IBM i 830 Repair Manual page 33

v Any twinaxial cables that are not attached to devices must be removed.
v The lengths and numbers of connections in the cables must be correct.
v Ensure that lightning protection is installed on any twinaxial cables that
enter or leave the building.
13. Review the service entries to determine what service actions were performed
on the system (see the "Appendix A. Problem Summary Form" on page 951).
14. Review the entries in the problem log (WRKPRB) and look for problems that
were reported to the user.
15. Review the entries in the Product Activity Log and look for a pattern:
v SRCs on multiple input-output processors (IOP) occurring at the same time
v SRCs that have a common "time of day" or "day of week" pattern
v Log is wrapping (hundreds of recent entries and no older entries)
Check the Product Activity Log sizes and increase them if they are smaller
than recommended.
16. Review the entries in the history log (Display Log (DSPLOG)) and look for a
change that matches the start of the intermittent problems.
17. Check your records and the service log to ensure that the latest engineering
changes are installed on the system and on all system I/O devices.
18. Ensure that the hardware configuration is correct and that the model
configuration rules have been followed
v Use the display hardware configuration service function (under SST or
DST) to check for any missing or failed hardware.
19. Was a manufacturing engineering service (MES), system upgrade, feature, or
any other field bill of material or feature field bill of material installed just
before the intermittent problems started occurring?
No Yes
↓
Review the installation instructions to ensure that each step was
performed correctly. Then continue with the next step of this
procedure.
20. Is the problem associated with a storage device?
No Yes
↓
Ensure that the customer is using the correct storage device cleaning
procedures and good storage media. Then continue with the next step
of this procedure.
21. Ensure that all the items in "Appendix B. Preventive Maintenance (PM)" on
page 953 are being performed regularly.
Performing the following helps prevent intermittent thermal checks:
v Ensuring that the AMDs on all disk units, tape units, and power supplies
are working
v Exchanging all air filters as recommended
22. If necessary, review the intermittent problems with your next level of support
and installation planning representative.
Ensure that all installation planning checks were made on the system. Because
external conditions are constantly changing, the site may need to be checked
again.
This ends the procedure.
Intermittent Problems
Chapter 1. Starting Problem Analysis
19