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7. RS-232 / RS-422 / ARINC 429 Loopback Tests:
a. Press the CRSR key.
b. Rotate the outer function knob until the I/O Test Page is displayed:
c. Verify that the I/O Test Page indicates “CH 1 OK” and “CH 2 OK”.
d. Verify that the I/O Test Page indicates “RS422 OK”.
e. Verify that the I/O Test Page indicates “A429 OK”.
8. Annunciator Output Test:
a. Rotate the outer function knob until the Annunciator Test Page is displayed:
b. Turn the FUNCTION SELECT switch on the test panel to position #5.
c. Press the CRSR key.
d. Rotate the inner function knob to turn the front panel annunciators ON. Verify that all six annunciators
on the GPS 155 are lit.
e. Rotate the power/ dimmer knob counterclockwise, but not past the detent (off) position, to ensure that
the annunciators are dimmable.
f. Rotate the inner function knob to turn the front panel annunciators OFF. Verify that all six annunciators
on the GPS155 are off.
g. Rotate the outer knob counterclockwise to select the APPR annunciator test.
h. With the APPR annunciator OFF, verify that the DMM voltage is greater than 4.5 VDC.
i. Rotate the inner function knob to turn the APPR annunciator ON. Verify that the DMM voltage is less
than 0.3 VDC.
j. Turn the FUNCTION SELECT switch on the test panel to position #6.
k. Rotate the outer function knob until the MSG annunciator test is selected.
l. With the MSG annunciator OFF, verify that the DMM voltage is greater than 4.5 VDC.
m. Rotate the inner function knob to turn the MSG annunciator ON. Verify that the DMM voltage is less
than 0.3 VDC.
n. Turn the FUNCTION SELECT switch on the test panel to position #7.
o. Rotate the outer function knob clockwise to select the ARRVL annunciator test.
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