1, check the 220V power supply is normal;

　　2, electronic scales within each voltage circuit is normal;

　　3 supply voltage is normal, check the printer, when printing current is too large;

　　4, focus check the AD circuit voltage stability, otherwise check if the sensor is normal.

　　5 digital circuit power supply is normal, check the circuit board, focus on Crystal element may be damp or damaged.

　　7, displayed after power on digital electronic table scale instability or hop, belong tothe circuit or sensor bad AD, focus on this part of the voltage must be stabilized to normal.