Troubleshooting - Furuno CH-500 Operator's Manual

6.6

Troubleshooting

The following table lists common symptoms of equipment trouble and possible means
to rectify them.
Symptom
Cannot turn the power on.
Cannot turn the power off.
Seabed echo becomes ir-
regular.
Weak echoes.
Screen color appears
strange.
Picture contains noise.
Picture does not change
when the tilt angle is adjust-
ed. (Seabed does not ap-
pear in the vertical scan
when the seabed is flat.)
Water leakage from the hull
unit's shaft flange.
6. MAINTENANCE, TROUBLESHOOTING
Checks and remedies
• Check the cable between the transceiver unit and the
display unit. Re-connect or fasten as appropriate.
• Check that the transceiver is turned on.
• Check the ship's mains.
• Have a qualified technician check the fuses.
• Make sure the power button makes a "click" sound
when you press it. If the power button is not pressed
sufficiently, the power will not turn on.
• Check the cable between the transceiver unit and the
display unit. Re-connect or fasten as appropriate.
• Check that the control unit used to turn the power off is
the same as the one used to turn the power on.
• Make sure the power button makes a "click" sound
when you press it. If the power button is not pressed
sufficiently, the power will not turn off.
• Rough seas. The distance to the seabed changes dra-
matically due to pitching and/or rolling.
• Long range selected. Transmission period is long,
which causes pitching/rolling to affect echo detection.
• Output power is set to [Low]. Change the output power
to [High] from the [COM1] menu.
• TVG setting is excessively high. Adjust the TVG setting
from the appropriate display mode menu. Also note
that TVG requires readjustment when the gain setting
is changed.
• The brilliance setting may be too low. Adjust the bril-
liance referring to section 1.4.
• The equipment may not be grounded correctly. Check
the ground (earth) for the equipment.
• Power cable is too close to the signal cable. Relocate
the power cable or the signal cable.
• Debris may be on the sea surface. Turn the [Interfer-
ence] on from the [COM1] menu.
• There may be a problem with the tilt mechanism or the
tilt control line. Contact your local dealer for advice.
• Wipe the area dry, then check the area around the gas-
ket retaining plate. If water is leaking from the retaining
plate, tighten the bolts.
• If water still leaks after the above checks and reme-
dies, the gasket may require replacement. Contact
your local dealer and request service/replacement.
See section 6.3.1 for part details.
Note: When the hull unit no longer leaks, check that the
main shaft can move freely and adjust as necessary.
6-5