Waste Ink Pad of Dual XP600 ACHI UVDTF Printer

What time ink pad of ACHI UV DTF Printer need to need to be replaced ? Firstly, The ink can not be extracted from waste ink tube . Secondly , When extract ink from waste ink tube , you can not feel any pressure . Thirdly , When use ink seal the edge of ink pad and fulfill cleaned water on the ink pad , you find ink pad leakge and can not extract cleaned water from waste ink . As summary , The ink pad need to be replaced new one .