Question about Sennheiser Flashmic Digital Recording Mic Microphone

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How do you take apart a sennheiser 421? - Sennheiser Flashmic Digital Recording Mic Microphone

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Hi,

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 will seperate from the housing.
Thats what I remember after 25 years.

Good luck,
Gerard

Posted on Feb 02, 2010

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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.

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5 of my 8 md 421's have developed a fluttering sound on impact of any tom! Yet they sound normal on a human voice? This sound is not like any distortion I'm used to hearing. These mics were purchased in...


Sounds like the membrane hooks on to something at high SPL's. And perhaps especially at low/low-mid frequencies. You most probably need them taken apart and have them examined.
That 5 of 8 has gone bad makes me believe it related to something that weaken with time. Say, foam going dry, tape losing its grip, rubber going stiff.
Could be an easy mechanical fix, but yes, one would have to take them apart and examine them closely.
I would ask for a service quote directly from sennheiser. They are lovely mics, and may well be worth the effort.

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Is there a pad on the md 421-u


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

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How do I take my Sennheiser MK300 mike apart?


download the manuals on the website of your MKE-300

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How does one take a Sennheiser MD 421 apart?


Hi,

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.
http://www.fixya.com/support/t3134138-apart_sennheiser_421


Regards,
Gerard

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.


Hi,

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,
Gerard

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Need to fix loose wire inside 421 sennheiser how do you open it up?


Well, it looks like an SKM 100/g2 casing so if that is true, then unscrew the bottom part till you have access to the batteries and there are three star screws you'll need to take out right between the battery compartment and the bottom with the LCD screen. The bottom cover slides down and off. If you need the cartridge out then you unscrew the top of the mic where the actual pickup is and pull the core out through the top. That should be close, but might vary a little bit.

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Turning the transmitter on and off (Fig. 5)
Turn on the sound source. This automatically activates the
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Frequency clash


There are different frequencies available and being used in each location.

To get a basic idea of which frequencies are available in your area, try this online tool:
http://www.sennheiserusa.com/findfrequency/
or use the literature provided with the Sennheiser gear (usually a useful chart comes with the wireless gear).

Also, remember that your transmitting frequencies need to be spaced apart a minimum of .400 MHz (or 400 kHz).

Frequency selection shouldn't cause feedback problems though. If you select a frequency for a mic that a local TV station is already using to broadcast, it will cause RF Interference (Radio Frequency). You'll probably hear static noises, pops, or since your Sennheiser has a Squelch feature, just drop-outs in audio.

So first consult the available charts to find a set of frequencies that should be available in your area. Then, if one of your mics is experiencing such an issue, try moving it .400 MHz to the nearest unused frequency and see if the RFI goes away. Repeat until the RFI no longer manifests.

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