Icom IC-905, Основное руководство

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10-4
BASIC MANUAL
MAINTENANCE
10
10
Troubleshooting
Problem Possible cause Solution REF.
The transmit signal is unclear or
distorted in the SSB mode.
The transceiver’s microphone gain is
too high.
Adjust the MIC GAIN level so that the
meter reading swings between 30
and 50% of the ALC scale.
p. 3-9
The received audio in the SSB mode
is unclear or distorted.
The incorrect sideband is selected. Toggle between USB and LSB. p. 3-2
The PBT function is activated.
Hold down to clear the
settings.
p. 4-5
Cannot contact with another station,
even if receiving and transmitting
seem normal.
The Split function is ON, and the
transmit and receive frequencies are
different. ( is displayed.)
Touch [SPLIT] in the FUNCTION
screen to turn OFF the Split function.
p. 4-11
The RIT function or the
∂
TX function
is ON, and the transmit and receive
frequencies are different.
(“RIT” or “
∂
TX” is displayed.)
Push to turn OFF the
function.
p. 4-2
There is no response after
transmitting.
The Duplex function is ON, and the
transmit and receive frequencies are
different.
Touch [DUP] several times in the
FUNCTION screen to turn OFF the
Duplex function.
AM
The operating frequency does not
change when rotating .
The Dial Lock function is ON.
Hold down to turn OFF the Dial
Lock function.
p. 3-8
In the VFO mode, the operating
frequency is not properly changed by
rotating .
The function assigned to is
wrong.
Push to turn OFF the RIT or
∂
TX function.
p. 4-2
Hold down to assign the
kHz Tuning Control or Select the
Memory Channel function.
p. 1-8
The display turns OFF. The Screen Saver function is ON.
(The POWER indicator blinks green.)
Operate something (push key, and so
on) to reset the screen saver startup
time.
p. 8-18
The backlight brightness
automatically changes.
The Auto Adjust function is ON. Touch [Auto Adjust] in the “LCD
Backlight” screen to turn OFF the
Auto Adjust function.
(“Auto Adjusting” disappears.)
p. 8-18
A Programmed scan does not start. The same frequencies have been set
in the scan edges (00 ~ 24).
Set different frequencies in the scan
edges.
AM
A Memory scan does not start. No, or only 1 memory channel is set. Set at least 2 memory channels. AM
A Select memory scan does not start. No, or only 1 memory channel is
assigned as a Select channel.
Assign at least 2 memory channels
as Select channels for the scan.
AM
While operating in the Memory mode,
you changed the operating frequency,
mode, and so on, but a selected
memory channel contents are not
changed.
They were not overwrote already in
the selected memory.
When you want to save the changed
settings, touch [MW] for 1 second to
write them into the memory channel
on the VFO/MEMORY screen.
AM
Cannot hear the speech after
pushing .
The speech level is too low. Adjust “SPEECH Level” in the
Speech setting.
p. 8-4
“OVF” is displayed. An excessively strong signal is being
received.
Set the RF gain lower.
(“RFG” is displayed.)
p. 3-9
Turn ON the Attenuator. p. 4-1
Turn OFF the Preamplifier
(P.AMP OFF).
p. 4-1
The spectrum scope’s sensitivity is
too low, and only strong signals are
displayed.
The reference level is too low. Set the reference level to a higher
level.
p. 5-1