KL8-J/K Loop Back Test

This document describes the KL8-J/K Loop Back Test, a diagnostic tool designed to verify the functionality of terminal control/data interface boards (specifically M8655). The test utilizes loop-back methods, either by connecting the EIA interface to itself or via a 20mA current loop connection. The manual covers requirements, loading procedures, standard test methods, and operator instructions for initiating and interpreting test results, including error handling.