Realistic STA-85 - Page 14

SYMPTOM
CAUSE
AND
REMEDY
13)
FM does not
operate.
A)
Defective resistor
R 107, R114,
R207, R316,
R317
or
R235.
Replace
the defective
resistor(s).
Short
circuit in Tuner
B+
circuit
Repair
the
short.
Poor
contact
in
selector switch
SW1
Repair
or replace the switch.
Defective diode D201
Replace
the diode.
Capacitor
C301
defective
Replace
the
capacitor.
Defective
transistor TR201 or lC 1C201
Replace the
defective component.
Defective IFT T201
Replace the lFT.
Defective
capacitor
C2
1 1
Replace
the
capacitor.
Defective
transistor TR
101, TR 102, TR 103 or Coil
L101, L1O2, Ll03
of Tuner Board 0055
Replace the
defective
component(s).
Faulty lead-in
Repair
or
replace
the lead-in.
B}
c)
D)
E)
F)
G)
H)
t)
J)
14l Poor
multiplex
separation
A) lmproper
adjustment
Readjust
T2O1, VR301
and
VR302.
(Refer
to MPX
ALIGNMENT on
page
9)
B) Defective lC
1C301
Replace
the lC.
C)
Variable
resistor VR301
or VR302 defective.
Replace
the variable resistor(s).
15) Stereo indicator
does not
light.
A)
Defective LED
D303
Replace
the LED.
B)
Defective lC 1C301
or resistor R322
of Tuner board
0055
Replace the defective
component(s) .
C) Defective
diode D301
Replace the
diode.
16) FM
volume
not
sufficient.
A)
lf
volume
of both L
and
R
channels
not enough
Front End
defective,
or
faulty
transistor TR201
lC 1C201,
IFT T201
or diode D2O3,
capacitor
C211 or faulty
TR301, TR302, tC301
or C301
of Tuner Board 0055
Replace
the defective
component(s).
B) lf
sound of one channel
not enough: Defective
L301 in
case
of L
channel, or defective L302 in
case of R
channel
Replace
the defective
coil.
14