PS Engineering PMA8000D Installation Manual - Manual (Page 12)

PS Engineering
PMA8000D Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-890-0304 Page 2-4 Rev. 6, Oct. 2014
If an external dimmer control is not used, a constant back light illumination can be established for nighttime
viewing. Pin 6 or 7 (depending on system voltage) must be tied to power (J2, pin 8 or 9) for the back light-
ing system to work. The photocell mounted in the unit face will automatically adjust the intensity of the
push-button annunciator LEDs.
2.4.6 Unswitched inputs
PMA8000D, J1, pins 31, 29 and J2 pin 15 are unswitched, unmuted (by transmitter keying), inputs # 1, 3
and 4, respectively. These inputs are presented to the pilot audio panel and copilot audio panel regardless of
the audio configuration, and will always mute the entertainment inputs. These 510Ω inputs can be used for
altimeter DH audio, GPS waypoint audio, and autopilot disconnect tones, or any other critical audio signal.
Unswitched #1 is always present to the speaker and crew headphones Unswitched 3 and 4 inputs are always
presented to the crew headphones and to the aircraft speaker.
Unswitched
Input
Hear in
Crew Headset
SPR button
Select
Gain
1 Yes No 1:1(fixed)
2 Yes Yes 1:1(fixed)
3 Yes No Adjustable
4 Yes No 1:1(fixed)
5 (jack) Yes No 1:1(fixed)
Table 2-2 Unswitched input table
Unswitched #2, J1 pin 44 is unswitched is always connected to the crew member’s headphone. However,
this unswitched audio is only presented to the aircraft speaker when the SPR push button has been selected.
The audio low for unswitched #4 (J2, pin 15) should be connected to a convenient audio low. However, this
should NOT be connected to Music Low.
NOTE
Inputs 1, 2 and 4 are fixed (1:1), and any audio level adjustments must be made at the input source.
Unswitched #3 has a variable adjustment control located on the bottom side of the unit. This control allows
you to adjust the volume level of that unswitched input. Refer to Adjustments section.
The front panel jack can be configured to act as a fifth unswitched input. When configured through the front
panel function switches (see operational section), the audio input to this jack will be presented to the pilot
and copilot headsets, and not muted.
NOTE
The front-mounted utility jack is intended for portable equipment that is advisory in nature. It is NOT
INTENDED for use as a primary warning channel. Audio of importance MUST ALWAYS be hard-wired
into the unswitched inputs of the audio panel.
2.4.7 "Swap" Mode
When a momentary, normally open, push-button switch is connected between pin 20 on the J2 connector
and aircraft ground, the user can switch between COM 1, COM 2 and COM 3 by pressing this switch with-
out having to change the xmt selector on the audio panel. This yoke-mounted switch eliminates the need to
remove your hands from the yoke to change transceivers. The transfer of TX indication from COM 1 to
COM 2 and COM 3 shows that the swap has been initiated.
Swap selection of COM 3 (COM 1, COM 2, COM 3, or COM 1 and COM 2 only) is a user-selectable op-
tion. Holding the remote “swap” button, press and release the COM 3 RCV button to enable or disable the
COM 3 in the swap rotation.
2.4.8 Bluetooth Telephone Function
The PMA8000D is compatible with most Bluetooth® enabled devices for making and receiving telephone
calls through the aircraft audio system.