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Page 5-54 400 SERIES MAINTENANCE MANUAL
Rev. C P/N 190-00140-05
5.7.6.25 OBS
The load used in the OBS test consists of a calibrated OBS
resolver, Precision Track Selector or equivalent, and must be
connected to the GPS OBS inputs.
The OBS bearing must be consistent to within r2 degrees of the bearing setting. If this output
requires an alignment, this alignment can be done on the unit level by using the configuration
page (NOTE: not the Test Page “MAIN CDI/OBS CONFIG”). See Section 5 for instructions on
using the configuration page.
On this page, monitor the current measured angle using the “SELECTED COURSE” field and
calibrate the unit using the “Calibrate to 150?” field (do this after the bearing is selected to 150
degrees). Note that the angle displayed is rounded to one tenth of a degree.
For: MAIN OBS ROTOR C (J1-31)
MAIN OBS ROTOR H (J1-32)
MAIN OBS STATOR D (J1-33)
MAIN OBS STATOR E (J1-34)
MAIN OBS STATOR F (J1-35)
MAIN OBS STATOR G (J1-36)
1. Set test set to the following angles.
2. Using the page “MAIN CDI/OBS CONFIG” configuration page verify angle via the Main
CDI/OBS Config Test Page (Figure 5-13).
60
q
_____(60
r
2
q
)
150
q
_____(150
r
2
q
)
240
q
_____(240
r
2
q
)
330
q
_____(330
r
2
q
)
Figure 5-13. Main CDI/OBS Configuration Page
This completes the testing section.