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Did you replace transistors Q30 and Q34 allready ? (on powerboard)
These are the transistors that control the the little board (motorboard)
(Topic ID: 152653)
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Can you test the motorboard on a workbench ?
You only need a powersupply to do this........ and a dmm
Connect the red wire of your dmm to J2 P1
connect the black wire of your dmm to J2 P4
set the dmm to voltage (DC)
On J1 :
connect B+ to 12v DC
connect B to GND
your dmm should read 0 volts
connect D1 to GND ...............dmm should read +12 Volt (Now the motor turns one way)
disconnect D1
connect D2 to GND................dmm should read - 12 volt (Now the motor turns the other way)
now you know if the board works !
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