Technics SH8025 SERVICE MANUAL

oRDER

NO. SD83012372C1

Servlce

i_

Manual

Stereo Graphic

sH-9025

Area

*

[M]

*

[MC]

Eq

[M],

is available

is

available

ualizer

[MC]

in U.S.A.

in Canada.

SpgCif

iCatiOnS

(Specifications

Weights and dimensions

are subject to change withour notice for

IHF'78

Frequency response

(centerposition)

Maximum

output

voltage :

Rated

voltage : 1 V

output

total harmonic

distortion

:5 Hz-100 kHz,

(1

V

kHz, THD

8

:0.005%

0.003%

(20

Hz-2O kHz)

(1

kHz)

dB

-1

0.01 %)

lnpuisensitivity :1V

Signal-to-noiseratio

Maximum input

voltage :8 V lnputimpedance Gain

CONTENTS

I

:100

:47kA

: 0+1 dB

dB (1

(110

kHz)

dB,

IHF'

LOCATIONOFCONTROLS....

OPERATION OF

TOTAL FREOUENCY

CONTROL SWITCHES

RESPONSE

SAFETYPRECAUT]ON

otsnsseMeuvtNsTRUcTtoNs....

RESISTORS.A,NDCAPACITORS..

shown

are approximate,

A)

Page

.,.,,,,2

, , . 2

.. . . . .. 3

.,.....3

.... 4

......5

further improvement.)

Band level

controls : +12 dB--12

(7

elements continuously

per

channel)

dB

Centerfrequency :63 Hz, 160 Hz, 4O0 Hz,1

GENERAL

Powersupply

Power

consumption

Dimensions

(HxWxD)

Weight

2.5 kHz,

120

:AC

: 8 W

:g5x430x200mm

(3-11/32"x16-1'li6"x7-Zt\")

:

2.3 kg

6.3

V,60 Hz

(5.1

lb)

kHz, i6

kHz

BLOCKDIAGRAM

CIRCUIT

BOARD

AND

WRINGCONNECTIONDIAGRAM SCHEMATICDIAGRAM EXPLODEDVIEW REPLACEMENTPARTSLIST.

variable

kHz,

page

....6

,,,7

....,..9

.,..12

,,..14

Matushita Engineering

ild Soryie

50 Meadowland

Secaucus.

Technics

I

New Jersey 07094

Company

Parkway

Pansonic 91'238 Kauhi

P.O.

Box

Honolulu, Hawaii 96808-0774

Pan6onic Division

Canada Limited

of 5770 Ambler Drive,

Ontario, L4W

Hawaii.

774

Canada

Mabushita

of

St.,

2T3

lnc.

Ewa Beach

Electric

Mississuga,

Pansonic Division of

Fueno

of

De I nfanteria, Klvl 9.7

Ave, 65

ndustrial

Victoria I

Puerto

Carolina.

Company

Sales

MaGushita Eleclric

Rico, lnc.

Park

Rico 00630

LOCATION

I

OF

CONTROLS

Power

indicator

switch

Left channel

(63H2

16kHz,

-

7 elements in

Band-level controls

2.5 octave)

divided

into

Equalization

(foff,^on)

-----T_---

LRight

channel

(63H2

-

7 elements in

16kHz,

outlet

AC

(EO)

Band-level

divided

2.5 octave)

(Unswitched)

Tape

(

controls

into

monitor

Isource,

Recording

(lstraigfrt,

*tape)

mode

^

EO)

Line input terminals

Line output

OPERATION

I

To listen

discs or radio

To

deck

To listen

tape

to

listen

to

to uncorrected

deck

corrected

terminals

OF CONTROL

sound of

sound

phono

from

a

sound from

tape

a

yback

terminals-1

out terminals ------J

SWITCHES

Corrections

Recordings without

possible.

Recordings without

source sound are

Recordinp of the

and recordings

can be made

source

sound.

FTaPe

corrections

possible.

can

made.

be

are also

of the

with corrections

EO

$/uitch

u

on"

(I+^)

tape monitor

switch

"source"

(-+I)

"lape"

(f +^;

rec

mode

switch

"EO"

(l+^)

"straight"

{^+Il

"straight''

(^+I)

"EA"

(l+^)

Press

the equalization

switch

(EOl

in

to the

"oft"

l-+l

position

)

to listen

to uncorrected

sound, or

when

recording.

.lf

the amplifier

has

recording mode selector and

a

input selector:

an

ooouu00Eo

(Make

setting

as shown in the figure.)

TOTAL FREQUENCY

I

SAFETY

I

1. Before

2. Use

3. After

4. Before

o

1. Unplug

2. Turn

3.

only

damage is

servicing,

(1

tfre lead dress

)

(2)

insulation

from

being exposed

lnsulataon

on the

Measure

the

apparatus, such

The readlng

possibility

is a

PRECAUTION

servicing

(such

manufacturer's

evident.

be sure to restore

and

barriers, insulation

returning

the

a serviced apparatus to

to a shock hazard.

resistanoe

power

supply cord and connect

power

switch of the apparatus.

resistance

as screwheads, antenna,

should be as shown

of a

shock

as

value

RESPONSE

replacement

recommended

(See

test

(with

hazard, and the apparatus

of components), unplug

components

following

the

papers,

shields and the like.

a customer, make

figure below.)

jumper

a

an ohmmeter)

control

in figure

the

for

safety. Check condition

to the condition in

the

wire

between the two

between the

shafts,

jumpered

handle

below. ln case a

should be

repaired

+12

+10

+8 +6 +4

^+2

d)

E0

2

o

J-6

-8

-10

12

power

supply cord to

which they

following

brackets, etc.

measurement

insulation

prongs

AC

and rechecked

Frequency response

Frequency

prevent

power

of

were originally

resistance

on

the

plug

and each exposed

is

outside of

cord and replace

installed.

;

plug.

the limits

before it is returned

(+

12 dB

(Hz)

an electric

prevent

test to

metalic

position)

shock.

if wear

customer

a

cabinet

specified,

to

customer.

a

part

there

or

on

a

Antenna

terminal

Exposed

metal

part

Tuner, Receiver

3Ma<R<5.2Ma

etc.

where,

Exposed

metal

part

R: resistance

value

Turntable,

R

nearly

=

Amplifier

@

etc.

DISASSEMBLY

I

How

to remove the

panel

1. Remove

cabinet,

the 2 screws

and 3 screws on

1'G)l

2. Remove

3. Remove

chassis

4, Remove

the

5. Remove

of the arrow

(The

board with

(A))

and

power

front

the cabinet.

the 2

the

switch.

the

INSTRUCTIONS

cabinet

on

which

screws

panel.

front

the

setscrews

front

IFig.

panel

the connector

panel

1

1.

fitted

is

IFiS.

front

and

side of

the

the back.

connect

IFig.

2:

IFig.

1:

@1

the

@]

in the direction

to the circuit

Fig.

as in

@ro-

of

ponel

Froni

g

6.

Fig.

o

1

How

1. Remove

2. Remove

How

P.C.B.

1.

2. Release

remove

to

cabinet

the

5 screws

the

the chassis.

to remove the band

Remove

from

the

the chassis.

the claw

the LED circuit

panel.

3. Remove

remove

panel.

4. Pull

as

in Fig.

5. Bend

as

in

from

3]

IFig.

the 8 screws

P.C.B.

the

out the 14 band level

4.

the 12 claws

Fig.

5,

P.C.B. holder.

the

P.C.B.

main

and front

[Fig.

2:

pass

panel.

@]

cabinet and front

part

at

board

holder from

$

from

[Fig.

and remove

the

3:

@]

the

control knobs

shown by

then separate

arrows

the

tro,

filter

panel

front

anO

front

(-+)

P.C.

B.

P.C.B.

Holder

Bond Poss

Froni Ponel

Filter

P.C.B.

Fig. 3

LED P.C.B.

Fis.

4

Bond Poss Filter

P.C.B

Precautions

I

The band

To install

I

connector is completely f

Front

pass

the

ponel

panel

for

filter P.C.B.

panel,

front

installation

is fitted

itted as

insert

to the

the

in

Fig.

main

part

(B).

6

O

P.C.B.

with

into

the chassis as shown by

connector

the

Fig.

as in

6

the arrow so that

(A).

the

Bond Poss

Filter P.C.B.

(B)

Fis.6

Moin P.C.B.

(A)

Fig.6

^

RESISTORS

I

Notar 1.

Part

Please

lmportant

2.

Components identified

important for

use only manufacturer's

Numbering System

Example

ERD

_

ype

I

{Carbonl

25

Wattage

(1/4W)

sl

numbers

use this

safety notice:

AND

indicated

are

part

number

safety. When replacing

Resistor

of

F

Shape

CAPACITORS

most

on

parts

for

by

mark

A

specified

J l0l

Tolerance

(1000)

mechanical

orders.

have

any of these components

parts.

special characteristics

Numbering

Example

ECKD

Tr*

Value

ECEA

ECCD

ECKD

ECF

Syntem

IH

V"t,.S.

Capacitor Type

: : : :

of Capacitor

102

Value

Tolerance Pec{liarity Type Voltage Peoliarity use

Electrolytic @ramic

Ceramic

Semi conductor

production

4.

The unit

5.

The unit of capacitance

parts.

of resistance

ECEA

Type

:

1A

:

iC

:

lE

"

mark

S

The

lV : lH : 50 :

25

:

is

service standard

is O

pF

is

Voltage

Oth6rs

lH

10V'

16V

KC

25V

ECFTD:

35V 50V

50V

25V

parts

(otrm).

(microfarad).

:50VDC

:

400VAC 25V DC

K

=

may

and

1OooS,,

P

=

Tolerance

K:

* 10%

+80%,

Z:

+lAWo.

P:

differ

M

10-6

-20%

f

rom

loook0.

=

pF.

Value

-ff/o

Bef. No. Part

RESISTORS

R1,2 S R3,4 S R5,6

R11,12 S

813,14

R21,22 S R23,24 S

R25,26 S R27,28 S R29,30 R31,32 S R33,34 R35,36 R37,38 R39,40 R51 R52 S

R53 S R54 R55 856

R57,58

R61 862

R71,72

873,74

SA

Sa

S

S S

S S S

S

A

ERO251J224

EBD25TJ333 ERD25TJ824

ERD25TJ224

ERD25TJ104

EBD25FJI02 ERD25TJI54

ERD25TJ104 EBD25FJ472

ERD25TJl04

ERD25FJ822 ERO25FJA22

EROzsFJ222 ERD25TJl04

ERD25FJ181

eRoz5FJ222

ERO?5FJ472

ERD25TJ273

ERD25TJI23

ERD25FJ562 ERD25FJ103

ERD25FJl02

ERDSl FJ821 ERDSl FJ681 ERD25FJ471 ERD25FJ33O

No. Value

220K 33K 820K 220K

r00K

1K 150K

100K

4.7K 't00K

8.2K

2.2K

100K 180

2.2K

4.7K

27K

12K

5.6K

10K

1K 820 680

470

33

Ref. No.

R101,102

R103,

r04 S

R105,106 R107,108 R109,110 S

R'trl,112

R113,114 R201,202 R203,2(N S R205,206

R207,208 R209,210 R211,212 8213,214 R301,303

R3m,304

8305,306 R307,308 R309,310 R311,312

R313,314 S 8401,402 S R403,404 S R405,406 S R407,408 R409,410

R41

1,412

R4r3,414

Part

S

ERD25FJ821 ERD25FJ122

S

ERD?EFJ122

S

ERD25FJ152 ERO25FJ122 ERD25FJ152

s

ERD25FJl

S

ERD25FJ821

s

ERD25TJ124

s

ERD25TJ124

ERD2sTJ823

s

ERD25TJ683

s

ERD25TJ563

S

ERD2sTJ563

S

ERD25FJ181

S

EBD25FJ391

S

ERD25FJ391

S S

ERD25FJ1

S

ERD25FJ391

S

ERD25FJl

ERO25FJ221 ERD25FJl 22

ERD?5FJ2I2 ERD25FJ272

S

ERD2BFJ272

S

ERD?5FJ272

S

eRo25FJ272

S

ERD?5FJ272

No.

Value

820

1.2K

1.5K

1.2K

1.5K

52

1.5K

820

120K 120K

82K 68K 56K 56K

180 390 390

21

120 390

51

150

220

1.2K

2.7K

Ref. No. Part No. Value

CAPACITORS c5

cll, 12

cl3, 14

c15, 16 c17, 1A

cI9,20

c21,22 c23,24

c31

c32

c33 c34 c35

c41,42

cr''3,44

c45,46 c/.7,48

cl01,102 cl03,104

cl05,106 cl07,108 cl09,

cl11

,112

cl 13, 1 14

c201,202

c203.2U

1

10

A

s

s s

s

s s

s

ECEAlASIOl

ECEA25Z4R7

ECCD1

H101 K

ECCDl

H101 K

ECCD1 H101 K

ECEA25Z4R7 ECEAI ES220 ECEAl E522O

ECEA50Zl ECEAlASIOl

ECEAl ESlOl ECEAI

HSlOO

ECEAlV5330

ECKD1H223ZF ECEATVS4TI

ECEA1CS331

ECEAl

CS102

ECEA50Zl

ECEA5OZR33 ECEAsOZRl ECFTD6S3JX

ECFTD2T3JX ECFTDl03JX ECFTD392JX

ECEAl

HSlOO

ECFTD223JX

5

100

4.7

100P 100P 100P

4.7 22 22

1

100

l0

33

0.022 470

330 1000

1

0.33

0.15

0.068

o.o27

0.01

0.0039

l0

o.o22

Hef. No. Part

c205,206 c207,208

c209,210 c211,212 c213,214

c1001

s s

A

No Value

ECFTDS22JX

ECFTD332JX ECFTD222JX

ECKDl

H821 KB

ECKDl

H331 KB

ECKDKCl03PF2

0.0082

0.0033

o.oo22 820P 330P

0.0r

BLOCK

I

DIAGRAM

tPrarfi--l

r----

MUTING CIRCUIT

TAPE

s2-r)l

MONITOR

I

)

(s3-3)

ot

ori

tct

BUFFER

svrTA755595

BUFFER A OP

(2.5

Oclovc

OlOl

-

OIOI

lt/21

rcr

tct oP

-Oll3

u/2)

aMP.

filter)

AMP.

Oll3

Dro

(POWER

,

IND.)

POWER

(s4

)

AC LINE

CIRCUIT BOARD

I

AND

WIRING

CONNECTION

DIAGRAM

o

Terminal

SVITA75559S

MA1 1 5OH

-{D-

ffi

guide

52076A

SVDl

MA1624

(Earth)

Ground

of transistors,

2SA1015,2SC1815,

2SC2878

--o>-

line

lG

and diodes

258941,25D1265

SVDIB4B42

MA27W_A

-ilr

--*{-

Poyi,er

indiuttn

left$

54

Pou,,er

sullch

l.

L

t3lz

B

Ll,,

:?*

!€

lt

'l I

--'---

:-(--1 I

'---f-

AC

(LaHz)

L]NE

t2av

r1

Pnlrler transior,ner

ENE

ill@@

ortlDL-MBAcK]

rkEC

?n

t"?

t-l

lo

!.

l^

tr-;*l,l,r-

-[

.,r'.lg

u

2.5kqz 6.3kHz

t6KHz

I

SCXEMATIC

I

DIAGRAM

(This

schematic diagram

may

be

modified

at any time with

4

the

development

of new technology

signal

Output

(Corrected

LINE IN

LI NE

signal)

REC OUT

PLAY

OUT

BACK

r:

EE

tc

S!

BU

signal

lnput

R1 220K

M0DE)

on

l(RED

ll(nrc ir,roorl

I

strairhl-

Eo

LSJ-1_-

:

s3- 1

T

L

I

s3-3

_sr:1_rstrairht-Ee

r(E0)

I,oft-

_st- ! _ _j

-

Ea-:

R

rT-

r11-1

s3-4

)oy1*

on

o

Ol

or

99

t

63Hz

o d

o

d

63Hz

0rol

Rrol

l60Hz

0103

l.2K

4OOHz

Rt05 l.2K

0r05

\

E

N

o E

l60Hz 4OOHz lkHz

LEFT CHANNEL BAND

kHz

I

0

107

2.5 kHz

PASS

2.5 kHz

0 109

q

\

o

Y

(

o

E

FILTERS

kHz

6.3

0111

6.3kHz

!

E

l6kHz

r13

Q

rlopment

of new technology.)

5l6t7r8r9r10

rE)

ODE)

..E0

EA

R2r 1K

tc I SVITA75559S

BUFFER(LCH)

+ycc

]E

?5V+.1

c11

Kroop I

C

o

g:

--rH

47K I

5

;J

;LI

R3t

8.2K

JC17

c19 ?5V

oon

{ir

Rl3

8.2K

'.....'#

> ol

p

E

o

4.7

2sc2878

MUTE

SWITCHING

@

c12

-l-l

L

tC?

svrTA7s559S

BUFFER

I

v

(R

CH)

-vcc

@

Ii_

R32

IC2

xi

()

I

eS

zsDt265

REGULATOR

06

2SB94

REGULATOR

t

r-:r

147

05

EQ

c+s

* l--

+ycc

@

I-

J

c?0

cl8

R14

E

---l

-t

L46

r-

+l

T-l

@6

@;

#

I

E

02

+

o

t

o4

2SAIO

MUTE SU

D3,9

MA I62

0

ti

kHz l6kHz

i.3

oilt

)sE.+(

la

tesl

R113 5K

\

o

<i

Ee

tr

EO

>3

Hz l6kHz

0113

)

E

F

i

/\

I

il

hi

:l

i

63Hz

_.1

{l

0r0?

l60Hz

0104

4OOHz

0 t0d

I kHz

08

0l

2.5kHz

o 1to

6.3k

01r?

Hz

l6

kHz

0114

t

q(

c?02

EI

o

l'i

N

E

L

(r

63Hz

)

sr#(

E

Tsl

R 104

9

o

E

lu

L

d

l6OHz

9r

:+

t

€

E

L

4OOHz

RIGHT

)

srF(

@

Rl06

O

c

t

a

E.

CHANNEL

T#l

R 108

a

L

E

lkHz

BAND

x

)

EA

o

E

PASS

sr5(

tlt

L

)

E

110

R

E

2.5kHz

FILTERS

srfr

Tpl

112

R

o

E

L

E.

6.3kHz

,

SrP(

ETll

,l

sl

5-t

r

L

t6kHz

R114

E

(

OlOl

2SC

BANO

-l14

t8r5

PASS FI

B94 I

; ULATOR

t6v

c45

130

D

MA

I5V

7,8

I

t50

ZENER

DI

SVDIB4B42

RECT

C46

l6kHz

114

0

GROUND

lz"

tt

Power

ON

POINT

Mulino oN rifie

-l

AC 12OV

60Hz

T1

I

i

Power

OFF

@

ET

Ril4

OlOl

2SCt8r5

BAND PASS FILTER

l,

Hz

6k

___l

-l14

Dto

LN224RPH

POWER

IND

Notes:

'1"

51-1 - S1-6 :

2. S2-1

-

3. S3-1

-

4. S4

The B

5.

For

the resistanceand capacity of R

by the standard. Therefore, there may exist

the

internal impedance of the

,,,,r,,,,,r,,r,',is,ii,

7.

8.

Recording

S2-2 :

Tape

(

:.Equalization

S3-4

: Power

channels use

and L

DC

electronic circuit

Signal Positive

mode switch

(straight

source

*

monitor

switch in

tape

-

(EO)

switch

in

the same circuit.

tester

lines of left channel.

(+B)

voltage

-

EO)

in

,,source,,

)

switch

position.

"on"

channel, refer to

(high-impedsnce)

some errors in the

DC

circuit tester.

lines.

"straight,,position.

position.

in "on';

the Lchannel.

with

rrrr>

Negative

(on

*

off)

chassis

the

voltage

values, depending on

(-B)

taken as

voltage

lines.

ffi

EXPIODED VIEW

I

h

(NO

@

_-/

-d,

(-\

\-2-z

(R

\

'-Q

(<

'<l

tr

,.p;

,rffi

@t

'd

E

@

I

REPLAcEMENT

f

Notes:

1. Part

numbers

2. Important

when replacing

_

3.

Eracketed

4.

"S"

The

5.

The

Ref.

No.

INTEGRATED

tcl

,2

TRANSISTORS

01,2

03

Q4

05 a6 4101-114

DIODES

Dl D3s

D4,5

D6

D7,8

D9s

D10

mark

parenthesized

CIRCUITS

SVITA75559S

2SC2878A-T

2SC181

2SA1015-Y

25D

25894

2SC181

svor 84842

A

MA162A SVDl52076A

MA27W-A

MAl I5OH

MAl62A

LN224RPH

TRANSFORMERS

T1

tMI

rl

[Mc]

SWITCHES

sl,2.3

s4

VARIABLE

VRl-14

SLTK5J 14-Z

A

SLTKSJlT-Z

A

SSH

ssH1071

A

RESISTORS

EVADO3ClOG25

are

sa{ety

any

indications

is service

Part

No.

5L-G

1 265-0

1

-P

5L-G

K3 1

PARTs

indicated

notice:

Components

of these

in Bef.

standard

numbers

Description

Operation/Buffer Amplifier

Mute Mute Mute Regulator Regulator Band

Rectifier Rectifier,

Power Muting

Switching, Mutinl

1$V Zener

Porer

LED

Light Emitting

Diode

Power

E8,

Tape

Monitor,

Mode

Puer

Frequency

Control, 200ko(G)

on most

components,

No.

columns

parts

in

the

column of

Switching Switching Switching

Pass

Filter

Muting

Supply,

Source

Bec

Soure

Level

Ltsr

mechanical

identif

and

CABINET

2

3 4

5

6

7

?-1

8

eas

10

11

12

13 13

14 15

scREws

NI

N2s N3s

N4S N5S

N6

N7s N8s N9s

WASHER

N15

parts.

ied by

use only m-anufacturer's

specify

the area.

may differ {rom

description

Ref. No.

and CHASSIS

1

tMl

tMcla

SGWKHSO25E

SGXK68

sBc337-1

SBD79

SUBKl 1

sBc433-1

SGPKHSO25M

SKLKl

sJF3055-1

RHRl 1 1 sKc1370S

SJS59O1

sJS9221

a

SJS9223

SJT391 1

SH B301

XTS3+8BFZ

S

XTB3+8BFN XTB3+8BFN

XT83+8BFN

XTB3+8BFN

sNE2095-2

XTB3+8BFZ XT83+lOBFZ XT83T6BFN

XWG3 Plain

S

Please

use this

have

mark

2\

Parts

productlon

stand for

Part

No. Description

RJA9Y

N

-1

part

special

specified

without

quantity

the

PARTS

Panel Front Holder

Button, Button

Connection

Button

Panel,

Rear

(dFeet)

Foot

Terminal Board

AC Cord, Power

Sou rce

Bushing

Cabinet

Connector

Socket Socket Connector

Clamper,

Tapping, Tapping, Tapping, Tapping, Tapping, Tapping, Tapping, Tapping, Tapping,

@3 12

indications

per

set.

& Pcs

(1)

(14)

(3) (3) (1)

(4) (1) (1)

(1 (1

(1

(l

(1

(2)

l2t l2l lzt l2t

(1)

tzt

l2t

tzt

parts

order.

can

Bef. No.

ACCESSORTES

A1

12\

A2

PACKING PARTS

Pl

P1

P2 P3

P4

) )

)

l

)

number for

characteristics important

parts.

these

parts.

Ass'y

Power

Rod

Ass'y

Lead Wire

3xB

@

3x8

@

3x8

@

3x8

@

3x8

@

Cabinet

3x8

@

3x10

@

3x6

@

[M1

tMCl

IM]

tMcl

for

be used

sJP2129-5

SQFKlOO29

soFK10030

SPG K,I 07 SPG

SPSK54 SPSK55 SPP7l

safety.

for

Areas

* *

Part No.

K1 06

9

all areas.

is available

[M]

is

available

[MC]

Cord, Connection

lnstruction lnstruction Book

Carton Carton Box

Pad Pad

Polyethylene Sheet

in

U.S.A.

in Canada.

Description

& Pcs

Book

Box

(Leftl (1) (Right)

\l

I

i

I

l2l

(1) (1)

(1) (I

)

o

Accessories

Printed in

Japan

830104400@

rM

,--1'