Troubleshooting; D Transceiver Power; D Transmit And Receive - Icom IC-718 Instruction Manual

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 you
nearest Icom Dealer or Service Center.

D Transceiver power

PROBLEM
Power does not come on • Power cable is improperly connected.
when the [POWER] switch is • The internal power supply is turned OFF.
pushed. • Circuit breaker is tripped.

D Transmit and receive

PROBLEM
No sounds from the speaker. • Volume level is too low.
• The squelch is closed.
• The transceiver is in transmit.
Sensitivity is too low, and only • The antenna is not connected properly.
strong signals are audible. • The antenna for another band is selected.
• The antenna is not properly tuned.
• The attenuator is activated.
Received audio is unclear or • Wrong operating mode is selected.
distorted. • 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 [ANT] switch does not • The antenna switch has not been activated.
function
Transmitting is impossible. • The operating frequency is not inside a ham
band.
Output power is too low. • [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.
No contact can be made with
another station. • Split frequency function is activated.
Transmit signal is unclear or • [MIC] is set too far clockwise
distorted.
Repeater cannot be ac - • Split frequency function is not activated.
cessed. • Programmed subaudible tone frequency is
wrong.
POSSIBLE CAUSE
POSSIBLE CAUSE
MAINTENANCE
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 and hold [TUNER] for 1 sec. to manually
tune the antenna.
• Push [ATT] (MF4) several times to select "ATT
OFF."
• Select a suitable operating mode.
• Push and hold [PBT-CLR] for 1 sec. to reset
the function.
• Push [NB] to turn the noise blanker OFF.
• Push [P.AMP] (MF3) 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 and hold [TUNER] for 1 sec. to manually
tune the antenna.
• Push [RIT] or [∂TX] to turn the function OFF.
• Push [SPLIT] 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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