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C1 is too small; need more than the total height of that diode (also U2-12) to ground to fix - 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 diameter between 16-19 mm: https://www.keyelco.com/product.cfm/product_id/826 Keystone #500, CR1220 battery holder, Keystone P/N 2468, http://www.keyelco.com/product-pdf.cfm?p=1033 AAA battery holder coin cell vertical battery CR-2025 coin cell vertical Panasonic CR-1632-V1AN battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D464.PDF battery CR-1632 coin cell vertical Panasonic CR-1632-V1AN battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D464.PDF battery CR-1632 coin cell holder CR2032 retainer clip, SMT ( http://www.farnell.com/datasheets/1505853.pdf BC-2001 CR2032 2032 Battery Holder BA9VPC 9V 2xAA cell battery holder, Memory Protection Devices P/N BC12AAPC, http://www.memoryprotectiondevices.com/datasheets/BC12AAPC-datasheet.pdf BC2003 CR2032 2032 Battery Holder SMD Tactile Switch, https://www.e-switch.com/system/asset/product_line/data_sheet/165/TL3342.pdf SWITCH SMD KSA SW 4-bit rotary coded switch, gull wing, Gray code, https://www.nidec-copal-electronics.com/e/catalog/switch/sh-7000.pdf SMD SMT HCMOS Miniature Crystal Clock Oscillator Abracon ASE series, http://www.abracon.com/Oscillators/ASEseries.pdf, hand-soldering, 3.2x2.5mm^2 package SMD Crystal MicroCrystal CC4V-T1A series http://cdn-reichelt.de/documents/datenblatt/B400/CC4V-T1A.pdf, 5.0x1.9mm^2 package SMD Crystal Qantek QC5CB, https://www.qantek.com/tl_files/products/crystals/QC5CB.pdf crystal Epson Toyocom FA-238 series http://www.mouser.com/ds/2/137/1721499-465440.pdf, hand-soldering, 3.2x2.5mm^2 package SMD Crystal SERIES SMD7050/4 https://www.foxonline.com/pdfs/FQ7050.pdf, hand-soldering, 7.0x5.0mm^2 package Miniature Crystal Clock Oscillator TXCO Fordahl DFA S15-OV/UOV.

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