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16.Check the nozzle test

Use a white flashlight to check the nozzle test, 

because some of the nozzles are white and transparent.

Refer to the following video ：

Nozzle test picture  As shown ：

If any nozzle is in poor condition, continue to Load ink corresponding print head separately.

Then clean all heads with weak for 2-3 times，and check nozzle test again.