Troubleshooting Guide - Interphase Twinscope Operation Manual

Troubleshooting Guide

If you are experiencing trouble with your Twinscope, please refer to the following checklist:
PROBLEM
Unit will not turn on.
Unit beeps but no picture appears
on the screen.
Unit blows fuses.
Loses picture at speed.
LCD darkens in sunlight after
prolonged use.
Screen is full of noise, or has dots
running through it.
Bottom slopes up/down
Speed display is erratic.
Digital water depth not working.
SOLUTION
Check fuse, battery voltage and power connections.
Also, check for continuity through the in-line fuse holder.
Check your connections to the battery. Check for
corrosion on the battery terminals or on the wiring
connections on a fuse block or buss bar.
Wiring is reversed or there is excessive current from the
battery. The red wire should be "+" (positive) and have
continuity with pin #1 on the female side of the power
supply lead.
Adjust the transducer angle or placement. Make sure that
the transducer is installed in the area which has the least
amount of water turbulence.
Overexposed to sunlight - provide shading for display.
Reduce your SENS setting and review the section on
interference. (see next page)
Adjust the transducer LEVEL adjustment in SETUP view.
Check and clean the impeller wheel and the surrounding
area - be sure the impeller wheel spins freely.
Increase your SENS, and check that you are in the proper
depth range.
80