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How do I test a 'DIODE' with a multimeter?
I've damaged the sequencer on my analogue synthesizer (roland mc-202), and I need to firure out how to repair it.
It may be one of the diodes which has broken, so I need to test them all.............
I have little experience with electronics, but I do have a multimeter, so if anyone could advise me how to use it to test the diodes then I would be greatful.
thanks
It is best to unsolder one end of the diode before testing, but if you are going to test a lot of them you might be able to find a bad one without unsoldering them.
Set the ohmmeter on RX10. Connect the leads across the diode, note the reading, reverse the leads and note the reading. One reading needs to be approximately ten times greater than the other. For example, if one way it reads 40 ohms, the other direction should be 400 ohms or more. The amount of ohms is not important, it's the ratio that you are looking for. If ten to one ratio or better checks out you can be pretty sure that diode is okay.
If you have a shorted diode the meter will read zero both ways. If you have an open diode you cannot prove this without unsoldering one end.
Remember, heat destroys diodes, you apply the heat and pull the diode out QUICKLY, before the heat ruins it. You can clip an alligator clip on the diode lead to absorb some of the heat.
My guess is that you will not have a bad diode, you will have a bad IC or transistor.
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VC97 3 3 4 Auto Range Digital Multimeter All Function US $34.99
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VC97 3 3 4 Auto range digital multimeter all func prot US $33.04
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VC97 3 3 4 Auto Range Digital Multimeter All Function US $31.88
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