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Author Topic: Need Replacement for Yaesu MH-39 mic  (Read 1628 times)
KK4DUZ
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Posts: 2




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« on: February 20, 2012, 06:42:59 PM »

The MH-39 mic I have been using with my FT-8500 is acting up -- changing frequencies unpredictably when it's moved, touched, or when I try to transmit. I can't find another MH-39, so I need to know if there is a currently produced mic which I can use as a replacement. Any advice?

Chuck, KK4DUZ
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KE7FD
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Posts: 169


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« Reply #1 on: February 21, 2012, 09:18:42 AM »

It may simply be that the contacts are gummed up and need to be cleaned real good. When I've had to clean the samll contacts found in such devices, using a high quality denatured alcohol (Home Depot) with cotton swabs and/or a non-residue spary contact cleaner solves such issues.  If the problem is in the cable itslef and if it's a RJ45 plug, you might be able to re-purpose a CAT 5 cable or terminate a new (what...an 8 conductor) coiled cable.  Something like what you see here: http://www.kenselectronics.com/lists/micpart.htm#Cords ,but find out how many conductors are in the cable now.  I've replaced two mic cables of late, one was a 2m rig and the other HF (refurbished a D104).  If the electronics are what's failing, then see what Yaesu charges for the inside replaeement part.

IMHO,
Glen - KE7FD
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N5WT
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Posts: 1




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« Reply #2 on: February 25, 2012, 03:00:52 PM »

I have been having the same exact problem with my mike.
I took the back off of my mike and after looking very closely I notice there appears to be some heat stress close to the volume control. I think it is a transistor marked 26 and sideways 31 and a resistor
i think. I took a picture of them showing the heat stress but I did not see a way of posting it on this blog
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