| Interval | Action | |----------------|--------------------------------------------------------------| | Every 200k prints | Inspect CN2 connector for pin oxidation. Clean with contact cleaner. | | Every 500k prints | Replace thermal pad between Q1–Q6 and heatsink. | | Every 1M prints | Recalibrate current sense: adjust pot VR1 until V_sense = 0.3V at 6A load. | | As needed | Check fan (if external) blowing over driver board; replace if <800 rpm. |
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