VT50/VT52 Pocket

This document serves as a "memory jogger" Pocket Service Guide for Digital Equipment Corporation's VT50 and VT52 terminals, designed for field service engineers and technicians. It supplements more detailed operation and maintenance manuals.

The guide covers a range of service procedures, including:

• Troubleshooting: Provides systematic procedures, indexed by symptoms (e.g., no cursor, abnormal display, character issues, copier/printer faults), with probable causes and corrective actions such as adjustments or replacing major subassemblies.
• Removal and Replacement: Offers detailed instructions for disassembling and replacing various terminal components and modules, including the EIA or 20 mA adapter card, power supply/monitor assembly, base assembly, character generator, printer interface option, RUT and DP modules, anti-static ground shield, keyboard, CRT assembly, CRT yoke, electrolytic copier option, and transformer assembly. This section includes critical warnings regarding high voltage and careful handling of Cathode Ray Tubes (CRTs).
• Alignment and Adjustments: Describes procedures for CRT yoke alignment and display adjustments for height, width, vertical linearity, and focus.
• Acceptance Test Procedures: Outlines off-line and on-line tests to verify terminal functionality, including specific tests for optional copier and printer interfaces.
• Installation and Operation: Provides basic steps for installing the terminal and its options, as well as instructions for off-line operation and setting baud rate switches.
• PMK04 Operation: Details how to set up and use the PMK04 tester with the VT50/VT52 terminals.
• Appendices: Includes important information on the care and handling of CRTs (safety precautions, discharge procedures, and disposal), a list of replaceable modules and assemblies with part numbers, and a physical/functional block diagram.