With power OFF , check resistance across L1 and L2. It should not read a dead short.
Many websites claim to sell the "official schematic" – these are scams. The legitimate way is to buy one board ($8–$12) and trace it yourself. jymc220bi schematic 2021
External controls interface with the board via low-voltage header pins: With power OFF , check resistance across L1 and L2
If you own a mini lathe like the CJ0618, you’ve likely encountered the JYMC-220B-I control board The legitimate way is to buy one board
Before diving into the circuit traces, the primary operating tolerances of the board must be understood:
Power Switching (MOSFETs/IGBTs)The low-power signal from the control chip drives large power transistors. These components do the heavy lifting, rapidly switching the DC bus on and off. Because this switching generates significant heat, the 2021 schematic layout prioritizes the placement of these components against a large aluminum heat sink.
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):
With power OFF , check resistance across L1 and L2. It should not read a dead short.
Many websites claim to sell the "official schematic" – these are scams. The legitimate way is to buy one board ($8–$12) and trace it yourself.
External controls interface with the board via low-voltage header pins:
If you own a mini lathe like the CJ0618, you’ve likely encountered the JYMC-220B-I control board
Before diving into the circuit traces, the primary operating tolerances of the board must be understood:
Power Switching (MOSFETs/IGBTs)The low-power signal from the control chip drives large power transistors. These components do the heavy lifting, rapidly switching the DC bus on and off. Because this switching generates significant heat, the 2021 schematic layout prioritizes the placement of these components against a large aluminum heat sink.
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):