Unit 5-7

Front 1

(847) In the DBRITE system, a direct cable may be used to connect the composite video signal to the display at distances up to

Back 1

500 feet

Front 2

(848) What assembly in the power supply and junction (PS&J) box receives and multiplexes data to be sent to the digital scan converter?

Back 2

Logic board

Front 3

(848) Which of these boards is in each digital scan converter (DSC)

Back 3

interface, PPI, synthetic

Front 4

(848) On the tower display, the built in test (BIT) target is always located at

Back 4

56 nautical miles and at 1 of 8 azimuths selectable at 45 degree increments

Front 5

(848) What DBRITE display assembly applies the video signal to the cathode of the CRT?

Back 5

video driver

Front 6

(849) What data level does the digital scan converter (DSC) and power supply and junction (PS&J) box use?

Back 6

RS-422

Front 7

(850) when a built- in- test (BIT) function detects a circuit failure, an error code than corresponds to the failure is shown on

Back 7

the displays that are served by the same DSC as the faulty unit

Front 8

[847] What two sets of equipment make up the DBRITE system and what does each consist of?

Back 8

(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.

Front 9

[847] How is the composite video signal generated?

Back 9

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.

Front 10

[847] What is the purpose of the keyboard and PEM?

Back 10

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.

Front 11

[848] What is the purpose of the Power Supply & Junction (PS&J) box?

Back 11

It is used as a power source and the interconnection point for other DBRITE operator control equipment.

Front 12

[848] The Power Supply & Junction (PS&J) box power supply provides DC power to which assemblies?

Back 12

(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)

Front 13

[848] What functions are performed by the PS&J box logic board?

Back 13

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.

Front 14

[848] List the functions tested by the logic boards on-line Built-In Test (BIT).

Back 14

(1) Analog multiplexing
(2) A/D converter handling of the PEM inputs
(3) Voltages from the power supply unit.

Front 15

[848] List the components of each Digital Scan Converter (DSC).

Back 15

(1) Interface board(s)
(2) Plan-Position Indicator (PPI) board
(3) Synthetic board
(4) Control panel
(5) DC power supply

Front 16

[848] What happens when the BIT TEST switch is set to the BIT position?

Back 16

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.

Front 17

[848] How many tower display units can be driven by a Digital Scan Converter (DSC)?

Back 17

4

Front 18

[848] Where are the sync signals separated from the video?

Back 18

In the video sync assembly.

Front 19

[848] List the components of the deflection assembly.

Back 19

(1) Horizontal and vertical sweep generators.
(2) Deflection amplifiers
(3) Dynamic focus correction circuitry
(4) Amplifiers that drive the dynamic and static focus coils.

Front 20

[849] What's the purpose of the Remote Interface Adapter (RIA)?

Back 20

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.

Front 21

[849] What determines which type Remote Control Unit (RCU) is used?

Back 21

The automation system that's connected to the Digital Scan Converter (DSC) cabinet.

Front 22

[849] All operating voltages required by the keyboard and Position Entry Module PEM are furnished by what assembly?

Back 22

The Power Supply & Junction (PS&J) box.

Front 23

[850] What are the two functional elements of the BIT feature?

Back 23

On-line and Off-line

Front 24

[850] Which BIT doesn't require you to intervene during diagnostic tests on an operational DBRITE system?

Back 24

On-line

Front 25

[850] When an internal error is detected on the synthetic board during on-line BIT, what's the probable cause?

Back 25

A severe malfunction with the microprocessor.

Front 26

[850] What is the sequence of tests during off-line BIT?

Back 26

The synthetic board is tested, then the interface board, and finally the PS&J box.

Front 27

[850] After a test sequence diagnostic display, what step mist be taken before continuing the tests?

Back 27

The BIT ADV switch on the DSC maintenance panel must be pressed.