Icom IC-450 - Maintenance; Troubleshooting Common Issues

37
11
MAINTENANCE
10
11
■ Troubleshooting
If your transceiver seems to be malfunctioning, please check the following points before sending it to a service center.
PROBLEM POSSIBLE CAUSE SOLUTION REF.
The transceiver’s power
will not turn ON.
No sound is heard from
the speaker.
Sensitivity is low and only
strong signals can be heard.
No contact possible with
another station.
Cannot change the oper-
ating channel.
Scan does not start.
•Powerconnectorhaspoorcontact.
•Polarityofthepowerconnectionisreversed.
•Blownfuse.
•Volumeistoolow.
•Thevolumelevelissetto0(audiomuting).
•Squelchissettoohigh.
•Aselectivecallorsquelchfunctionisactivated
such as pocket beep or tone squelch.
•Antennafeedlineortheantennaconnectorhas
poor contact or is shorted.
•Theotherstationisusingtonesquelch.
•Thelockfunctionisactivated.
•Priorityscan is paused on the watching
frequency.
•Thesquelchisopen.
•Priorityscan is activated.
•Checktheconnectorpins.
•Reconnectthepowercableobservingtheproper
polarity.
•Repairthecause,thenreplacethefuse.
•Push
.
•Push
.
•Setthesquelchleveltothethreshold.
•TurnOFFtheappropriatefunction.
•Check,andifnecessary,replacethefeedlineor
solder the antenna connector again.
•TurnONtheToneSquelchfunction.
•Holddown
for 2 seconds to turn OFF the Lock
function.
•Push
to cancel the scan.
•Setthesquelchtothethresholdpoint.
•Cancelthescan.
—
p. 4
p. 38
p. 10
p. 10
p. 14
pp.
26–27
p. 5
p. 26
p. 14
p. 24
p. 14
p. 24