PS Engineering PAC24 Installation Manual - Manual (Page 19)

PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-240-0010 Page 2-12 Rev. 24, Dec. 2013
NOTE: When a panel mounted IntelliPax (11606) expansion unit is used, both the PAC24 and the panel
mounted expansion volume controls are both active. We recommend turning the expansion unit volume
control completely CCW (lowest) and then using the PAC24 volume control to adjust the passengers’ vol-
ume.
NOTE: In installations where an expansion unit is NOT used, the passenger and copilot audio output is
paralleled (J1, pin b). Therefore, unswitched audio will be heard by the passenger(s). Use an expansion
unit, P/N 11616, or 11616R (remote) to isolate passenger audio from unswitched alert audio.
2.4.14.1 Standard Versions, -0100 (J3, Pins 22, 23 and a)
Interface to the IntelliPAX (111606) expansion unit is through, pins 22 (audio input from expansion unit),
23 (audio output to expansion unit) and a (9 VDC expansion power).
These pins are shared with the microphone inputs; therefore the internal DIP switched must be correctly
configured (see above).
2.4.14.2 Intercom expansion Observer Versions, -0400, -0401 (J3, Pins b, 24 and a)
Interface to the IntelliPAX (111606) expansion unit is through, pins 24 (audio input from expansion unit),
b (audio output to expansion unit) and a (9 VDC expansion power).
These pins are shared with other inputs; therefore, the internal DIP switched must be correctly configured
(see above).
2.4.15 CVR Output/Playback button Installation (Pin 2- Option 1 units only)
As shipped from the factory, the PAC 24 has a CVR output on Pin 2, J3. In option 1 units (-0200 & -
0401) this output must be converted to a digital logic input by configuring the DIP switch (see 2.3.2.5).
To activate the Recording System playback, a momentary push button switch is required. This switch can
be located anywhere in cockpit convenient to the pilot's reach. The normally open switch must be con-
nected to pin 2 of J3 of the PAC24, and ground. This pin is shared with the CVR output; therefore the
internal DIP switched must be correctly configured (see above).
2.5 Adjustments
The PAC24 is factory adjusted to accommodate the typical requirements for most aircraft configurations.
There are two adjustments however, that will allow the installer to tailor the speaker volume controls to
suit specific functions. The PA volume adjusts the level of pilot and copilot mic audio in Public Address
mode. The Master Volume adjusts the level of all audio presented to the cockpit speaker.