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System/370 Model 195 (cont'd)
Hardstop
Option
If both wait and system lights are off, possible hardstop may
be
assumed. The hard·
stop procedure should be used only at the recommendation of the serviceman.
1.
Set MACH CHECK STOP to HARD STOP and leave in this position; the test
light remains on. The CPU hard stops on each machine check.
2.
At stop time, record all check lights that are turned on; save information for
the service personnel.
3.
Perform storage error analysis.
4.
I f analysis shows main storage failure, perfonn procedure in "Storage
Failure." At the completion of storage reconfiguration, notify the service
personnel.
Press SYSTEM RESET.
b.
Restore MACH CHECK STOP to center (nonnal) position.
c.
Perform manual IPL of control program; continue processing.
5.
If analysis shows buffer failure, perfonn procedure in "Buffer Failure." At
the completion of buffer failure procedure, notify the service personnel.
a.
Press CPU RESET.
b.
Set MACH CHECK STOP to PROCESS.
Press FORCE MACH CHK.
d.
Set MACH CHECK STOP to HARD STOP.
e.
Press START to resume processing in hardstop option.
6.
If analysis shows neither main storage nor buffer storage has failed.
a.
Set MACH CHECK STOP to PROCESS.
b.
Press START.
Set MACH CHECK STOP to HARDSTOP.
NOTE:
See Source SRL for description of "Storage Failure" and "Buffer Failure"
procedures.
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