Troubleshooting; The Power Is Not Turned On - Furuno NX-700B Service Manual

7.7 Troubleshooting

1. The power is not turned on.

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