

PUX020R

POWER

AMP

UNIT

(R)

49

2110163107

|

100

k

ohm

x

2

POTENTIOMETER

105

= a

50

4700009006

|

CROSS

PAN

SCREW3

x6

106

=

=

51

4P

CONNECTION

CORD

107

a

-_

52

ETC-277

CONTROL

(B)

UNIT

108

2030014048

|

1P

CONNECTOR

ASS.

53

1120163208

|

KNOB

ASS.

109

MD-5271

P.C.B.

SUPPORT

54

1040040003

|

FOOT

110

MD-4368

WIRE

CLIP

55

4730456014

|

TOPPING

SCREW

4

x

12

(2)

111

4753100004

|

4

mm

TOOTH

WASHER

a

56

7mm

NUT

112

4770006004

|

4mm

NUT

4410316005

|

DIN

PLATE

Sa

NS

Ot

abe

Beate,

SU

tl

it

A a

mu

PMA-S30

METHOD

OF

ADJUSTMENTS

DC

VOLTMETER

DC

VOLTMETER

L-CHANNEL

DS

{DIODE}

TRIZ0

(TRANSISTOR)

CONTACT

WITH

DIODE

AND

TRANSISTOR

VR5

VR3

(VR

6)

(VR

4)

R-CANNEEL

TR

13,D9

{TR

14,

D

10)

SYSTEM-A

=

210

TEST

POINT

SYSTEM-B

meee

PUX-020

POWER

AMP.

UNIT

SPEAKER

TERMINALS

DATA

FOR

ADJUSTMENTS

1.

Confirm

that

forming

has

been

effected

as

shown

in

the

drawing

for

D9

and

TR13,

and

D10

and

TR14,

respectively

of

the

L-

and

R-channels.

(PU

X-020)

2.

The

amplifier

switchs

should

be

set

as

follows:

(1)

SPEAKERS

switchs

to

“A”

system.

(2)

VOLUME

to

minimum

position.

(3)

DIRECT

COUPLE

to

OFF.

(4)

POWER

switch

to

OFF.

(5)

OPERATION

switch

to

“B”

position.

(6)

Confirm

that

a

U-sharped

short

pin

is

inserted

between

the

PRE-OUT

and

MAIN-IN

terminals.

3.

{1}

Connect

a

D.C.

voltmeter

to

the

SYSTEM-A

terminal.

(2)

Connect

a

D.C.

voltmeter

to

the

test

points

of

both

the

L-

and

R-channels

of

the

PUX-020.

Special

attention

should

be

paid

here

with

regard

to

the

polarities

of

the

test

point

voltages:

make

sure

that

16

is

—

and

17

+

for

the

L-chan-

nel,

and

that

35

is

—

and

36

+

for

the

R-channel.

4.(1)

After

setting

the

voltage

regulator

to

0

V,

switch

the

amplifier’'s

power

switch

on.

(2)

While

ovserving

the

indication

of

the

D.C.

voltmeter,

raise

the

power

supply

voltage

from

zero

to

the

rated

voltage

by

using

the

voltage

regulator,

and

carry

out

the

preliminary

adjustments

of

(3)

and

(4)

in

a

swift

manner.

(3)

By

adjusting

VR1

(L-channel)

and

VR2

(R-channel)

of

the

PUX-020,

regulate

the

speaker

terminal

voltage

to

the

ih

range

of

OV

+10

mV.

(4k

By

adjusting

VR5

(L-channel)

and

VR6

(R-channel)

of

the

PUX-020,

regulate

the

rest

point

voltages

to

12

mV

(10

to

14

mV)

[Collector

current

to

26

mA

(22

to

30

mA)].

5.

(1)

On

completion

of

the

preliminary

adjustments

described

above,

carry

out

the

main

adjustments

described

below.

(2)

“

By

adjusting

VR1

(L-channel)

and

VR2

(R-channel),

adjust

the

speaker

terminal

voltage

again

so

that

it

will

be

in

the

range

of

OV

+10

mV.

|

(3)

“Adjust

VR5

(L-channel)

and

VR6

(R-channel)

again,

regulating

the

test

point

voltage

to

17

mV_+1

mV

(Collector

current

to

26

mA

+2

mA).

(4)

With

the

above

adjustments,

the

speaker

terminal

voltage

adjustment

and

idling

current

adjustment

for

B-class

operations

have

been

completed.

6.

(1)

Change

over

the

OPERATION

switch

to

Class

A.

(2)

By

adjusting

VR3

(L-channel)

and

VR4

(R-channel)

of

the

PUX-020,

carry

out

adjustment

of

the

test

point

voltage,

regulating

it

to

470

mV

+10

mV

(Collector

current

to

1

A

+0.02

A).

7.

(1)

Switch

over

the

OPERATION

switch

and

effect

aging

for

10

minutes.

(2)

By

adjusting

VR3

(L-channel)

and

VR4

(R-channel)

of

the

PUX-020,

regulate

the

test

point

voltage

to

500

mV__

f.

+5

mV

(Collector

current

to

1.06

A

+0.01

A).

With

the

above

operations,

idling

current

adjustment

for

A-class.

operations

has

been

completed.

CAUTION

1.

Never

switch

off

power

until

the

idling

current

adjustments

for

Class-A

operations

have

been

completed.

2.

Special

attention

should

be

paid

in

handling

the

variable

resistors

used

for

adjustments,

i.e.,

VR3

and

VR4,

and

VR5

and

VR6,

as

they

can

be

easily

mistaken

for

one

another.

lf

by

mistake,

VR5,

or

VR6

has

been

used

for

the

idling

current

adjustment

for

A-class

operations,

readjustment

must

be

carried

out

(after

confirming

that

the

radiator

of

the

power

amplifier

has

cooled

down)

for

B-class

operations,

since

the

mistake

will

cause

a

deviation

in

the

adjustment

for

B-class

operations.

On

completion

of

this,

carry

out

adjustments

for

A-class

operations

again.

3.

The

adjustment

of

6.

(2)’’

should

be

effected

after

about

10

seconds

have

passed

following

switch-on

of

the

OPERA-

TION

switch.

ny

se

INPUT

TERMINAL

UNIT

PRINTED

CIRCUIT

BOARD

PATTERNS

AND

PARTS

LIST

INPUT

TERMINAL

UNIT

ETC-143

a

ba

a

ww

: :

~—

2

a

e

\

a

2

dee!

uJ

x

=

oO

ETC-143

PARTS

LIST

RESISTORS,

CAPACITORS

2410378003

2531027000

2551088003

OTHER

PARTS

2220560001

2048009003

2048007005

2040055000

2038058019

2038058006

2038059005

4450033005

2040046006

4140113002

MD-5271

+5%

+80,—20%

+10%

470

k

ohm

0.1uF

0.22uF

P.C.

OCARD

1P

JACK

1P

JACK

6P

CONNECTOR

5P

CONNECTOR

5P

CONNECTOR

5P

CONNECTOR

WIRE

CLAMP

BAND

5P

PIN

SOCKET

INPUT

BRACKET

P.C.B.

SUPOORT

asia

Ii

Part

Name

&

Descriptions

FOR

PHONO

FOR

REC1,2

FOR

TUNER

FOR

TAPE

R

FOR

TAPE

L

FIXED

CARBON

FILM

RESISTOR

FIXED

CERAMIC

CAPACITOR

FIXED

PLASTIC

FILM

CAPACITOR

,

TUNER,

AUX,

P.B.

,

AUX

FOR

OHONO

1,

2

USED

6

USED

6

PMA-830

-3

oO

CS

Tv

N

«

me

RPMA-830

CONTROL

(A)

UNIT

ETC-259B-1,

-2,

-3

(1)

TONE

UNIT

;

RIQ,20:2SA726(F)

TR25,26:2SA942(

BL)

TRI7,18,

21,22:

25C1000(GR)

aca

2nFRIG:20:2SA7261F)

TR2S,

(7)

95.022

.

Res

|

——1688.922

TR27,28:

25C2089

(BL)

i

$4ly

10/50

10/50

R758

()

6)

’

1

iNinw

:

(@

3

TREBLE

'

1

oO

'

¢

lo

as

'

*

1

x

f]

e

=

Je

2

4

cS)

J

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ee

}

2

s

2

~Te

ROG

=

Sis

2.2k

Vv

3

e

@b=

“C76

wo

16750

16790

CS

ada

“72

ETC-259B-2

43)

a

Mi

ETc-277

48)

|

+

+

R76

A)

48)

c6és

Cc70

47

: .

10/50

10/50

|

Ra

py

096

0.22

(ETC-259B-1)

CONTROL

(A)

UNIT

(2)

EQUALIZER

AMP

UNIT

CONTROL

(A)

UNIT

(

ETC-259B-2)

TRG

N0:2SA872(E)

«=

TRU,

12:2SCIT7S(E)

TRI3,14:2SC173510)

FT

nai

47x

TRIS,I6:2SAB50(0)

ssqay

@

°

TRI,2,5,6:

2scieaaiF)

533%,

R23

R227

20k

30x

47k

150

47/50

TR3,4

7,8:

2SAQqI(F

}

c3q

ces

4700p

Sj

~

pa

[7

c4l

ctr

a0

>>

|!

3

=a

Qn

Qe

;

sé

Ss

=

a

nee

*_}

|

ge}

les

@

Led

+

Raa

ve

oF

Ci6

0.0068

0.015

++

47

c40

47750

C94

I/CFQ3A

t

{

i

a

%

‘

T2

\

Soul

29

i

4

oO

|=

tz

to

Pate

Q—|t

5

3

wis

sou

-*

-.

|

2!)

(\a)

O

ee

T2

N