I can't confirm 100% but seeing the schematics, those 6 diodes are located in circuit with other semiconductors so you could expect readings in both directions.
(Topic ID: 226967)
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With machine 'ON' and motor-board connected, you can 'ground' J1-1 (blu-red) and it should rotate in one direction.
When both J1-1 and J1-2 (blu-brn) are 'grounded, it should rotate in other direction.
If not, probably motor driver pcb broken or motor itself.
It seems likely that the bi-directional motorboard is the problem.
Quoted from Arcade:The capacitor on it looked good, but on closer inspection had leaked underneath.
You can remove the capacitor (C2) and have a look at the traces underneath.
Quoted from Marten:ask if I can try the board in Robin's Doctor Who.
Yes, that should be an easy test. (btw, I'm not going to make it to HQ tonight, maybe next time)
You can check the outputs of the lm339 on U1 pin1 and 2, one should be high ( 12Volt ) and the other Low ( 0 Volt ).
And when J1-2 (inv) is put to GND, the state of U1 pin 1 and 2 are inverted (H -> L) and (L -> H)
see you next time !
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