Furuno Ls4100 - Manual (Page 28)

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3.6 Troubleshooting
The table below provides basic
troubleshooting procedures which the
user may follow to restore normal
operation.
Troubleshooting table
If… Then check …
neither echo nor
fixed range scale
appears • battery voltage.
• fuse.
•
power cable.
no echo appears
but the fixed
range scale
appears
•
if display advance
speed is set to “Stop.”
• transducer plug
•
transducer cable
echo appears but
no zero line • if range shifting is set
to “0.”
sensitivity is low • gain setting.
•
if air bubbles or marine
life is clinging to the
transducer face.
• if sediments are
present in the water.
•
if the bottom is too soft
to return an echo.
there is extreme
interference or
noise • if the transducer is too
close to the engine.
•
if the unit is properly
grounded.
• if other echo sounders
of the same frequency
as own are being
operated nearby.
the speed/water
temperature
readout is
unrealistic or not
present
•
sensor plug.
the position
readout is
unrealistic or not
present • the connection
between sounder and
navigator.
• navigator.
3.7 Diagnostics
If you feel your unit is not working
properly, conduct the diagnostic test to
find the problem. If you cannot restore
normal operation, contact your dealer
for advice.
1. Turn on the power while pressing the
[MENU/ESC] key. Continue pressing
the [MENU/ESC] key until the
Installation menu appears.
SIMULATION On
TEST ...
LCD PATTERN ...
MEMORY CLEAR
NMEA PORT : In/Out
NMEA MIX : Off
GPS WAAS* : Off
SET BOTTOM LEVEL ..
Installation Menu
* = Setting cannot be changed when
NMEA PORT setting is "In/In."
Installation menu
2. Press▼ to choose TEST.
3. Press ► to start the test.
ROM : OK
RAM : OK
NMEA :
Temp : 68.2 ° F
Speed : 10.0km/h
Power : 12.4 V
Body : 39
° C
Program No. 0252318-01.**
Push [MENU] 3 times to exit.
Level bar
** = Program version no.
Water
Temperature,
Speed
Battery Voltage
Temperature
inside display
unit
(Unit fixed at
° C.)
GPS (48502180**): OK
Only when GP-310B is connected.
(For GP-320B: 4850238**)
Test display