Universal Dip Inserter 6796

The situation: When I press the "ZERO" button of the dip inserter, the x-y table moves very slowly toward the -x -y corner. If I release the button, the x-y table stops. The 36 vdc is dead. I replaced the "1REC" (it was fried) and the problem is still there. The new rectifier fried also.

Could it be one of the driver cards? If so, how can I test those driver cards with just a multi-meter?

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