Realistic STA-7 - Page 22

Symptom
Cause/Remedy
9)
"TAPE
OUT" inoperative
1)
Poor
contact in
"TAPE
OUT" output
jack
*Repair
or
replace
the
jack.
2) Defective
R227
or R228
*Replace
the
resistor(s).
10)
No
AM
or
FM
(Tuner
B+ voltage is
not
1 1-12V.1
1)
Blown fuse
1 A
(F2)
in
tertiary circuit
*Replace
fuse.
2) Defective
diode
D506
*Change
the defective
diode(s).
3)
Faulty
capacitor
C515
or 516
*Change
the defective
capacitor(s).
4) Defective
resistor
R503
*
Replace
the
resistor(s).
5) Defective
transistor TR503
*Replace
the transistor.
6) Broken
tertiary winding
in
the
power
transformer
*Replace
the
transformer.
7)
Short-circuit
in Tuner
+B
circuit
*Repair
the
short.
8)
Poor
contact
in
selector switch
*Repair
or
replace
the switch.
11) No FM
1)
Poor
contact in
Selector
switch
*Repair
or
replace
it.
2) Defective
resistor
or capacitor
of
FM
front-end
circuit
*Replace
the defective
part(s).
3)
Transistor,
diode, lFT, resistor
or capacitor
of
FM
lF
circuit
defective
*Replace
the defective
part(s).
4) Faulty
FM
Antenna
lead-in/circuitry
*Repair
or
replace
the
Antenna
lead-in/circuitry.
121 No
AM
1)
Poor
contact in
selector
switch
*Repair
or replace
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
*Readjust
it.
2) lC
of
MPX
board
defective
(1C101)
*Replace
the lC.
3) VR102
or 103
(Trimmer
resistor)
defective
*Replace
it.
14)
No
stereo
light
1) Broken
ST. lndicator
lamp
(PL701)
*Replace
the
lamp.
2) Defective lC
of
MPX
board
(|C101)
*Change
the
defective
lC.
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