RA60 Disk Drive Service Manual

This document is the RA60 Disk Drive Service Manual, first published in May 1983 by Digital Equipment Corporation's Educational Services. It provides comprehensive information and procedures for the corrective maintenance and installation of the RA60 Disk Drive.

The RA60 is described as a 205 megabyte, random access, embedded servo, moving-head disk drive designed for removable disk packs. Its maintenance philosophy centers on "Intelligent Module Replacement," supported by features like quick access to Field Replaceable Units (FRUs), operator control panel fault reporting, hand-held diagnostic terminal capabilities, and drive-resident diagnostics (with no head alignment or adjustments required).

The manual is structured into six chapters:

1. Introduction: General information about the RA60, its maintenance features, philosophy, and related documentation.
2. Removal and Replacement Procedures: Detailed steps for disassembling and replacing each RA60 FRU, including power precautions and a list of FRU part numbers.
3. Drive-Resident Diagnostics: Instructions on how to use the diagnostic terminal and descriptions of various utility routines and diagnostic tests.
4. Theory of Operation: Explains the functional description of the RA60 Disk Drive, covering its general design, embedded servo system, read/write operations, and power supply functions.
5. Fault Isolation: Procedures for troubleshooting the disk drive, utilizing front panel fault codes, error code tables, power supply LED indicators, and a fault isolation flowchart.
6. Installation: Guidelines and procedures for installing and checking out the RA60 Disk Subsystem, including site preparation, cabinet joining, cabling, and initial power-up checks.