As a fan of vintage tube equipment, it should come as no surprise that I prefer older quality computer equipment. In this article, I explain how to repair “Scanner System Failure” problems in a vintage HP Officejet R-series multifunction scanner-printer. Model R40xi is shown in the photos, but all models (R40, R40xi, R60, R60xi, R80, […]
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©2009, All rights reserved. The article will discuss a cheap and easy way to test panel meters. The meter in your tube tester is an example of a panel meter. Occasionally you see flaky meter operation and suspect that the panel meter may be defective. Most techs know that it may not be safe to
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A common (and totally random) problem with GM vehicles that have the Passlock / Passlock II anti-theft system is that the vehicle will suddenly refuse to start. The problem is a poorly designed GM Passlock anti-theft system that erroneously enters anti-theft mode and disables the fuel injectors. GM should be forced to recall this Passlock
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This article will discuss Mercury tube testers. The Mercury Electronics Corporation of Mineola NY produced a number of tube testers in the 1960s. All models are small, portable, and lightweight. Popular models include 990, 1000 / 2000, 1100, 1100A, 1100C, 1101. Models and comments will be added as I find time. Electrical voltages are
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This article will discuss repair and calibration of the NRI Professional model 70 tube tester. High voltages are present, repairs should only be attempted by a qualified technician. Copyrighted, all rights reserved. Introduction Built by Precision Apparatus Co for NRI, the high-quality craftsmanship of the NRI Professional model 70 tube tester is readily apparent. It
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