Installation manual

AMX240 Audio Panel Installation Manual
200-890-0240 Rev. 02
2.6.3 Middle Marker Sense
A Middle Marker Sense output signal is available from the AMX240 to certain flight control systems. This function
will not operate during the test mode. This output will go to +4.5 VDC ( 1.0 VDC) when a valid Middle Marker
signal is received. This output is J1, pin 39.
2.7 Adjustments
The AMX240 is factory adjusted to accommodate the typical requirements for most aircraft configurations. There
are three adjustments in the top cover that allow the installer to tailor the specific functions.
TEL
VOL
SPR
VOL
ANN
VOL
MKR
VOL
J1
J2
Figure 2-4- AMX240 Adjustments, top cover
 Speaker Volume- Turn adjustment clockwise to increase cabin speaker output.
 Marker Beacon Volume, turn adjustment counterclockwise to increase marker beacon audio level.
 TEL volume, turn adjustment Clockwise to increase the incoming telephone audio.
 ANN VOL Function Mode Annunciation Volume – controls the level of the to access voice annunciations
contained in the unit. (Top cover must be removed).
 Unswitched Input 3 Volume, adjust from 50% to 200% of input value. (Bottom cover must be removed).
Front
of unit
NOTE:
If top cover is removed
for ANY reason, you
MUST replace the cover
screws with the proper
length, otherwise damage
will result.
Shorter Screw