Specifications

PS Engineering

PMA8000B Audio Selector Panel and Intercom System

Installation and Operator’s Manual

200-890-0100 Page 2-8 Revision 8, May 2008

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 +9 VDC ±1.5 VDC unloaded, at MAX

brightness) when active. Maximum source current per lamp is 125 mA. Voltage varies with photocell dim-

ming.

2.6.3 Middle Marker Sense (Marker version)

A Middle Marker Sense output signal is available from the 8000 to 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 PMA8000B 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 2-2- PMA8000B 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 re-

moved).

Front

of unit

NOTE:

If top cover is removed

for ANY reason,

MUST replace the cover

screws with the proper

length, otherwise dama

will

result.

Shorter Screw