Why does the blue color appear on the sides

[BIILEL]

Why does the blue color appear on the sides, and this only happens with black?

[Minilab service]

Color is not Blue. It is Cyan. If I see correctly Cyan is from all sides. Might be Red laser head focus is bad. Pint color position aligment test. Then you can see Cyan line is focussed ( narrow ) , of focus is bad ( line is wide ) .

Edited June 16 by Minilab service

[BIILEL]

Is there a solution? 

[Minilab service]

When can't see color aligment test print can't be sure focus is good, or not.