VR14 and VR20 Troubleshooting Procedures

This document, published in June 1972, serves as a troubleshooting guide for the VR14 and VR20 displays. It focuses on resolving recurring component failures rather than simple parts replacement. It details three primary procedures for addressing:

• Procedure A: Fuse and power transistor (2N4399/2N5302) failures due to overheating. This includes instructions on power supply maintenance, Engineering Change Orders (ECOs) for regulator boards, and a field rework process for the deflection heat sink.
• Procedure B: Failures caused by CRT arcing, which results in overvoltage damage to intensity boards and regulators.
• Procedure C: Failures resulting from power supply overloads, faulty connections, or power latch-up conditions.

The manual also provides technical details for reconfiguring equipment to improve heat dissipation and ensuring compatibility with various power environments.