Maintenance; E Troubleshooting - Icom IC-756 Instruction Manual

1 O MAINTENANCE
E Troubleshooting
Power does not come on
when the [POWER] switch
is pushed.
e DC power cable is improperly connected.
e Fuse is blown. i
, p. 16
and the internal PA unit.)
No sound comes from the | Volume level is too low.
speaker.
e Rotate [RF/SQL] to 10 o'clock position to open
the squelch.
Push [TRANSMIT] to receive or check the
SEND line of an external unit, if desired.
e The squelch is closed.
e The transceiver is in the transmitting condition.
Sensitivity is low. ¢ The antenna is not connected properly.
e The antenna for another band is selected.
e Reconnect to the antenna connector.
e Push [TUNER] for 2 sec. to manually tune the
antenna.
OFF."
The antenna is not properly tuned.
The attenuator is activated.
Receive audio is distorted.
e The operating mode is not selected correctly.
¢PBT function is activated.
e Noise blanker function is activated.
¢Preamp is activated.
e Select a suitable operating mode.
e Set [TWIN PBT] to the center position.
e Push [NB] to turn the function OFF.
e Push [P.AMP] once or twice to turn the function
OFF.
e Set the [NR] control for maximum readability.
e The noise reduction is activated and the [NR]
control is set too far clockwise.
+ Push [TUNER] for 2 sec. to manually tune the
antenna.
e The antenna is not properly tuned.
¢RIT or ATX function is activated.
e Split frequency function and/or dualwatch are
activated.
No contact possible with
another station.
e Push [RiT] or [ATX] to turn the function OFF.
e Push [SPLIT] and/or [DUALWAT CH} to turn the
function OFF.
Transmitted signals are
distorted.
Repeater cannot be
4 accessed.
e Split frequency function is not activated.
e Programmed subaudible tone frequency is
wrong.
*Push [SPLIT] to turn the function ON.
e Reset the frequency using set mode.
e Squelch is open.
¢(RF/SQL] is assigned to RF gain control and
squelch is open.
the threshold point.
2,56
J start. programmed.
| Programmed scan does
J] notstop.