Northern Airborne Technology AMU50-001 - Manual (Page 21)

AMU50-001 Audio Management Unit
SM76 Installation and Operation Manual
Section 2 Rev: 1.04
Issue 1 Page 2-9
ENG-FORM: 805-0120.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.4.4.9 Universal Serial Bus (USB)
The AMU50 has one USB 2.0 port which is used for uploading and downloading configuration settings
using the DevCs. The port is only for use during maintenance and must not be connected during flight.
2.4.5 Post Installation Checks
2.4.5.1 Voltage/Resistance Checks
Do not attach the AMU50-001 until the following conditions are met.
Check connector P101 for the following:
a) Pins <38> <39> <40> and <41> for continuity to ground (less than 0.5 Ω) when the relevant switches
are closed.
b) Either pin <9> or <10> for continuity to ground (less than 0.5 Ω) when the relevant switch is closed.
c) Either pin <46> or <48> (ACP 1 or 3 winchman select) for continuity to ground (less than 0.5 Ω) if
installed.
Check connector P102 for the following:
a) Pins <38> <39> and <40> for continuity to ground (less than 0.5 Ω) when the relevant switches
are closed.
b) Pin <46> (ACP 2 winchman select) for continuity to ground (less than 0.5 Ω) if installed.
Check connector P103 for the following:
a) Pin <16> (Norm +28 VDC power) for +28 Vdc relative to ground.
b) Pin <17> (Norm power ground) for continuity to ground (less than 0.5 Ω).
c) Pins <43> <44> <45> and <46> (ICS) for continuity to ground (less than 0.5 Ω) when the relevant
switches are closed.
d) Pin <34> for chassis ground.
e) Pins <47> <48> <49> and <50> (Alerts) for proper connection and operation as per the
applicable aircraft installation requirements.
Note: Alerts are configurable as either HI or LO and can be used for various supplemental
warning operations.
f) Pins <31> <14> and <15> for continuity to ground (less than 0.5 Ω) when the relevant switches are
closed.
Check connector P104 for the following:
a) Pin <16> (Emerg +28 VDC power) for +28 Vdc relative to ground.
Note: This pin must be connected to BACK-UP 28 Vdc power (the Essential/Emer DC Power
Buss).
b) Pin <17> (Emerg power ground) for continuity to ground (less than 0.5 Ω).
c) Pin <34> (Chassis ground) for continuity to ground (less than 0.5 Ω).