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CIRCUITRY FUSE REPLACEMENT
The 13.8 V DC from the DC power cable is applied to
all units in the IC-756, except for the power amplifier,
through the circuitry fuse. This fuse is installed in the
PA unit.
q Remove the top cover as shown on p. 61.
w Remove 11 screws from the PA shielding plate,
then remove the plate.
e Replace the circuitry fuse as shown in the diagram
below.
r Replace the PA shielding plate and top cover.
64
10
MAINTENANCE
■ Fuse replacement
If a fuse blows or the transceiver stops functioning, try
to find the source of the problem, and replace the dam-
aged fuse with a new, rated fuse.
CAUTION: Disconnect the DC power cable from
the transceiver when changing a fuse.
The IC-756 has 2 types of fuses installed for trans-
ceiver protection.
•DC power cable fuses ............................... FGB 20 A
•Circuitry fuse ............................................... FGB 5 A
DC POWER CABLE FUSE REPLACEMENT
Circuitry fuse (FGB 5 A)
20A fuse
The transceiver has a lithium backup battery on the
inside of the front panel for clock and timer functions.
The usual life of the backup battery is approximately 5
years.
When the backup battery is exhausted, the trans-
ceiver transmits and receives normally but cannot re-
tain the current time.
■ Clock backup battery replacement
PROBLEM POSSIBLE CAUSE SOLUTION REF.
DISPLAY
The displayed frequency
does not change properly.
•The dial lock function is activated.
•A set mode screen is selected.
•The internal CPU has malfunctioned.
•Push [LOCK] to deactivate the function.
•Push [
(F-5)EXIT] one or more times to exit the
set mode screen.
•Reset the CPU.
p. 5
pgs.
10, 53
p. 21