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Technics SU-7700 Service Manual

Technics SU-7700
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Schematic
Diagram......
Model
SU-7700
|
1
2
|
3
—_—e_—
——_—_e———_——E———
VE
ee
ee
ee
ee
ee
rc
cr
rrr
cr
cm
cr
re
cree
we
rr re
cee
ct
cm
ce
ce
cm
cc
rrr
cm
re
cm
ce
es
ee
ee
ee
ee
ee
ee
|
eee
SS eS
SS
[sup
d
|
SUP
10392A
TR201.202
TR219,220
TR205,206
TR209,210
TR211,212
!
[-
]
;
11030
|
2SA798A
25C1328
©
2SC1885
«=
2SC1567
=
2SA794
|
|
A
:
|
|
DIFFERENTIAL
EMITTER
PRE
DRIVE
DRIVE
DRIVE
7
|
|
|
(LOUDNESS)
|
|
C
{LOUDNESS
TR203,204,217.218
Coe
f
25C828°
x
l
Dee
CURRENT
MIRROR
2
es!)
we
4
(@s2)
PHONO
|_|
G22)
—_{'*)
33
.
ae
main
©
|
6
Sr
R
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(113)
x
85
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7
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2.2K
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5
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ul
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e
=
J
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g
or
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(C
oe
i
TUNER
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TO
16
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3
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|
D101
|
SVDMZ422
ze
es
|
ZENER
Ri3i
A
|
R2i2
Raia
Ll
28
N77
coe
$4
PLAY
|
|
ae
OC228
TAPE
|
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8
reci
|
Se
|
aaa
REMOTE
é
|
BS8
Rist.
4.7K
a
|
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|
ie
a
ais
2w
680
‘©
R28
¢
C
PLAY
2|
aa
SVDMZ314
lg
TAPE
2
|
(TAPE
MONITOR)
(REC
MODE)
ZENER
\
REC
2
|
he
oe
ai
uA
i
|
2
l
TAPE
2
TAPE
2
i
7
3
3
ONO
ry
:
3
3
3.
:
5?
lerkcen
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|
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l
2 2
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loa||
eo"
i
|
:
|
oo
aaa
ES
Tape!
|
ee
1
ora
|
2
REC
|
|
(HI-
FILTER)
é
Se
=
(iy
1
R
|
ONi3.
3
1°3
&
se
PLAY
2
|
8
TAPE
2
|
D
REC
2
|
TR303,304
2SA564A
D401~
404
TR301,302
RVDSR3AM-2N
0301
2SA564
RECT
MA150
ae
LT
RELAY
DRIVE
Notes:
1.
S1~S3_:
Input
selector
switch
in
‘-PHONO"”
push
position.
S1...(PHONO)
S2...(TUNER)
S3...(AUX)
2.
S4:
Equalizer
subsonic
filter
switch
in
‘'ON”’
position.
3.
$5:
Tape
monitor
switch
in
“SOURCE”
position.
E
TAPE
|
(2)
(TAPE
1)
++)
(SOURCE)
«+
@
(TAPE
2)
4.
$6:
Recording
mode
switch
in
“SOURCE”
position.
REC/
PLAY
(2)
(TAPE
1
®
2)«—+@)
(SOURCE)++@
(TAPE
2
&
1)
5.
S7:
Mode
switch
in
“STEREO”
position.
6.
S8:
High
filter
switch
in
‘‘OFF”
position
7.
SQ:
Loudness
switch
in
‘‘OFF”
position.
8.
S10:
Main
speakers
switch
in
‘‘'ON”
position.
[6]
SU-7700
SU-7700
10.
11.
12.
io:
14.
S11:
Remote
speakers
switch
in
‘‘ON”
position.
S12:
Meter
range
selector
switch
in
‘‘X1"'
position
(X
1«—»
X0.1)
S13:
Power
switch
in
‘‘OFF’’
position.
$14-1,$14-2:
Voltage
selector
switch
in
‘‘110V”
position.
@
(110V)
++
@)
(120V)
«++
G)
(220V)
++
@
(240V)
[J
Indicated
voltage
values
are
the
standard
values
for
the
unit
measured
by
the
DC
electronic
circuit
tester
(high
impedance)
with
the
chassis
taken
as
standard.
Therefore,
there
may
exist
some
errors
in
the
voltage
values,
depending
on
the
internal
impedance
of
the
DC
circuit
tester.
This
schematic
diagram
may
be
modified
at
any
time
with
the
develo-
pment
of
new
technology.
LEFT
CHANNEL
RIGHT
CHANNEL
SUP9850B
@
SCHEMATI
e
only
set
for
[XGF],
[x
AC
LINE
110/120/220/240V
r—
m
TR.
&
1.C.
TE
SU-7700

Table of Contents

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Technics SU-7700 Specifications

General IconGeneral
Damping factor30
Input sensitivity2.5mV (MM), 150mV (line)
Output150mV (line)
Speaker load impedance4Ω to 16Ω
Power output50 W per channel into 8Ω (stereo)
Signal to noise ratio95dB (line)
Channel separation55dB (MM)

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