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B. De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002).
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MULTIFUNCTION PRINTING (PRINTER) - DESCRIPTION AND OPERATION
____________________________________________________________
1. General
_______
**ON A/C 001-049, 051-099, 101-102,
The printer (PRTR) is designed to achieve the print out on "high contrast
low abrasive" paper of reports coming from various systems such as ACARS,
AIDS, FMGC, CFDIU, EVMU either on ground or in flight.
Simple "one hand" in flight or on ground paper roll loading allows 90 feet
printing, 3 rolls being stowed on the left rear cockpit wall.
R **ON A/C 103-149, 151-199, 201-299, 301-399, 401-499,
The printer (PRTR) is designed to achieve the print out on "high contrast
low abrasive" paper of reports coming from various systems such as AIDS,
FMGC, CFDIU, EVMU either on ground or in flight.
Simple "one hand" in flight or on ground paper roll loading allows 90 feet
printing, 3 rolls being stowed on the left rear cockpit wall.
**ON A/C ALL
2. Component Location
__________________
(Ref. Fig. 001)
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF. -------------------------------------------------------------------------------4TW PRINTER 11VU 211 831 31-35-22
3. System Description
__________________ The thermal line PRINTER provides on board print outs for various aircraft systems, one at a time. When power is applied, the PRINTER determines which inputs are active and which specific system is connected to each active port. Also after a sequence of active port polling, a single inactive port is monitored so that a system which became active after initialization can be added to the active system list.
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Printer - Component Location
Figure 001
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The PRINTER then switches on each system in order of their priorities (port one has the highest priority, port 12 has the lowest one) and using a hand shake protocol asks the systems for a data transfer. These data are formatted within each system (including the parity bit) and are transmitted on low speed buses. The printer provides a storage capability of 8 kbytes and is able to generate 120 forty character lines per minute. After printing the last message block the paper is advanced automatically. The PRINTER recognizes the printable ASCII character set and several control characters, and is capable to print 80, 64 or 40 characters per line formats, the 80 characters per line by 24 lines being printed in the Y axis.
4. Power Supply
____________
(Ref. Fig. 002)
The printer is supplied from the busbar via a circuit breaker.
-------------------------------------------------------------------------------| Voltage | Busbar | C/B | Power Consumption | Transient treatment | -------------------------------------------------------------------------------| 115 VAC | 101 XPA | 6TW | 55 W at max print rate | 250 ms transparency | -------------------------------------------------------------------------------| 5VAC | | | 15 W in idle mode | 2 mn buffer storage | -------------------------------------------------------------------------------
5. Interface
_________
(Ref. Fig. 002)
A. Output parameters The table below contains all the output parameters in the digital form. They are sorted as per the numerical order of their output label. This table gives:
-SYS LABEL SDI: PRINTER output label for which the parameter is available
-PARAMETER DEFINITION: parameter name
-RANGE ACCURACY: measurement range. Maximum value transmitted. When the digital value changes, the change step is equal to the accuracy
-UNIT: unit in which the digital value is transmitted
-SIG BIT: indicates whether a sign bit is available
-DATA BITS: number of bits used by the parameter in the label
-UPD/MSEC: output transmission interval. The refresh rate is given in milliseconds
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