You will have to contact hp customer care or the vendor you got the kits from. One suggestion if printer speed is not important. These printers have a setting call quiet mode in the setup menu. It slows the printer to the same speed as the manual feed tray and also cuts down a lot on the noise these printers make. I would think in the long run they would also help in extending the life of the fusers since they will not have to get as hot and wear and tear will be less with the slower speed.
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