Jymc220bi Schematic Full ((exclusive)) Page

: Adjusts the acceleration time (0.5 to 4 seconds) for a smooth start.

If the board is completely dead, check the glass fuse on the board or in the machine's control panel.

Shorted Power MOSFETs/IGBTs or a shorted Bridge Rectifier.

Disconnect input power entirely. Use a multimeter to test continuity across the main power SCR components mounted directly along the primary aluminum cooling heatsink. Replace any shorted components or swap out the entire logic board assembly. Symptom 2: Blown Main Line Fuses Upon Powering On jymc220bi schematic full

Are you attempting to on your JYMC-220BI board, or are you looking to wire it up to a specific machine? JYMC Variable Speed DC Motor Controls - Circuits Online

If the speed is erratic, the external 5k or 10k potentiometer may have a "dead spot" or worn-out wiper.

High, Center Wiper, and Low Legs of the Control Potentiometer Interlock Switch / Enable : Adjusts the acceleration time (0

The official schematic is not publicly distributed by the manufacturer, Yanzhou Jiayi Mechano-electronics Institute. However, the following sources may contain partial schematics, service information, or board photos that can help:

: Inhibit circuit terminals used to electronically reduce armature voltage to zero.

Connects directly to the DC brush motor. Disconnect input power entirely

Most JYMC boards feature small, adjustable blue or white potentiometers soldered directly to the board to fine-tune operations. Be very careful adjusting these while the board is live:

On the surface of the board, you will find three micro-adjustable trimpots used to calibrate operational thresholds. Do not adjust these without a digital multimeter.