G9340

This document is a schematic diagram, copyrighted 1971 by Digital Equipment Corporation, for a device titled "BRAKE ACTUATOR" (Number 69340-0-1). Its stated purpose is for test and maintenance of its proprietary circuits.

The schematic details a control circuit, likely for a motor-driven system (e.g., a tape drive), that processes various input signals to activate brakes. Inputs include motor voltage and switch status (Lower/Upper Motor Under/Low Voltage Sense, Motor Switch Open/Up/Reverse Switch), reel motor enable, force brake commands, and relay enable.

The circuit utilizes integrated logic circuits (e.g., DEC 7400 series gates E1-E5), discrete transistors (Q1-Q5), resistors, capacitors, and diodes. It generates output signals such as "LOWER BRK ON H," "UPPER BRK ON H," "LOW REWIND BRK L," and "FLD LOAD PULSE L," indicating the activation of specific braking mechanisms or related control actions. The document also includes a components list detailing the parts used.