Furuno FSV85MK2 Manual page 173

Symptom
Picture contains noise
Alarm releases no audio
Check, remedy
• Equipment not grounded properly. Check equip-
ment ground.
• Power cable is too close to the signal cable. Relo-
cate power cable or signal cable.
• Debris may be on sea surface. Reject unwanted
noise with the interference rejector on the [4 Pic-
ture Setting] menu or gain offset on the [3 Display
Setting] menu.
• If settings at main menu  [9 Installation Setting]
 [OK]  [1 Display Setting]  [2 Echo Display
Area] are changed, on rare occasions the alarm is
also silenced. Re-set the alarm parameters in this
case.
9. MAINTENANCE
9-9