-Interface board
Twelve ARINC 429 inputs, protected against voltage transients are
multiplexed to one single LSI input, which performs all encoding and
decoding functions.
Software controls all selection and multiplex logic.
The low speed ARINC 429 output is buffered with two high current
operational amplifiers which can drive twenty loads.
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Printer driver board The printer driver board contains all the high current drivers for both the print head and stepper motor, and provides interconnect between the power supply, print head, stepper motor, door opening and paper out switches and the printer controller board.
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Printer controller board The printer controller board is the heart of the printer containing all CPU (Intel 8031 single ship CMOS microprocessor with 9.8 MHz clock input), 5 volt monitor circuit, auto reset circuit, memory (64 kbytes of program memory, 16 kbytes of buffer memory), fault diagnosis circuitry, A/D converters.
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Printer - Internal Block Diagram
Figure 003
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7. Operation
_________
A. Paper The printer is loaded with a 90 feet paper roll (2.1 inches X 4.375 inches), which can be inserted via an access door incorporated in the front panel. A mechanical cutting device in the printer ensures a clean non-jamming paper cut. Upon receipt of the last message block, the printer advances a sufficient number of lines so that the last line of the printed message is not damaged by cutting the paper.
B. Paper Loading Procedure Unlatch and open the printer front door, press paper spool sideways until the spool is free to rotate outward, slide empty paper off spool, slide new paper roll on to the spool so the paper unrolls. Rotate the spool back to closed position, feed end of paper over roller and through paper path indicated by paper decals until the paper extends slightly through the paper cutter on front of the printer door, close and latch the door, press the SLEW switch to feed approximately 3 inches of paper beyond the cutter, tear off paper.
C. Reports Print-out Rules for report print-out initialization are specific for each system. (CFDIU, FMGS, EVMU, AIDS-DMU if fitted and ACARS if fitted).
8. Test
____
A. Functional Test The functional test is not available on the A/C but only at the shop. Momentarily grounding the functional test discrete input causes the printer to output at the maximum rate the first 40 characters of the ASCII set. Grounding the alert reset discrete while momentarily grounding the functional test discrete causes a long maintenance test pattern to print-out.
B. Monitoring The printer provides continuous monitoring of critical internal parameters. These monitoring operations are performed under microprocessor control or respective circuitry :
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monitoring operation of no buffer overrun
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monitoring of no inhibit mode
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monitoring of door closed
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monitoring of no out of page
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monitoring of internal circuitry (memory, A/D converter, ARINC transmitter and receiver...)
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monitoring of power supply circuitry
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-monitoring of operating temperature
The result of the fault diagnosis software function is indicated:
-via an hexadecimal LED digit indicator located on the printer controller board (for shop use only)
-to the CFDIU. In case of malfunction leading to an incapability to achieve any print-out, the PRINTER transmits a message (label 356) on ground and in flight, as long as the defect is present.
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MULTIFUNCTION PRINTING (PRINTER) - ADJUSTMENT/TEST
__________________________________________________ TASK 31-35-00-710-001 Operational Test of the Printer
1.
Reason for the Job
__________________
Self Explanatory
2.
Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
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