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EQUIPMENT.
CDS - DISPLAY UNIT
EFFECTIVITY
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CAUTION: DO NOT USE ABRASIVE MATERIALS WHEN YOU
CLEAN THE DISPLAY SURFACE. DO NOT TOUCH
THE DISPLAY SURFACE WITH YOUR SKIN. THERE
IS AN OPTICAL COATING ON THE DISPLAY
SURFACE. YOUR SKIN OR ABRASIVE
MATERIALS WILL CAUSE SCRATCHES IN THE
OPTICAL COATING.
NOTE: Remove the conductive plastic covers from the
connectors before you install a DU.
CDS - DISPLAY UNIT
EFFECTIVITY
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CDS - DISPLAY UNIT
CDS - DISPLAY UNIT
EFFECTIVITY
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THIS PAGE IS INTENTIONALLY LEFT BLANK
CDS - DISPLAY UNIT
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Display Unit
The display unit (DU) is a flat panel liquid crystal display (LCD)
unit. The LCD makes a high resolution color image of the flight
data.
DU Rear Connector
All electrical interfaces go through the DU rear connector. The
graphic generators in the DEU send display data to the DUs.
The DUs send temperature, light intensity levels, and BITE data
to the DEUs.
The rear connector also has HIRF protection.
Interconnect Board
The interconnect board applies all power, grounds, and signals
necessary for transmission between functions.
EMI Filter
The +28v dc input power goes through the EMI filter before it
goes to the interconnect board.
Power Supply
The power supply supplies all the DU internal voltages except
for the LCD and heater voltages. The power supply converts
+28v dc into +5v, +/-15v, +30v, and +375v.
Input/Output Controller
The input/output controller (IOC) controls all digital data into
and out of the DU. This includes the graphics image data from
the DEU, the discrete data input for display unit identification,
and the ARINC 429 bus output.
The IOC also does the BITE functions for the DU.
Beamformer
The beamformer decompresses the graphics image data from
the DEU to graphics image data for the LCD interface.
LCD Interface
The LCD interface changes image data to digital voltages.
Voltage Reference
The voltage reference changes the digital voltage values from
the LCD interface to analog voltage reference (VREF) voltages.
The VREF voltage is a voltage that the LCD drivers use to
control the image element on the LCD for different intensities.
LCD Drivers
The LCD drivers control the 1152 X 1152 color dots that make up
the display.
CDS - DU - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Backlight Driver Assembly
The backlight driver assembly controls a single fluorescent
lamp. It also controls the lamp and LCD heater circuits. The
backlight driver assembly keeps the lamp temperature at 60C.
And the backlight driver assembly keeps the temperature for
the LCD above 25C.
Lamp Assembly
The lamp assembly has a back surface to reflect the fluorescent
lamp to increase the light output. It also has temperature
sensors. When the lamp and LCD temperature are out of range,
the backlight driver assembly adjusts the temperature.
Bezel Light Sensor
The bezel light sensor (BLS) senses incident light. The
interconnect board changes the BLS signal to a digital value.
This value goes on the ARINC 429 buses back to the DEU for
light intensity control.
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EFFECTIVITY
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CDS - DU - FUNCTIONAL DESCRIPTION
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EFFECTIVITY
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