Furuno CH-250 - Manual (Page 106)

6-4
6.6 Troubleshooting
The table below provides common symptoms of equipment troubles and the means to rectify
them.
Symptom Check, Remedy
Cannot turn on the
power. • Check cable between transceiver unit and display 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 COM1 menu.
• Excessive TVG. Readjust TVG on the appropriate menu (HORZ, VERT,
ES). Note that readjustment of TVG is necessary when gain is adjusted.
Somewhat strange
color •
[BRILL] key setting too low. Increase brightness with [BRILL] key.
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 COM
1 menu.
Picture does not
change when tilt angle
is changed. (Bottom is
not displayed in vertical
fan picture when
bottom is flat.) • Problem in tilt mechanism or control line. Contact a FURUNO agent or
dealer for advice.