555 Dectape Dual Transport

This document is a technical manual for the Digital Equipment Corporation (DEC) 555 Dectape Dual Transport. It provides an overview of the hardware, which consists of two independent tape transports using a simple drive system without capstans, pinch rollers, or tensioning mechanisms. The manual covers specifications, the theory of operation regarding the motor drives and relay network, operating procedures, and maintenance instructions for tape stop adjustments. It also includes an engineering diagram of the chassis wiring.