PS Engineering PMA8000C Installation Manual - Manual (Page 16)

PS Engineering
PMA8000C Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-890-0303 Page 2-9 Rev. 3, May 2014
2.6.2 External Marker Lights
For installations that require external marker beacon lights, there are three outputs that can drive 12-Volt
lamps only. The external output lamps are driven high (typically +7.0 VDC
4.0 VDC unloaded, at MAX
brightness) when active. Maximum source current per lamp is 125mA. Voltage varies with photocell dim-
ming.
2.6.3 Middle Marker Sense
A Middle Marker Sense output signal is available from the PMA8000C 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 PMA8000C is factory adjusted to accommodate the typical requirements for most aircraft configura-
tions. There are three adjustments in the top cover that allow the installer to tailor the specific functions.
Figure 2-3- PMA8000C 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 an-
nunciations 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 re-
moved).
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