ICOM ic-756pro 取り扱いマニュアル

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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 near-
est Icom Dealer or Service Center.

Power does not come on
when the [POWER] switch
is pushed.

• DC power cable is improperly connected.
• Fuse is blown.

• Reconnect the DC power cable correctly.
• Check for the cause, then replace the fuse with

a spare one.
(Fuses are installed in the DC power cable and
the internal PA unit.)

p. 17
p. 75

No sound comes from the
speaker.

• Volume level is too low.

• The squelch is closed.

• The transceiver is in the transmitting condition.

• Rotate [AF] clockwise to obtain a suitable

listening level.

• Rotate [RF/SQL] to 10 o’clock position to open

the squelch.

• Push [TRANSMIT] to receive or check the

SEND line of an external unit, if desired.

p. 2

p. 3

p. 2

Transmitting is impossi-
ble.

• The operating frequency is not set to a ham

band.

• Set the frequency to a ham band.

p. 24

Sensitivity is low.

• The antenna is not connected properly.
• The antenna for another band is selected.

• The antenna is not properly tuned.

• The attenuator is activated.

• Reconnect to the antenna connector.
• Select an antenna suitable for the operating

frequency.

• Push [TUNER] for 2 sec. to manually tune the

antenna.

• Push [ATT] one or more times to select “ATT

OFF.”

—

pgs. 5,
45
p. 48

p. 5

Receive audio is distorted.

• The operating mode is not selected correctly.
• PBT function is activated.
• Noise blanker function is activated.
• Preamp is activated.

• The noise reduction is activated and the [NR]

control is set too far clockwise.

• Select a suitable operating mode.
• Push [PBT CLR] for 2 sec. to reset the function.
• Push [NB] to turn the function OFF.
• Push [P.AMP] once or twice to turn the function

OFF.

• Set the [NR] control for maximum readability.

p. 26
p. 26
p. 27
p. 5

p. 27

The [ANT] switch does not
function.

• The antenna switch has not been activated.

• Set the antenna switch in set mode to “Auto” or

“Manual.”

p. 45

Programmed scan does
not stop.

• Squelch is open.
• [RF/SQL] is assigned to RF gain control and

squelch is open.

• Set [RF/SQL] to the threshold point.
• Reset [RF/SQL] control assignment and set it to

the threshold point.

p. 3
pgs. 
3, 68

Output power is too low.

• [RF POWER] is set too far counterclockwise.
• [MIC GAIN] is set too far counterclockwise.
• The antenna for another band is selected.

• The antenna is not properly tuned.

• Rotate [RF POWER] clockwise.
• Set [MIC GAIN] to a suitable position.
• Select an antenna suitable for the operating

frequency.

• Push [TUNER] for 2 sec. to manually tune the

antenna.

p. 3
p. 2
p. 5

p. 48

No contact possible with
another station.

• RIT or 

∂

TX function is activated.

• Split frequency function and/or dualwatch are

activated.

• Push [RIT] or [

∂

TX] to turn the function OFF.

• Push [SPLIT] and/or [DUALWATCH] to turn the

function OFF.

p. 6
pgs. 7 
31, 32

Transmitted signals are
distorted.

• [MIC GAIN] is set too far clockwise.

• Set [MIC GAIN] to a suitable position.

p. 2

Repeater cannot be
accessed.

• Split frequency function is not activated.
• Programmed subaudible tone frequency is

wrong.

• Push [SPLIT] to turn the function ON.
• Reset the frequency using set mode.

p. 7
p. 46

Programmed scan does
not start.

• The same frequencies have been programmed

in scan edge memory channels P1 and P2.

• Program different frequencies in scan edge

memory channels P1 and P2.

p. 52

Memory scan does not
start.

• 2 or more memory channels have not been

programmed.

• Program 2 or more memory channels.

p. 52

Select memory scan does
not start.

• 2 or more memory channels have not been

designated as select channels.

• Designate 2 or more memory channels as select

channels for the scan.

pgs. 51,
59