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Diode Meter Check
if you check the forward resistance of a diode with an ohmmeter, it will change depending on the range setting?
of the meter. explain
That is because diodes are non-ohmic. Their ratio of voltage across the device to current through the device (how we define resistance for a typical resistive device) depends on exactly what voltage is across the device.
What the ohm-meter does, is produce a sample voltage across the diode, measure the current through it, and then translate for you. The sample voltage depends on the range of expected resistance measurement, which the ohm-meter operator sets.
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Easy Fix and Repair Electronic devices and Components %
Testing a Zener Diode in a Solid State Pinball Machine?
I was testing a voltage in a Bally pinball machine at on the voltage/solenoid board and accidentally touched a zener diode and it sparked off. I took out my multi-meter (mm) and set it to the diode tester. I wanted to see if I fried the zener diode. With the power to the machine "off" I placed the mm probe on both sides of the zener diode. One way it read .0000 the other way it read 1.549. Is this a legit way of testing the diode to see whether I fried it or not. If so, based on what I got am I "ok" or did I fry it? Anyone knowing the Bally Solenoid board I was checking TP4 and accidentally touched VR1 zener diode. BTW, what does the VR1 control? Any help appreciated. Thanks!
BTW, The Solenoid/Driver board is a Bally AS-2518-16.
I think the zener diode is ok as it only passes excess voltage usually to ground so components will not fry.It could be when you made the arc a transister or some other component may have fried and am not sure though that ,that happened.
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