I received the new chip sets for my WF 3640, installed them and the printer is working great again. Thank you very much, I thought I was going to have to buy a new printer. I can't believe how the printer manufactures do people after buying their products. You do a great service for people. You save me a lot of money in printing expense. Just want to say how much I appreciate you working with me on the phone to figure out the problem. Thanks again,
R. S