Question about Sennheiser MD421-II Professional Microphone

1 Answer

Md421-II My cousin dropped this mike into a pool about a year ago.  I plugged it up and it worked!  Problem:  every now and then it cut's out.  Question: how do I take it apart to perhaps find the problem and repair it myself?

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 682 Answers
Re: md421-II

First use hair dryer for a minute if you have.
second- bring any box with suitble size to mic and put a rice on it and put the mic on it for a couple of days{rice absorb wet and humidity}

Posted on Feb 26, 2008

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

Need to take it apart to replace the grill


First you must loosin the connector.
There's a little shield with the serialnumber you can slide away.
Underneath that you will find the screw to loosin the connector/filter.
If you look inside you will find a bolt, unscrew that one and the element and grill will seperated from the housing.
Thats what I remember after 25 years.

Good luck,

Apr 23, 2011 | Sennheiser MD421-II Professional...

1 Answer

My MD 421 suddenly has no high end. Sounds muffled and distorts when I yell into it.

Check the cable. It maybe damaged. Check your phantom power. If your going to yell into the mic...Turn the input gain down to avoid initial distortion. Not sure of your recording setup, but everything in the chain input to output is key.
You can probably assume the mic to be damaged if these things dont check out.
I have a MD 421.

Mar 31, 2011 | Sennheiser MD421-II Professional...

1 Answer

Is there a pad on the md 421-u

No, just the high-pass filter sleeve.
Sorry, Cody J.

Dec 15, 2010 | Sennheiser MD421-II Professional...

1 Answer

How does one take a Sennheiser MD 421 apart?


At the connctorside there's a small metal plate with a serial number.
You have to bench it a little, underneath there's a screw.
Unscrew it and you can take the connector out.
What I remember after 25 years is that there is a screw inside which is loosing the grill and element.

I've written it before with succes.


May 17, 2010 | Sennheiser MD421-II Professional...

1 Answer

I have to shake it to get a signal. Seems like a bad connection. Used very little in a home recording studio.


It could be a dirty switch, you can find this switch at the back of the 421. You can rotate it several times to clean the contacts a little bit. Otherwise you have to take the 421 apart.

Good luck,

Dec 31, 2009 | Sennheiser MD421-II Professional...

1 Answer

How to open a vintage sennheiser 421hl

Try contacting them here: Have a look at the bottom end of the microphone where the cable connects. What are the four holes for? I don't have one to look at but I do remember working on one about 20 years ago. Also I seem to remember that the side rails slid back. I hope this helps.

Nov 27, 2009 | Sennheiser MD421-II Professional...

1 Answer

I dropped my mike (not a a big fall) and now it doesn't work.Help

Mikes are very fragile things and if you consider that the wire on the diaphragm is hair thin then you will understand that when dropped it will break easily. Also the magnetic field of the magnet is distorted by the impact. If you can get the wiring connector apart where the mike cable plugs in try testing for continuity on the 2 wires coming from the cartridge. Use a high resistance reading and work downwards. If you get nothing you will have to decide whether you want to replace the cartridge or buy a new mike. Sorry for your bad luck. I have 2 AKG mikes circa 1966 that it happened to that I still keep as a reminder.

May 20, 2009 | Samson R21 Professional Microphone

2 Answers

Dead md421

Ignore GazllFixIt...

If it's dead, a connection is already broken inside.

Much more unlikely is that the capsule is at fault - and if it is you can't make things any worse anyway.

Who cares if you break a connection when you take it apart - as long as you can use a soldering iron, it's easy enough to fix. If you can't, why would you be taking apart in the first place ;)

You'd be mad to send it to Sennheiser to solder 1 or 2 points then send it back to you! Waste of time and money.

Try learning something yourself, especially if it only cost $10 and doesn't work to begin with.

Remove the capsule assembly - desolder and disconnect the wires at the base of the mic (not from the capsule) yourself (see, opposite of last advice), then connect them directly to a cable with an XLR on the other end. Forget about ground for now.

Now plug it you hear anything? If not, get a multimeter and check continuity between capsule and your XLR. If you have continuity, throw the mic out. If not, replace those wires. Still nothing - chuck it out.

If you are hearing something (it should sound absolutely fine, clear, loud etc), ...find the broken connection elsewhere...but also, be happy because it definately still works and is definately fixable and you can do it yourself.

Jan 05, 2008 | Sennheiser MD421-II Professional...

1 Answer

Does not work

i had the same problem it's because your plugging it into the front of your computer....plug it in the back and it should work....there should be something that pops up or click in the right hand corner there's an icon that says sound need to acknoledge that it's a mic not a cam that your plugging in

Nov 06, 2007 | Labtec Microphone Microphone

Not finding what you are looking for?
Sennheiser MD421-II Professional Microphone Logo

Related Topics:

231 people viewed this question

Ask a Question

Usually answered in minutes!

Top Sennheiser Microphones Experts


Level 2 Expert

611 Answers

Mando Mojica
Mando Mojica

Level 3 Expert

643 Answers

Are you a Sennheiser Microphone Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides