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

7
MAINTENANCE
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Fuse replacement

If a fuse blows, and the transceiver stops functioning,
find the source of the problem, and repair it.
Then replace the damaged fuse with a new, adequately
rated fuse.
CAUTION:
Turn the power OFF and disconnect
the DC power cable from the transceiver before re-
moving the transceiver's cover.
The IC-78 has 2 types of fuses installed for transceiv-
er protection.
• DC power cable fuses ........................ ATQ 25 A
• Circuitry fuse .................................... FGB 4 A
CIRCUITRY FUSE REPLACEMENT
The 13.8 V DC from the DC power source is applied
to all units in the IC-78 through the circuitry fuse. This
fuse is in the PA unit.
q Remove the top cover as shown on
w Replace the circuitry fuse as shown in the diagram
to the right.
e Replace the top cover.
n

Resetting the CPU

[PWR]
Returns programmed values in both the Quick and
Initial Set modes to their defaults.
39
page 47.
[� DN] [UP �]
DC POWER CABLE FUSE REPLACEMENT
25 A fuse
When applying power for the first time after purchase,
or if the functions seem to be displaying erroneous in-
formation, reset the CPU as follows:
q Make sure transceiver power is OFF.
w While pushing [UP p] and [q DN], push [PWR] to
turn power ON.
• The internal CPU is reset.
FGB 4 A
PA unit