Troubleshooting - Furuno GP-3700F Operator's Manual

3. Clean the ball with a damp, soft cloth, then use a dry, lint-free cloth to carefully
wipe the ball dry.
4. Use a swab, moistened with water, to carefully clean the inside of the retaining
ring, the inside of the trackball housing, the supports and the lens. Change the
swab regularly so that dirt and dust build-up is easily removed. Use a dry swab to
wipe away moisture.
Retaining ring - inner side
5. Re-set the ball and retaining ring. Be sure the retaining ring is not inserted re-
versely.
13.5

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.
You cannot turn on the power.
No picture appears.
There is no response when a
key is operated.
Position is not fixed within 90
seconds.
Position is wrong.
Swab
Supports
General troubleshooting
Symptom
Plotter troubleshooting
Symptom
13. MAINTENANCE, TROUBLESHOOTING
Trackball housing
Remedy
• Check for blown fuse.
• Check that the power connector is firmly fastened.
• Check for damaged power cable.
• Check battery for proper voltage output.
• Press the POWER/BRILL key a little harder.
Press the POWER/BRILL key to show the brilliance
window. Adjust the brilliance.
Turn the power off by one of two methods below and
on again.
• Long-press the POWER/BRILL key on the GP-
3700F for 10 seconds.
• Turn the main power off and on.
Remedy
• Check if the antenna connector is firmly connected.
• Check the number of satellites being received, on
the satellite status/location display.
• Check that the correct geodetic chart system is se-
lected on the [SYSTEM SETTING] - [NAVIGATOR
SETUP] menu (on page 1).
• Enter a position offset on the [SYSTEM SETTING]
- [NAVIGATOR SETUP] menu (on page 1).
Lens
13-3