How to check the recycle pump function of Leadjet CIJ inkjet printer

First, tear down the Input pipe of recycle, and use a empty washing ball into the input port.
Then, Long press 'About' enter the factory mode, password is 49881111.
and then, set the Air Pump Test value '500'
At last, check the washing ball situation. If the ball is deflation, it means the pump is working. If the ball is not change, the pump is issue. You can add the solvent into the recycle pump by washing ball, if still issue, the pump is broken, need replacing.