No audio output during UHF/VHF reception
Yes
No
No
Yes
No
Yes
Yes
No
Yes
Check IC301 and peripheral circuits.
Check circuits between IC801 and IC301.
Check the filter circuits (Q1104-5) and peripheral
circuits
Check the tuner and peripheral circuits.
Is SIF output from the tuner (TU1101_Pin15) normal?
Is input signal fed to pinA21 of IC801?
Are audio signals from pins B23 and D23 of IC801 to pins
6 and 1 of IC301 normal?
Check the connector (P301) of MAIN_UNIT and around the
speakers.
Are audio outputs of pins 15 and 11 of IC301 normal?
Is audio input from pins 23 and 25 of IC302 to pins 5 and 9
of IC303 normal?
No
Yes
Check the circuits between IC503 and IC302.
Are audio signals from pin 33 and pin 34 of IC503 to pin1
and pin 4 of IC302 normal?
No
Check the circuits between IC302 and IC303.
(MUTE circuits:Q301,Q302)
No
Yes
Check IC303 and peripheral circuits
Is audio output from IC303 normal?
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