I have a 917c mounted in the bow of my Ranger bassboat. The transducer is enclosed in the bottom of the MK 101 trolling motor. About a month ago I turned on the unit and a verticle black line about 3/4" thick appeared on the screen. About a week later a second verticle black line just to the left of the first appeared and the next week a thrid black line appeared just to the left of the second. I now have three verticle black lines, each about 3/4" thick. I ran a diagonostics check and everything came-up OK.
Any ideas?
Thanks,
BassinBill
Chapin, SC