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11. MAINTENANCE, TROUBLESHOOTING
11-4
11.4 Troubleshooting
The table below provides common symptoms of equipment troubles and the
means to rectify them.
Troubleshooting
Symptom Check, Remedy
Cannot turn on
the power.
• Check cables between transceiver unit, processor unit and
monitor unit.
• Check ship’s mains.
• Have a suitably qualified technician check the fuse in the
transceiver unit.
Bottom echo
becomes
irregular.
• 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.
Weak echo
• Output power set to minimum. Set to maximum, on the
H-SCAN SETTING menu.
• Excessive TVG. Readjust TVG on the appropriate menu
(H-SCAN SETTING, V-SCAN SETTING). Note that
readjustment of TVG is necessary when gain is adjusted.
Somewhat
strange color
• Brilliance setting too low. Increase brightness with the
[BRILLIANCE] control.
Picture contains
noise.
• 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 appropriate menu among
H-SCAN SETTING, V-SCAN SETTING.