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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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vcr/dvd combo
the unit is about a year old. It has no power, fuse is good. PR1005
appears to be open and zener 1041 is reading shorted. Has anyone run into this problem. If so are these the only components you ran into that were bad. Thanks ahead of time |
#2
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vcr/dvd combo
What is the device labled PR1005?
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#3
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vcr/dvd combo
"shepleygr" wrote in message reenews.net... the unit is about a year old. It has no power, fuse is good. PR1005 appears to be open and zener 1041 is reading shorted. Has anyone run into this problem. If so are these the only components you ran into that were bad. Thanks ahead of time If the shorted zener is in the secondary area, this is often caused by bad (high ESR) capacitors. The zener in this scenario exists in order to protect other components downstream by shorting out if that particular power line goes above the zener level as a result of a loss of regulation, which in turn is most often caused by the bad caps. Replacing the caps and the zener usually fixes the problem in these cases. If the zener goes directly between a DC line (say the 5v or 14v line) and ground, without benefit of a limiting resistor, that is a giveaway that this is your problem. In the situation I have proposed, the zener does nothing under normal circumstances, thus requires no limiting resistor. MarkZ . |
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