Question about Sony ECM-44B Lavaliere Microphone Microphone

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I have a bunch of ECM 44b microphones, I'd like to repair them.

I've opened a couple up. There's a little transformer inside. The mics I have with no visible wire damage, and which have either intermittent or permanent outage, I suspect have transformer failure. But this is just an educated guess.

How does one test that transformer? All I have to test them is a little multimeter, but I don't know how to use it. I assume its a matter of "Set the meter to ____, touch the positive tip to ___ and the negative tip to ____, and if the meter reads _____, then it's bad." Is it safe to just assume that the transformer is the problem? There's a little diode at the other end of the barrel. How would I test that, before I go replacing the transformer?

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It has been my experience that the wires going into the amplifier assembly is broken. What I do is cut the wire about 2 inched from the strain relief, remove the old wires from the amplifier and reterminate the amplifier. This fixes 90% of my problems. The other 10% is a broken wire at the microphone end of the cable. This cannot be fixed as the cabling has been injection molded.

Posted on Dec 08, 2009

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