Trouble Shooting - Icom IC-730 Instruction Manual

SECTION 8 TROUBLE SHOOTING
Your IC-730 has been carefully adjusted at the factory prior to shipping. The chart below has been provided to help you correct
problems which are not equipment malfunctions. If you are unable to locate the trouble, or correct the fault, please contact your
dealer or the nearest ICOM Service Center.
Problem
1. Power does net come on when
the switch is pushed.
2. No sound comes from the speaker.
3. Sensitivity is low and only strong
signals are audible.
4. During receive, the "S" meter is
higher than the "O" position even when
there is no signal.
5. Only incomprehensible voices are
heard during SSB reception.
6. The tone of the received signal is
very high or low pitched.
7. No output power or low output power.
8. The receive mode functions properly
and your signals are transmitted, but
you are unable to make contact with
another station.
9. The heat sink on the rear panel
becomes hot.
Possible Cause
Power cable is improperly connected.
Power cord is connected with the
polarity reversed.
Blown fuse.
AF GAIN control knob is completely
counterclockwise.
The unit is in the transmit mode, either
by the T/R switch or the PTT switch on
the microphone.
The external speaker cable is
connected to the unit but not to the jack
on external speaker.
The internal speaker cable is not
connected.
A headphone is connected to the
PHONES jack.
RF GAIN control knob is turned counter-
clockwise.
The antenna feed line is cut or shorted.
RF GAIN control knob is turned counter-
clockwise.
Receiving the wrong sideband.
Maladjustment of the P.B Shift control.
MIC GAIN setting is too low.
When SSB is desired, but the MODE is
in the CW or CW-N.
PTT switch is not functioning due to
improper connection of the mic
connector.
The antenna feed line is cut or shorted.
The NOR /SPT switch is in the SPT
position.
The receive frequency is offset from the
transmit frequency by the RIT control.
The heat sink on the rear panel is for
the final transistors and may become
as hot as 40°C (104°F) above room
temperature.
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Solution
Carefully reconnect power cable.
Disconnect the power cord, replace the
blown fuse, then reconnect the power
cord observing proper polarity.
Check for the cause, then replace the
fuse with a spare one.
If using an IC-PS15, also check its fuse.
Turn the knob clockwise to a suitable
level.
Put the unit in the receive mode.
Connect the cable to the speaker jack
on the external speaker.
Connect the speaker connection.
Unplug the headphone.
Turn the RF Gain control knob fully
clockwise.
Check the feed line and correct any
improper condition.
Turn the knob fully clockwise.
Set the sideband opposite the one you
are using, either USB or LSB.
Set the P.B. Shift control knob to the
clear tone position.
Turn the MIC GAIN control clockwise to
the center (12 o'clock) position, or more.
Set the MODE to the SSB (USB or
LSB).
Check the connection of the MIC
connector and correct any problems.
Check the antenna feed line and correct
any improper connection.
Set the NOR/SPT switch to the NOR
position.
Turn OFF the RIT, or set the RIT control
knob to the center (12 o'clock) position.
Make sure the area around the unit has
as much ventilation as possible.