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Periodic Maintenance
Apollo SL40 Installation Manual
23
APPENDIX B - PERIODIC MAINTENANCE
EQUIPMENT CALIBRATION
The SL40 design requires very few adjustments or calibration to be made. In fact, there are no
internal manual adjustments.
REFERENCE OSCILLATOR
The reference oscillator frequency should be checked approximately every 3 to 5 years to
ensure the units transmit frequency is within allowable tolerance.
The oscillator frequency can be checked by connecting the transmitter output through an
appropriate load to a calibrated frequency counter. The transmit frequency should be within
15ppm of the selected channel frequency. Contact the Garmin AT, Inc. factory for instructions
on adjusting the frequency if required.
CLEANING THE FRONT PANEL
The front bezel, keypad, and display can be cleaned with a soft cotton cloth dampened with
clean water. DO NOT use any chemical cleaning agents. Care should be taken to avoid
scratching the surface of the display.