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MAINTENANCE MANUAL
(4)
The two LEDs on the bottom edge of the display window indicate the Keep-Alive-Power (KAP) circuit is powered. Lights are on when there is power to the MCDP, whether the MCDP is on or off. These lights are covered, so are not very visible.
(5)
Control Switches
(a)
There are seven front panel control switches. Three of the switches are lighted switches with front panel replaceable lamps. All are momentary switches.
(b)
The ON/OFF switch is a push ON/OFF light/switch. The switch initiates a power-up routine in the Central Processing Unit (CPU). The power-up routine initially lights the FAIL message in the ON/OFF switch. If the MCDP passes the self-test routine, the light turns off after 5 seconds.
(c)
The FLT FAULTS (flight faults) switch is a push-on light/switch. The lamp lights when the function is engaged. The FLT FAULTS switch commands the CPU to enter the LAST FLIGHT FAULT ROUTINE. The FLT FAULTS MODE switch/light is also used to display the flight fault diagnostic code of the non-interface flight fault displayed.
(d)
The GRD TEST (ground test) switch is a push-on light/switch. The lamp lights when the function is engaged. The GRD TEST switch commands the CPU to enter the ground test mode and initialize to the lowest available test number. The GRD TEST MODE switch/light is also used with ground test 30, CURRENT FAULT REPORT to display the ground fault diagnostic code of the non-interface ground fault displayed.
(e)
The UP (slew up) switch increments the test number in a sequential loop each time the switch is pressed. Holding the switch on slews the test numbers at the rate of four test numbers per second. Unused test numbers are automatically skipped.
(f)
The DOWN (slew down) switch decrements the test number in a sequential loop and slews at the same rate as the UP switch.
(g)
The YES/ADV (yes/advance) switch is used to respond to messages ending with a question mark (?). Pressing the YES/ADV button in response to the question engages the displayed flight fault mode or ground test. The advance is used to advance to the next flight fault or ground test step. The operator must press YES/ADV to advance to the next test step if -ADV is displayed at end of display message whether test step passes or not. If -ADV is not displayed at end of display message and the test does not automatically advance to the next test step, then that test step has failed and the operator must push YES/ADV to continue the test.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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(6)
(7)
(8)
757
MAINTENANCE MANUAL
(h) The NO/SKIP switch is to respond to messages ending with a question mark (?) when the operator does not want to display the particular flight faults or run the particular ground test. If the NO/SKIP switch is pressed in response to a question, then the MCDP will skip to the next test question. If the question is part of a sub-routine of a test then the MCDP will skip to the next sub-routine within that test if there are any. If NO/SKIP is pressed in response to a ground test message that does not end with a question mark, the MCDP will exit that ground test and display the next test listed on the front of the MCDP. The exit function of the NO/SKIP switch will not work if the message displayed is a fault message.
NOTE: The YES/ADV and NO/SKIP switch will not respond when the
____ MCDP displays in test 40, SET R BUS TO ISOL FOR 10 SEC.
The operating instruction plate is on the lower left side of the front panel. It contains the instructions for applying power and initializing the MCDP. It tells how to select each mode and respond to interrogative messages.The GROUND TEST Listing is located on the lower right and center of the front panel. It contains test numbers and corresponding names that can be selected. The ground tests are listed as LRU, SUPPORT, and SYSTEM groups.Internal Circuits
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