RWZ21 Magneto-Optical Disk Unit Maintenance Guide

This document is the RWZ21 Magneto-Optical Disk Unit Maintenance Guide, published by Digital Equipment Corporation Japan in August 1992.

It provides technical information for maintaining the RWZ21 unit, primarily covering:

1. Error Codes: Detailed listings of "Sense Keys" (general error categories) and "Additional Sense Codes" (specific error descriptions), aiding in troubleshooting. It also includes a notice about a specific VAX ROM diagnostic test being incompatible.
2. Parts List: Tables itemizing the RWZ21 unit itself, various accessories (like cleaning kits and disk cartridges), compatible SCSI cables for different host connections (e.g., VAXstation, DECstation), and regional power cords.
3. Block Diagram: An illustration of the RWZ21's internal architecture, showing the interconnected "Controller Block" and "Drive Block" components.