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Michael A. Terrell wrote:
Most of the chips in cell phones are off the shelf parts, and there are places that do repair cell phones. RMS Communications in Ocala, Florida rebuilds thousands of pagers and cell phones every week. I know several techs who worked there, and they were telling me about the equipment they had available at each work station. Most of the parts in a tek scope are off the shelf too, but like the cell phone, there are one or two show stoppers. For the cell phone, it is the microprocessor with its combination mask and flash programming. I know a guy that repairs pagers, but you cannot convince me that it is a profitable business.... The way he moaned about the cost of my fixing his RF signal generator gives me a clue. One problem with new RF and test equipment is the firmware programmed into chips isn't readily available to program replacement parts. Another problem is the short production life for some parts. If you build a product for over two years, you either do "Lifetime purchases", or redesign boards to use the next round of parts. What is real fun is a base product with up to 100 different sets of software, depending on the customers specifications. Its hard enough to keep it straight on the factory floor, let alone trying to do it in the field. It is even worse in the space field, where by the time a part is qualified, and a satellite is made, the part is stone cold obsolete. -Chuck |
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