10
MAINTENANCE
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19
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21
10-6
Troubleshooting
The following chart is designed to help you solve problems that are not equipment malfunctions.
If you are unable to locate the cause of a problem, or solve it through the use of this chart, contact your nearest
Icom Dealer or Service Center.
PROBLEM
POSSIBLE CAUSE
SOLUTION
REF�
Power does not turn ON
when
POWER
is pushed.
The power cable is not connected
properly.
Reconnect the DC power cable properly. p. 2-1
The external power supply is turned OFF. Turn ON the external power supply.
The DC power cable fuses or circuitry
fuse are blown.
Find and repair the cause of the problem,
and then replace the damaged fuse with
a new one.
p. 10-1
No sound is heard from
the speaker.
The function that mutes the received
audio of the SUB band is turned ON.
Turn OFF the Sub Band Mute function.
p. 8-2
The audio level is too low.
Rotate
AF
RF/SQL
(inner) clockwise to
obtain a suitable listening level.
p. 3-1
The squelch is closed.
Rotate
AF
RF/SQL
(outer) to the 12
o’clock position to open the squelch.
Headphones are connected.
Disconnect the headphones.
p. 1-1
In the FM mode, the Tone Squelch
function is turned ON.
Turn OFF the Tone Squelch function.
–
Sensitivity is too low, and
only strong signals are
heard.
The attenuator is activated.
Turn OFF the attenuator.
p. 4-1
RF gain control is activated.
(
is displayed.)
Set the RF gain higher until RFG just
goes off.
(
disappears.)
p. 3-10
The antenna is defective or the coaxial
cable is defective.
Repair the problem and then reconnect
the antenna.
p. 13-3
You are using an antenna that is not
suitable for the band you have selected.
Connect an antenna suitable for the
operating band.
The squelch is closed.
Rotate
AF
RF/SQL
(outer) to the 12
o’clock position to open the squelch.
p. 3-10
The transceiver
automatically switches to
transmit while receiving.
The VOX function is ON.
Push
VOX/BK-IN
to turn OFF the VOX
function.
–
The VOX gain is set too high.
Adjust the VOX gain.
No power output or the
output power is too low.
The transmit output power is set too low. Adjust the RF POWER in the Multi-
function menu.
p. 3-10
The modulation input signal level is set
too low.
Adjust the microphone gain in Multi-
function menu.
p. 3-11
The output power is limited because of
power amplifier protection.
Stop transmitting, and then wait without
turning off the transceiver until the
temperature of the power amplifier FET
drops sufficiently.
p. 3-10
The microphone is bad, or the [MIC]
connector is shorted or defective.
Test the microphone and check the [MIC]
connector.
p. 13-3
The antenna SWR is more than 3:1.
Adjust the antenna for an SWR of less
than 3:1.
p. 3-11
Transmit signal is unclear
or distorted in the SSB
mode.
The transceiver’s microphone gain is too
high.
Adjust the MIC GAIN level so that the
meter reading swings between 30 and
50% of the ALC scale.
p. 3-11
The desktop microphone gain is too high.
Received audio in the
SSB mode is unclear or
distorted.
The incorrect sideband is selected.
Toggle between USB and LSB.
p. 3-3
The PBT function is activated.
Hold down
MULTI
, and then set to
clear.
p. 4-3
