canon c7000 - color issue

[FriendshipCreative]

we have been experiencing drastic color shifts after a couple hundred sheets.
we have to do a auto gradation adjustment to get the color back where it needs
to be. our service techs are great but even they are stumped. has anyone else
seeing inconsistent color or colors getting extremely hot.
thanks,
Friendship Creative Printers

 

[Prepress_Parasite]

When was the last time your developers were changed and how many click do you have now? How is the machine placed with attention to climate control?

 

[idadunit]

Just the Autograd on its own wont always fix the problem. Dont forget to do Shading Correction, then a full internal Autograd then calibrate your controller. All three together will help keep the color consistent.
Also keep your environment as stagble as possible as this has the biggest influence on your CQ.

 

[FriendshipCreative]

thank you for the responses. our tech was able to pin-point the problem.
our laser heads needed to be cleaned. we've have run all day with no problems.

 

[StrikTenn913]

Great advice PrePress and idadunit. You're both absolutely right.