PS Engineering PMA7000CAP Installation Manual User Manual

Page 16

PS Engineering

PMA7000M-S Series Audio Selector Panel and Intercom System

Civil Air Patrol Version Installation and Operator’s Manual

200-072-0004

Page 2-9

Rev. 4, Sept. 2000

Warning: Do not over- tighten the lock down screw while installing the unit in

tray. Internal damage will result.

2.10.1 Operational Checkout

1. Apply power to the aircraft and avionics.
2. Plug headsets into the pilot, copilot, and occupied passenger positions.
3. Rotate the Mic Selector Switch to the Com 1 position.
4. Verify that the Com 1 button lights. Verify that the green transmit LED (Light Emitting

Diode) near the mic selector is not illuminated. If the LED is on, stop testing and
troubleshoot the microphone PTT installation.

5. Verify proper transmit and receive operation from the copilot position, noting that the

copilot PTT switch allows proper transmission on the selected transceiver.

6. Verify that pushing the C

2 button causes the button to illuminate, and the Com 2

receiver to be heard. Verify operation on Com 1 from the pilot position.

7. Repeat for Com 2 and Com 3, (if installed).
8. Rotate the mic selector switch to the C

1/2 position. Verify that the pilot communicates

on Com 1 and the copilot on Com 2.

9. Rotate the mic selector switch to the C

1/3 position. Verify that the pilot communicates

on Com 1 and the copilot on Com 3.

10. Rotate the mic selector switch to the C

2/3 position. Verify that the pilot communicates

on Com 2 and the copilot on Com 3.

11. Verify that the external swap switch causes the swap LED to illuminate, and reverses the

transceiver in use indicated on the mic selector.

12. Verify proper operation of all receiver sources by selecting them using the button. Note that

the button for the receiver sources stays in, and the button illuminates to show which source
is in use.

13. Push in the S (SPR) button. Verify that all selected audio is heard in the cockpit speaker.

Verify that the audio mutes when the mic is keyed.

14. Verify that the LED in the lower right side illuminates when either push to talk is keyed.
15. Verify proper Intercom system operation in the A

, I

and C

REW

modes (see Table 3-

1).

16. Verify that the audio selector panel system does not adversely affect any other aircraft

system by systematically switching the unit on and off, while monitoring the other avionics
and electrical equipment on the aircraft.

2.10.1.1

Marker Checkout (7000M-S only)

1. Connect a ramp generator at the antenna end of the marker coax. With the unit under test in

HI sensitivity, verify that a 160

V, modulated 95% with 1300 Hz, signal will illuminate the

amber (M) marker light, and that marker audio is present in the headphones when the
Marker Audio (M) push-button has been depressed. Select "S" for speaker to verify
marker audio availability on the cabin speaker. Verify that the white (A) and blue (O) lights