MP01421 RA60 Dec82

This document is the RA60 Field Maintenance Print Set, a comprehensive technical manual published by Digital Equipment Corporation (DEC) in 1982. It is designed to provide detailed information for field maintenance of the RA60 Disk Drive Assembly and its various system configurations.

The document is highly structured and includes:

• Table of Contents: An organized list of all included sections and modules, facilitating navigation.
• Assembly Views: Detailed isometric, exploded, and sectional diagrams showing the physical arrangement, component placement, and notes on dimensions, torque specifications, and cable routing for the main disk drive assembly and its sub-assemblies (e.g., Spindle, Positioner, Front Cover).
• Parts Lists: Extensive lists for each module and assembly, detailing part numbers, revisions, descriptions, and quantities required for different RA60 unit variations. These lists cover mechanical components (chassis, bezels, screws, washers) and electronic components (resistors, capacitors, diodes, integrated circuits).
• Schematic Diagrams: Detailed circuit diagrams for critical electronic modules, including the Post Amp/Data Separator, Drive Logic, Read/Write Preamp, SDI Interface, Regulator Module, and Motor Control.
• Signal Cross-References: Tables that map signal names to their corresponding locations (sheet and coordinates) within the schematics, essential for troubleshooting and signal tracing.
• Engineering Change Orders (ECOs): Specific updates detailing component deletions, additions, and wiring modifications for various revisions of modules like Drive Logic, SDI Interface, Heatsink Board, and Front Panel, ensuring the manual reflects product evolution.

The document covers multiple RA60 unit variations (e.g., RA60-00, RA60-AA, RA60-CA, RA60-DA, etc.), making it a central resource for maintaining these disk drive models.