Furuno FCV-620 - Manual (Page 33)

3. MAINTENANCE, TROUBLESHOOTING
24
3.6 Troubleshooting
The table below provides basic trouble-
shooting procedures which the user may
follow to restore normal operation.
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 opera-
tion, contact your dealer for advice.
1. Press the MENU/ESC key to open the menu.
2. Use
S
or
T
to choose Tests under System
and press the ENTER key.
Tests menu
3. Use
S
or
T
to choose Test and press the
ENTER key.
Test display
The ROM, SDRAM and NMEA port are
checked, with the results shown as OK or
NG (No Good). For any NG, request ser-
vice. (A special connector is required to
test the NMEA port. Nothing appears if no
connector is connected.)
4. The ovals and circles at the right side of the
test display are for checking the controls.
Checking key and TrackPad: Press each
key and the arrows on the TrackPad one
by one. A control's corresponding on-
screen oval "lights" in red if the control is
normal.
Troubleshooting table
If... then check...
neither echo nor
fixed range scale
appears • battery voltage.
• fuse.
• power supply.
• power cable.
no echo appears
but the fixed range
scale appears • if display advance
speed is not set to
"Stop."
• transducer plug.
• transducer cable.
echo appears but
no zero line • if range shifting is set
to "0."
• if zero line rejection is
off.
sensitivity is low • gain setting.
• if air bubbles or marine
life is not clinging to
the transducer face.
• if sediments are not
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 oper-
ated nearby.
the speed/water
temperature
readout is unreal-
istic or not present • sensor plug.
the position
readout is unreal-
istic or not present • the connection
between sounder and
navigator.
• navigator.
Tests
S
/
T
/
W
/
X
: Select
[ENTER] : Enter
[MENU] : Back
Test
LCD Test
ROM : OK
SDRAM : OK
NMEA :
Temp : -9.5
°
F
Speed : 10.0 kt
Power : 12.4 V
CPU Program No. : 0252346-XX.XX**
FPGA Program No. : 0252348-XX.XX
Push [MENU] 3 times to exit.
Water
temperature*,
Speed*
Battery
Voltage*
Color Bar
5.0
DUAL
}
Indication of
GAIN knob
Indication of
MODE knob
*: Updated every second.
XX: Program version number
**: FCV-620: 0252346-XX.XX
FCV-585: 0252347-XX.XX
ECHO : 4281
For adjustment
at factory