BA11-K Mounting Box Manual

This document is the official manual for the Digital BA11-K mounting box, an expander chassis designed for PDP-11 computer systems.

The manual provides comprehensive information covering:

• Characteristics & Specifications: Detailed physical dimensions, environmental conditions, and electrical specifications for both BA11-KE (115V) and BA11-KF (230V) versions, including input/output power and power transition behaviors.
• System Configuration & Installation: Guidelines for integrating system units, options, and cable harnesses, including Unibus pin assignments, cable routing, and specifications for cabinet and slide mounting.
• H765 Power System (Theory of Operation): An in-depth description of the power system's mechanical components (regulators, transformer, AC input box, fans, power distribution board) and their functional and detailed circuit operations.
• Maintenance: Procedures for preventive maintenance, fault isolation, voltage regulator checks, troubleshooting, and step-by-step instructions for the removal and installation of various H765 power system subassemblies.
• Unpacking & Initial Setup: Practical instructions for safely unpacking the BA11-K, connecting it to an AC power supply, and certifying its installation.

This manual is intended for users, installers, and service personnel involved with the BA11-K, and also serves as a guide for maintaining and troubleshooting the power systems found in PDP-11/05-S and PDP-11/35-S chassis.