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3.2 Troubleshooting
This section provides troubleshooting procedures. Advanced level troubleshooting should
be done by referring to the Service Manual (optional supply).
Problem Probable cause Remedy
General
Loosened power cable Fasten the power cable.
Cannot turn on the
power.
Blown fuse Replace the fuse.
Power is on but
nothing appears on
the screen.
Contrast too low. Press the [*] key several times.
Doppler speed indication
10.0
12.50
SPEED
DISTANCE
nm
Last correct speed is displayed
(display freezes).
Reverse video and blinking
kt
STW
Ship’s speed cannot be calculated
because of air bubbles, etc. (Speed error :
30 seconds)
SPEED
DISTANCE
nm
**. *
12.50
Speed shown as "**.*".
kt
STW
• Problem with the transducer or air
bubbles.
• Speed error continues more than 30
seconds.
SPEED STW
DISTANCE
nm
10.0
12.50
STW
flashing
kt
• Temperature sensor is abnormal.
GPS speed indication
**.*
12.50
SPEED GPS
DISTANCE
nm
Speed indication shown as "**.*".
kt
GPS data error.
SPEED
DISTANCE
nm
12.50
"GPS" is replaced with "----".
----
kt
---
• No GPS data for 30 seconds.
• GPS receiver disconnected.
If any abnormal speed indication continues
contact your dealer for advice.