Installation guide

8.2 Troubleshooting the Magazine Tape Subsystem
Table 8–3 (Cont.) Fault Matrix
Minor FRU Possible Failure Scenario
Power Supply Assembly When connected to a known good source of
power, and power switch is set to ON, the unit
does not power up and the Power indicator
remains off.
Operator Control Assembly After replacing either a faulty controller module
or other FRU, either the OCP buttons or
indicators do not function.
All indicators do not come on briefly at power
on.
Fan Visual Inspection Required.
This section describes error conditions, failure influences, soft error rates, and
how to run an error log code. See Table 8–4 for a list of common failures,
causes, and fixes.
8.2.3 Error Conditions
The word error is sometimes misunderstood. Recoverable (soft) errors are a
fact of life in the tape world. There are many reasons why a soft error can
occur.
The tape media is not perfect, drive heads eventually wear out and start
producing higher error rates, heads can become contaminated, or foreign debris
can pass through the tape path. If you examine the drive error count, you will
see soft errors, events, and hard errors. For example, you will receive an error
if you give the wrong label name during a mount. Be sure the errors you are
interpreting are indicative of a real hardware problem before swapping out the
drive.
8.2.4 Common Failure Influences
The tape ISE may appear to be the failing unit due to the operation being
performed at the time of failure (such as back-up). However, it is important to
understand that there are many factors that influence failures.
Some of the more common factors are:
• Defective media
• Operator or user errors
• Incorrect back up commands
8–14 Installation Troubleshooting