Icom IC-720 Instruction Manual page 32

Problem
The RIT LED goes out even
though you did not depress the
БІТ ON/OFF switch to turn it
OFF.
The frequency does not change
by rotating the Tuning knob.
Possible Cause
Solution
The RIT is automatically turned off when
the Tuning Knob is rotated unless the
interior RIT contro! switch is in the off
position.
The Power switch has been turned off.
You may change the unit so that the automatic
RIT OFF function does not operate when you
rotate the Tuning knob. (See page 13.)
Depress the RIT ON/OFF switch again to turn
on the RIT.
DIAL LOCK is engaged.
Disengage the DIAL LOCK by pressing the DIAL
| Lock button.
An abnormal figure is displayed
оп ап LED, or an LED fails to
illuminate.
ЕЕЕ.
The Power switch was turned off апа on
too quickly.
An unusual amount of distortion
and/or noise in the transmit
signal.
08
Turn the Power switch off, wait а few seconds, and
then turn it on again.
The MIC GAIN is too high when the RF
Speech Processor is on.
15. Unable to key when using an
electronic keyer.
16.
In the AM mode there is no
modulation.
While watching the meter in the ALC mode, turn
the МІС GAIN control counterclockwise so that
the meter indicates approximately OdB at the
voice peak.
The Switching circuit of the electronic keyer
does not close completely.
Polarity of the connection wires from the
keyer is reversed.
The MODE switch is not in the CW or CW-N
position.
AE
Mic Gain is too low.
Mic connector
inoperable.
loose, or microphone
When the set has been tuned to
a freq other than 7.100MHz
Ham, or 15.0000MHz Gen
Coverage, and the set goes to
one of those freqs when turned
on.
Replace the keyer with one having a voltage of less
than .4V between the two keying lines at the key
down position, or modify your keyer so that the
voltage is less than .4 Volts.
Connect the keyer wires observing proper polarity.
Place the MODE switch
position.
in the CW or CW-N
Adjust the Mic Gain clockwise.
Check and tighten mic connections, replace mic if
necessary.
Memory Backup is not connected to a
power supply, or Memory Backup Power
Supply has failed.
Check Memory Backup Power Supply for loose
connections, or faults.
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