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7. MAINTENANCE, TROUBLESHOOTING
7-3
7.4 Simple Troubleshooting
This section provides simple troubleshooting procedures which the user can
follow to restore normal operation. If you cannot restore normal operation do not
attempt to check inside the unit. Any trouble should be referred to a qualified
technician.
7.4.1 General
General troubleshooting
If… Then…
you cannot turn on the
power
• check for blown fuse.
• check that the power connector is firmly fastened.
• check for corrosion on the power cable connector.
• check for damaged power cable.
• check battery for proper voltage output (10.8 to 31.2 V).
there is no response
when a key is pressed
• turn off and on the power. If there still is no response the key may
be faulty. Request service.
7.4.2 Plotter
Requires GPS Receiver GP-310B/320B.
Plotter troubleshooting
If… Then…
position is not fixed
within three minutes
• check that antenna connector is firmly fastened.
• check number of satellites received, on the GPS status display.
(See page 7-11.) There should be three or more.
position is wrong
• check that the correct geodetic chart system is selected, on the
GPS SENSOR SETTINGS menu.
• enter position offset, on the GPS SENSOR SETTINGS menu.
the track is not plotted
• track is not being plotted. (“H” icon appears at the top of the
display.) Press the TRACK HALT soft key on the TRACKS &
MARKS CONTROL menu to start plotting again.
the bearing is wrong
• check that correct magnetic variation is entered, on the GENERAL
SETUP menu.
Loran C (or Decca)
TDs do not appear
• check that LORAN C (or DECCA) is selected at TD DISPLAY on
the GENERAL SETUP menu. Also, check that proper Loran C
(Decca) chains codes are entered, on the TD SETUP menu.
Loran C (or Decca)
TDs are wrong
• enter TD offset on the TD SETUP menu.
the ship’s speed
indication is not zero
after the ship is
stopped
• try to decrease speed/course smoothing, on the GPS SENSOR
SETTINGS menu.