PDP-12 Maintenance Manual Volume II

This document is Volume II of the PDP-12 Maintenance Manual, providing comprehensive guidance for field service engineers and personnel on the installation, maintenance, adjustment, and repair of the PDP-12 computer system.

It covers initial installation procedures, including site planning (space, power, safety, environmental conditions), detailed unpacking and inspection instructions for cabinets and peripherals like the Teletype, and preliminary system checkout tests (Teletype, memory, and diagnostic programs).

The manual outlines both preventive and corrective maintenance. Preventive tasks involve scheduled cleaning, inspections, power supply checks, and running diagnostic programs to ensure system reliability. Corrective maintenance details a systematic troubleshooting approach, encompassing preliminary investigation, system, logic, and circuit fault isolation, repair, validation, and documentation.

Extensive sections are dedicated to adjustments for critical components, such as memory current and strobe, power supply settings, extended memory, Teletype clock synchronization, and LINCtape transport mechanisms (timing, delays, mark clock, brake, torque, head alignment). It also covers adjustments for analog and display units, including digital-to-analog converters, VR12 display size/position/brightness, deflection amplifiers, and analog-to-digital channels.

Further sections detail the field installation and checkout of 20 prewired options, providing specific procedures for components like A-D Control, Extended Memory, Tape Control, and various scopes. Dedicated Teletype maintenance instructions are included for Models ASR 33 and 35, covering special tools, preventive tasks, and troubleshooting.

Appendices offer information on Digital Equipment Corporation's service options (contracts, per-call, depot repair), customer acceptance processes, essential forms and checklists for installation and tracking, and a comprehensive list of PDP-12 software and diagnostic programs (MAINDECs).