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Symptom
Cause and Remedy
Treble control has no effect
A) Variable resistor TREBLE defective.
B) Defective R711 L/R, R712 L/R, C709 L/R, C710L/R
Replace the defective components(s).
Auto tune inoperative (UP/DOWN}
A) Poor contact in Up/Down key.
Repair or replace.
B) Defective IC401
Replace.
C) Defective FL401,
Replace.
D) Defective tuner circuit component.
Replace.
E) In case of FM only, improper adjustment of FM
front-end.
Readjust.
Manual tune inoperative (UP/DOWN)
(AM or FM)
A) Poor contact in Up/Down key.
Replace.
B) Defective 1C401.
Replace.
Memory setting (keys 1-10)
inoperative
FL inoperative
A) Poor contact in memory keys 1-10.
Replace.
B) Poor contact in memory set key.
Replace.
C) Defective IC401.
Replace the defective component.
A) FL defective.
Replace.
B) Defective 10401,
Replace
C) Defective X401.
Replace.
Noise Volume control
A) Defective IC603.
Replace.
B) Defective capacitor C615 or C616.
Replace the defective capacitor(s).
Remote Control Unit inoperative
A) Weak Battery.
Replace.
B) Defective.
Replace.
C) Defective IC401(CPU Board) or IC01.
Replace.
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