9 TROUBLESHOOTING

The following chart is designed to help you correct problems which 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.

POWER SUPPLY

RECEIVE

PROBLEM

 

POSSIBLE CAUSE

SOLUTION

REF.

Power does not

come

DC power cable is improperly

Reconnect the power cable correctly.

p. 13

on when the [POWER]

connected.

 

 

switch is pushed.

 

 

 

 

 

 

Fuse is blown.

Check for the cause, then replace the

p. 56

 

 

 

fuse with a spare one.

 

 

 

 

(Fuses are installed in two places. One is

 

 

 

 

installed in the DC power cable and the

 

 

 

 

other is installed in the PA unit.

 

 

 

Battery is exhausted if you are using

Check the battery voltage with the

 

 

a 12 V battery as the power source.

[POWER] pushed IN.

 

No sound comes

from

Volume level is set too low.

Rotate [AF] clockwise to obtain a suit-

p. 1

the speaker.

 

 

able listening level.

 

 

 

The squelch is closed.

Rotate [SQL] counterclockwise to

p. 1

 

 

 

open the squelch.

 

 

 

The transceiver is in the transmitting

Release [PTT] on the microphone or

 

 

condition.

check the SEND line of an external

 

 

 

 

unit, if connected.

 

 

 

An external speaker or headphones

Check the external speaker or head-

p. 12

 

 

are connected.

phone plug connection.

 

 

 

 

Check the speaker ON/OFF switch or

p. 12

 

 

 

speaker A/B switch, when an optional

 

 

 

 

SP-20EXTERNAL SPEAKER is in use.

 

 

 

 

 

 

Sensitivity is low.

 

The antenna is not connected properly.

Reconnect to the antenna connector.

 

 

The antenna feed line is cut or shorted.

Check the feed line and correct any

 

 

 

 

improper conditions.

 

 

The antenna for another band is

Select an antenna suitable for the

p. 14

 

 

selected.

operating frequency.

 

 

 

 

Make sure that [ANT1] is used for

 

 

 

 

frequencies less than 60 MHz and

 

 

 

 

[ANT2] is used for frequencies of 60

 

 

 

 

MHz and above.

 

 

 

The antenna is not properly tuned.

Push [TUNE] to manually tune the

pgs. 27,

 

 

 

antenna.

28

 

 

The attenuator function is activated.

Push [ATT] to turn the function OFF.

p. 21

 

 

 

 

Receive audio is distor-

The operating mode is not selected

Select a suitable operating mode.

p. 19

ted.

 

correctly.

 

 

 

 

The [SHIFT] control is set off-center.

Set [SHIFT] to the center position.

p. 20

 

 

 

 

Receive signal is distor-

Noise blanker function is activated.

Push [NB] to turn the function OFF.

p. 21

ted with strong signals.

 

 

 

 

 

Preamp is activated.

Push [P.AMP] to turn the function

p. 21

 

 

 

OFF.

 

 

 

 

 

 

57

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Icom iC-706MKTMG, HF/VHF/UHF ALL MODE TRANSCEIVER Troubleshooting, Power Supply Receive Problem Possible Cause Solution