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Old 9th Sep 2013, 9:37 am   #14
Dekatron
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Join Date: May 2009
Location: Linkoping, Sweden
Posts: 953
Default Re: AVO VCM163 - Some faults I have had

I just remembered one more failure of the electrode selector switch. On some models the centre pieces of this switch are made from white plastic which only has two plastic pins connecting each side. On this type of switch the white plastic bends over time which means that the rotating metal contacts travel on top of the finger contacts on the switch wafer making poor or no contact, in some cases the rotating piece has bent and destroyed the contact finger on the switch wafer as it snags. In the pictures below you can see that the rotating contacts are riding on top of the finger contacts on the switch wafer and also that the rotating contact snags on the edge, there is also one picture showing one of the unsoldered wires.

/Martin
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