This troubleshooting guide is writ ten with
the assumption that the user has read and
understood the relevant section s in this
manual.
It is possible in many cases to solve diff iculties
without having to send the display unit back to
the manufacturer for repair. Please fol low this
troubleshooting section before contacting the
nearest Navman dealer.
There are no user serviceable pa rts. Specializ ed
methods and testing equipment are requ ired
to ensure that the display unit is reassemble d
correctly and is waterproof. Users who se rvice
the product themselves will void the wa rranty.
Repairs to the product may only be car ried out
by a service centre approved by Navman. If the
product must be sent into a service cent re for
repair, it is essential to send in the transduce r(s)
at the same time.
More information can be found on our Websi te:
www.navman.com.
1. The fishfinder won’t turn on :
a) The FISH 4432/4433 is designed to operate
on a 12 volt battery system, where the
voltage may vary from 10 to 16 volts. If an
excessive voltage is supplied, the unit wi ll
turn off/not start.
b) Ch eck that the power cable co nnector
at the back of the display unit is securely
plugged in and the collar is locked in pla ce.
Appendix C - TroubleshootingThe collar must be secure for watertigh t
connection.
c) Measure the battery volta ge while the
battery is under load - turn on som e
lights, radio or other electri cal equipment
connected to the battery. If the voltage i s
less than 10 volts:
- the battery terminals or wiring on th e
terminals may be corroded.
- the battery may not be charging
correctly or may need replacing.
d) I nspect the power ca ble from end to end
for damage such as cuts, breaks, sq uashed
or trapped sections.
e) Ensure that the red wire is connected to the
positive battery terminal and the bl ack wire
to the negative battery terminal. If w ired for
the Auto Power option, ensure the yellow
wire is connected to the ignition circuit.
Also check the boat’s main switch circui t
(see section 6-5 Wiring optio ns).
f) Check for corro sion on the power cabl e
connector and clean or replace if requi red.
g) C heck fuses that are pla ced in line with the
power cable. A fuse can be blown desp ite
appearing to be good or the fuse may be
corroded. Test the fuse or replace it with a
fuse known to be good.
Appendix B - DimensionsFISH 4432/4433 Installation and Operation Manual35 NAVMAN