RV20 Optical Disk Subsystem

This document is a service guide for the Digital Equipment Corporation RV20 Optical Disk Subsystem. It provides detailed technical information for field service personnel, including:

• Introduction: A description of the subsystem, its components (including the H9643 cabinet), and field-replaceable units (FRUs).
• Subsystem Testing: Extensive procedures for testing the subsystem using VAX Diagnostic Supervisor (VDS), MicroVAX Diagnostic Monitor (MDM), and level IIR diagnostics, including diagnostic command sequences, test descriptions, and error reporting/code explanations.
• Off-Line Testing: Procedures for troubleshooting the RV20 drive using the Structured Analysis Method (SAM) and CE mode, including power-up procedures, automatic self-test modes, and detailed tables for failure/subfailure codes and corrective actions.
• Removal and Replacement: Step-by-step procedures for replacing external and internal components, including the power supply, card rack, spindle assembly, and carriage assemblies, with accompanying safety warnings.