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

Page: 1475 / 1956

PAGE 5
Feb 28/07 7I5
77-40-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
Trouble Cause Remedy
Audio alarm does not function Loss of connection to Check connection from
during exceedance. alarm. instrument to alarm.
Faulty alarm. Change alarm.
Faulty internal alarm Return module to factory.
circuit in module.
Non-uniform lighting. Faulty light bulb. Return module to factory.
Pointer does not return to Sticky pointer or faulty Return module to factory.
zero with power-off. return to zero mechanism.
CHART 1 (Sheet 2 of 2)
TROUBLESHOOTING DUAL ANALOG MODULE INDICATORS
C. Quad Digital Indicator (QDI) / Enhanced Digital Indicator (EDI) Module
The Quad Digital Indicator (QDI) / Enhanced Digital Indicator (EDI) is a precision microprocessor
based instrument which contains two Dichroic Liquid Crystal Displays (LCDs) with two lines (QDI),
or three lines (EDI), each for display, and an annunciator in the lower left corner of each LCD. The
LCDs are backlit for use in low ambient light conditions, and contain heaters for low temperature
operation. The QDI and EDI are capable of displaying four or six engine parameters at one time,
respectively. The QDI lower half is dedicated to engine manifold pressure and RPM while the upper
half will digitally display a selected analog indicator reading. The EDI top line is dedicated to engine
manifold pressure and RPM, the middle displays selected analog indicators, and the lower displays
OAT and % PWR.
Electrical interface is provided by a single 25 pin male “D” subminiature connector. The QDI/EDI
contains EMI and RFI protection.
An independent signal conditioning circuit is provided for Outside Air Temperature (OAT).
(1) Functions include:
(a) Automatically posts exceedance warnings.
(b) Stores analog indicator exceedance data for future maintenance review.
(c) Digitally enhances any selected analog indicator in the EMIS system stack.
(d) Performs and posts "Real Time" fuel management calculations.
(e) Automatically posts fuel imbalance using an external panel annunciator.
(2) Front Display and Pushbutton Controls (See Figure 3.)
The QDI/EDI contains two LCDs, one in each window, with two or three lines, respectively, for
numerical display. The display is capable of posting four or six parameters at one time. In
addition, there are four or six front-accessible buttons to select and/or control the following
display modes:
(a) Display Blanking (e) Maximum Fuel Load Entry
(b) Fuel Management (f) Exceedance Review
(c) Outside Air Temperature (g) Percent Power (EDI only - S/N’s 46360132
thru 4636374 )
(d) Manual Fuel Load Entry
A summary of these pushbutton functions for the QDI only are listed in Figure 3 for easy
reference. These controls are explained within this section.
(3) Remote Switch Controls, External Alarm, External Interface Overview