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Mitch, thanks for your reply. When I originally posted, I guess I was having a 'grumpy old train guy' moment and let my temper get the best of me. I ended up spending the $ and got a New-Old-Stock MRC Tech4 260 from a verified 'train guy' and it's been terrific; it's increased the enjoyment factor significantly with my DC-only locomotives.
Well, just consulted a tech buddy of mine, and he recommends replacing the blue caps. He's going to see if he can track me down a couple of donor caps... :)

Mitch
 

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Hi all this is the first post for me here:
I am trying to repair a couple of Tech 4 MRC260's for my model railroad clubs new DC layout. Both have a direction control issue. I have traced the problem to the Q7 transistor on both boards. It is labelled .D1230 and is attached to a large heat sink. I think its a Darlington transistor but can not find and data sheets to order a new one. Any help identifying this component would be appreciated.

Thanks
 
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