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

8

MAINTENANCE

n Fuse replacement
If a fuse blows or the transceiver stops functioning,
try to find the source of the problem, and replace the
damaged 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 transceiv-
er 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.
n Resetting the CPU
[PWR]
Returns programmed values in both quick and initial
set mode to their defaults.
40
[DN Z] [Y UP]
DC POWER CABLE FUSE REPLACEMENT
20 A
fuse
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 [Z DN] and [UP Y], push [PWR] to
turn power ON.
• The internal CPU is reset.
FGB 4 A
PA unit