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→OEM No. 127 (A/B) — HV Controller Board
This is the analog/digital control board that bridges the front-panel microprocessor and the high-voltage power module. It accepts a digital setpoint from the μC, generates two PWM drive signals to control the HV switcher, and reports back the actual HV and HC values via a frequency-isolated telemetry path. It also handles fault detection and shutdown latching.<gallery mode="slideshow">
File:BIO-RAD OEM NO 127A Top.jpg|'''127A''' - Top of board, J-16 and optocouplers in bottom left
File:BIO-RAD OEM NO 127A Bottom.jpg|'''127B127A''' - Bottom of board, cutout under optocouplers in top left for high voltage isolation
File:BIO-RAD OEM NO 127B Top.jpg|'''127B''' - Top of board, J-16 and optocouplers in top right
File:BIO-RAD OEM NO 127B Bottom.jpg|'''127B''' - Bottom of board, cutout under optocouplers in top left for high voltage isolation