IBM TotalStorage SAN256N Director 2045-N16, Installation And Maintenance Manual, Page: 129 / 157

Appendix A. Data collection and troubleshooting
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Table 11. TSW problem indications, solution 2
Action Remove and reseat the board. Verify that the latch
mounting screws are tightened to the proper torque. If the
fault persists, try replacing it with another board. If this
works, it verifies that the board you replaced is faulty. Place
the failed board in an antistatic bag, and return it to IBM.
Heartbeat LED Blink Interval is Not Normal (Normal is On/Off Once per Second)
Problem Summary There has been a hardware failure.
Probable Cause The board may not be seated properly, or it may be faulty
Action Remove and reseat the board. Verify that the latch
mounting screws are tightened to the proper torque. If the
fault persists, try to determine the source of the fault by
interpreting the interval pattern of the Heartbeat LED (see
TCM/TFIO/TSW PROM boot blink codes and TCM/TFIO/
TSW board boot blink codes). Error conditions on the
board are indicated by a three-second delay when the LED
is not lit, followed by a specific distinctive rapid blink interval
rate pattern. Document your findings, and then replace the
board. Place the failed board in an antistatic bag, and
return it to IBM.
Table 10. TSW problem indications, solution 1 (Continued)
PWR OK LED is not lit