VXT 2000 Model VX227 Windowing Terminal

This document serves as a service guide for the VXT 2000 Model VX227 Windowing Terminal. It provides comprehensive instructions for Digital Services personnel and qualified self-maintenance customers on how to diagnose, troubleshoot, and repair the terminal.

Key areas covered include:

• Product Overview: Description of the terminal's hardware, operating features, and site requirements, including network connections, memory, and software support.
• Testing Procedures: Details on running built-in self-tests and diagnostic tests, identifying memory errors (soft and hard), and interpreting power-up LED sequences and error codes.
• Troubleshooting: Guidance on using console error codes, LED error codes, and a general troubleshooting table to pinpoint and resolve problems.
• FRU Replacement: Step-by-step procedures for removing and replacing various Field Replaceable Units (FRUs) within both the system and monitor sections, including memory modules, network modules, video amp modules, and power supply modules. It also includes warnings for handling high-voltage components like the CRT.
• Video Display Alignment: Instructions for aligning the monitor display using test patterns, a radiance meter, and various video adjustment controls (e.g., linearity, cutoff, focus, centering, rotation).
• Appendices: Additional resources such as related documentation, a recommended spares list with illustrated FRU breakdowns, and detailed self-test error descriptions.