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#1
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Sennheiser mkh405 problem
I fired up my pair today and found 1 is working while the other is has
a very distorted output. I know these mics tend to drift out of spec but might it be something else and is there a way for a non-tech to troubleshoot it? Right now I'm leaving it powered up to see if it might correct itself but I'm not holding my breath. -- This email has been checked for viruses by AVG. https://www.avg.com |
#2
Posted to rec.audio.pro
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Sennheiser mkh405 problem
Rick Ruskin wrote:
I fired up my pair today and found 1 is working while the other is has a very distorted output. I know these mics tend to drift out of spec but might it be something else and is there a way for a non-tech to troubleshoot it? Right now I'm leaving it powered up to see if it might correct itself but I'm not holding my breath. 1. Check the diaphragm. Is it damaged? Shine a flashlight and make sure the surface is flat. The capsules on these don't go bad easily but if they do I don't think anyone can reskin them. 2. There are three or four small electrolytics in there. Do they test good or are they leaky? Use an ESR tester on them. My personal inclination about electrolytics of that age is to replace them rather than testing them, but it's very tight in there and you will need a precision solder removal tool. Changing them is not for the faint of heart. Beyond that point you're going to be checking the RF stuff. I have seen the silver mica caps go bad and the oscillator frequency drift way off once, but I can't imagine it's that common a failure. There really isn't that much to go wrong in these; they are not that complicated, but they are RF systems so they require having your head in a different place than conventional audio gear. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#4
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Sennheiser mkh405 problem
Scott Dorsey wrote:
=================== Beyond that point you're going to be checking the RF stuff. I have seen the silver mica caps go bad and the oscillator frequency drift way off once, ** While silver mica caps certainly can go short, the MKH405 uses an 8MHz crystal. http://www225.pair.com/audio/waltzin...er/MKH-405.htm Anything might go wrong with a 50 year old RF mic. ...... Phil |
#5
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Sennheiser mkh405 problem
Rick Ruskin wrote:
Thanks. I'll contact Sennhieser tomorrow to see if they still service this unit. The caps have been obsolete for decades now but I suspect something else has bit the dust. I'd ask them to recap both of them when they fix one, so that you'll have a pair that are reasonably matched. They are both overdue for that sort of maintenance. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#6
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Sennheiser mkh405 problem
On 9 Oct 2020 16:29:04 -0000, (Scott Dorsey) wrote:
Rick Ruskin wrote: Thanks. I'll contact Sennhieser tomorrow to see if they still service this unit. The caps have been obsolete for decades now but I suspect something else has bit the dust. I'd ask them to recap both of them when they fix one, so that you'll have a pair that are reasonably matched. They are both overdue for that sort of maintenance. --scott Sennheiser informed me that they no longer support these mics. Would you like to take qa look at them? Rick Ruskin Lion Dog Music - Seattle, WA http://liondogmusic.com -- This email has been checked for viruses by AVG. https://www.avg.com |
#7
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Sennheiser mkh405 problem
Rick Ruskin wrote:
On 9 Oct 2020 16:29:04 -0000, (Scott Dorsey) wrote: Rick Ruskin wrote: Thanks. I'll contact Sennhieser tomorrow to see if they still service this unit. The caps have been obsolete for decades now but I suspect something else has bit the dust. I'd ask them to recap both of them when they fix one, so that you'll have a pair that are reasonably matched. They are both overdue for that sort of maintenance. Sennheiser informed me that they no longer support these mics. Would you like to take qa look at them? Not really. Surely someone works on them, they aren't that bad. Let me ask a former Sennheiser guy. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#8
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Sennheiser mkh405 problem
Try Location Sound Corp. They do 805s all day long, they should have no problem with a 405. If they don't want to touch it, I'll look at it, but they are good people. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#9
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Sennheiser mkh405 problem
On 16 Oct 2020 12:39:53 -0000, (Scott Dorsey) wrote:
Try Location Sound Corp. They do 805s all day long, they should have no problem with a 405. If they don't want to touch it, I'll look at it, but they are good people. --scott Thanks!. I have it with someone local now. If he decides against taking it to the finish line, I'll contact them. RR Rick Ruskin Lion Dog Music - Seattle, WA http://liondogmusic.com -- This email has been checked for viruses by AVG. https://www.avg.com |
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