Troubleshooting; E Troubleshooting Chart - Icom IC-707 Instruction Manual

me 9
TROUBLESHOOTING
Mi Troubleshooting chart
The following chart is designed to help you correct
problems which are not equipment malfunctions.
i Power does not come
1 ON.
; memory channel cannot
Hi be changed.
fee] No sound comes from
fee, the speaker.
Sensitivity is low.
Sh ; Receive signal is dis-
ga | torted with strong sig-
eee) nals.
e The DC power cable is improperly
connected.
e A fuse in the DC power cable or in the
PA unit is blown.
e For mobile operation, vehicle's bat-
tery is exhausted.
e Volume level is too low.
e The squelch is closed.
e An external speaker or headphones
are connected.
e CW narrow mode is selected without
an optional FL-52A or FL-53A CW
NARROW FILTER.
e FM mode is selected without an op-
tional UI-9 FM UNIT.
e The antenna is not connected pro-
perly.
e The coaxial cable is cut or shorted.
e An antenna not suitable for the oper-
ating frequency is connected.
e An antenna is not properly tuned
when using an optional AH-3 HF AU-
TOMATIC ANTENNA TUNER.
e The attenuator is activated.
e The preamp is cancelled.
e The noise blanker is ON.
e The preamp is ON.
If you cannot solve a problem, contact your nearest
icom Dealer or Service Center.
blown fuse with a new one.
e Charge the vehicle's battery.
e Push the [LOCK] switch to cancel the
dial lock function.
obtain a suitable listening level.
e Rotate the [SQL] control counter-
clockwise to open the squelch.
e Disconnect the external speaker or
headphone plug.
e Install the FL-52A or FL-53A, if re-
quired.
e Install the UI-9, if required.
e Reconnect the antenna connector.
e Check the coaxial cable and correct
any improper conditions.
e Connect an antenna suitable for the
operating frequency.
e Push and hold the [TUNE] switch until
"TUNE" blinks to re-tune the antenna.
ePush the [PREAMP/ATT] switch 1
time to cancel the attenuator.
e Push the [PREAMP/ATT] switch 1
time to activate the preamplifier, if
required.
e Push the [NB] switch to cancel the
noise blanker.
e Push the [PREAMP/ATT] switch 2
times to cancel the preamp.