Icom IC-725 Instruction Manual page 28

MAINTENANCE AND ADJUSTMENT 8
8-6 TROUBLESHOOTING If you are not able to locate the cause of a problem or solve
it through the use of this chart, contact your nearest Icom
The following chart is designed to help you correct pro- Service Center or Dealer.
blems which are not equipment malfunctions.
PROBLEM POSSIBLE CAUSE SOLUTION
ө Ромег does not come on | @Power cable is improperly connected. • Reconnect the power cable securely.
when the [POWER] switch
is pushed.
• Fuse is blown. • Check for the cause, then replace the fuse with p. 25
(Fuses are installed in two places. One is a spare one.
installed in the DC power cable and the DC power cable
other is installed in the PA unit. See p. 25 PA UNIT
for their locations.)
• Battery is exhausted. • Check the battery voltage with the transceiver
turaed ON.
ө Мо sound comes from the | ө Volume level is too low.
speaker.
e Rotate the [AF] contro! clockwise to obtain a
suitable listening level.
e The squelch is closed. e Rotate the [SOL] control counterclockwise to
open the squelch.
ePush the [TRANSMIT] switch to the out
position to return to receive mode.
ө The transceiver is in transmit mode.
ө An external speaker or headphones are in
use.
€ Check the external speaker or headphones plug
connection.
• The transceiver is in FM mode. • Operating in FM mode requires an optional
Ul-7 AM • FM UNIT.
* Operating CW narrow mode requires either the
FL-100 or FL-101 (sold separately).
9 The transceiver is in CW narrow mode.
€ Sensitivity is low. • Check the feediine and correct any improper
• The antenna feedline is cut or shorted.
' conditions.
€ Attenuator circuit is inserted in the RF
circuit.
• Push the [ATT] switch to the out position to
disconnect the circuit.
9 Antenna is not properly tuned when • Push the [TUNE] switch to tune the antenna.
using the AH-3.
è Receive signal is distorted | € The noise blanker function is turned ON.
with strong signals.
* Output power is low.
*Push the [NB] switch to the out position to
turn OFF the function.
• Output power is set at low. eRotate the [RF PWR] control clockwise.
Clockwise rotation increases the power.
* Mic gain is set at low. • Нотате the [MIC] control clockwise. Clock-
wise rotation increases the mic gain.
€ The antenna feedline is cut or shorted. • Check the feedline and correct any improper
conditions.
• Operating mode is set to AM. • The transceiver outputs 40 W maximum in AM.
• Transmitted signals * The mic gain is set too high. e Rotate the [MIC] control counterclockwise to
distorted. reduce the gain.
e The displayed frequency | € The dial lock function is activated. • Ризћ the [LOCK] switch to the out position | p. 2
does not change properly. to release the function.
e The internal CPU has malfunctioned. * Turn the power OFF. Then turn the power | p. 25
ON again while pushing the [FUNC] and [MW]
switches.
e Scan does not operate. e Squelch is open. ө Set the squelch threshold point. p. 15
9 Both scan edges are set improperly for | € Reset scan edges. p. 23
Programmed scan.
ө Frequencies are not memorized in me- | € Program frequencies into memory channels. p. 22
mory channels for Memory scan.
9 All programmed memories | € The backup battery is empty. • Replace the backup battery.
have been erased.
€ АП memory channels аге | € The [LOCK] switch is pushed IN. • Push the [LOCK] switch OUT.
not displayed.
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