LG31 Printer

This manual serves as a comprehensive guide for the installation, operation, and maintenance of the LG31 300 LPM Line Matrix Printer. The printer is designed for data processing and office environments, using fan-folded, tractor-fed paper, and features a universal power supply (100-240V, 50-60Hz) and an RS-232-C serial interface.

Key sections of the document cover:

• General Information: Provides an overview of the printer, its major components (control panels, printer mechanism, electronics, power supply), and detailed specifications including dimensions, electrical requirements, operating conditions, printing characteristics (LPM, LPI, CPI), resident fonts, and character sets.
• Installation and Checkout: Outlines the unpacking procedure, requiring two people due to the printer's weight. It details steps for removing shipping materials, installing paper handling hardware, connecting power, and performing initial power-up self-tests and configuration printouts. It also covers setting up the serial interface with various operating systems.
• Controls and Indicators: Describes the functions of the external and internal control panels, which include keys for routine operations (e.g., TEST/CLR, FORM FEED, ON LINE) and more complex parameter adjustments. It explains the three-character LED display for status and fault codes, the audio alarm, and mechanical adjustments like paper tension, print gap, and margin.
• Setting Communications and Print Parameters: Details how to configure user-settable parameters in "program mode" (e.g., font style, CPI, LPI, forms control, margins, horizontal/vertical tabs, printer control straps) and "function mode" (e.g., printer initialization, forms setup, print adjustment, buffer clear).
• Printer Diagnostics: Explains the various self-tests performed automatically at power-up and during operation, as well as operator-invoked print self-tests and alignment tests. A list of diagnostic fault codes is provided to aid troubleshooting.
• Printer Operation: Offers instructions for common user tasks, including loading paper, installing and re-inking ribbon cartridges, controlling paper motion (form feed, line feed, microstepping), aligning paper, clearing the printer buffer, and understanding "Low Paper Printing" and "Hex Dump" functions.
• Operator Maintenance: Describes routine maintenance activities such as cleaning, ribbon changes, and troubleshooting common mechanical and electrical issues, with tables detailing problems and their remedies. It also lists factory default settings and parameters retained after power-up.

The manual includes appendices listing LED display messages, detailed parameter selection menus, and country kit information.