Furuno FR-7252, FR-7112, FR-7062 manual Troubleshooting

5.3 Troubleshooting

Table 5-2 contains simple troubleshooting pro- cedures which you can follow to try to restore normal operation. If you cannot restore normal operation, do not attempt to check inside any unit of the radar system. Any repair work is best left to a qualified technician.

Table 5-2 Troubleshooting table

If...	But...	Then...
you pressed the	the control panel does	• try adjusting the control panel back-
[POWER] key to turn	not light	lighting on the OTHERS menu.
on the radar		• battery may have discharged.
		• check fuse in power cable.
	nothing appears on	• try adjusting the brilliance.
	the display or display
	contrast is poor
	characters are	• request service.
	distorted
the radar has	the scanner does not	• the problem may be in scanner unit.
warmed up and you	rotate	Request service.
pressed the
	characters and	• have a qualified technician check the
[STBY TX] key to
transmit	indications are	set.
	abnormal
you have adjusted	neither noise nor	• check signal cable for damage.
the gain with A/C	targets appear
RAIN and A/C SEA	(indications and
off	markers do)
	neither indications nor	• check signal cable for damage.
	markers appear (noise
	and targets do)
	the sweep (radial line	• the problem may be in the scanner
	sweeping around the	unit. Request service.
	display) is not
	synchronized with
	scanner rotation
	there is no change in	• request service.
	sensitivity
a key is pressed	nothing happens	• key may be faulty. Request service.

5-2