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Technics SH-8028 Service Manual page 7

Stereo graphic equalizer

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1
2
3
4
5
6
RS
SCH
EMATIC
DIAG
RAM
(This schematic diagram may be modified at any time with the development of new technology)
Note 1:
;
1. $1:
Recording mode selector in "EQ"
3. $3:
Equalization switch in ''on"' position.
5. $5:
Voltage selector in
''220 ~ 240V"'
position
position. ( =; EQ, M Straight)
(.- :;on, @
;off)
(For [XA], [PA] and [PE] areas)
n
2. $2:
Input selector in ''source" position.
4. $4:
Power switch in ''on"' position.
(= ;tape, M
; source)
(= >on, @
;off)
(ciot
PP, Se
ee
eT
eR
er ne ee
AN6555
BUFFER AMP
CG)
Input signal
(source signal)
B
(L
ch)
(RISO)
LINE
IN
QO
PROCS
CELE
1K
wot
QI01, 102
LINE OUT
(Cytron
2SC2878A
MUTING
Output signal
iS
eee
(corrected
-
TAPE
signal)
; -
ee
PLAY BACK
C
(R ch)
|
(R120)
LINE
IN
LINE OUT
D
oe
OUT
TAPE
S2
(R122)
CINPUT
SELECTOR)
PLAYBACK
©-—
ol
+
fi
S&T
gs
Recording signal
Food
| oo
ve
rE
0
to
|o
jo
|o"
fo
Bi
Teclaxl i]
(15)—(14)-—=(13)-—(12)- —{" !)
a
ae
9
=)
1C 201,202
:
#
M5229P
BPF
:
47K
S|
;
( REC MODE)
ze:
eR Rt
ie
ie
i
ce
$60
O)—(2)
=)
(4) (5) (5) 7)
(8) (9-19)
3
12
O
Oo A
re)
On 0
ie)
(e) M4 ce)
0_@
}0
0
g8-
| 832
jaet
[58+
| 88
SWITCH/JACK CIRCUIT
st
bbecy:\sey
ise
lesr
ee
wo
Note 2:
"
n
ou
<
a
x
+
0%
a
="
1. All voltage values shown
in circuitry are the
*(
_) Indicates resistors and
7
os
=o
sour
uo
Ke)
.
:
.
K
V9
vo
o
Yo
standard values for the DC electronic circuit
capacitors are use product
:
#
"
F
tester (high-impedance) with the ground point
for [EGA] area.
taken as standard. Therefore, there may exist
some errors in the voltage values, depending on
the internal impedance of the DC circuit tester.
COO
2.—{(_}-
Positi
:
;
>
ositive and Negative voltage supply line.
0101
6.3kHz
160Hz
16kHz
C206
=
O28)
c204
16V220
+
cs
Ci0
0.022
lade
49
be
C2!
I6OHz
C3
25v220
MA
165
C4 25v220
Signal line (Left channel)
D103
D105
D107
D109
Dit
DUS
oe
cen
Ole
D104
0106
ie
Aare
fn
AD
fri)
fey
fa)
VAD
SAD
Wi)
ey
ay
ay,
oJ,
ay,
ay,
WY
Nay,
Say,
400Hz
c2's8
6)
C22
C220
D110
Sa
LY
2.5kH
-~0-0-O-O-
6-5)
9) -O)-)-)
9
c252
@
>
LN260RCPP
x J4
z
SH-8028
'
-
off
«<«—+
on
<i
=
$4
Y.
( POWER)
Oo
QI
2SC!I815
is
MUTING CIRCUIT
"
(SWITCH ON)
N
mm
ax
Q2
i
x
2SA 1015
tat
<
MUTING CIRCUIT
Ye
m
(SWITCH ON)
a
XL
See
(E, EH, EB,
EF,EK
,EGA, Ei,
wd
A
AC220V
50/60Hz
(E] [EH] [EB]
[EF] [EGA] [Ei] 4
AC240V
50/60Hz
[EK} [Xt]
(XA, PA,PE)
SSA
=
'
(VOLTAGE
a
At!
SELECTOR)
I=
te
Se
wy
UO
6)
TY) Ho
127
a
CO
>
on
2
|
|
a>
|
|
|
|
5
OO)
1
|
|
|
|
ACHIO™
127
4
1
/220™%
240V
DIt2
DI14
[ee os Dy
50/60H2
S449}
6.3kHz
"16 kHz
ate | ee

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