Hi Erwin
Try the Vixen group on Yahoo Groups. Here is a copy and paste of post
http://groups.yahoo.com/group/Vixen-scopes/message/1467
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Actually, my controller has a reference, inside, of DD1 - MRC and it
has become practically useless because it drives my GP-DX in a
spasmodic fashion.
I suspect it has failed because it has neither over-voltage nor
reverse-polarity protection. Does anyone know of a likely fix?
Speaking to Bev at COAA, the guy who is behind the excellent WinCTC GoTo system, he reckons that the design of the plug and socket can reverse polarity and kill a transistor inside the controller box. He reckons that by replacing transistor type 220 KA7805A he cured his DD1 some time ago. However, my DD1-MRC may be a later model than his and does not incorporate the same transistor. Meanwhile he has gone over to an AWR controller which has the protection and drives much faster than the DD1.
Any one know how to diagnose what has failed and how to cure it, please?
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Cheers
Dennis
PS - You are working it too hard; go to bed and let the poor drive get some rest :-)