R400X Expander Installation and Maintenance

This document is the R400X Expander Installation and Maintenance manual, published by Digital Equipment Corporation in December 1990.

It serves as a comprehensive guide for installing, maintaining, and understanding the R400X Expander, a mass storage expansion unit designed for VAX 4000, DECsystem, and Q-bus MicroVAX systems.

Key aspects covered include:

• Description (Chapter 1): Detailed overview of the R400X Expander, its components like mass storage areas (supporting up to 7 Integrated Storage Elements (ISEs) or 6 ISEs plus a TLZ04 tape drive), backplane, DSSI (Digital Storage System Interconnect) and SCSI (Small Computer System Interface) connections, power supply (including shutdown sequences and indicators), fan tray, and status panel.
• Installation (Chapter 2): Step-by-step instructions for setting up the expander, from site preparation and unpacking to positioning, configuring DSSI and SCSI buses, installing storage devices, connecting various power and data cables, and initial system power-up.
• FRU Removal and Replacement (Chapter 3): Procedures for removing and replacing Field-Replaceable Units (FRUs), such as ISEs, tape drives, power supplies, fans, and backplanes, with emphasis on critical safety warnings (e.g., electrical shock, static discharge).
• Appendices: Additional information on DSSI cabling for older BA200-series enclosures and detailed procedures for programming internal parameters of RF-series ISEs (like Bus Node ID, allocation class, and unit numbers) for proper system integration and identification.

The manual is intended for Digital Customer Services personnel and qualified self-maintenance customers.