Basic Purpose Printer LB20 Field Support Manual

This Field Support Manual for the Digital LB20 Basic Purpose Printer is intended for Service Engineers, offering comprehensive guidance on the printer's installation, operation, and maintenance.

The document begins with an Introduction that details the printer's specifications, including physical dimensions, electrical requirements, interface types (Serial RS232C, Parallel Centronics), and performance metrics. It also outlines the types of documents the printer handles (forms and passbooks), specifying their dimensions, thickness, and rules for usage. An overview of test routines and default configurations for various printer settings is also provided.

The Fault Diagnosis section provides a structured approach to identifying and resolving printer issues. It describes the Confidence Test Routine (CTR) for power-on diagnostics and the Maintenance Test Routine (MTR) for in-depth testing and adjustments, such as calibrating the edge detector, checking printhead function, and setting margins. Detailed troubleshooting flows are included for various error conditions, including power failures, inactive components, communication problems, and printing faults.

The Removal and Replacement chapter contains step-by-step procedures for both preventive and corrective maintenance. It covers the replacement or cleaning of all major Field Replaceable Units (FRUs) and other components, including ink ribbon cassettes, mylar cassettes, printheads, logic boards, power interface boards, motors, and sensors. Each procedure is accompanied by diagrams and concludes with specific recommissioning steps required after a component has been replaced or adjusted.

The manual also includes a Glossary of technical terms and emphasizes safety warnings throughout.