maintenance-manual · English
TR-20 Computer Maintenance Series
Comprehensive maintenance manual for the EAI TR-20 analog computer, published August 1967 (Publ. No. 00 800.2006-0). The manual provides chapter-by-chapter circuit descriptions, technical data, patching procedures, test procedures, and troubleshooting guidance for every major TR-20 computing element including the dual DC amplifier (Model 6.712), dual integrator network (Model 12.1116), quarter-square multiplier (Model 7.045), diode function generators (X², log X, variable), coefficient attenuator groups, signal comparators, repetitive-operation and manual-mode control circuits, and regulated power and reference voltage supplies. Four appendices cover elementary analog-device principles, transistor and etched-board servicing techniques, replaceable parts lists, and engineering drawings.