737-600/700/800/900 TRAINING MANUAL
MAIN PANEL
UPPER CENTER CONTROL
LOWER CENTER
INBD DU OUTBD DU
BRT BRT
CONTROL OVERALL
LOWER
CENTER
CONTROL
WXR/TERR FIRST OFFICER BRIGHTNESS CONTROL PANEL
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CDS - BRIGHTNESS CONTROLS
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737-600/700/800/900 TRAINING MANUAL
CDS -- DISPLAY ELECTRONICS UNIT General
The common display system has two display electronics units (DEUs). The DEUs do these functions:
-Collect data from airplane systems -Change the data to a video signal to show on the display units -Send data to other airplane systems.
The DEU monitors the presence, status, and validity of inputs and compares inputs with the other DEU.
Physical Description
The DEU is an 8-MCU enclosure. The DEU is approximately 10 inches (25.4 cm) wide, 7.5 inches (19 cm) tall, and 15 inches (38 cm) deep.
The DEU weighs approximately 31.5 pounds (14.3 kg).
Rear Connector
On the rear of the DEU there are electrical connectors. There are letters next to each connector. You can get access to the data at these connectors through CDS BITE for the discrete input monitoring function.
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737-600/700/800/900 TRAINING MANUAL
A
D
B
E
C
F
CONNECTORS
REAR VIEW
CDS - DISPLAY ELECTRONICS UNIT
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ALTEON PROPRIETARY - Copyright (c) - See title page for details
CDS -- DEU - FUNCTIONAL DESCRIPTION General
The display electronic unit (DEU) collects data from other airplane systems and changes the data to a video signal that goes to the display units (DU). The DEU also sends some airplane system data to other systems.
The DEU has nine circuit card assemblies. They are not line replaceable units. These are the cards in the DEU:
-Two input/output controller (IOC) and ARINC 429
input/outputs (I/O)
-Two discrete input/outputs (I/O)
-One analog input/output (I/O)
-One processor
-Two graphics generators
-One power supply.
Input/Output Module
There are two input/output modules (IOM) per DEU. One IOM has three circuit card assemblies (CCA), and the other has two CCAs. The primary circuit card assembly in each IOM is the input/output controller (IOC). There is also a analog discrete input/output CCA in each IOM and one analog signal input/output CCA in one of the IOMs.
Input/Output Controller
The IOC controls the inputs and outputs to the DEU and it also has the ARINC 429 input/output function. The IOC function gives the interface between the
737-600/700/800/900 TRAINING MANUAL
input/output CCAs through the input/output (I/O) bus and the backplane bus. The ARINC 429 input/output function controls 39 receivers and 12 transmitters for the ARINC 429 buses.
Some digital inputs to the DEUs go to the two IOMs for integrity requirements. A comparison is done between the IOMs to make sure the data is correct.
Analog Discrete I/O CCA
There are two analog discrete I/Os. Each discrete I/O supplies an interface for 108 discrete inputs and 24 discrete outputs. One hundred inputs connect to ground or are open, and eight connect to 28v dc or are open. Twenty outputs connect to ground or are open, and four connect to 28v dc or are open. The IOC is the interface between the analog discrete CCAs and the processor.
Analog Signal I/O CCA
There is one analog signal I/O. The analog I/O supplies an interface for 21 analog inputs and 4 analog outputs. The inputs are:
-Tachometer signals
-DC voltage signals
-DC current signals
-AC voltage signals.
The outputs are dc voltage signals. The IOC is the interface between the analog signal CCA and the processor.
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CDS -- DEU - FUNCTIONAL DESCRIPTION Processor
The processor receives data from and sends data to the IOC function over the backplane bus. There are two microprocessors that are the same in the processor. The microprocessors do the same operation and use the same software from the memory. The processor compares the output from the microprocessors. If the data is not the same, there is a failure in the processor.
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