PS Engineering
PCD7100 Series Intercom System with Integral Music System
Installation and Operator’s Manual
CASE I
: PTT is built into both pilot and copilot yokes.
CASE II:
PTT is in pilot yoke only. This configuration requires a modified external PTT switch plugged
into the copilot's microphone jack. (See Appendix A). When the copilot's PTT is pressed, the intercom
switches the microphone audio from pilot to copilot mic.
CASE III
: No built in PTT. This requires two built in PTTs to be installed, or modified external PTT
switches to be used. Modify external PTT as required (See Appendix A).
No Push to Talk is required for CD-only (11952, 11953).
2.4.4 Backlighting
The PCD7100 has an automatic dimming of the pushbutton annunciator LEDs controlled by a photocell. A
dimmer control allows the bezel text backlighting to be controlled by the aircraft dimmer. Connect the 14
V dimmer control to pin 1, the 28 V dimmer to pin A, as required.
2.4.5 Intercom wiring (11950, 11951, 11956, 11957 only)
See Appendix for intercom connection configurations. It is critical to the proper operation of this system to
have this connector wiring made in accordance with these diagrams. Use 2- and 3-conductor, MIL-spec
cable as shown. Connect the shields at the PCD7100 end only, and tie to the audio low inputs as shown.
NOTE:
The harness can be custom made by PS Engineering, Inc. Simply call the factory or access
www.ps-engineering.com
on the internet to obtain a wire harness work-sheet. The harness will be made to
your specifications and fully functionally tested. All hardware is included.
2.4.5.1 Entertainment 2 Input
NOTE
: Use the low-level output of any entertainment device to connect to the
PCD7100. Minimum of 1 VAC p-p, maximum signal level is
3 VAC
p-p.
DO NOT
use a speaker-level output, this will cause internal damage in the PCD7100
An additional stereo entertainment device (CD player, cassette player, etc.) can be connected to the unit.
Install a
1
/
8
-inch stereo jack in a convenient location so that the pilot can plug in the entertainment devices
into the system. The audio signal at the entertainment input must be a minimum of 1 V P-P per channel for
optimum music performance.
All
external
entertainment devices must be switched
off
for both takeoff and landing.
2.4.5.1.1 Entertainment distribution
Entertainment source #1 (CD player) provides music for the pilot and copilot positions in crew mode and
everybody in ALL. Entertainment source #2 provides music for the four passenger positions in crew mode
only. The PCD7100-system incorporates a "Soft Mute" for the CD player. This will mute the music during
ICS or radio conversation.
Entertainment inputs #1 and #2 can be paralleled (connected together) so the internal CD entertainment
source can serve both the passengers and the crew. However, we suggest that a switch (DPDT) is installed
between the single entertainment device and entertainment input #1 to allow entertainment flexibility.
Caution:
Local oscillators and internal signals from some entertainment equipment can cause undesired
interference with other aircraft systems. Before takeoff, operate the entertainment devices to determine if
there is any adverse effect within the aircraft systems. If any unusual operation is noted in flight, immedi-
ately switch off the entertainment devices.
Both entertainment devices must be switched off for both takeoff and landing.
200-971-0005
Page 2-3
Rev. 5, Dec. 2002
