RD54 Stopped Spinning

Robert Jarratt robert.jarratt at ntlworld.com
Thu Apr 2 17:18:57 CDT 2015

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?





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