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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.
FGB 4 A
PA unit
■
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
DC POWER CABLE FUSE REPLACEMENT
20 A
fuse
■
Resetting the CPU
Returns programmed values in both
quick and ini-
tial 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 [UP
Y
] and [
Z
DN], push [PWR] to
turn power ON.
• The internal CPU is reset.
[PWR]
[
√
] [
∫
]
8
MAINTENANCE