Apollo SL15-CD Manuel D’Utilisation

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The two push buttons at the far right of the SL15-CD Option CD control the com-

pact disk operation. Inserting the disc into the CD-15 remote player unit will auto-

matically begin play. 

The lower button (play/pause/advance) is used to play the disc from 
stop, pause play, and advance the track. When the disc is stopped, 
pushing the button starts play. A short push will pause play. A longer 
press advances the track. Holding the button acts as a intro/scan, play-
ing the first two seconds of each track until released. The top button is 
used to stop and eject the disc. Press momentarily to stop, press and 
hold to eject. Pushing BOTH buttons momentarily will cause the CD to “back 
up.” If pushed in mid song, it will back up to the beginning of the track. At the 
beginning of a song, it will go back to the previous track. 

This “back-up” feature implemented with Software Release BBBB for units 
without IRS and FBBBB for units with IRS and later. The software version is 
found on the side of unit by serial label. Holding BOTH buttons in for more than 
two seconds will cause the CD player to power down. 

The optional Marker Beacon Receiver uses visual and audio indicators to alert 

you when the aircraft passes over a 75 MHz transmitter. 

The Blue lamp, labeled "O," is the Outer Marker lamp 
and has an associated 400-Hertz 'dash' tone. The lamp 
and tone will be keyed at a rate of two tones/flashes per 
second when the aircraft is in the range of the Outer 
Marker Beacon. 

The Amber lamp, labeled "M," is the Middle Marker lamp and is coupled with a 1300-
Hertz tone. It is keyed alternately with short 'dot' and long 'dash' bursts at 95 combina-
tions per minute. 

The White lamp, labeled "I," is the Inner marker and has a 3000-Hertz 'dot' tone. 
The lamp and tone will be keyed at a rate of six times per second.

The audio from the Marker Beacon Receiver can be heard by selecting the "MKR" 
push-button switch. To adjust the volume level, there is a service adjustment located 
on the top of the unit. 

A three-position switch is used to set the receiver sensitivity and to test the indi-
cator lamps. Use "HI" sensitivity initially. This allows you to hear the outer 
marker beacon about a mile out. Then select the “LO” sensitivity to give you a 
more accurate location of the Outer Marker. The momentary down switch posi-
tion is marker test, labeled "T/M" and illuminates all three lamps simultaneously 
to assure the lamps (internal and external) are in working order. TST does not 
activate MM sense output. 

Pressing the marker mode select down (to “T/M”) will cause the marker audio to 

mute for that beacon. The next beacon received will re-activate the audio.