RD54 Stopped Spinning

[Robert Jarratt]

The other day my RD54 just stopped rotating, dead in its tracks, while it
was running. I guessed one of the motor control power transistors may have
failed. I assume they are the series of 6 chunky ones attached to a single
heatsink. I have desoldered them (en-masse) and tested them with a Peak
DCA55 tester, and they all appear to be working. Does anyone have any other
suggestions? Has anyone ever repaired an RD54 control board?

 

Regards

 

Rob