Sansui AU-7700 Service Manual page 7

fl
r
L/
'
Symptom
4.
TUNER or AUX input
4-1.
Both channels inoperative
4-2.
One channel inoperative
*
SEt
MODE
SWitCh tO
REVERSE
5. PHONO
inoperative
5-1.
Both channels inoperative
5-2.
One channel inoperative
*
Set
MODE
switch
to
REVERSE
tl)
lnoperative
channel
reverses
*
Set
TONE
&
FILTER
switch
to
DEFEAT
2-1)
The inoperative channel
becomes
operating
2-2)
The inoperative channel is still
not
operating
Cause
& What
to
Do
a
lmperfect contact
of
speakers switch,
S7O2a,
c (S702b,
d)
Defective
Power Supply Section
Tuner connected
from this set
has
faulty
lmperfect contact
of
SELECTOR
switch,
S01c (S01d)
lmperfect contact
of
TAPE PLAY
switch,
S02a
(S02b)
.
Defective TR09
or
TR11
(TR10
or
TR12)
on
F-2095
.
lmperfect contact of LOW
FILTER
switch,
S04a,
c
(SOab, d)
.
Defective
TR01
(TR02) on
F-2096
Defective TR01, TR03, TR05
or
TR07
(TR02, TR04, TR06
or
TR0B)
on
F-2095
lmperfect contact
of
PRE-MAIN
switch,
S04a (S04b)
Defective Driver & Power Supply
Circuit
Board
Refer to4-1. of 4. Both
channels
inoperative
Turntable connected
from
th
is set
has
fau
lty
lmperfect contact
of
SELECTOR
switch,
S01a
(S01b)
Defective TR01, TR03, TR05
or
TR07
(TR02, TR04,
TRO6
or
TROB)
o
n
F-2092
Refer to4-2.
of
q. One
channel
inoperative
Check Point
inoperative
l-r)
lnoperative
channel reverse
I
I
I
L-21
lnoperative
channel
not
reverses
{;
Ë,
Y
1.
2)
Inoperative channel not
reverses
5.
6