Did you figure this out? Does the Juki DDL-552 zig zag (304) or just straight stitch (301)?
Are you trying to adjust the length? the zig zag width? or the actual TYPE (eg. locking stich, blind stitch) of stitch?
Here is a threading diagram for this industrial machine
http://www.sewusa.com/Threading_Diagrams/Threading_Pages/Juki_Sewing_machine_threading/Juki_552_553_555_227_Threading_Diagram.htm
You can also buy a manual here
http://www.sewusa.com/Sewing_Machine_Manuals/Juki_Manuals/Juki_Industrial_Sewing_Machine_Manuals/227-552-553-555_Instruction_Manual.htm for this model.
I would have thought there would be some sort of screw or adjustment to control stitch length but I can't find an image for your model.
However this image might help, http://www.johnharbsew.com/images/threading/JUKI-DNU-241-TD.jpg, my Singer 20U, has a dial like this with numbers on that you adjust for length, is there something similar on the Juki?
2 - Check whether 110V/220V changeover switch is improperly set.
3 - if 400 volt is input means POWER P.C.B is broken maybe repair or need to change.
best regards
ashraf abozid
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