IBM 6150 Hardware Maintenance Manual page 108

TNL SN20-9850 (05-87) to 75X0152 or 75X0166
CEx
DMA Channel Error - - - - - - - - - - - - - - - - - - ,
This SRA number is generated from an error log entry. A DMA
channel error occurred. The failing DMA channel should be listed
in the error log entry used to generate this SRA number.
Using the error log, find the DMA channel number, then isolate the
problem to a FRU that uses that DMA channel.
Run the System Checkout to check any repairs.
CFx
I/O Channel Error - - - - - - - - - - - - - - - - - - - ,
This SRA number is generated from an error log entry. An I/O
channel error occurred. This error can be caused by any adapter
installed in the system or the system board.
Run the System Checkout to isolate the failure. If a failure is not
detected, suspect any AT 512 KB Memory Expansion Options
installed.
Run the System Checkout to check any repairs.
DIx
Data Link Problem - - - - - - - - - - - - - - - - - ,
This SRA number indicates a communication link problem.
(5/87) Problem Isolation Charts 3-0020-39