Appendix B - Troubleshooting - NorthStar NS 3100 User Manual

Appendix B - Troubleshooting

Reference Manual and Installation Manual
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 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.
3 The word SIMULATE flashes at top, left of screen,
values displayed are unexpected:
a Unit is in simulate mode (see section 2-4).
4 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.
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