Preface
This manual provides service and diagnostic procedures for DECmpp 12000/Sx
systems. Anyone who services DECmpp 12000/Sx Series systems or needs to
replace any items should read this manual and be familiar with the procedures.
Intended Audience
This guide is for use by Digital Services personnel and by self-maintenance
customers who will be servicing the DECmpp 12000 and DECmpp 12000–LC
systems.
Document Structure
The DECmpp 12000/Sx Hardware Service Manual contains seven chapters and
two appendixes.
•
Chapter 1 is a system overview and contains the power-up and power-down
routines for both the data parallel unit (DPU) and the front-end server.
•
Chapter 2 describes the DPU switches, controls, indicators, and the DPU
power system.
•
Chapter 3 describes the DPU power supply settings and how to adjust them,
if necessary.
•
Chapter 4 describes the DECmpp 12000/Sx system cables, connectors, and the
printed circuit boards (PCBs) outside the DPU card cage.
•
Chapter 5 describes the diagnostic software provided, how to use it, and how
to interpret the results.
•
Chapter 6 explains the procedures for removing and replacing the DPU
components.
•
Chapter 7 explains the procedures for upgrading the DECmpp 12000/Sx
Series systems by adding more processor element (PE) array PCBs.
•
Appendix A lists all of the recommended spare parts for the DPU.
•
Appendix B is a collection of Reference Pages that apply to the DPU.
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