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cdv-700 victoreen 6b rebuild Part 1 (Tin whisker discovery)

by on Mar.08, 2015, under Electronics

This all started a few weeks ago when my radon fan stopped working due to a ice jam.

It was at this time I found out all 4 of my geiger counters were non functional.

First to get fixed my trusty CDV-700

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After a few tests I discovered the high voltage supply to the probe was way off.

Tons of parts out of spec.

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Time for a rebuild kit!

part way though the upgrade.

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After cleaning and checking everything over multiple times I went to test… voltages are off.. by a bit…

On closer inspection….

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That transformer looks fuzzy….??

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That isn’t fuzz!?!

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Tin Whiskers!

 

 

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Tons of them!

 

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Even on the High voltage potentiometer 1/2 way across

 

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So tiny it is hard to get a good focus on them.

 

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No this is not a hair! That is a tin whisker going from the ground almost to the center of the high voltage adjustment potentiometer.

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