Icom IC-77 Instruction Manual page 21

¢The [RF PWR] control
counterclockwise.
e The [MIC] control is set too far coun-
terclockwise.
e The antenna is not connected
properly.
e The coaxial cable is cut or shorted.
e An antenna not suitable for the oper-
ating frequency is connected.
eThe antenna is not properly tuned
when using an optional AT-130 HF
AUTOMATIC ANTENNA TUNER.
"| Transmitted signals are dis-
Mee eThe [MIC] control is set too far
>>| torted.
clockwise.
¢The lock function is activated. e Push the [LOCK] switch to cancel the
lock function.
E Channel scan does not'start. | eSquelch is open.
| When a signal is received, | ° Scan resume condition is OFF.
the channel scan is can-
celled.
E Fuse replacement
If a fuse blows, check for the cause, then replace the
blown fuse in the DC power cable with a new one.
eDC power cable fuses: FGB 20 A
If the power does not come ON even after fuse replace-
ment, the internal fuse may be blown. Ask your Icom
Dealer for internal fuse replacement. :
elnternal fuse: FGB 4A
CAUTION: DISCONNECT the DC power cable
from the DC power supply or battery when chang-
ing the fuse.
E CPU backup battery
The IC-77 has a lithium backup battery for retaining
channel information. When this battery is exhausted,
channels are erased. The usual life of the battery is
more than 5 years.
Ask your Icom Dealer or Service Center for backup bat-
tery replacement and re-programming.
is set too far
DC power cable fuse replacement
e Rotate the [RF PWR] control
clockwise.
e Rotate the [MIC] control to a suitable
position.
e Reconnect the antenna connector.
eCheck the coaxial cable and correct
any improper conditions.
e Connect an antenna suitable for the
operating frequency.
e Push the [TUNE] switch to retune the
antenna.
e Rotate the [MIC] control to a suitable | p. 10
position.
e Rotate the [SQL] control to the
threshold point.
e Ask your Icom Dealer to program scan
resume condition ON. -
a
C&D FGB 20 A
18