TC- 446 Service Manual
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30
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Repair Example
:
(Tested by communication test set after power on)
1) Symptom: TX OK; no RX at all, but RX frequency OK; no-solder at one end of crystal X1;
Cure: touch up X1
2) Symptom: TX OK; low RX sensitivity or intermittent RX output;
Cure: replace 455KHz filter
3) Symptom: TX OK; low RX sensitivity, but sensitivity OK after injecting 45.05MHz signal into XF1;
Cure: adjust TC3, TC4, and TC5 in turn
2
、
No RX audio output
(
no audio from SPK, sound abnormal
)
:
Symptom 1: no audio after power on/no or low audio in monitor mode
:
(
activate power-on alert tone
and monitor features
)
Содержание TC-446
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