40
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 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
DC POWER CABLE FUSE REPLACEMENT
n Resetting the CPU
Returns programmed values in both quick and initial
set mode to their defaults.
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.
8
MAINTENANCE
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