737-600/700/800/900 TRAINING MANUAL CDS -- ENGINE INTERFACES - 5 Engine Ignition Selector
The engine ignition switch sends two ground discretes to the display electronic units (DEUs). These discretes show the position of the engine ignition switch (L IGN, BOTH, or R IGN). The DEUs send this data to the engine electronic controls (EEC) on the EEC/APU buses.
Engine Start Valve
The engine start valves send a ground discrete to the DEUs when the valve is in the open position. The DEUs use this data for the START VALVE OPEN indication on the center display units (DUs). This data also goes to the EECs on the EEC/APU buses.
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DEU 1

IGN SW - LEFT
IGN SW - RIGHT
SWITCH ENG 1 START VALVE

ENG 2 START VALVE DEU 2
CDS - ENGINE INTERFACES - 5
ENG 1 START VALVE
ENG 2 START VALVE

IGN SW - LEFT IGN SW - RIGHT

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737-600/700/800/900 TRAINING MANUAL CDS -- ENGINE INTERFACES - 6 Engine Alternate Power Relay
The display electronic units (DEUs) send ground discretes to the engine alternate power relays. The relays supply electrical power from the transfer buses to the engine electronic controls (EECc).
The DEUs send the engine alternate power discretes when one of these is true:
-Engine start lever is set to idle
-Engine start switch is set to GRD
-Engine start switch is set to CONT
-Control display unit (CDU) set to engine BITE.
Engine Running Relay
The DEUs send the ground discretes to the engine running relays. These relays supply engine running status to other airplane systems.
The DEUs send the engine running discretes when one of these is true:
-EEC digital discrete is set to run
-N2 is í50% RPM
-Engine start lever is set to idle for 5 minutes.

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CDS - ENGINE INTERFACES - 6
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737-600/700/800/900 TRAINING MANUAL CDS -- COAX COUPLER General
There are four coaxial couplers. Each display electronic units (DEU) graphics generator circuit card assembly (GG CCA) transmits image data to one of the coax couplers. Each DEU has two GG CCAs.
The coax coupler is a one-to-six splitter. The six outputs of the coax coupler connect to each of the six display units.
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COAX COUPLER (FRONT VIEW)
COAX COUPLER (REAR VIEW)
CDS - COAX COUPLER
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737-600/700/800/900 TRAINING MANUAL CDS -- REMOTE LIGHT SENSOR General
Two remote light sensors (RLSs) are on the top forward part of the glareshield. The sensors point forward. The RLSs measure ambient light with a photodiode sensor. The output voltage (0 - 8v) is proportional to the ambient light. Power for the RLSs comes from the related onside outboard display units (DU).
The left RLS sends the output signal to the left outboard DU. The right RLS sends the output signal to the right outboard DU. The DUs change these signals into ARINC 429 format and send them to the display electronic units (DEU).
The DEU uses these inputs with other manual and automatic inputs to calculate the brightness value for all the DUs.
Physical Description
Each sensor weighs less that 1/2 pound. The RLS has a field of view of 70 degrees left, 70 degrees right, 40 degrees up and 15 degrees down.
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CDS -- DISPLAY UNIT General
The common display system uses six flat panel, liquid crystal display (LCD) units that are the same. The display units (DUs) show this type of information:
-Primary flight information
-Navigation information
-Engine information.
Physical Description
The DUs are on a rack. The DUs are 8 inches (20.3 cm) by 8 inches and are 9.75 inches (24.8 cm) deep. Each DU weighs approximately 18 pounds (8.2 kg).
There is a bezel light sensor (BLS) at the bottom edge of the face plate.
Internal Temperature Detectors
Each DU has internal temperature detectors. If the internal temperatures get too hot, the DU goes off. There are two temperature detectors.
If the temperature in the DU power supply is 110C or more, the DU goes off. If the temperature at the backlight assembly is 95C or more, the DU goes off. When the DU temperature decreases, it comes back on again.
The left outboard, left inboard, and lower center display units use blow-through cooling. The right
　
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