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Print head temperature rise error  - Print head (QY6-0042) - Logic board ***'y (QM2-1520)
Before replacement of the logic board ***'y, check the waste ink amount (by service test print or EEPROM information print). If the waste ink amount is 7% or more, also replace the bottom case unit (QM2-1249) or the ink absorbers (QC1-4222 / 4223 / 4224 / 4263 / 4264 / 4864) when replacing the logic board ***'y. See 4. SERVICE MODE, for details.
www.lexmark.com/publications/pdfs/form2400/en/enUser.pdf Shows you how in above manual. .
Turn off printer
Move print-head all the way to the left, so it's hitting the left hand wall of the printer.
Hold down Alt and Setup while turning printer on. Keep pressed down until you hear the beep and the printhead moves. This can take 5-10 seconds. Hold in the keys and make sure the printhead is over to the left when you do.Note: The printer defaults to IBM mode, this is fine in MEDENT except for letters and prescriptions. If you do factory default and they don't print MEDENT letters or prescription then make sure MEDENT printer setup for type 11 (IBM mode). If they do letters or prescription, then change the printer setup to Epson mode See Also: Switch Emulation Mode from IBM to Epson
Your going to need to check your head drive belt, being that the printer is so old the belts go bad and start to crack and turn into a tar sub. Also make sure to clean your rails, over time they build up dirt and oil and need to be cleaned off.
Hi, It's been a while since I worked on these, so I'll go out on a limb (as far as my rating goes) and say that the few times I've seen that happen usually results from a bad network card. Now you may not be using a network card, so if your not then I'm not really sure what would cause that to happen on the printer side. The environments that I've seen that happen in are with an AS400 and the network card just gave out. You most likely tried this, but you might want to make sure that the computer isn't using one driver for both printers. Good luck.