Realistic STA-115 - Page 35

SYMPTOM CAUSE AND REMEDY
19) LOUDNESS
has no
effect.
(1)
Defective LOUDNESS
switch:
Replace.
(2)
Defective C401, C403, 8403, R405
(Ll
or C4A2,C4O4,
R404,
R406
(R):
Replace
the
defective
part(s).
20)
MONO-Stereo
not
effective
(1
)
Defective
MONO-Stereo
switch :
Repair
or
replace.
21)
MUTING not
effective
('l
)
Defective SELECTOR
switch:
Repair
or
replace.
(2)
Defective transistor TR203, fR2O4,
TR205, TR206:
Replace the defective transistor(s).
(3)
Defective trimmer resistor
VR201 :
Replace.
(4)
Defective
diode D21 2:
Replace.
(5)
Defective
1C201
:
Replace.
22l' T
APE MONitor
does not operate.
(1
)
Defective TAPE
MONitor
switch:
Replace
or
repair.
23)
BASS has
no effect.
(1)
(21
VR404
(100k
ohm control) defective:
Replace.
Defective
C413,
415, 417, R419,
425
(Ll
or C414, 416,
418,
R420,426
(Rl:
Replace the defective
part(s).
24) TREBLE has
no
effect.
(1)
VR403
(100k
ohm control) defective:
Replace.
(2)
Defective
C411
,
R417
,421 ,427
(tl
or C412, R418,
422,428
(Rl:
Replace the defective
part(s).
25)
30 Hz
CUT
FILTER
has no
effect.
(1)
Defective 30 Hz CUT
FILTER
switch:
Replace the
switch.
(2)
Defective TR403,
404 capacitor(s),
resistor(s)
in
30 Hz
cut
Filter
circuit:
Replace the defective
parts.
26)
HIGH FILTER
has no effect.
(1)
Defective HIGH FILTER
switch:
Replace.
(2)
Defective
C425
(Ll
or C426
(R):
Replace
the defective capacitor(s).
271
AMIFM
SIGNAL METER not
functioning
(1)
Defective AM/FM
Signal Meter D801
-
805,
1C801:
Replace
the defective
part(s).
(2)
ln case
of
FM
reception, 1C201
,
D2O2,
D2O3,VR2O2
defective:
Replace
the
defective
part(s).
(3)
ln
case
of
AM reception,
1C203,
R255,R262defective:
Replace the defective
part(s).
28) TUNED
LED
not functioning
(1
)
Def ective D806:
Replace.
(2)
lmproper adjustment:
Readjust
T2O1, T2O2.
29)
Protector
circuit does not
work.
(1
)
Defective
SCR601
,
1C601, TR601
or TR602.
Replace the defective
part(s).
(2)
Defective resistor(s),
capacitor(s),
diode(s)
in
protector
circuit
Replace the defective component
(s).
-35-