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Message: [QUOTE="Ali sarab, post: 208248, member: 9322"] My quality images intermittently become bad but I don;t know the cause or causes of this quality problem(my machine HP T790 plotter) I guess because of following causes but please introduce me about troubleshooting this problem. 1- cloging and entering air into the plotter heads(vaccum problems) 2- use old charge ink bottle for more than 2 years 3- misconfiguring paper weight 170 gram china coated paper into heavy coated paper on the panel or because of bad paper quality 4- other causes thanks a lot for your suggestion and solutions described please introduce and explain your solutions [/QUOTE]