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Error 5100 is carriage error. Carriage is printer's cartridge holder. This means that there is some problem with printer's carriage, you'll need to check the plastic stick (around 1/4" wide). Also, check for any obstructions in the printer's carrriage path ( like small bits of paper stuck under carriage or any kind of paper jam).
Turn off the printer and remove the cartridges and reseat them after cleaning the carriage's bottom area with a Q-tip.
Error 1203 occurs due to smearing of ink on the carriage bottom where the cartridge head touches the carriage bottom. Please turn off your printer and unplug it.
Clean the bottom of carriage with a damp cloth and clean any dried ink. Make sure that you use the printer after 5-10 mins or until the carriage area dries up completely.
If the 1203 message is still present on the operator panel, you need to insert one cartridge at a time to determine which cartridge is producing the failure.
Now try and check whether you are still getting an error. I hope that you are using orignal Lexmark ink. If not then please use genuine inks only.
You either have a bad toner cartridge or have a problem with the fusing assembly. If it's the fuser will need to have the fuser replaced.
Here's how to tell which it is. Measure the distance from the original image to the first time it repeats on the page.
30.8mm (1.21") = toner cartridge
76.3mm (3.0") = toner cartridge
41.0mm (1.61") = fuser
56.5mm (2.22") = fuser