IBM 6151 Maintenance And Service Manual page 128

DBx
Autocall Interface Problem
This SRA number is generated from an error log entry. There
may be a problem with the interface to the automatic calling
unit.
F4x
Unidentified Processor Board
The progrsm detected a processor failure, however the
processor board could not be identified. Look at the processor
board and use the SRA number below for the processor type
you have. H needed, see Section 5.
• For the Processor Board, see BRA number 84x.
• For the Advanced Processor Board, see BRA number 8Ex.
• For the Enhanced Advanced Processor Board, see BRA
number l8x.
3-0020-50 Service Manual