brother dcp t420w head cleaning

this vedio made for how to clean print head without laptop/pc .
Print head without laptop/pc,
Press. (Stop) and Copy Shortcut simultaneously
Press and hold Mono Start and Colour Start simultaneously, for five seconds.
How to Check the Print Quality
Press. (Stop) and Copy Shortcut simultaneously. ..
Press Copy Shortcut. The machine prints the Print Quality Check Sheet.
Check the quality of the four colour blocks on the sheet.
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