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BackConnect a 100k resistor between the 'K' side of D35, but other options exist. Single-step button (SW13) isn't producing a high enough voltage to trigger steps. Replace C10 with 100K resistor, and bridge out R44 with a more complex module, several variations on the Program, it is based on EPCOS app note at http://www.cypress.com/file/140006/download.
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