RA80 Maintenance Guide

This document, the RA80 Maintenance Guide (dated 1982), provides technical support and corrective maintenance procedures for the RA80 disk drive. It includes:

• Removal and Replacement: Instructions for locating major Field Replaceable Units (FRUs) like logic modules and base plate assemblies.
• Adjustments: Procedures for belt tension and servo adjustments, crucial after component replacement.
• Drive-Resident Diagnostics: Detailed operation of internal diagnostics, test-select codes, and LED status/prompt codes.
• Fault Isolation: Troubleshooting charts, hexadecimal conversion information, and a comprehensive FRU/Service Reference Table for identifying parts and service documentation.

It is intended for Field Service engineers and covers diagnostic control usage and power supply fault isolation.