Fuse Replacement; Resetting The Cpu - Icom IC-78 Instruction Manual

8
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-78 has 2 types of fuses installed for transceiver
protection.
• DC power cable fuses ................................ FGB 20 A
• Circuitry fuse ................................................ FGB 4 A
CIRCUITRY FUSE REPLACEMENT
The 13.8 V DC from the DC power cable is applied to
all units in the IC-78 through the circuitry fuse. This
fuse is installed in the MAIN unit.
q Remove the top cover as shown on p. 48
w Replace the circuitry fuse as shown in the diagram
at right.
e Replace the top cover.

Resetting the CPU

[PWR]
Returns programmed values in both quick and ini-
tial set mode to their defaults.
40
When first applying power or when the function seems
to be displaying erroneous information, reset the CPU
as follows:
q Make sure transceiver power is OFF.
w While pushing [UP Y] and [Z DN], push [PWR] to
[√] [∫]
DC POWER CABLE FUSE REPLACEMENT
20 A
fuse
PA unit
turn power ON.
• The internal CPU is reset.
FGB 4 A