12. MAINTENANCE, TROUBLESHOOTING
12-3
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.
5. Re-set the ball and retaining ring. Be sure the retaining ring is not inserted re-
versely.
12.5
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.
Symptom
Remedy
You cannot turn on the power.
• 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.
No picture appears.
Press the
POWER/BRILL
key to show the brilliance
window. Adjust the brilliance.
There is no response when a
key is operated.
Turn the power off by one of two methods below and
on again.
• Long-press the
POWER/BRILL
key on the GP-
3700 for 10 seconds.
• Turn the main power off and on.
Position is not fixed within 90
seconds.
• Check if the antenna connector is firmly connected.
• Check the number of satellites being received, on
the satellite status/location display.
Position is wrong.
• 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).
Track for own ship is not plot-
ted.
• Check that [DISP. STOPPED TRACKS] in the
[MARK/TRACK SETTING] menu is set to [SHOW].
• Check that [DISPLAY TRACKS] in the [MARK/
TRACK SETTING] menu is set to [SHOW].
Swab
Retaining ring - inner side
Supports
Lens
Trackball housing
