Furuno NX-700B - 7.7 Troubleshooting Guide

7.7 Troubleshooting
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7.7 Troubleshooting
1. The power is not turned on.
The power is not turned on.
The problem may be caused by the failure
of the CPU board.
Replace the fuse (F401: 2A).
If the fuse is blown out immediately after the
p
ower is turned on, check the diode for
p
rotection against reverse connection (CR401)
on the RCV board for damage.
Check the power fuse of the RCV board.
OK?
The over voltage protection circuit or
low voltage protection circuit is activated.
Supply the power of the rated voltage.
Is the input power supplied at the rated
voltage of +11 VDC to +31VDC?
No
Yes
Yes
No