Icom IC-7300 HF Plus Full Manual page 138

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14
MAINTENANCE
Troubleshooting (Continued)
PROBLEM
The transceiver
automatically switches
to transmit while
receiving.
Cannot contact with
another station even
if receiving and
transmitting seem
successful.
Received audio in the
SSB mode is unclear or
distorted.
Transmit signal is
unclear or distorted in
the SSB mode.
The displayed
frequency does not
properly change by
rotating .
MAIN DIAL
Programmed scan does
not start.
Memory scan does not
start.
Select memory scan
does not start.
The contents of a
selected memory
channel is not changed.
Cannot hear the speech
after pushing .
SPEECH
The antenna SWR is
too high.
"OVF" is displayed.
The touch screen is not
working correctly.
POSSIBLE CAUSE
The VOX function is ON.
The VOX gain is set too high.
The Split function is activated.
( The transmit and receive
frequencies are different.)
The RIT function or the ∂TX function
is ON and a different receive or
transmit frequency is set.
The incorrect sideband is selected.
The PBT function is activated.
The transceiver MIC gain is too high. Adjust the MIC gain level so that the
The MIC gain of the desktop
microphone is too high.
The Dial Lock function is activated.
The same frequencies have been
set in scan edge memory channels
P1 and P2.
0 or only 1 memory channel is set.
0 or only 1 memory channel is
designated as a Select channel.
The contents of the selected memory
channel were changed, but they are
not saved.
The speech level is too low.
The antenna is not properly tuned.
The coaxial cable is not suitable.
Excessively strong signal is
received.
The touched point and the detected
point may be different.
SOLUTION
Push
VOX/BK-IN
function
Adjust the VOX gain.
to turn OFF the function. p. 4-13
Push
SPLIT
Push or
RIT
TX
function.
Toggle between USB and LSB.
Hold down
TWIN PBT
settings.
meter reading swings between 30
and 50% of the ALC scale.
Hold down
SPEECH
function OFF.
Set different frequencies in scan
edge memory channels P1 and P2.
Set at least 2 memory channels.
Designate at least 2 memory
channels as Select channels for the
scan.
When you want to save the changed
settings, touch [MW] for 1 second to
write them into the memory channel
in the VFO/MEMORY screen.
Adjust the speech level in the
Speech setting.
Adjust the antenna SWR.
The antenna SWR should be less
than 3.
Use a coaxial cable whose
characteristic impedance is 50 Ω.
Rotate
AF RF/SQL
clockwise.
Turn ON the attenuator.
Calibrate the touch screen.
14-6
p. 4-10
to turn OFF the VOX
p. 4-10
p. 4-3
to turn OFF the
p. 4-11
p. 3-3
p. 4-5
to clear the
CLR
p. 3-11
p. 3-10
to turn the Dial Lock
p. 10-3
p. 9-3
–
p. 9-3
p. 12-6
p. 13-2
p. 17-2
p. 3-10
(outer) counter
p. 4-3
p. 14-3
REF.