I am using EPSON L1800 for the past one year. For the past two months, the colors of print is not good. Mainly yellow colour is not correctly printing. Head cleaning is done and on nozzle check, everything is fine. But the problem is not solved. So we replaced the print head with a new one. But still the problem is not solved. Can anybody help me in this case. Local epson peoples cannot able to find out, where the problem is.