Power Supply 739d

This document is a technical schematic for the Digital Equipment Corporation Power Supply 739D. It details the electrical circuitry, including a transformer, fan connection, voltage regulation components (transistors, diodes, and capacitors), and power distribution for various output ranges (40-60V at 5A and 40-75V at 2A). It also includes control logic for an inhibit power supply, a read/write power supply, a low-voltage detector, and thermal protection using positive temperature coefficient thermistors. The document provides specific component specifications, test points, and a transistor and diode conversion chart.