D Transceiver Power; D Transmit And Receive; I Troubleshooting - Icom IC-7800 Instruction Manual

13
MAINTENANCE

I Troubleshooting

D D Transceiver power
PROBLEM
Power does not come on
when the [POWER] switch
is pushed.
D D Transmit and receive
PROBLEM
No sounds come out from
the speaker.
Sensitivity is too low, and
only strong signals are
audible.
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
accessed.
POSSIBLE CAUSE
• Power cable is improperly connected.
• The internal power supply is turned OFF.
• Circuit breaker is tripped.
POSSIBLE CAUSE
• 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 inside a ham
band.
• [RF PWR] is set too far counterclockwise
• [DRIVE] is set too far counterclockwise
• [MIC] 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] is set too far clockwise
• Split frequency function is not activated.
• Programmed subaudible tone frequency is
wrong.
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 you near-
est Icom Dealer or Service Center.
SOLUTION
• Re-connect the AC power cable correctly.
• Turn the internal power supply ON.
• Check for the cause, then re-set the circuit
breaker.
SOLUTION
• Rotate [AF] clockwise to obtain a suitable lis-
tening level.
• Turn [SQL] to 10 o'clock position to open the
squelch.
• Push [TRANSMIT] to receive or check the
SEND line of an external unit, if connected.
• Re-connect to the antenna connector.
• Select an antenna suitable for the operating
frequency.
• 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 be in a ham band.
• Rotate [RF PWR] clockwise.
• Set [DRIVE] to a suitable position.
• Set [MIC] to a suitable position.
• Select an antenna suitable for the operating
frequency.
• 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] to a suitable position.
• Push [SPLIT] to to turn the function ON
• Reset the frequency using set mode.
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