Icom IC-28A Instruction Manual page 24

(See page 20)
HM-15
SCAN
SIT CH SWITCH
5-8
BACKUP BATTERY
RESETTING INTERNAL
MICROCOMPUTER (CPU)
In the MEMORY mode, the switches change the selected memory
channel one channel at a time. Holding either switch down starts
the memory channel scan (SECTION 5 - 3 MEMORY CHANNEL
SCANNING).
SCAN SWITCH:
e OFF: The UP SWITCH and DN SWITCH on the microphone are
disabled to eliminate the chance of accidental frequency or
memory channel changes.
eON: The SCAN SWITCH must be ON for the UP SWITCH and
DN SWITCH to function as described above.
The IC-28A/E contains a lithium battery as a backup for the internal
microcomputer memory in the transceiver for times when the
external power source is removed or interrupted. The lithium bat-
tery is a reliable backup device which has been proven to last for
more than five years under actual operating conditions.
After using the IC-28A/E for five years, monitor the transceiver
operation carefully and replace the battery if there are repeated
cases of display malfunction.
Occasionally, the LCD READOUT may display erroneous informa-
tion either during operation or when first applying power. This may,
for example, be caused by an external cause such as static electricity.
1) Turn ON the power to the IC-28A/E.
2) Locate the RESET HOLE in the bottom cover of the transceiver.
С TRANSMIT db TRANSMIT