Garmin GPS 165 TSO - Manual (Page 107)

Maintenance
The GPS 155 is built to exacting standards and does not require user
maintenance. Should the faceplate and lens require cleaning, use a soft cloth and non-
abrasive cleaner. The user data is maintained by an internal battery with a projected
life of 3 to 5 years. If the GPS 155 detects a low memory battery, you will be
informed with the message ‘Memory battery low’. You should return your unit to an
authorized GARMIN service center as soon as possible. Failure to do so may result in
loss of data each time you turn your unit off. This will GREATLY increase satellite
acquisition time and no user data will be saved. This condition will be accompanied
by the message ‘Stored data lost’.
The GPS 155 contains a crystal oscillator, which may drift after many years of
operation. If the unit detects excessive oscillator drift, you will be informed with the
message ‘Osc needs adjustment’. When this occurs, contact an authorized GARMIN
service center for service. Failure to do so may result in severely degraded
acquisition performance.
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APPENDIX B
GPS 155 Maintenance
155man (GOOD) 7/24/98 1:57 PM Page 97