Icom IC-905, Basic Manual

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10-3
BASIC MANUAL
10
MAINTENANCE
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.
L
See the Advanced Manual for the problems when communicating through a repeater.
L
“AM” indicates the PDF type Advanced manual.
L
“CG” indicates the Connection guide.
Problem Possible cause Solution REF.
Power does not turn ON when
is pushed.
The power cable is not properly
connected.
Properly reconnect the DC power
cable.
p. 2-2
The external power supply is turned
OFF.
Turn ON the external power supply. –
A DC power cable fuse is 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 audio level is too low.
Rotate clockwise to
obtain a suitable listening level.
p. 3-1
The squelch is closed. Adjust the squelch level. p. 3-9
The external speaker is connected. Disconnect the external speaker. –
In the FM mode, the Tone Squelch
function is turned ON.
Turn OFF the Tone Squelch function. AM
In the ATV mode, “ATV Audio Sub
Carrier Frequency” is set to “OFF.”
Set “ATV Audio Sub Carrier
Frequency” to other than “OFF.”
AM
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 set too low.
(“RFG” is displayed.)
Set the RF gain higher until “RFG”
just goes off.
p. 3-9
The antenna is defective, or the
coaxial cable is defective.
Repair the problem and then
reconnect the antenna.
–
You are using an antenna that is not
suitable for the band you have selected.
Connect an antenna suitable for the
operating band.
p. 13-5
The squelch is closed. Adjust the squelch level. p. 3-9
The transceiver automatically
switches to transmit while receiving.
The VOX function is ON.
Push to turn OFF the VOX
function.
AM
The VOX gain is set too high. Adjust the VOX gain.
The transceiver receives the SEND
signal from the software on the PC.
Confirm the “USB SEND” setting. p. 8-15
No power output or the output power
is too low.
The operating frequency is outside a
ham band.
Set the frequency to a ham band. p. 3-3
The transmit output power is set too
low.
Adjust the RF POWER in the Multi-
function menu.
p. 3-11
The modulation input signal level is
set too low.
Adjust the MIC GAIN level in the
Multi-function menu.
p. 3-9
The output power is limited because
of power amplifier protection.
Stop transmitting, and then wait
until the temperature of the power
amplifier FET drops sufficiently.
AM
The microphone is bad, or the [MIC]
jack is shorted or defective.
Test the microphone and check the
[MIC] jack.
p. 13-1
The antenna SWR is more than 3:1. Adjust the antenna for an SWR of
less than 3:1.
AM
In the ATV mode, the input from [AV-
IN] is excessive (over deviation).
The TX indicator blinks red.
Set “AV-IN Video Input Level” to a
lower level.
AM