Realistic STA-720 - Page 14

SYMPTOM
CAUSE
AND
REMEDY
H)
DefectivetransistorTRl0l,
TR102, TR103 or
coil
L101, L104
Replace the defective
component(s).
l) Faulty lead-in
Repair
the faulty
lead-in.
13.
Poor
multiplex separation A)
lmproper
adjustment
Readjust VR302
(refer
to
ALIGNMENT
PROCEDURE
on
page
g).
B)
Transistor TR302, TR303
or
lC 1C301
of
Tuner
Board
#OO74
defective
Replace the defective
component(s).
C) Variable resistor
VR301
or
VR302
defective
Replace the defective variable resistor(s).
14. Stereo indicator
does not light. A) Defective indicator LED D406
Replace the
LED.
B)
lmproper
adjustment of
VR301
of
Tuner Board
#0o74
Make
readjustment.
(Refer
to
MPX ALIGNMENT
on
page
9.)
C) Defective
lC 1C301
or resistor
R426
Replace the defective component(s).
15. FM
volume not sufficient A) lf volume
of
both
L
and
R
channels
not enough:
Front-End
section
defective, or faulty
IFT T101
lC 1C201
or
transistor TR201 of
Tuner Board
#0074
Locate
and replace
the
defective component(s).
B)
lf
sound of
one channel
not enough:
Defective
TR302 in
case
of
L
channel,
or defective TR303
in case of
R
channel
Replace the defective transistor.
16. AM
does not
operate
A) Damaged
1C401
of
Tuner Board
#0074
Replace the lC.
Defective
L4O1,T4O1,T4O2
or CF401
Replace the
defective component(s).
One of
resistors of
Tuner Board
#0074
(AM
section)
defective
Replace the defective resistor.
One of capacitors of
Tuner Board
#0074
(AM
section) defective
Replace the defective capacitor.
AM switch 53 defective
Repair
or
replace the switch.
Defective
Tuning
gang
capacitor
Repair or replace.
Damaged AM Bar antenna
Repair or replace
bar
antenna.
B)
c)
D)
E)
F)
G)
14