ICOM IC-756PRO2 Manuale Utente

78

11

MAINTENANCE

■

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.

DISCONNECT the DC power cable

from the transceiver when changing a fuse.

The IC-756PROII has 2 types of fuses installed for
transceiver protection.
• DC power cable fuses ................................ FGB 30 A
• Circuitry fuse ................................................ FGB 5 A

30 A 
fuse

■

The transceiver has a lithium backup battery
(CR2032) inside for clock and timer functions. The
usual life of the backup battery is approximately 2
years.

When the backup battery is exhausted, the trans-
ceiver transmits and receives normally but cannot re-
tain the current time.

See p. 80 for battery location.

CR2032

CIRCUITRY FUSE REPLACEMENT
The 13.8 V DC from the DC power cable is applied to
all units in the IC-756PROII, except for the power am-
plifier, through the circuitry fuse. This fuse is installed
in the PA unit.

q

Remove the top cover as shown on p. 76.

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.

Circuitry fuse (FGB 5 A)

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/SPEECH] to turn the function OFF.
• Push [EXIT/SET] several times to exit the set

mode screen.

• Reset the CPU.

p. 6
pgs. 11,

65

p. 21