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Icom IC-7400 Manual

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91
MAINTENANCE
2001 NEW
SCAN
■ 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 near-
est Icom Dealer or Service Center.
PROBLEM POSSIBLE CAUSE SOLUTION REF.
RECEIVE
POWER
TRANSMIT
Power does not come on
when the [POWER] switch
is pushed.
No sounds come 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 PWR] 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 and/or duplex function are acti-
vated.
• [MIC GAIN] is set too far clockwise
• Split frequency or duplex function is not acti-
vated.
• 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 channels have not been
programmed.
•2 or more memory channels have not been
designated 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 [P.AMP/ATT] for 1 sec. to select “ATT OFF.”
• Select a suitable operating mode.
•Push [PBTC] for 1 sec. to reset the function
• Push [NB] to turn the noise blanker OFF.
•Push [P.AMP/ATT] 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 ham band.
• Rotate [RF PWR] 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 [F2 DUP] (in M1) to turn
the function OFF.
• Set [MIC GAIN] to a suitable position.
• Push [SPLIT] and/or [F2 DUP] (in M1) 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. 16
p. 92
p. 23
p. 24
p. 25
—
p. 74
pgs. 75,
76
p. 47
p. 23
p. 51
p. 50
p. 47
p. 52
p. 84
p. 19
p. 25
p. 25
p. 74
pgs. 75,
76
pgs. 47,
56
pgs. 44,
58
p. 25
pgs. 44,
58
p. 45
p. 24
pgs. 24,
81
p. 65
p. 62
p. 71
IC-7400.qxd 02.4.2 11:36 Page 91
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