Jymc220bi Schematic 2021 Updated Jun 2026

| Reference | Part | Value/Model | Quantity | |-----------|------|-------------|----------| | U1-U3 | Optocoupler | PC817C | 3 | | U4 | Buck converter | LM2596S-5.0 | 1 | | U5 | LDO | AMS1117-3.3 | 1 | | U6 | Stepper driver | TMC2209-LA | 1 | | D1, D2 | Schottky diode | SS34 | 2 | | R1-R3 | Resistor | 330Ω 0805 | 3 | | R4-R6 | Resistor | 10kΩ 0805 | 3 | | RSense | Current sense | 0.1Ω 2512 | 2 | | RV1 | Trimpot | 10kΩ 3296W | 1 | | C1, C6, C7 | Ceramic | 100nF 0805 | 3 | | C2, C3 | Electrolytic | 220µF/50V | 2 | | C4, C5 | Ceramic | 10µF/25V 1206 | 2 | | FB1 | Ferrite bead | 120Ω/100MHz | 1 |

Most boards have small adjustment screws (trimpots) labeled for Min Speed , Max Speed , and Torque (IR Comp) . Use a non-conductive screwdriver for adjustments while the machine is running. jymc220bi schematic 2021

If you are using the schematic for repair, pay special attention to these four areas, as they are the most frequent failure points in 2021-manufactured units: | Reference | Part | Value/Model | Quantity

The board uses clearly labeled terminal blocks for essential connections: AC Terminals: Connect to the 230VAC mains power supply. M Terminals: Connect to the armature of the DC brush motor. F Terminals: Typically for field windings in shunt-wound motors. P Terminals (P1, P2, P3): M Terminals: Connect to the armature of the DC brush motor