quality issue

[mohamed40]

hello

a costumer call me for a print quality issue after i have seen that all the nozzles printing in black color then i decided to replace the print head kit  after  we make cleaning head several times 

i replaced the print head with a new one and every thing was perfect 

a four month later the same costumer call me for the same issue i go there and fide that there is a black ink in the other colors

i make print head cleaning and it worked fine 

a week later it is return to the same problem

i have another costumer with the same problem but  the print head is working in the printer for more than 3 years 

 

this is the diagnostic print 

i have another diagnostic print for another t830 for different costumer with same issue

  

[Repairatrooper]

Is there any ink inside the printer that would suggest a printhead leak? It is possible that you have a defective printhead and if it is still under warranty I would contact HP tech support and arrange for a replacement. support.hp.com

[mohamed40]

Hello 

Thanks for your answer 

But the old printhead  that I  replaced  before have the same problem when I print diagnostic 

test print all the colors was black . and do not reach the time or the ink quantity that must to fire 

Because of this reson I have a suspect that  svs or prime pump is not functioning properly.