Appendix B - Troubleshooting - Navman FISH 450 Tricolor 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 unit back to the
manufacturer for repair. Please follow this
troubleshooting section before contacting the
nearest NAVMAN dealer.
There are no user serviceable parts. Specialised
methods and testing equipment is required to
ensure that the unit is reassembled correctly and
is waterproof. Users who service the FISH450
Tricolor themselves will void the warranty (see
appendix D.
Repairs to the FISH450 Tricolor may only be
carried out by a service centre approved by Talon
Technology. If it is found that the unit 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.
1. The fishfinder won't turn on:
a) The FISH450 Tricolor is designed to operate
on 12 volt battery systems, where the voltage
may vary from 10 to 16.5 volts. If an excessive
voltage is supplied to the unit, a resettable fuse
will be tripped, turning the unit off.
b) Check the power cable connector at the back
of the unit is securely plugged in and the collar
is locked in place. The collar must be secure
for water tight connection.
c) Measure the battery voltage. If the voltage is
less than 10 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 or squashed
sections.
e) Make certain the power cable's red wire connects
to the positive battery terminal and the black wire
to the negative battery terminal or ground. (If
wired for Auto Power, then ensure the red and
yellow wires are connected to the boat's power
switch. Also check the boat's power switch circuit.
See Auto Power section 5-8.)
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. Test the fuse or replace
NAVMAN
FISH450 Tricolor FISHFINDER Installation and Operation Manual
it with a fuse known to be good.
2. The fishfinder operates erratically:
a) Check the Aquaducer does not have debris (eg
weed, plastic bag etc.) caught around it.
b) The Aquaducer may have been damaged during
launching, running aground or while underway
with debris etc. If the Aquaducer has been
impacted, it may have been kicked up on the
bracket. If it has not been physically damaged,
push it back down so it 'clicks' into place.
c) When in water less than 2 feet (0.6m) the bottom
and depth readings may become inconsistent and
erratic. This depth is measured from the transducer
and does not allow for any Keel Offset setting.
d) Manual Gain may be set too low, which may cause
weak bottom echo, or no fish signals. If you have
the Auto Gain disabled try increasing the gain.
e) Ensure the bottom surface of the Aquaducer is
angled approximately 5° forward and as low as
possible in order to minimise the generation of
bubbles through cavitation. See Mounting the
Aquaducer section 5-3.
f) Check the transducer and power cable
connectors at the back of the unit are securely
plugged in and the collar is locked in place. The
collar must be secure for water tight connection.
g) Inspect the transducer and power cables from
end to end for damage such as cuts, breaks or
squashed sections.
h) Ensure there is not another fishfinder or depth
sounder turned on, which may interfere with the
FISH450 Tricolor.
i) Electrical noise from the boat's engine or an
accessory may be interfering with the transducer(s)
and/or the FISH450 Tricolor. This may cause the
unit to automatically decrease the gain unless using
Manual Gain. The unit thus eliminates weaker
signals such as fish or even the bottom from the
display. This may be checked by switching off other
instruments, accessories (e.g. fridges) and the
motor until the offending device is located. To stop
problems from electrical noise, try:
- Rerouting the power and transducer
cable(s) away from the boat's other
electrical wiring.
- routing the unit's power cable directly to the
battery instead of through a fuse block or
ignition switch.
3. Bottom is not displayed:
a) If in Manual Range and the depth reading is
displayed, check that the depth is not greater
than the range selected. (see section 3-2)
b) The depth may be outside the fishfinder's range.
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