Maintenance; Fuse Replacement; Resetting The Cpu - Icom IC-746 Instruction Manual

14-1 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.
v CAUTION:
DISCONNECT the DC power cable
from the transceiver when changing a fuse.
The IC-746 has 2 types of fuses installed for trans-
ceiver protection.
• DC power cable fuses .............................. FGB 20 A
• Circuitry fuse .............................................. FGB 5 A
CIRCUITRY FUSE REPLACEMENT
The 13.8 V DC from the DC power cable is applied to
all units in the IC-746, except for the power amplifier,
through the circuitry fuse. This fuse is installed in the
PA unit.
Remove the top cover and PA shielding plate as
shown on p. 76
Replace the circuitry fuse as shown in the diagram
at right.
Replace the PA shielding plate and top cover.

14-2 Resetting the CPU

NOTE: Resetting CLEARS all programmed con-
tents in memory channels and returns programmed
values in set mode to their defaults.
[POWER]
When first applying power or when the function seems
to be displaying erroneous information, reset the CPU
as follows:
[F-INP] [M-CL]

MAINTENANCE

DC POWER CABLE FUSE REPLACEMENT
Fuse
Make sure transceiver power is OFF.
While pushing [F-INP] and [M-CL], push [POWER]
to turn power ON.
• The internal CPU is reset.
• The transceiver displays its initial VFO frequencies when
resetting is complete.
14
30 A fuse
81