Appendix B - Troubleshooting - NorthStar NS3100 Multi Instrument Reference Manual

Appendix B - Troubleshooting

24
This troubleshooting guide assumes that you have
read and understood this manual.
It is possible in many cases to solve difficulties
without having to send the unit back to the
manufacturer for repair. Please follow this
troubleshooting section before contacting the
nearest Northstar dealer.
There are no user serviceable parts. Specialized
methods and testing equipment are required to
ensure that the unit is reassembled correctly and is
waterproof. Repairs to the unit must only be carried
out by a service centre approved by Northstar.
Users who service the unit themselves will void the
warranty.
More information can be found on our Website:
www.NorthstarNav.com
1 Unit will not turn on:
a Fuse blown or circuit breaker tripped.
b Battery voltage is outside the range 10.5 to
16.5 V DC.
c Power/data cable damaged.
2 Speed reading wrong or erratic:
a Calibration is incorrect (see section 3-7).
b Speed transducer cable unplugged or
damaged.
c Speed/temperature transducer fouled or
damaged. Check paddle wheel is aligned fore
and aft in the fitting. Remove paddlewheel
from fitting, check for fouling or damage.
Spin paddlewheel by hand, check for a speed
reading.
d Speed transducer installed incorrectly or
transducer does not have a smooth flow of
clear water over it. Review installation.
e Interference from electrical noise. Review
installation.
3 Depth reading wrong or erratic:
a Unit temporarily unable to detect bottom, for
example water too deep or too shallow, water
not clear, boat reversing and transducer in
turbulent water.
b Depth transducer cable unplugged or
damaged.
c Depth transducer fouled or damaged. Check
for fouling, damage or too thick a layer of paint
over it.
d Depth transducer installed incorrectly or
transducer does not have a smooth flow of
clear water over it. Review installation.
e Interference from the ultrasound pulse from
another depth sounder.
f Interference from electrical noise. Review
installation.
To check the transducer, disconnect it and connect
a known good transducer temporarily. Hold it
over the side of the boat in the water and check if
the unit displays a depth.
4 Temperature reading wrong:
a Calibration is incorrect (see section 6-2).
b Speed/temperature transducer cable damaged.
5 The word SIM flashes at bottom, right of screen,
values displayed are unexpected:
a Unit is in simulate mode (see section 2-5).
6 The display fogs:
a Moist air has entered the breathing tube at the
rear of the unit. Air the boat or run unit with
backlight fully on.
b Water has entered the breathing tube. Return
unit for service.
Northstar NS3100 MULTI