I recently purchased this item used online and it was working fine, but about three weeks later, it suddenly stopped powering on. I suspect the fuse may have blown, but I'm not sure. Is anyone able to repair it, or are you considering sending it to the manufacturer for repair? Aside from the power issue, the unit is in very clean and good condition. There were no problems when it was working. The unit only, no manual or other accessories are included. Filters, etc. are installed in the unit. There is no original box. #bookbazar