Sansui AU-7700 - TUNER AND AUX INPUT TROUBLESHOOTING; Both Channels Inoperative (Tuner;AUX); One Channel Inoperative (Tuner;AUX); PHONO INPUT TROUBLESHOOTING

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