Product data
Maintenance Analysis Procedures (MAPs)
Are You Using the Correct Book? Do not use this book if you are servicing a 2104
Model DL1 or TL1. For the correct book, see Related Publications in Appendix A.
Additional Information for RISC Systems.
These maintenance analysis procedures (MAPs) describe how to analyze a continuous
failure that has occurred in a 2104 containing one or more SCSI disk drive modules.
Failing field-replaceable units (FRUs) of the 2104 can be isolated with these MAPs.
How to Use these MAPs
Attention: Unless the using system needs to be switched off for some other reason, do
not switch off the using system when servicing the 2104 or any of its SCSI devices.
Power cables and external SCSI cables that connect the 2104 to the using system can
be disconnected while that system is running.
v To isolate the FRUs in the failing 2104, do the actions and answer the questions
given in these MAPs.
v When instructed to exchange two or more FRUs in sequence:
1. Exchange the first FRU in the list for a new one.
2. Verify that the problem is solved. For some problems, verification means running
the diagnostic programs (see the using-system service procedures).
3. If the problem remains:
a. Reinstall the original FRU.
b. Exchange the next FRU in the list for a new one.
4. Repeat steps 2 and 3 until either the problem is solved, or all the related FRUs
have been exchanged.
5. Do the next action indicated by the MAP.
v See “Lights and Switches” on page 5 for locations and descriptions of the lights and
switches.
Attention: Disk drive modules are fragile. Handle them with care, and keep them well
away from strong magnetic fields.
Chapter 2. Problem Determination Procedures 43