If your board proves beyond repair, suitable replacements are available from several sources, though at a higher cost than a successful repair. With patience and the right diagnostic techniques, most JYMC boards can be brought back to life, extending the service life of your valuable equipment for years to come.
The is a motor speed control board commonly used in mini lathes like the CJ0618. While full internal schematics are often proprietary, the wiring and technical configuration are well-documented for installation and troubleshooting. Key Specifications (2021 Model) Input Voltage : 230 VAC (50/60 Hz). Output Voltage : 0-180 VDC. Current Rating : 12 ADC.
Alternative boards like the if you need a replacement. jymc220bi schematic 2021
A: No – the JYMC series uses simple voltage control without dynamic braking. The motor will coast to a stop when the speed pot is turned to zero. Regenerative braking would require a more sophisticated controller.
Inspect the primary bridge rectifier. A shorted internal diode will bridge AC directly to ground. If your board proves beyond repair, suitable replacements
Provides overload protection (typically rated 5A to 10A depending on the motor). 2. JYMC-220BI Terminal Pinout Wiring Guide
: The "220B-I" designation typically signifies a 230V AC input rating with a current capacity often around 12A , though variants for 110V/120V systems (like the JYMC-220A) also exist. Protection Features : While full internal schematics are often proprietary, the
The operational amplifiers, timing chips, and optocouplers on the board cannot function directly on a 220V DC bus.
If the motor won't turn but the board has power, a shorted rectifier or a blown electrolytic capacitor is often the culprit. Voltage Drops:
: Standard 4.7k ohm potentiometer used for speed adjustment. It often includes an integrated safety switch that must be closed (turned to zero) to reset the circuit before changing spindle direction. On-Board Trimpot Adjustments