DECwriter 110i Printer DECcolorwriter 120ic Printer

This Service Manual provides comprehensive mechanical and electronic information for servicing the DECwriter 110i (monochrome) and DECcolorwriter 120ic (color) ink-jet printers. It is intended for use when troubleshooting steps in the User Guide have not resolved an issue.

The document covers the following key areas:

• General Information: Introduces the printers' features, technical specifications (printing technique, resolution, speed, workload, fonts, paper handling, interfaces, RAM, operating environment), firmware details, and available character generators.
• Functional Description: Explains the internal components and their functions, including how monochrome and color ink-jet print heads operate (ink bubble creation, nozzle structure, heating element activation), and describes the operator panel controls.
• Installation: Details the complete installation process, from general rules for placement and power supply to unpacking, connecting to power, installing print heads and paper trays, loading paper (manual and automatic), inserting memory cards, installing optional serial interfaces, and running initial print tests. It also covers programmable parameters via selector switches.
• User Maintenance: Outlines basic maintenance tasks, safety precautions, and procedures for nozzle cleaning and priming for both monochrome and color print heads.
• Diagnostics and Tests: Describes built-in diagnostic routines (power-on diagnostics, monochrome and color print tests, data scop printing/hex dump) and provides a troubleshooting guide for common problems related to power, print quality, paper feed, and data transmission.
• States and Indicator Meanings: Defines the various operating and functional states of the printer, along with the meanings of indicator lights and flashing patterns for different warnings and fault conditions.
• Electrical Interconnections: Provides detailed information on the main board components, the power supply circuit, and the electrical connections between the main board and various drive mechanisms, including pin-out diagrams for connectors.
• Parts Replacement: Offers step-by-step procedures for the disassembly and reassembly of major printer components, such as ink cartridges, print heads, the printer casing and base, mechanical assemblies, the main board, power group, operator panel, paper feed motor, carriage motor, and head transport carriage.

The manual emphasizes a gradual approach to understanding printer functions, with important information highlighted for critical procedures.