ICOM IC-756PRO2 Manuale Utente

11

77

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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.

No sounds comes out
from the speaker.

Sensitivity is too low, and
only strong signals are au-
dible.

Received audio is unclear
or distorted.

The [ANT] switch does not
function

Transmitting is impossible.

Output power is too low.

No contact possible with
another station.

Transmit signal is unclear
or distorted.

Repeater cannot be ac-
cessed.

Programmed scan does
not stop.

Programmed scan does
not start.

Memory scan does not
start

Select memory scan does
not start

• Power cable is improperly connected.
• Fuse is blown.

• Volume level is too low.

• The squelch is closed.

• The transceiver is in transmitting condition.

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

• The antenna is not properly tuned.

• The attenuator is activated.

• Wrong operating mode is selected.
• PBT function is activated.
• Noise blanker is turned ON when receiving a

strong signal.

• Preamp is activated.

• The noise reduction is activated and the [NR]

control is too far clockwise.

• The antenna switch has not been activated.

• The operating frequency is not set to a ham

band.

• [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.

• RIT or 

∂

TX function is activated.

• Split frequency function and/or dualwatch are

activated.

• [MIC GAIN] is set too far clockwise

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

wrong.

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

squelch is open.

• The same frequencies have been programmed

in scan edge memory channels P1 and P2.

• 2 or more memory channel have not been pro-
grammed.

• 2 or more memory channel have not been des-
ignated as select channels.

• Re-connect the DC power cable correctly.
• Check for the cause, then replace the fuse with

the spare one.

(Fuses are installed in the DC power cable and

the internal PA unit.)

• Rotate [AF] clockwise to obtain a suitable lis-

tening level.

• Turn [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.

• Re-connect to the antenna connector.
• Select an antenna suitable for the operating fre-

quency.

• Push [TUNER] for 1 sec. to manually tune the

antenna.

• Push [ATT] several times to select “ATT OFF.”

• Select a suitable operating mode.
• Push [PBT CLR] for 1 sec. to reset the function
• Push [NB] to turn the noise blanker OFF.

• Push [P.AMP] once or twice to turn the function

OFF.

• Set the [NR] control for maximum readability.

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

“Manual.”

• Set the frequency to a hum band.

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

quency.

• Push [TUNER] for 1 sec. to manually tune the

antenna.

• Push [RIT] or [

∂

TX] to turn the function OFF.

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

function OFF.

• Set [MIC GAIN] to a suitable position.

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

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

the threshold point.

• Program different frequencies in scan edge

memory channel P1 and P2.

• Program more than 2 memory channels.

• Designate more than 2 memory channels as se-

lect channels for the scan.

p. 17
p. 78

p. 2

p. 3

p. 2

—

pgs. 5,

46

p. 49

p. 5

p. 25
p. 25
p. 27

p. 5

p. 26

p. 46

p. 23

p. 3
p. 2
p. 5

p. 49

p. 6
pgs. 7,
31, 32

p. 2

p. 7
p. 47

p. 3
pgs. 3,

70

p. 53

p. 53

pgs. 52,

60