Unit 5-7
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- (847) In the DBRITE system, a direct cable may be used to connect the composite video signal to the display at distances up to
- 500 feet
- (848) What assembly in the power supply and junction (PS&J) box receives and multiplexes data to be sent to the digital scan converter?
- Logic board
- (848) Which of these boards is in each digital scan converter (DSC)
- interface, PPI, synthetic
- (848) On the tower display, the built in test (BIT) target is always located at
- 56 nautical miles and at 1 of 8 azimuths selectable at 45 degree increments
- (848) What DBRITE display assembly applies the video signal to the cathode of the CRT?
- video driver
- (849) What data level does the digital scan converter (DSC) and power supply and junction (PS&J) box use?
- RS-422
- (850) when a built- in- test (BIT) function detects a circuit failure, an error code than corresponds to the failure is shown on
- the displays that are served by the same DSC as the faulty unit
- [847] What two sets of equipment make up the DBRITE system and what does each consist of?
-
(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. - [847] How is the composite video signal generated?
- 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.
- [847] What is the purpose of the keyboard and PEM?
- 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.
- [848] What is the purpose of the Power Supply & Junction (PS&J) box?
- It is used as a power source and the interconnection point for other DBRITE operator control equipment.
- [848] The Power Supply & Junction (PS&J) box power supply provides DC power to which assemblies?
-
(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) - [848] What functions are performed by the PS&J box logic board?
- 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.
- [848] List the functions tested by the logic boards on-line Built-In Test (BIT).
-
(1) Analog multiplexing
(2) A/D converter handling of the PEM inputs
(3) Voltages from the power supply unit. - [848] List the components of each Digital Scan Converter (DSC).
-
(1) Interface board(s)
(2) Plan-Position Indicator (PPI) board
(3) Synthetic board
(4) Control panel
(5) DC power supply - [848] What happens when the BIT TEST switch is set to the BIT position?
- 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.
- [848] How many tower display units can be driven by a Digital Scan Converter (DSC)?
- 4
- [848] Where are the sync signals separated from the video?
- In the video sync assembly.
- [848] List the components of the deflection assembly.
-
(1) Horizontal and vertical sweep generators.
(2) Deflection amplifiers
(3) Dynamic focus correction circuitry
(4) Amplifiers that drive the dynamic and static focus coils. - [849] What's the purpose of the Remote Interface Adapter (RIA)?
- 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.
- [849] What determines which type Remote Control Unit (RCU) is used?
- The automation system that's connected to the Digital Scan Converter (DSC) cabinet.
- [849] All operating voltages required by the keyboard and Position Entry Module PEM are furnished by what assembly?
- The Power Supply & Junction (PS&J) box.
- [850] What are the two functional elements of the BIT feature?
- On-line and Off-line
- [850] Which BIT doesn't require you to intervene during diagnostic tests on an operational DBRITE system?
- On-line
- [850] When an internal error is detected on the synthetic board during on-line BIT, what's the probable cause?
- A severe malfunction with the microprocessor.
- [850] What is the sequence of tests during off-line BIT?
- The synthetic board is tested, then the interface board, and finally the PS&J box.
- [850] After a test sequence diagnostic display, what step mist be taken before continuing the tests?
- The BIT ADV switch on the DSC maintenance panel must be pressed.