RZxx Disk Drive Subsystem Pocket Service Guide

This document is the "RZ Series Disk Drive Pocket Service Guide," published by Digital Equipment Corporation in October 1993. It provides technical information and service procedures for various RZ series hard disk drives.

The guide covers:

• Introduction: Describes the RZ series drives as either 3.5-inch (RZ22 to RZ26B) or 5.25-inch (RZ55 to RZ73) Winchester SCSI disk drives, detailing their use with different systems, mounting orientations, and formatted capacities. It also outlines the service strategy for each model, indicating whether to replace the entire drive, drive module, or Head/Disk Assembly (HDA).
• Configurations: Explains that RZ drives are not internally terminated and provides detailed figures and tables for setting SCSI ID and other jumpers for each specific RZ model (e.g., RZ22, RZ23L, RZ24, RZ25, RZ26B, RZ55, RZ56, RZ57, RZ58, and RZ73).
• Troubleshooting: Emphasizes using system-based diagnostics and lists initial checks (power, connections, configuration, especially SCSI ID). It includes flowcharts to guide troubleshooting procedures for identifying faulty components.
• FRU (Field Replaceable Unit) Procedures: Provides step-by-step instructions, often with diagrams, for removing and replacing specific components like drive modules, bezels, or HDAs for different RZ models. It stresses the importance of antistatic precautions and correctly setting SCSI ID jumpers to match the replaced unit.
• Recommended Spare Parts: Lists major FRUs (entire drives, HDAs, drive modules) and ID jumpers with their corresponding part numbers.

Overall, the document serves as a practical guide for technicians on configuring, troubleshooting, and performing component replacements for Digital Equipment Corporation's RZ series disk drives.