As member @RoadrunnerOZ said before, measure the capsule isolated from the circuit.My hope therefore: The capsule should be fine - but something must be defective in the electronics (probably some of the Tantalum capacitors).
The microphone does not output sound.
You may well be right there - best way is to meter the reed and see what it is at “idle”I'm not one hundred percent sure, but it's the other way around. You can unscrew the switch completely, then the mic is always on AFAIK.
To measure the capsule open I would rather not disconnect the wires directly at the capsule, but the wires on the circuit-board. But again - no access possible without removing the plastic shroud.
Can you post some better photos of the plastic where it fits to the inner casing - that should give a clue as to how it comes apartTo measure the capsule open I would rather not disconnect the wires directly at the capsule, but the wires on the circuit-board. But again - no access possible without removing the plastic shroud.
From what I can make out it looks like it needs to rotate to clear rather than trying to lift the tabs - they may break - is there a recessed screw - it looks like it in No. 2 photo - in a lot of mics the screw goes in to free the outer casing. Sometimes you need to push in, rotate and then pull - you should be able to see through the acrylic if there’s a keyway for the teeth to follow to remove the casing. I use a head mounted magnifier with a Cree LED light to work on mics and fine SMD components.One earlier reply had to be checked by a moderator: Sennheiser MD431 electronics repair?
In that post I wrote: Having a closer look you can see on the photo that the plastic shroud is clipped on with some kind of "teeth". I tried to loosen those, but they are quite rigid.
I will post some better photos later.
Just hook a scope across the capsule terminals without disconnecting and see if audio is delivered with the mic sitting on a table and slap the table with a ruler or output a sine wave from a tuner app on your phone next to the mic - if you get a good signal the capsule is ok.To measure the capsule open I would rather not disconnect the wires directly at the capsule, but the wires on the circuit-board. But again - no access possible without removing the plastic shroud.
If the capsule is open circuit then you will hear contact noise via the circuit. Can you get clip leads onto the capsule terminals and run those to an XLR male plug and plug that into your audio system - that will bypass the internal circuitry and give output straight from the coil - if no output then it would appear to be an open circuit capsule coil.I can't hear anything from the capsule, but though my headphones I could hear myself ticking on different parts of the mic (from the suspension to the output-socket). So I still think, the capsule might not be dead.
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