Realistic STA-7 - Value Selected Parts; FM Stereo Indicator Sensitivity Adjustment

Symptom Cause/Remedy
15)
FM
stereo does
not work.
1) Defective lC
(LA3350)
(1Cl01)
*
R
eplace.
2) Defective VR102
or 103
*
Replace.
3)
Defective
transistor, diode,
resistor
or capacitor
of
FM
MPX
circu it
*Replace
the defective
part(s).
4) Defective
Pilot
lamp
PL701
*
Replace.
16)
"LOUDNESS"
has
no
effect. 1) Defective
"LOUDNESS"
switch
*Replace
the
switch.
2) Defective C301-304,
R301-302
*Replace
the defective
part(s).
l7)
"BASS"
has no effect.
1)
VR304
(100
K ohm controlldefective
*Replace
it.
2) Defective
R315-322
or C315-318
of
Tone
Control board
*
Replace
the
defective
part(s).
18)
"TREBLE"
has
no
effect.
1)
Faulty VR303
(100
K ohm control)
*Replace
it.
2) Defective C311-314
of Tone Control
board
*Replace
the
defective
part(s).
l9)
"TAPE
lN" inoperative
1)
Poor
contact in
"TAPE
lN" input
jack
*Repair
or replace it.
2)
Faulty "TAPE
MONitor"
switch
*Repair
or
replace
the
faulty
switch.
8.
VALUE SELECTED
PARTS
The value of some
parts
is
selected
at the
factory for optimum operation.
lf
the circuitry does
not
operate
properly, you
can change these
values.
R167
-
This
is to
control
FM
Stereo lndicator
Sensitivity.
Use larger value
to
increase
FM
Stereo
lndicator Sensitivity.
f..
-23-