Realistic STA-235B - FM Operation Troubleshooting; Stereo Separation and Volume Troubleshooting

5.
TROUBLESHOOTING
Refer
to
page
14
and 15 of STA-235
Service
Manual.
The
following
items
should be
changed.
Symptom
Cause and Remedy
13)
FM does not
operate. E) Delete
G)
Delete
H)
Defective lC
1C201
Replace
the
lC.
l) Defective IFT T101
orT2O1
Replace
the defective
components.
J)
Defective resistor
R2O1, R2O2, R203, R2O4,
R205,
R206, R208, R209, R213, R219
or R22O
Replace
the
defective
resistor(s).
K) Defective
capacitor
C203, C112 or C2O1
Replace the defective
capacitor(s).
L)
Defective
transistor TR101
,TR102,
TR103 0r
coil
L101
,
L1O2, L103, L104
of Tuner Board
oo42
Replace the defective
component(s).
14l, Poor
multiplex
separation. B) Transistor TR301, TR302
or
1C301
of Tuner
Board 0042 defective
Replace the defective
component(s).
15) Stereo indicator
does not
light.
C) Defective lC lC30'l
or resistor R321
Replace
the defective
component(s).
16) FM volume
not sufficient.
A)
lf
volume of both L and R
channels
not
enough:
Front-End
defective
or
faulty
lC
1C201, 1C301
or capacitor
C227, C301 of
Tuner Board 0042
Locate
and replace the defective
component(s).
B)
lf
sound of one
channel
not
enough: Defective
LPF301 or TR301 in
case
of L
channel, or
defective
LPF302
or TR302 in
case
of R
channel
Replace the defective
component(s).