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RADIO SECTION
SYMPTOM
DEFECTIVE
CIRCUIT
DEFECTIVE
POINT & POSSIBLE
CAUSE
No sound in
Power supply circuit
* Power supply circuit for radio is defective
LW/MW/FM
* Check QO03.
PLL circuit
Check QO02 and VT voltage of pin 6 of TUNOI (tunerpack).
* Check ICOO1 and pins 62, 63 and 64 of IC 601.
Tuner pack
* Check audio output of pins 18 and 19 of TUNO1.
RF input
* Check for poor contact of ANTO1.
No sound in
Power supply circuit
* Check QOOI.
FM
* Check voltage at pin 8 of TUNO1.
Tuner pack
* Check pin 12 of TUNO1 (OSC level) and audio output
at pins 18 and 19.
Insufficient
RF input
* Check for poor contact of ANTO1.
sound
Tuner pack
* Check audio output at pins 18 and 19 of TUNOI.
E-VOL
* Check pins 11 and 15 (RADIO-IN)
and 22, 23, 24 and
25 (output) of IC301
SEEK & Auto
PLL circuit
* Check VT voltage at pin 6 of TUNO1 (tuner pack ).
Store inoperative
* Check ICOO1.
* Check data at pin 62,63
and 64 of IC601.
No sound in
Power supply
* Check voltage of TUNO1 8, 10 pin.
MWILW
Tuner pack
* Check TUNO1 13 pin (OSC level) and audio output of
18, 19 pin,
—.
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