Machinery CNC planer slot machine malfunction causes failure: sliding block and guide the orientation of clearance is too large, the abnormal noise. Such failure is due to the guide rail with long time, which resulted in increased clearance is wear. Need to check the guide plate wear degree, depending on the degree of wear and tear to determine whether to replace the guide rail clamp, readjust the clearance to conform to requirements. Fault 2: after gear transmission failure. After material failure because the shaft with synchronous belt transmission wheel key from or synchronous belt slippage. Such failures need to assembly good article key and synchronous belt, and check the electric parts. Three: after the fault gear material beam linear guide and mold center line parallelism deviation is too big. Such failures to unscrew & other; X” Axis synchronous belt, to readjust to the parallelism tolerance range, the device of synchronous belt. Fault 4: loose oil cylinder connected with the slider, cause bending Angle is incorrect or the machine can't find a reference point. Such failures need to check the twist slider and cylinder coupling nut.