Coats Wheel Balancer 1004 is a high‑speed centrifugal balancing unit that uses a solid‑state control board to drive the motor, read sensors, and manage user interface functions. Common failure points on this class of equipment include power supply voltage drops or ripple, damaged input/output traces from vibration, burnt fuse or MCB protection devices, and degraded potentiometers or limit switches that can cause mis‑readings or stalled operation. First‑check diagnostics: verify 48 V DC rail integrity with a multimeter; inspect the board for burn marks, cracked solder joints, and ensure all fuses/MCCs are intact; then review any error codes displayed on the panel and confirm I/O signals to the motor driver match expected logic levels.[oss-gpt-20b]