Garmin Apollo SL40 Installation Manual - Ppendix

Periodic 

Maintenance 

Apollo SL40 Installation Manual 

23

A

PPENDIX 

B

-

P

ERIODIC 

M

AINTENANCE

E

QUIPMENT 

C

ALIBRATION

The SL40 design requires very few adjustments or calibration to be made. In fact, there are no 

internal manual adjustments. 

R

EFERENCE 

O

SCILLATOR

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. 

C

LEANING THE 

F

RONT 

P

ANEL

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.