Realistic STA-21 - Page 13

Symptom
Cause/Remedy
9)
"TAPE
OUT"
inoperative.
1) Poor
contact in
"TAPE
OUT"
ouput
jack.
*.
Repair
or
replace
it.
'10)
No AM
or FM.
(TUNER
B + voltage
is
not l1-12 V).
1) Broken
tertiary
winding
in
the
power
transformer.
*
Replace
the
transformer.
2) Defective
diode
D
305,306
or
D314.
*
Change the
defective
diode(s).
3)
Faulty
capacitor
C 3n,324,
or 325.
x
Change it.
4) Defective
resistor
R
337.
*
Replace
the
resistor.
5l Zener diode
D
314 defective.
*
Replace
the diode.
6) Short circuit in TUNER
B +
circuit.
*
Remove
the
short.
7) Poor contact in
selector
switch.
*
Repair
or
replace
it.
11) No FM.
1) Poor
contact
in
selector
switch.
x
Repair
or replace
it.
2)
Defective
resistor
or capacitor
of FM Tuner
circuit.
*
Replace
the defective
part(s).
3) Transistor,
diode,
lFT,
resistor
or capacitor
of
FM Tuner
&
lF
board
defective.
*
Replace
the defective
part(s).
4)
Faulty
FM
Antenna
lead-in/circuitry.
*
Repair
or replace
the Antenna
lead-in,/circuitry.
12) No AM.
1)
Poor
contact
in
selector
switch.
{<
Repair
or
replace
the switch.
2) Transistor,
diode,
lFT, resistor
or capacitor
of AM
lF defective.
*
Replace
the
defective part(s).
3) Bar-Antenna
coil defective.
*
Repair
or
replace
it.
13) No MPX
separation.
1
)
lmproper
adjustment.
x
Readjust it.
2)
lC
of MPX
board
defective.
x
Replace
the
lC.
3)
VR
102
or 103
(Trimmer
resistor)
defective.
x
Replace
it.
14) No stereo
light.
1) STEREO
Lamp burned
out.
*
Replace
the lamp.
2) Defective
lC
of MPX board.
{.
Change the defective
lC.
15) FM
STEREO does
not
works.
1) Defective
lC
(LA
3350).
x
Replace
it.
2) Defective
VR 102
or 103.
x
Replace
it.
3)
Defective
transistor,
resistor,
capacitor
or diode
of
FM
MPX circuit.
x
Replace
the defective part(s).
4) Defective
STEREO lamp PL
5.
x
Replace
it.
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