Installation Instructions

GTN 6XX/7XX AML STC Installation Manual 190-01007-A3
Page 5-84 Rev. 4
Figure 5-49. Discrete
Outputs Page
5.6.3 Discrete Inputs Checkout
If the GTN is connected to any external switches, perform the
following steps:
1. Go to the GTN Diagnostics page.
2. Go to the Discrete Inputs page, shown in Figure 5-48..
3. For each external switch that is connected, exercise
the switch source and check the ‘ACTIVE’ or
‘INACTIVE’ indication on the screen correlating to
the appropriate input, and ensure it is displayed
correctly.
4. If the state of the switch/LRU is not displayed
correctly, check the wiring to the discrete input and
ensure it is not shorted to ground. Also ensure the
correct type of switch/discrete is connected to the
GTN.
5.6.4 Discrete Outputs Checkout
If the GTN is connected to any external annunciators/systems,
perform the following steps:
1. Go to the GTN Diagnostics page.
2. Go to the Discrete Outputs page, shown in
Figure 5-49.
3. For each annunciator output that is connected to an external system or annunciator, toggle the
output ACTIVE (corresponding box is filled green and displays ‘ACTIVE’) and INACTIVE
(corresponding box is not filled green and displays ‘INACTIVE’) by touching the key
corresponding to the output. Verify that the appropriate external annunciator illuminates when the
output is set to ACTIVE and extinguishes when the output is set to INACTIVE. If the output is
not connected to an annunciator but provides an input to another system, verify that the other
system receives the signal.
4. If the annunciator and/or other system does not receive the signal, verify the wiring and ensure it
is connected properly and not shorted to ground.
Figure 5-48. Discrete Inputs Page