(c)  
The dual FCC option pin set to logic zero indicates the three FCC option.

 (d)  
Customer Option Pins:

 1)  Pin 1 set to logic zero indicates ADC Bus switching to the FCCs is not available on the pilots instrument select panel.
 2)  Pin 2 set to logic zero indicates FMC Bus switching to the FCCs is not available on the pilots instrument select panel.
 3)  Pin 3 set to logic zero indicates to the MCDP that the airplane has separate autopilot disconnect switches and autothrottle disconnect switches.
 4)  Pin 4 set to logic one enables the FMC fault reporting to the MCDP.
 5)  GUN 001-010;
 pin 5 is a spare pin.

 6)  GUN 011-999; MCDU/FMC SWITCHING (option 5) pin set to logic zero indicates FMC switching on the pilots instrument select panel is not a three position rotary switch and does not affect FMC inputs to the FCC's.
 (10) The MCDP is an electrostatic sensitive unit that requires special handling using authorized procedures (Ref Chapter 20).
 3.  Operation_________
 A.  Functional Description
 (1)  Maintenance Control Display Panel Schematic (Fig. 4)
 (a)  The CPU in the MCDP initiates an automatic power-up and self-test routine after each landing when an on-ground condition is sensed by either air/ground relay. The 5 vdc keep-alive-power on the CPU enables the power-up routine. A three minute timer is started at the same time the power-up routine is initiated. A successful self-test starts the flight faults routine. The flight faults routine requests fault data from the six computers (3 FCC, 2 FMC, 1 TMC). A failed self-test causes the CPU to power-down the MCDP. No flight fault data is transferred. The CPU normally powers-down the MCDP after all flight faults are received or after three minutes.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

(b)

(c)

(d)

(e)

757
MAINTENANCE MANUAL

The manual power-up and self-test routines are initiated by momentarily pressing the ON/OFF switch on the MCDP front panel. The FAIL light in the ON/OFF switch is turned on during the self-test routine. It turns off after five seconds if the self-test is successfully completed. During the self-test, a display test pattern is provide for three seconds so the operator can verify that all the switch/light lights and display light segments are working. After the FAIL light is turned off, the MCDP automatically enters FLT FAULT Mode and displays LAST FLT FAULTS?.With LAST FLT FAULTS? displayed after a successful self-test, pressing the YES/ADV switch causes a fault from the last flight to be displayed. Each time the YES/ADV switch is pressed, a different last flight fault is displayed until all last flight faults have been displayed. After all last flight faults have been displayed, the display reads ALL LAST FLT FAULTS READ. If there are no previous flight faults, then the display reads NO LAST FLT FAULTS after the YES/ADV switch is pressed the first time.With LAST FLT FAULTS? displayed after a successful self-test, pressing the NO/SKIP switch causes PREV FLT FAULT? to be displayed. Then pressing the YES/ADV switch causes the previous flight faults to be displayed. Each previous flight fault is prefaced by the associated flight number. The flight number represents the number of flights since the displayed fault occurred. Up to 99 flights can be counted, but only 10 fault flights are stored. Flight numbers are skipped if no fault is stored for that flight. The message ALL PREV FLT FAULTS DSPLY is displayed after all previous flight faults have been displayed. If there are no previous flight faults, the message NO PREV FLT FAULTS is displayed.If fault message is displayed, pressing FLT FAULTS MODE switch/light displays its fault message diagnostic code. Alternate pressing YES/ADV switch and FLT FAULTS switch/light to displays each fault message and diagnostic code. Repeated pressing of the FLT FAULTS switch/light also causes the flight faults and diagnostic codes to be alternately displayed. If interface faults are displayed, the YES/ADV switch must be pressed to display the next fault. Interface faults do not have diagnostic codes.
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