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Appendix
Troubleshooting
This section contains information to troubleshoot the MX20 when improper operation is observed. The fol-
lowing table lists possible problems you could encounter. Examine the possible causes of the problem and take
the action listed to correct the problem. If you cannot correct the problem, contact your dealer. If your dealer
is unavailable, contact the Garmin factory at the address and phone number listed in the preceding section.
Be sure to have the information from the System Info page and the data card available before you contact your
dealer or the factory.
Problem Possible Cause Action
Unit does not power on or blank
screen
Wiring problem
Improper brightness setting
Low temperature
Data card
Check for proper wiring and con-
nections. Check the fuse/circuit
breaker
Check the display brightness setting
Allow the MX20 to heat up for ap-
prox. 60 seconds
Make sure the data card is fully
inserted
Unit fails during start up test Data card
System failure
Make sure the data card is fully
inserted
Contact your dealer or the factory
Troubleshooting