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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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Zener Diode higher voltage at other disconnected end?
Im confused. I was operating on a KOSS DVD player and found a
defective +5V supply. Just before the +5v output pin, there was a diode (unknown exact type) I measured the voltage at the supply side of the Diode and it read +5V and on the "output" pin side that was NOT connected to anything I read +22V. How the heck is that? At any rate, I removed the diode from the circuit, and now I have the +5V back. All is not perfect however, the DVD player shuts off every hour or so now. My questions are 1) what do you think that diode was for. 2) why is it possible that I got a higher (much) voltage on the other side of the diode when it was not connected to anything. thanks! |
#2
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Zener Diode higher voltage at other disconnected end?
wrote in message oups.com... Im confused. I was operating on a KOSS DVD player and found a defective +5V supply. Just before the +5v output pin, there was a diode (unknown exact type) I measured the voltage at the supply side of the Diode and it read +5V and on the "output" pin side that was NOT connected to anything I read +22V. How the heck is that? At any rate, I removed the diode from the circuit, and now I have the +5V back. All is not perfect however, the DVD player shuts off every hour or so now. My questions are 1) what do you think that diode was for. 2) why is it possible that I got a higher (much) voltage on the other side of the diode when it was not connected to anything. A shunt regulator circuit is a series resistor and shunt zener. A higher voltage is normal on the input to a shunt regulator (before the resistor). Removing the zener would normally result in a higher output voltage. I too am confused. |
#4
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Zener Diode higher voltage at other disconnected end?
" wrote: on the "output" pin side that was NOT connected to anything I read +22V. How the heck is that? It seems it was conected to something but you must have missed it. Explain how a diode has an 'input side' and an 'output side' too will you ? Graham |
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