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NAVMAN 8120/8084 Installation and Operation Manual 105
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.
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 NAVMAN 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
Repairs to the product may only be carried
out by a service centre approved by
NAVMAN. 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.navman.com.
e Check power wiring (see section 18-4).
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.
105


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