Piper Aircraft Corporation Malibu Mirage PA-46-350P, Airplane Maintenance Manual

Page: 957 / 1956

PAGE 11
Feb 28/07 5D15
34-20-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
CHART 6 (Sheet 1 of 3)
TROUBLESHOOTING EHSI (i.e. - ND)
Trouble Cause Remedy
No display visible at power up. +28 VDC power missing. Check wiring & bus voltage.
+28 VDC Return missing. Check wiring.
Failed ND. Replace ND.
Display powers-up in EADI EADI Display Down mode Check EADI Display Down
Display Down mode. selected. switch.
Failed ND. Replace ND.
Test mode visible at power up Stuck MNU button Check MNU button
ND failed self test Replace ND
Display brightness does not 28 VDC lighting bus not Check wiring and 28 VDC
change when Panel LCD’s connected or not functional lighting bus
dimmer switch operated
Panel LCD’s dimmer module Check/replace module
not functional
Panel LCD’s dimmer switch Check/replace switch.
not functional
Failed ND Replace ND
Menu does not appear when Stuck MNU button Check MNU button
MNU button is pressed
Failed ND Replace ND
Menu cursor does not change Stuck and/or buttons Check and buttons
when and/or buttons
are pressed Failed ND Replace ND
Unable to select menu options Stuck SEL button Check SEL button
when SEL button is pressed
Failed ND Replace ND
Unable to enter Test mode Airspeed equal to or Ensure airspeed is less
when MNU button is pressed greater than 40 knots than 40 knots
detected
Unit not powered off before Ensure unit is powered off
MNU button is pressed before MNU button is
pressed
MNU button pressed and held Ensure MNU button is
for insufficient time pressed and held until
initialization page displays
Failed ND Replace ND
Test menu does not change ND in mission operational mode Ensure ND in test mode
when the and/or buttons
are pressed Stuck and/or buttons Check and/or buttons
Failed ND Replace ND
Unable to select Test pages Stuck SEL button Check SEL button
when the SEL button is pressed
Failed ND Replace ND