Appendix B - Troubleshooting; General Problems - NorthStar Multi-Function Unit M121 Installation And Operation Manual

Appendix B - Troubleshooting

This troubleshooting guide is written with
the assumption that the user has read and
understood the relevant sections in this manual.
It is possible in many cases to solve difficulties
without having to send the display 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 display unit is reassembled
correctly and is waterproof. Users who service
the product themselves will void the warranty.
B-1 General problems
1-1 The Instrument won't turn on:
a The Instrument is designed to operate
on a 12/24 volt battery system, where the
voltage may vary from 10.5 to 32 volts. If an
excessive voltage is supplied, a fuse will be
tripped, turning the display unit off. Check
the fuse.
b Check that the power cable connector at the
back of the display unit is securely plugged
in and the collar is locked in place. The collar
must be secure for watertight connection.
c Measure the battery voltage while the
battery is under load - turn on some
lights, radio or other electrical equipment
connected to the battery. If the voltage is
less than 12 volts:
- the battery terminals or wiring on the
terminals may be corroded.
- the battery may not be charging
correctly or may need replacing.
d Inspect the power cable from end to end
for damage such as cuts, breaks, squashed
or trapped sections.
e Check power wiring (see section 18-4).
Northstar M121/M84 Installation and Operation Manual
Repairs to the product may only be carried out
by a service centre approved by Northstar. If the
product must be sent into a service centre for
repair, it is essential to send in the transducer(s)
at the same time.
More information can be found on our Website:
www.northstarnav.com.
f Check for corrosion on the power cable
connector and clean or replace if required.
g Check fuses that are placed in line with the
power cable. A fuse can be blown despite
appearing to be good or the fuse may be
corroded. Test the fuse or replace it with a
fuse known to be good.
1-2 The Instrument won't turn off:
The Instrument may have been wired for
Auto power. In this case, the Instrument
cannot be turned off while the ignition
power is on (see section 2-2).
1-3 If the Instrument beeps when turned
on but nothing is displayed:
The Instrument may be operating, but the
backlight settings may have been set too
low (see section 2-3).
1-4 The wrong language is displayed:
See section 19-1.
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