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No, you must change only the toner cartridge that has finished. It would be quite a waste to replace a toner cartridge that's not empty. Here are the codes for each cartridge, to know which one you need:
-CB540A Black Toner -CB541A Cyan Toner -CB542A Yellow Toner -CB543A Magenta Toner
Don't know about your "primed" toner, but go to Diagnostics and run the PQ test. See what that looks likes. Go to Disable Cartridge Check and swap the black and cyan toner. Run another PQ test. Are the lines still there and are they black or cyan? If they are cyan, the cartridge is bad. If they are black it's not the cartridge. It going to take a tech to look at it.
Cause is dirty lenses and or mirrors in the laser unit.
This happens over time (as the laser unit is not sealed), and particularly if you've had a leaky toner cartridge. Unfortunatly there are a lot of poorly remaufactured, leaky cartridges around for these printers.
Solution is remove laser unit, open it, clean lenses and mirrors (very carefully to avoid disturbing alignments, and scratching).
The laser unit is deep in the printer, so it's quite a lot of work, but very rewarding when you've fixed it.
Alternatives - buy a replacement laser unit and swap and clean old one at leisure, or get an exchange refurb printer - if you think your mechanical skills aren't up to it.
It is the developer. All colours should be changed at the same time. This can be accessed via the right hand side of the machine, when you remove the cover. (where the output tray is)
I had the same problem and found that one of the toner cartridges must have not been seated properly. I removed the black toner cartridge and re-fitted it. The printer now works fine again with no errors. 17H is a code relating to a fault in the rotation ......... possibly one or more toner cartridges need checking. Use the menu on the printer to turn it to the appropriate position (i.e. engine menu then select replacement of whichever toner you are checking).
Hope this fixes your as well.
Chris
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