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Used 10.25mm, but this painted us into a solid square wave. Easiest bodge on the bottom of the bad trace. 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 7-segment display with LED backlight 128x64 RS-232 I2C or SPI TFT-graphic display 320x240 16 bit colour with led backlight TFT graphical display 480x272 16-bit colour with LED backlight 160x104 RS-232 I2C or SPI 3 Line 12 character wide alpha numeric LCD LCD-graphical display with LED and photoresistor 3 Lead Plastic Package OnSemi CASE 100AQ for QRE1113, see https://www.onsemi.com/pub/Collateral/QRE1113-D.PDF OnSemi CASE 100CY, light-direction upwards, see http://www.onsemi.com/pub/Collateral/QRE1113-D.PDF PhotoDiode, plastic SMD DIL, 4.5x4mm, area: 2.65x2.65mm, https://dammedia.osram.info/media/resource/hires/osram-dam-5467144/SFH%202430_EN.pdf PhotoDiode, plastic SMD DIL PhotoDiode, plastic SMD DIL, 4.5x4mm, area: 2.65x2.65mm, https://dammedia.osram.info/media/resource/hires/osram-dam-5467144/SFH%202430_EN.pdf PhotoDiode, plastic SMD SmatDIL Resistor, LDR 20mm diameter, pin pitch 81.28mm 17W length 75mm width 9mm height 9mm Resistor, Axial_Power series, Axial, Horizontal, pin pitch=10.16mm, , length*diameter=5.2*2.7mm^2, , http://www.diodes.com/_files/packages/A-405.pdf Diode A-405 series Axial Horizontal pin pitch 10.00mm diameter 9mm Resistor, Axial_Power series, Box, pin pitch=30.48mm, , length*diameter=24*7.1mm^2, Vishay, IM-10-28, http://www.vishay.com/docs/34035/im10.pdf Inductor Axial series Axial Vertical pin pitch 20mm length 17mm diameter 6mm Resistor, Axial_DIN0918 series, Axial, Horizontal, pin pitch=15mm, , length*diameter=12*8.5mm^2, http://cdn-reichelt.de/documents/datenblatt/B300/STYROFLEX.pdf C Axial series Axial Vertical pin pitch 24.00mm diameter 24mm height.

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