I have had a new PCU all colours are relatively new half full, I have noticed a gradual degrade of the red output, I have done a Epson test page there is a reduced blue & red and no yellow what so ever yellow appears on the toner when removed
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Depending on where the problem originates, this could be a bad wiper (cleaning) blade, faulty corona, or incomplete fusing.
If the distance between successive images is equal to the circumference of the photosensitive drum, it is a wiper blade, erase lamp, or corona problem.A residual latent image or residual toner is sticking to the drum and not being properly cleared.
If the distance between successive images is equal to the circumference of one of the fuser rollers, then the fusing may not be complete due to damaged rollers or an incorrect temperature setting.
It is easy to determine where the problem is located: Interrupt a printout in mid-stride (where part of the paper is between the toner/developer and fuser. If the un-fused image has ghosting, it is a fault in the area of the drum
If the line is only red or pink, it is most likely caused by the magenta PCU. Replace this PCU and your problem will go away.
Occasionally the magenta developer unit can cause a red or pink line, but the problem is more than likely from your magenta PCU. The PCU is easy to replace, and instructions will come in the box if you order an OEM replacement unit.
The PCU is the drum unit. There is one for each colour (C,M,Y & K). Each PCU has a 'life' and the machine will ask you to replace it when it has reached the end of its expected life. The PCU life has nothing to do with the amount of toner that you have in the cartridges and they need to be changed independantly.
This could one of a few fairly major problems.
The easiest way to track down the fault is start by replacing the consumables - make sure you install them in the correct positions - it is possible on the C1100 to put them in the wrong places!!
Change the toners first. Most importantly the magenta and yellow. Print several pages. Use MS Paint or similar to create a page with all four component colours on (cyan, magenta, yellow and black)in large blocks (see image below) and print them full page.
Now look at the print and see if any one colour is missing or has reduced density.
If you have a spare PCU you should but that in next.
Let me know what the print outs look like and we will progress to the next step.