Garmin 155XL Maintenance Manual

Garmin 155XL Maintenance Manual Manual pdf 38 page image

190-00067-25 Rev D 5-78. With the MSG annunciator OFF, verify the DMM voltage is greater than 4.5 VDC.9. Rotate the inner function knob to turn the MSG annunciator ON. Verify the DMM voltage is lessthan 0.3 VDC.10. Measure voltage across J1-12 and J1-22.11. Rotate the outer function knob clockwise to select the ARRVL annunciator test.12. With the ARRVL annunciator OFF, verify the DMM voltage is greater than 4.5 VDC.13. Rotate the inner function knob to turn the ARRVL annunciator ON. Verify the DMM voltage isless than 0.3 VDC.14. Measure voltage across J1-28 and J1-22.15. Rotate the outer function knob clockwise to select the APPR annunciator test.16. With the Appr annunciator off, verify the DMM voltage is greater than 4.5 VDC.17. Rotate the inner function knob to turn the Appr annunciator to ACTV. Measuring across J1-13 andJ1-22, verify the DMM voltage is less than 0.3 VDC.18. Rotate the inner function knob to turn the Appr annunciator arm. Verify the DMM voltage is greaterthan 4.5 VDC.19. Measure voltage across J1-9 and J1-22.20. Verify the DMM voltage is less than 0.3 VDC.21. Rotate the inner function knob to turn the Appr annunciator to off. Verify the DMM voltage isgreater than 4.5 VDC.22. Rotate the inner knob to select ‘appr actv’. Verify the DMM voltage is greater than 4.5 VDC.External Switches TestFigure 5-5. External Switches Test Page