Try another outlet if no & you sure that outlet is working well then you can check it`s power board & fuse.
SOURCE: problem scanning with samsung scx 4521f
My connection is via a parallel to parallel cable, and I am also having a similar problem. I'm reading that usb to usb cable is the only way it will properly function. good luck with it!
SOURCE: Samsung SCX-5421F Laster Printer crashes my pc
Have you tried uninstalling and re-installing the software. Perhaps there is an updated driver for your system since you first installed it, or maybe yours is simply corrupted. I would suggest removing and reinstalling will solve the problem - if, in fact, that is your problem -I've not heard of this happening before.
Drivers are here if you need them:
http://www.samsung.com/ca/support/download/supportDown.do?group=printermultifunction&type=printermultifunction&subtype=monochromemultifunction&model_nm=SCX-4521F&disp_nm=SCX-4521F&language=&cate_type=all&dType=D&mType=DR&vType=&prd_ia_cd=06010300&model_cd=&menu=download
SOURCE: samsung scx-4521f lsu erarr problam
kindly check the LSU main pba cable damaged or not ?
no problem found, kindly check with the replacement of Main pba or LSU.
SOURCE: I want to download driver for my Samsung
Good day Sir, You can download your Samsung scx-4521f driver in the link below.
Printer Driver
Have a nice day.
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