SYMPTOM
CAUSE
AND
REMEDY
7l
One
channel does
not work with
VOLUME at maximum, with a test
signal applied to the center terminal
of
Volume
Control
VR902
of
the
dead
channel.
Defect in transistor
TR901, TR902
or
TR903 of
Tone Amp Board
9035
Locate
and correct the
defect.
Defect in transistor TR601, TR602,
TR603,
TR6O4, TR6O5, TR6O6, TR6O7, TR6O8,
TR609, TR610, TR611
or
TR612 of MAIN
AMP Board
6052
Locate and correct the
defect.
Short
in
speaker output
terminal
Repair the short.
Defective resistor R902, R903, R905, R906,
R907, R908, R909, R917, R921,or R922of
TONE AMP Board 9035
Replace the defective resistor(s).
Defective resistor R602, R603, R604, R605,
R606, R607, R608,
R609, R610, R613 0r
R615 of Main Amp Board
6052
Replace the defective resistor(s).
A)
B)
c)
D)
E)
8)
Same as 7 above but channel
operates
when
test
signal
is
applied
as 7.
A) Defective lC
(1C501
NJM 4558D-D)
Replace the lC.
B)
Faulty resistor R502,
R503, R504, R510 or
R511 of
Pre-Amp
Board
5042
Replace the faulty resistor(s).
C)
Faulty
capacitor C501
or C506
Replace the
faulty
capacitor(s).
D) Defective
SELECTOR switch SW1
Repair or replace the switch.
9) Speaker works
normally
but
headphones do not work.
A)
Headphone
plug
does
not
mate
with
jack
Replace the
plug.
B) Defective resistor R651
Replace
the resistor.
10) All the inputs
work
normally except
AUX input.
A)
Poor
contact
in AUX input
jack
Repair or replace the
jack.
B)
Poor
contact in SELECTOR switch SW1
Repair or replace
the switch.
1
1)
PHONO
input
not
operative.
Poor
contact
in
PHONO
input
jack
Repair or replace the
jack.
Faulty
SELECTOR switch SW1
Repair or replace the switch.
A)
B)
121
TAPE MONITOR 1(or2)
OUTnot
operative.
A) Defective contact in TAPE MONITOR 1
(or
2l
OUT
jack
Repair or replace the
jack.
B) Defective
contact
in TAPE MONITOR
switch SW3
Repair or replace the switch.
13) FM does not operate.
A) Transistor TR801 or TRB02
damaged
Replace
the
damaged transistor(s).
13
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