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Problem 740 Masterlab


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I have a problem with Gretag 740 masterlab. Changed the paper drive motor and after that one of the boards in wetpart control section burnt. It was the 803 board. Four transistors( I think) burnt completely. Put a new  

board in and after a minute those four transistors was so hot I could not touch them, then turned machine off quickly. Not sure what is causing it, any help would be appreciated.

Than you

LJ (South Africa) :o

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  • 1 month later...

there might be wires on your new motor that go from positive and neg leads to ground on the motor frame. On older masterlab non + models the wires on new motors would fry the 803 causing the sorter to not work. Cut the wires and tape the ends so they wont arc on anything and you should be done blowing 803's. Good luck 8)

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