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MULTI 3100 Installation and Operation Manual
NAVMAN
Appendix B - Troubleshooting
This troubleshooting guide assumes that you have
read and understood 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. Specialized
methods and testing equipment are required to
ensure that the unit is reassembled correctly and is
waterproof. Repairs to the unit must only be carried
out by a service centre approved by NAVMAN NZ
Limited. Users who service the unit themselves will
void the warranty.
More information can be found on our website:
www.navman.com
1 Unit will not turn on:
a Fuse blown or circuit breaker tripped.
b Battery voltage is outside the range 10.5 to
16.5 V DC.
c Power/data cable damaged.
2 Speed reading wrong or erratic:
a Calibration is incorrect (see section 3-7).
b Speed transducer cable unplugged or
damaged.
c Speed/temperature transducer fouled or
damaged. Check paddle wheel is aligned
fore and aft in the fitting. Remove
paddlewheel from fitting, check for fouling
or damage. Spin paddlewheel by hand,
check for a speed reading.
d Speed transducer installed incorrectly or
transducer does not have a smooth flow of
clear water over it. Review installation.
e Interference from electrical noise. Review
installation.
3 Depth reading wrong or erratic:
a Unit temporarily unable to detect bottom,
for example water too deep or too shallow,
water not clear, boat reversing and
transducer in turbulent water.
b Depth transducer cable unplugged or
damaged.
c Depth transducer fouled or damaged.
Check for fouling, damage or too thick a
layer of paint over it.
d Depth transducer installed incorrectly or
transducer does not have a smooth flow of
clear water over it. Review installation.
e Interference from the ultrasound pulse from
another depth sounder.
f Interference from electrical noise. Review
installation.
To check the transducer, disconnect it and
connect a known good transducer temporarily.
Hold it over the side of the boat in the water
and check if the unit displays a depth.
4 Temperature reading wrong:
a Calibration is incorrect (see section 6-2).
b Speed/temperature transducer cable
damaged.
5 The word SIM flashes at bottom, right of
screen, values displayed are unexpected:
a Unit is in simulate mode (see section 2-5).
6 The display fogs:
a Moist air has entered the breathing tube at
the rear of the unit. Air the boat or run unit
with backlight fully on.
b Water has entered the breathing tube.
Return unit for service.
17


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