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737-600/700/800/900 TRAINING MANUAL CDS -- TRAINING INFORMATION POINT - MAINTENANCE MESSAGES
CDS Messages
These are the CDS messages that can show:

- INSTR SWITCH 
- DSPLY SOURCE 
- CDS MAINT 
- CDS FAULT. 

INSTR SWITCH Message
The INSTR SWITCH message shows when the captain and first officer displays use the same source for inertial reference data. This message shows on the captain and the first officer PFD.
DSPLY SOURCE Message
The DSPLY SOURCE message shows when all the display units get data from one DEU. This occurs when the display source selector is in the ALL ON 1 or the ALL ON 2 position.
After both engine are on, this message also shows when a DEU failure causes all the DUs to get data from one DEU. On the ground with the engines off, the CDS FAULT message replaces the DSPLY SOURCE message. The DSPLY SOURCE message does not replace CDS FAULT when the hot battery bus power is not available because both DEUs are still operating. The DSPLY SOURCE message does not replace CDS FAULT when the data load switch is in the DEU 1 or DEU 2 position. This is because the DEUs only load software on the ground when at least one engine is not running. If you have this fault and start both engines, the DEUs ignore the data loader and become operational.
This message shows on the captain and the first officer PFD.
CDS MAINT Message
The CDS MAINT message shows when one of these circuit cards fails in either DEU:
-Graphic generator
-Discrete input/output
-Analog input/output.
This message shows on the captain and the first officer PFD.
This message shows only when the airplane is on the ground and at least one engine is off.
CDS FAULT Message
The CDS FAULT message shows when there is a total DEU failure. A total DEU failure is when any one of these circuit cards fails:
-Input/output controller and ARINC 429 input/output -Power supply -Processor.

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CDS -- TRAINING INFORMATION POINT - MAINTENANCE MESSAGES
The CDS FAULT message shows if two or more of these circuit cards fail in a DEU or any one fails in both DEUs:
-Graphic generator
-Discrete input/output
-Analog input/output.

The CDS FAULT message shows if the DEU initializes and it detects that any of these are not compatible:
-Program pins in DEU 1 and DEU 2
-OPS and airplane type
-OPS and OPC
-OPC and OPS in DEU 1 and DEU 2.

For these conditions, the CDS FAULT message shows and is removed when both engines start:
-Hot battery power is not available when the DEU
initializes
-Data loader switch is in the DEU 1 or DEU 2
position.

The CDS FAULT message shows if there is a miscompare of the N1, N2, or EGT data between DEU 1 and DEU 2.
This message shows on the captain and the first officer PFD.
The CDS FAULT message shows only when the airplane is on the ground and at least one engine is off.

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INSTR SWITCH  INERTIAL REFERENCE DATA FROM SAME SOURCE 
CDS MAINT  PARTIAL DEU FAILURE 
CDS FAULT  DEU FAILURE OR BOTH DEU(S) HAVE A PARTIAL FAILURE OR INCOMPATIBLE S/W OR H/W OR MISCOMPARE OF CRITICAL DATA OR HOT BATTERY BUS NOT AVAILABLE OR DATA LOAD SWITCH IN DEU 1 OR DEU 2 POSITION (FOR HOT BATTERY BUS OR DATA LOAD SWITCH, CDS FAULT IS REMOVED WHEN BOTH ENGINES START.) 
DSPLY SOURCE  SHOWS AFTER 2ND ENGINE STARTED FOR A CDS FAULT: DEU FAILURE, BOTH PARTIAL FAILURE, INCOMPATIBLE S/W OR H/W, OR CRITICAL DATA MISCOMPARE OR WHEN YOU SELECT ALL ON 1 (2). 

CDS - TRAINING INFORMATION POINT - MAINTENANCE MESSAGES
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CDS -- TRAINING INFORMATION POINT - SOFTWARE LOADING
DEU Software
You can do a DEU software load or do a download of DEU BITE data. These are the types of software you can put in the
DEUs: -Operational software -Operational program configuration
-Display unit data base. Operational Software (OPS) The operation software is the software that operates
the DEU.

A maximum of 90 minutes is necessary to do a load of the
OPS into each DEU.
　
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