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27 Cards in this Set
- Front
- Back
(847) In the DBRITE system, a direct cable may be used to connect the composite video signal to the display at distances up to
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500 feet
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(848) What assembly in the power supply and junction (PS&J) box receives and multiplexes data to be sent to the digital scan converter?
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Logic board
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(848) Which of these boards is in each digital scan converter (DSC)
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interface, PPI, synthetic
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(848) On the tower display, the built in test (BIT) target is always located at
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56 nautical miles and at 1 of 8 azimuths selectable at 45 degree increments
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(848) What DBRITE display assembly applies the video signal to the cathode of the CRT?
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video driver
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(849) What data level does the digital scan converter (DSC) and power supply and junction (PS&J) box use?
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RS-422
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(850) when a built- in- test (BIT) function detects a circuit failure, an error code than corresponds to the failure is shown on
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the displays that are served by the same DSC as the faulty unit
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[847] What two sets of equipment make up the DBRITE system and what does each consist of?
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(1) Operational equipment consisting of the tower equipment and the equipment that interfaces with the radar and the ATC automation systems.
(2) Maintenance equipment that consists of a maintenance panel and maintenance monitor. |
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[847] How is the composite video signal generated?
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Aircraft range and azimuth PPI information is processed in the DSC. There the information is mixed with synthetic alphanumeric data to generate the composite video signal.
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[847] What is the purpose of the keyboard and PEM?
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The keyboard allows entry of data and commands, the PEM is primarily a two-axis control used to identify or position items on the display.
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[848] What is the purpose of the Power Supply & Junction (PS&J) box?
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It is used as a power source and the interconnection point for other DBRITE operator control equipment.
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[848] The Power Supply & Junction (PS&J) box power supply provides DC power to which assemblies?
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(1) The Remote Control Unit (RCU)
(2) The Display Control Panel (DCP) (3) PS&J box logic board (4) One or two keyboards and Position Entry Modules (PEMs) |
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[848] What functions are performed by the PS&J box logic board?
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It multiplexes data from the Remote Control Unit (RCU), Display Control Panel (DCP), and keyboard and Position Entry Module (PEM) before it's sent to the DSC for processing.
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[848] List the functions tested by the logic boards on-line Built-In Test (BIT).
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(1) Analog multiplexing
(2) A/D converter handling of the PEM inputs (3) Voltages from the power supply unit. |
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[848] List the components of each Digital Scan Converter (DSC).
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(1) Interface board(s)
(2) Plan-Position Indicator (PPI) board (3) Synthetic board (4) Control panel (5) DC power supply |
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[848] What happens when the BIT TEST switch is set to the BIT position?
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The DSC module is off-line, and is running the offline built-in test function--regardless of the setting on the maintenance panel VIDEO SELECT switch.
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[848] How many tower display units can be driven by a Digital Scan Converter (DSC)?
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4
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[848] Where are the sync signals separated from the video?
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In the video sync assembly.
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[848] List the components of the deflection assembly.
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(1) Horizontal and vertical sweep generators.
(2) Deflection amplifiers (3) Dynamic focus correction circuitry (4) Amplifiers that drive the dynamic and static focus coils. |
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[849] What's the purpose of the Remote Interface Adapter (RIA)?
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It provides a physical interface between a modem and a data cable either from the tower Power Supply & Junction (PS&J) box or from the Digital Scan Converter (DSC) cabinet.
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[849] What determines which type Remote Control Unit (RCU) is used?
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The automation system that's connected to the Digital Scan Converter (DSC) cabinet.
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[849] All operating voltages required by the keyboard and Position Entry Module PEM are furnished by what assembly?
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The Power Supply & Junction (PS&J) box.
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[850] What are the two functional elements of the BIT feature?
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On-line and Off-line
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[850] Which BIT doesn't require you to intervene during diagnostic tests on an operational DBRITE system?
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On-line
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[850] When an internal error is detected on the synthetic board during on-line BIT, what's the probable cause?
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A severe malfunction with the microprocessor.
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[850] What is the sequence of tests during off-line BIT?
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The synthetic board is tested, then the interface board, and finally the PS&J box.
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[850] After a test sequence diagnostic display, what step mist be taken before continuing the tests?
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The BIT ADV switch on the DSC maintenance panel must be pressed.
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