Technics SH8025 SERVICE MANUAL

Page 1
oRDER
NO. SD83012372C1
Servlce
i_
Manual
Stereo Graphic
sH-9025
Area
*
[M]
*
[MC]
Eq
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
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
Page 2
LOCATION
I
OF
CONTROLS
Power
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
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
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.
Page 3
.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
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
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.
Page 4
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
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
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
Page 5
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.
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
Page 6
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 S
S
S
S
S
A
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
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
1.2K
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
2.7K
2.7K
2.7K
2.7K
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
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
Page 7
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
Page 8
--'---
:-(--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
Page 9
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
l6kHz
r13
Q
Page 10
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
o
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
E
2.5kHz
FILTERS
srfr
Tpl
112
R
o
E
E
L
E.
6.3kHz
,
SrP(
ETll
,l
sl
5-t
r
L
t6kHz
R114
E
E
(
OlOl
2SC
BANO
-l14
t8r5
PASS FI
Page 11
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.
position.
in "on';
the Lchannel.
with
rrrr>
Negative
(on
*
off)
chassis
the
voltage
values, depending on
(-B)
taken as
voltage
lines.
Page 12
ffi
EXPIODED VIEW
I
h
(NO
@
_-/
-d,
(-\
\-2-z
(R
\
'-Q
(<
'<l
tr
Page 13
,.p;
,rffi
@t
'd
E
Page 14
@
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
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,
Supply,
Source
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)
(1)
(14)
(3) (3) (1)
(4) (1) (1)
(1 (1
(1
(l
(1
(2)
l2t l2l lzt l2t
(1)
tzt
tzt
l2t
tzt
parts
order.
can
Bef. No.
ACCESSORTES
A1
12\
A2
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) (1)
(1) (I
)
o
Accessories
Printed in
Japan
830104400@
rM
,--1'
Loading...