Navman FISH 4500/4600 - Manual (Page 34)

This troubleshooting guide is written with the as-
sumption 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 cor-
rectly and is waterproof. Users who service the
product themselves will void the warranty.
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.
1. The fishfinder won’t turn on:
a) The FISH 4500/4600 is designed to operate
on a 12/24 volt battery system, where the
voltage may vary from 10 to 35 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 10 volts:
-
the battery terminals or wiring on the
terminals may be corroded.
- the battery may not be charging cor-
rectly or may need replacing.
d) Inspect the power cable from end to end
for damage such as cuts, breaks, squashed
or trapped sections.
e) Ensure that the red wire is connected to the
positive battery terminal and the black wire
to the negative battery terminal. If wired for
the Auto Power option, ensure the yellow wire
is connected to the ignition circuit. Also check
the boat’s main switch circuit (see section 6-5
Wiring options).
Appendix C - Troubleshooting
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 cor-
roded. Test the fuse or replace it with a fuse
known to be good.
2. The fishfinder won’t turn off:
The fishfinder may have been wired for Auto
power. In this case, the fishfinder cannot be
turned off while the ignition power is on. (See
Auto power wiring in section 6-5 Wiring op-
tions.)
3. The fishfinder operates erratically:
a) Check that the transducer does not have de-
bris (e.g. weed, plastic bag) caught around
it.
b) The transducer may have been damaged
during launching, running aground or while
underway with debris etc. If the transducer has
been impacted, it may have been kicked up
on the bracket. If it is not physically damaged,
reset the transducer back to its original posi-
tion. (See the Transom Transducer Installation
Guide.)
c) When the transducer is less that 2 ft. (0.6 m)
from the bottom, the depth readings may
become inconsistent and erratic.
d) Manual Gain may be set too low, which may
cause weak bottom echo or no fish signals. If
in Manual Gain, try increasing the Gain.
e) Ensure the back of the bottom surface of the
transducer is slightly lower than the front and
the front is as deep in the water as possible
in order to minimize the generation of bub-
bles through cavitation. (See the Transom
Transducers Installation Guide.)
f) Check the transducer and power cable
connectors at the back of the display unit
are securely plugged in and the collars are
locked in place. The collars must be secure
for watertight connection.
g) Inspect the power cable from end to end for
damage such as cuts, breaks, squashed or
trapped sections.
h) Ensure there is not another fishfinder or depth
sounder turned on, which may interfere with
this fishfinder.
i) Electrical noise from the boat’s engine or
an accessory may be interfering with the
transducer(s) and/or the Navman fishfinder.
This may cause the fishfinder to
FISH 4500/4600 Installation and Operation Manual 34 NAVMAN