Garmin SL40 - Manual (Page 19)

Installation
Apollo SL40 Installation Manual 13
5. Turn the unit off to exit the Test Mode.
Mic Level Adjustment
Those units with audio board p/n 415-7008-01, or later, have the ability to make adjustments
to microphone sensitivity by using the M
IC 1 L EVEL and M IC 2 L EVEL pages in the Test Mode.
1. Press and hold the œ and R
CL keys while switching the unit on.
2. Turn the L ARGE knob to the M IC 1 L EVEL and M IC 2 L EVEL pages.
3. Press the œ key to start selection (the number will flash).
4. Turn the S
MALL
knob to change the value. Press M
EM
to store the value.
5. Turn the unit off to exit the Test Mode.
Display Test
It is possible to perform a simple test to observe all segments of the display for a quick
checkout of the display functions.
1. Press and hold the
œ and R
CL
keys while switching the unit on.
2. Turn the L
ARGE
knob to the DISPLAY TEST page.
3. Press M
EM
to perform the test. A series of “#” symbols will advance across the display
testing each LED.
4. Turn the unit off to exit the Test Mode.
Mic Squelch
Adjustments to the squelch levels for Mic1 and Mic2 are available in the System Functions
mode. To adjust the Microphone Squelch level:
1. Press and hold the M
ON
button for about two seconds. This will access the System
Functions mode.
2. Rotate the
LARGE
knob to display the M
IC
1
OR
M
IC
2 S
QLCH
pages.
3. Rotate the S
MALL
knob to change the level number. The range of the number is 000 to
127.
4. Press any key to exit the Setup Functions mode.
5. Select an appropriate frequency, key the transmitter, and talk into the microphone to check
the level.
Transmit Mic
The Transmit Microphone page allows you to control which microphone is permitted to
transmit. You may choose Mic 1, 2, or both. To adjust the Transmit Mic control:
1. Press and hold the M
ON
button for about two seconds. This will access the System
Functions mode.
2. Rotate the
LARGE
knob to display the T
RANSMIT
M
IC
page.
3. Rotate the S MALL knob to select MIC1, MIC2, or MIC1+MIC2.
4. Press any key to exit the Setup Functions mode.
5. Select an appropriate frequency, key the transmitter, and talk into the microphones to
check for the intended operation.