Realistic STA-720 - Page 15

SYMPTOM
CAUSE AND REMEDY
17
.
LOUDN ESS has no
effect.
A) Defective
LOUDNESS
switch 59
Replace the switch.
B) Defective capacitor
C91 1, C912
or
resistor
R91 1
Replace the defective component(s).
C)
Defective
VOLUME control
VR902
Replace.
18. Stereo-Mono
not
effective
A) Defective
MONO
switch 58
Replace
the
switch.
19. TAPE
MONitor not effective
A) Defective
TAPE
MON
switch
57
Replace
the switch.
B)
Poor
contact
in TAPE
MON
lN
jacks
Repair or replace the
jack(s).
20.
BASS
control
has
no
effect.
A)
B)
BASS
control
VR903
defective
Replace.
Defective capacitor
C903, C904
or
resistor
R915,
R917
Replace
the
defective component(s).
21.
TREBLE
control
has no
effect.
A) TREBLE
control
VR904
defective
Replace.
B)
Defective
capacitor
C905-C907 or resistor
R918,
R919
Replace the defective component(s).
22.
Excessive
noise with
PHONO input A)
Faulty 1C501
Replace the
lC.
B) Faulty
R501-R504, C501 or C506
Replace the faulty component(s).
23.
Noisy
VOLUME
control
A) Defective
VOLUME
control
VR902
Replace the
variable
resitor.
B) Defective capacitor
C503, C901,
C908 or C601
R
ep
lace the defective capacitor(
s).
24.
SIGNAL STRENGTH
indicator
LED
not
functioning
A) Defective
LED D401-D405 or
lC4O2
Replace the defective component(s).
B)
ln
case
of
FM
reception,
VR201
or
D2O2
defective
Replace the
defective component(s).
C) ln
case
of
AM
reception,
1C401
or
R416
defective
Replace
the defective component(s).
25.
AUTO-Magic
AFC has no
effect
when
AUTO-M
switch is ON.
A) Defective
D 101,
R
1
18, R22O or C213
Replace the defective
component(s).
15