Realistic STA-115 - Page 34

SYMPTOM
CAUSE AND
REMEDY
9) Speaker
works
normally
but head-
phone
does not
work.
(1
)
Defective
R901
(Left)
or
R902
(Right):
Change
defective
resistor(s).
(2)
Headphone
plug
does not
mate with
jack:
Replace
the
plug.
10)
All the
inputs work
normally except
AUX/TV
input.
(1)
Poor
contact
in AUX/TV input
jack:
Repair
or replace.
(2)
Poor contact in SELECTOR
switch:
Repair
or
replace the
switch.
11)
PHONO input inoperative
(1)
Poor contact in
PHONO input
jack:
Repair or
replace.
(2)
Faulty SELECTOR
switch:
Repair or
replace.
12)
TAPE
OUT
inoperative
(1
)
Poor
contact
In TAPE OUT
output
jack:
Repair
or
replace.
13)
TAPE lN inoperative
(1)
Poor contact in TAPE lN
input
jack:
Repair or replace.
14) No
AM
or
FM
(tuner
B+
voltage
is
13
-
14V.)
(1)
Broken secondary
winding
in the
power
transformer:
Replace.
(2)
Faulty
capacitor
C711 or C712:
Replace the defective
capacitor(s
).
(3)
Faulty resistor
R703:
Replace.
(4)
Defective
1C701:
Replace.
(5)
Short-circuit
in tuner B+ circuit:
Repair the short.
(6)
Poor contact in SELECTOR switch:
Repair
or
replace the switch.
15)
No
FM
(1)
Poor contact in SELECTOR switch:
Repair or replace.
(21
lC,
transistor, diode, resistor, capacitor.
inductor or
IFT of
FM
lF
circuit defective:
Replace the defective
part(s).
(3)
FM front end
defective:
Replace the defective
part(s).
(4)
Faulty FM antenna lead-in/circuitry:
Repair
or
replace the antenna
lead-in/circuitry.
16)
No AM
(1)
Poor
contact
in
SELECTOR switch:
Repair or
replace.
(2)
lC,
transistor,
diode, resistor, capacitor or
IFT of AM lF circuit
defective:
Replace the defective
part(s).
(3)
Bar-antenna
coil defective:
Repair
or
replace.
17) No
FM MPX
separation
(1
)
lmproper adjustment:
Readjust VR203 and
VR204.
(2\
lC2O2 in MPX
circuit
defective
Replace.
(3)
VR203, VR204 defective:
Replace
the trimmer resistor(s)
18)
No
STEREO
light
or
FM
stereo
does
not work.
(1)
Broken STEREO
indicator
LED
D807:
Replace.
(2)
Defective
lC2O2
of
FM MPX circuit:
Replace
the defective
lC.
(3)
VR204 defective
or
misadjusted;
Replace the defective
trimmer resistor
or
adjust
-34