10.Counting roller replacement When the counting roller damaged, it wil cause counting not fluently or correct. Open the top covey, loosing the screw of roller axis machine. Replaced oid roller. Then fix the machine Insides. = New rioter 11.Maintenance -Do not aerate the unit In areas with high temperature ar high humidity since it may damage the macho When nat using the unit for a long period of time, remove the power plug from the wall outlet. Never operate the unit under strong light.