Sony Corporation. TRI EA-3/ Sony VO-2850A Interface Instruction Manual. Table of Contents: Chassis Uncasing Procedure, Supply Drive Assembly Installation Procedure, Supply Drive Assembly Adjustment Procedure, Interface Relay Assembly Wiring, Tension Arm Defeat Assembly Installation, Tape Guide Modification, Tension Arm Defeat Assembly Adjustment Procedure. Diagrams: Play VTR Cable Connector Wiring Diagram, EA3/ VO2850A Relay Interface- Wiring Diagram, and Record VTR Cable Connector Wiring Diagram.