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190-00067-25 Rev D 5-9
OBS Selected Course Test
Figure 5-7. OBS Selected Course Test Page
1. Rotate the outer function knob until the OBS Selected Course Test Page is displayed (Figure 5-7).
2. Attach OBS Signals to respective pins on Precision Track Selector. Set Track Selector to 150º.
Verify that the input course is 150º ±9º and “CALIB?” appears in the lower right corner of the test
page.
3. Press the CRSR key.
4. Press the ENT key on the GPS 155XL to calibrate the unit. There will be a brief delay while the unit
performs the calibration. Verify that the input course is now 150º ±0.2º.
5. Attach OBS Signals to respective pins on Precision Track Selector. Set Track Selector to 60º, 240º,
and 330º. Verify that in each instance the input course is within ±2º.
External Power and Battery Tests
Figure 5-8. External Power/Battery Test Page
1. Rotate the outer function knob counter-clockwise until the External Power/Battery test page is
displayed (Figure 5-8).
2. Verify that line two of the display indicates “External Power” and the voltage reading is
approximately 13.8 ±0.3 VDC.
3. Connect the wall charger to the unit and verify that line two of the display now indicates ‘Wall
adapter.’
4. Unplug the wall adapter. Line two of the display should go back to indicating ‘External Power.’