Troubleshooting - Furuno CH-300 Operator's Manual

6. MAINTENANCE, TROUBLESHOOTING
6.6

Troubleshooting

The table below provides common symptoms of equipment troubles and the means to
rectify them.
Symptom
Cannot turn on the
power.
Bottom echo
becomes irregular.
Weak echo
Somewhat strange
color
Picture contains
noise.
Picture does not
change when tilt
angle is changed.
(Bottom is not
displayed in vertical
scan picture when
bottom is flat.)
6-4
• Check cable between transceiver unit and monitor unit.
• Check ship's mains.
• Have a suitably qualified technician check the fuse in the
transceiver unit.
• Rough seas. Distance to the bottom changes due to rolling and
pitching.
• Long range selected. Transmission period is longer so ship's
pitching and rolling are apt to affect detection of echo.
• Output power set to minimum. Set to maximum, on the COM1
menu.
• Excessive TVG. Readjust TVG on the appropriate menu (HORZ,
VERT, ES). Note that readjustment of TVG is necessary when gain
is adjusted.
• Brilliance setting too low. Increase brightness with BRILL key
(supplied monitor) or brilliance control on commercial monitor.
• Equipment not grounded properly. Check equipment ground.
• Power cable is too close to the signal cable. Relocate power cable
or signal cable.
• Debris may be on sea surface. Reject unwanted noise with the
interference rejector on the COM1 menu.
• Problem in tilt mechanism or control line. Contact a FURUNO agent
or dealer for advice.
Check, Remedy