RM02/03 Disk Subsystem Service Manual

This document is the RM02/03 Disk Subsystem Service Manual, published by Digital Equipment Corporation (DEC) in June 1978. It serves as a comprehensive technical guide primarily for trained DEC Field Service and customer maintenance personnel to assist with the installation, maintenance, and repair of the RM02 and RM03 Disk Subsystems.

The manual's core maintenance philosophy emphasizes replacing defective Field Replaceable Units (FRUs). It is structured into five main chapters:

1. Introduction: Provides an overview of the manual's scope, the hardware maintenance plan, and lists essential resources such as related documentation, special tools (like the TB3A2 Field Test Unit), initial spare parts, cable lists, and diagnostic programs. It also includes a preventive maintenance schedule.
2. Installation: Details procedures for site preparation (environmental considerations, space, power requirements), unpacking and inspecting the disk drives, configuring and installing RH11 and RH70 controllers, and various cabling instructions. A significant portion is dedicated to the operation and functionality of the TB3A2 Field Test Unit (FTU) for subsystem checkout and head alignment.
3. Parts Removal and Replacement: Offers step-by-step instructions for disassembling the disk drive's external covers and internal components. This includes procedures for removing and replacing various FRUs and assemblies such as power supply modules, the blower motor, air filters, triacs, the logic chassis, the control panel, power amplifier, track servo preamplifier, drive belt, spindle assembly, and head arm assembly components.
4. Adjustment Procedures: Describes critical adjustments that field personnel may need to perform, such as velocity gain adjustments with the FTU and general voltage adjustments.
5. Fault Isolation: This core troubleshooting section guides service personnel in diagnosing problems to the FRU level using a series of "Fault Isolation Guides (FIGs)" and "Fault Isolation Procedures (FIPs)." It covers general safety information, physical location codes, power distribution troubleshooting, and various error tests.

The document stresses that certain complex procedures, such as head cleaning, carriage, and rail alignment, should only be attempted by specially trained personnel.