CM200 Mystery

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RadioRookie
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CM200 Mystery

Post by RadioRookie » Sat Nov 11, 2017 4:09 pm

IMAG0745.jpg
I found this rattling around inside of a CM200 that I took out of service a few months back. There was never anything noticeably wrong with the radio. I've taken the radio completely apart and for the life of me I cannot find where this came from.
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Notarola
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Re: CM200 Mystery

Post by Notarola » Sat Nov 11, 2017 6:50 pm

If the radio was serviced before you opened it. it looks like something that just fell into it. We all know how clean most service benches are.
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TOSH
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Re: CM200 Mystery

Post by TOSH » Sun Nov 12, 2017 10:40 pm

Kinda look like a reverse polarity protection diode. May be just the top off of one.
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Re: CM200 Mystery

Post by RadioRookie » Mon Nov 13, 2017 12:40 am

IMAG0746.jpg
That's the reverse side of it. I've scanned the board and internals with a magnifying glass and cannot find anything missing. I think Notarola may be right. It could have fallen in there accidently, or it's possible the original board was replaced at some point and that was just leftover in the housing somehow.
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Re: CM200 Mystery

Post by TOSH » Mon Nov 13, 2017 3:32 pm

It is VR500 a 24 volt zener connected across the 12 volt input. Part numberMR2835S or 4813832C77.
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Notarola
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Re: CM200 Mystery

Post by Notarola » Mon Nov 13, 2017 5:36 pm

good eyes. now Radio can look and see if the part is missing or damaged.
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Re: CM200 Mystery

Post by RadioRookie » Mon Nov 13, 2017 6:53 pm

TOSH wrote:It is VR500 a 24 volt zener connected across the 12 volt input. Part numberMR2835S or 4813832C77.
Thanks, TOSH. Now I know which area to focus on.
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Re: CM200 Mystery

Post by RadioRookie » Sat Nov 18, 2017 5:23 pm

Update: Mystery solved. TOSH was correct. After focusing on the power supply area, I was able to find exactly where it went. The tabs broke off under the solder. Found a supplier and replaced it. Thanks again, TOSH.
“When you tell somebody something, it depends on what part of the country you're standing in as to just how dumb you are.”
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