How To Replace The Fuse; How To Clear The Memory; How To Reset The Microprocessor - Furuno FM-4721 Operator's Manual

7.3

How to Replace the Fuse

If the power cannot be turned on, the fuse may have blown. To take out the fuse from
the fuse holder on the power cable, hold both ends of the fuse holder and pull the fuse
holder apart without bending the fuse holder. When you replace the fuse, confirm that
the fuse is tightly fixed on the metal contact located inside the fuse holder. If the metal
contact holding the fuse is loose, the fuse holder may become hot.
7.4

How to Clear the Memory

To clear the scan memory and preset memory:
1. Turn the radio off.
2. Press and hold down the three soft keys then turn on the radio.
7.5

How to Reset the Microprocessor

To clear all memories and other settings to factory defaults (except the Channel
Group, MMSI number, Individual Directory and Group Directory), follow the procedure
shown below. The display shows "EE-PROM Resetting" while the resetting is being
done.
1. Turn the radio off.
2. Press and hold the 16/9, CALL/MENU, and CLR/WX keys then turn on the radio.
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WARNING
Use the proper fuse.
Use of a wrong fuse can result in damage
to the equipment and cause fire.
7. MAINTENANCE, TROUBLESHOOTING
7-3