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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
31-62-00-204
General
Two brightness control panels are below the captain and first
officer displays. The panels set the manual brightness of the
displays. The controls for the inboard DUs and the lower center
DU are dual controls. The larger knob controls the overall
brightness of the DU. The small knob controls the weather radar
(WXR) or the terrain display relative brightness when the WXR
or enhanced ground proximity warning system terrain display
is on.
CDS - BRIGHTNESS CONTROLS
EFFECTIVITY
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CDS - BRIGHTNESS CONTROLS
CDS - BRIGHTNESS CONTROLS
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
31-62-00-207
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 cross 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 use these letters for
CDS BITE discrete input monitoring.
CDS - DISPLAY ELECTRONICS UNIT
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CDS - DISPLAY ELECTRONICS UNIT
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The DEU collects data from other airplane systems and
changes the data to a video signal. 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.
When a card fails, there are maintenance messages that show.
IOC and ARINC 429 I/O
There are two IOC and ARINC 429 I/Os. Each IOC and ARINC
429 I/O has two functions. The ARINC 429 input/output function
has 39 receivers and 12 transmitters for the ARINC 429 buses.
The IOC function formats all the input data to transmit on the
backplane bus to the processor.
Discrete I/O
There are two discrete I/Os. Each discrete I/O supplies an
interface for 108 discrete inputs and 24 discrete outputs. These
inputs are digitized and sent on the I/O bus to the IOC function.
The IOC function sends data back on the I/O bus for the discrete
I/O to send outputs.
Analog I/O
There is one analog I/O. The analog I/O supplies an interface
for 21 analog inputs and 4 analog outputs. The inputs are
digitized and sent on the I/O bus to the IOC function. The IOC
function sends data back on the I/O bus for the analog I/O to
send outputs.
Processor
The processor receives data from and sends data to the IOC
function over the backplane bus. There are two identical
microprocessors in the processor. The microprocessors do the
same operation and use the same software from the memory.
The processor compares the output from both microprocessors.
If the data is not the same, there is a failure in the processor.
The processor also compares critical data that comes from the
　
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