We all jump in five-color machines. If there is nothing wrong with the circuit, it will be fine if the ink key of API function returns to zero. If there is something wrong with the circuit, you have to analyze whether the small motor is broken or the circuit board is broken. Almost all analytical methods and ink key adjustment can be analyzed. Mitsubishi ink keys are the worst. Printing things every day makes me exhausted. One is broken, and the boss can't fix it.