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Typically the only reason that a printer beeps when printing is because you have the printer plugged into a UPS. None of the circuit boards on the 4350 have any sort of audio capability. Plug the printer right into the wall outlet.
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usely it's the fuser sleeve the problem. replace the fuser but before be shure the cartridge is ok. print something and open the cartridge door when printing to see under the cartridge the print quality if ok replace the fuser unit
Symptom: Your LaserJet 4350 prints just fine until you try to print a double-sided page. Then you see the page start to exit, pull back in, then stop. The Data light continues flashing green, and the display reads, "Processing..." There is no error indication, but the machine won't print the second side and continues to hold the half-printed paper in the duplexer. If you open the top cover and close it again, the printer will eject the page, then try to print the whole thing again, unless you're quick enough to cancel the job first.
Cause: The printer is expecting a different sized paper than what it's running. Often it's not the menu settings, but a little lever in the paper tray itself. Pull out the paper tray you're trying to print from and look for a little blue lever on top of its right-hand side. The lever is labeled "Standard/Custom." Flip it to Standard (parallel to the tray side) and your problem should go away.
Does it occur on any print job or one in particular. If it happens with one job, that job has a problem. It isn't the printer. If it is all printing go the www.hp.com. then go to "support and drivers". Then select your printer, select your operating system, select firmware. Upgrade your firmware. Make sure that you read the instructions and DO NOT touch the printer while it is upgrading. If the firmware upgrade completes and the errors continue, you will need to replace the formatter.
Print a CONFIGURATION Page. On the 1st sheet/right side near the bottom will be a list of the trays that the printer detects. If all the trays are there, then your print drivers need to be reloaded. If the CONFIG page doesn't see the extra trays, then the tray may have a bad connector. You might want to try a COLD RESET.
You can go to www.printerworks.com and do a search for a 4200 model to get a diagram. I'm not sure what you were doing but make sure the fuser unit is seated in properly(two blue latches on fuser unit snaps right into the frame).
Most likely the fuser has lost part of the teflon from the heat roller. Having said that, the first step in any print quality issues is to change the toner cartridge. good luck!
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