Bad quality HP 790 plotter

I guess because of following causes but please introduce me about troubleshooting this problem.

  • cloging and entering air into the plotter heads(vaccum problems)

    Votes: 0 0.0%
  • use old charge ink bottle for more than 2 years

    Votes: 0 0.0%
  • misconfiguring paper weight 170 gram china coated paper into heavy coated paper on the panel or beca

    Votes: 0 0.0%
  • other causes

    Votes: 0 0.0%

  • Total voters
    0
Joined
Sep 18, 2016
Messages
1
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
 

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