Maintenance; Troubleshooting - Icom IC-910H Instruction Manual

11

MAINTENANCE

n Troubleshooting
The following chart is designed to help you correct
problems which are not equipment malfunctions.
PROBLEM
Power does not come on
when [POWER] is pushed.
No sounds comes from
the speaker.
Sensitivity is low.
Received audio is distort-
ed.
Transmitting is impossible.
Output power is too low.
No contact possible with
another station.
Transmitted signals are
distorted.
Repeater cannot be ac-
cessed.
Programmed scan does
not start.
Memory scan does not
start.
Mode select scan does not
start.
No announcement when
[SPCH] is pushed.
The displayed frequency
does not change properly.
76
POSSIBLE CAUSE
• DC power cable is improperly connected.
• Fuse is blown.
• Volume level is too low.
• The squelch is closed.
• The transceiver is in the transmitting condition.
• The antenna is not connected properly.
• The attenuator is activated.
• The S-meter squelch is activated.
• Incorrect sideband (USB/LSB) is selected.
• Receiving an FM signal.
• Noise blanker is activated.
• Noise reduction is activated.
• PTT lock function is activated.
• [RF PWR] is set too far counterclockwise.
• [MIC GAIN] is set too far counterclockwise.
• Split frequency operation or duplex operation is
activated.
• RIT function is activated.
• [MIC GAIN] to far clockwise.
• Duplex operation is not activated.
• No subaudible tone or incorrect tone frequen-
cy is selected.
• VFO mode is not selected.
• [RF/SQL] is assigned to RF gain and squelch
is opened.
• Memory mode is not selected.
• No memory channels are programmed.
• Mode select scan mode has not been selected.
• Only one channel is programmed with the se-
lected operating mode.
• The voice synthesizer unit has not been in-
stalled.
• The announcement level is set to "0" or too low.
• The announcement language is set to "oFF."
• The dial lock function is activated.
• The internal CPU has malfunctioned.
If you are unable to locate the cause of a problem
or solve it through the use of this chart, contact your
nearest Icom Dealer or Service Center.
SOLUTION
• Reconnect the DC power cable correctly.
• Check the cause, then replace the fuse with a
spare one. (Fuses are installed in the DC power
cable and the internal PA unit.)
• Rotate [AF] clockwise to obtain a suitable listen-
ing level.
• Rotate [RF/SQL] to 12 o'clock position to open
the squelch.
• Push [TRANSMIT] to receive or check the SEND
line of an external unit, if desired.
• Reconnect to the antenna connector.
• Push [ATT] to turn the attenuator OFF.
• Rotate [RF/SQL] to the position where the noise
just disappears.
• Switch USB and LSB by pushing [SSB/CW] for
1 sec.
• Push [FM] to select FM mode.
• Push [AFC/NB] to turn the noise blanker func-
tion OFF.
• Set the noise reduction level in the NR set mode
for maximum readability using [SET] and [AFC/
NB•NR], or turn OFF the function by pushing
[AFC/NB•NR] for 1 sec.
• Turn the PTT lock function OFF in the TRANSMIT
set mode using [SET] and [TRANSMIT].
• Rotate [RF PWR] clockwise.
• Rotate [MIC GAIN] clockwise.
• Push [SPLIT] momentarily or for 1 sec. to turn the
split or duplex function OFF.
• Push [RIT] to turn the RIT function OFF.
• Set [MIC GAIN] to a suitable level.
• Push [SPLIT•DUP] for 1 sec. to turn duplex op-
eration ON.
• Push [TONE] to activate the subaudible tone or
select a suitable tone frequency in the FM set
mode using [SET] and [FM].
• Push [V/M 1] to select VFO mode.
• Reset [RF/SQL] control assignment and set it to
the threshold point.
• Push [V/M 1] to select memory mode.
• Program desired frequencies into memory chan-
nels.
• Push [SPCH•LOCK] for 1 sec. on the desired op-
erating mode programmed channel.
• Program more than two channels with the de-
sired operating mode.
• Install the optional vice synthesizer unit, UT-102.
• Set the announcement level to a suitable level in
the SPCH set mode using [SET] and [SPCH].
• Set the announcement language to "Eng" (or JPn)
in the SPCH set mode using [SET] and [SPCH].
• Push [SPCH•LOCK] to turn the lock function OFF.
• Reset the CPU.
REF.
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