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Both LED's usually indicate bad fuser unit. This is common after a power failure or voltage surge. Your unit is out of warranty, and a new fuser will most probably cost you around $90.00 - $110.00. I beleive a new unit will be your best shot.
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I guess you should try to reset it ..and get the cartridge out and see if the toner (ink ) is getting out ..by pressing it (with the part where you removed the tape ) on some absorbent paper ..when it is working well it should leave a mark on the paper ..the mark should be not washed ...but real color and all... If it do not ..just use a syringe and blow air in the cartridge ..just to agitate it ..and make sure it is not dry .. Insert it back ..repeat the procedure until works ..and also if you have the procedure ..reset it .. http://www.ehow.com/how_6881778_reset-2600n-toner-chip.html
Did you purchase a new OEM HP toner or a refilled or remanufactured toner. It is possible that the chip is bad on the cartridge in which case if it is a true HP cartridge have them replace it. If you purchased 3rd party go after the vendor to replace it.
If you changed toner because old was empty and now you have this defect with the new cartrige, it is most likley a defective cartridge. Try the old cartridge again, if it prints clean, then you know for sure it is the cartridge. If you purchased a new HP cartridge, get it replaced by HP, they warranty their toners against defects. If you bought a 3rd party toner, return it to where you bought it and get them to replace it. If you had your old toner refilled by someone, get your money back, they don't know what they are doing. This type of defect is often caused by a filled waste toner bin then then runs back out when you print. Some refillers just throw toner in and don't empty the waste toner bin.
There is a reset gear in the cartridge that needs to be "reset" or replaced. I've included a link to a PDF file that goes over the procedure to properly refill and reset the toner cartridge. This is a document that is used by a company that does a complete rebuild, so you probably won't need most of the information, just the part on resetting the reset gear.
Step one: Prepare the print cartridge
To prevent damage to the print cartridge, minimize its
exposure to direct light. Cover the print cartridge with a sheet of
Follow these steps to make sure the new print cartridge is ready to install into the product.
the new print cartridge from the packaging. Gently rock the print
cartridge from front to back to distribute the toner evenly.
To prevent damage to the print cartridge, hold the print cartridge at each end.
Pull the tab and remove all the tape from the print cartridge. Put the tab in the print cartridge box to return for recycling.
Step two: Open the product
Make sure you have turned the product on. Press the Power
button if it is not lit.
Open the print cartridge access door, and then wait until the carriage is idle and silent.
Remove the old print cartridge. See the recycling information inside the print cartridge box.
If you cannot remove or
install the cartridges even though the power is on, check the product
control-panel display for error messages. If none appear, turn off the
power and then turn it back on.
Step three: Replace the old print cartridge
Insert the new print cartridge in the product. Make sure the print cartridge is in position.
Close the print cartridge door.
If toner gets on your clothing, wipe it off with a dry cloth and wash the clothing in cold water. Hot water sets toner into the fabric
Download the firmware from herehttp://org.downloadcenter.samsung.com/downloadfile/ContentsFile.aspx?CDSite=in&CttFileID=2238869&CDCttType=FM&ModelType=N&ModelName=ML-1640&VPath=FM/200904/20090416100856890/ML-1640_V1.01.00.83.exe run the software and this will reset the page count to 0. Samsung printers generally do not support a refilled cartridge and thus the red light.But resetting the page count to 0 makes the printer detect the cartridge as an intoductory one.
Two possible problems:
1. You actually got a partially empty new toner. This has happened to me once.
2. The sensor on the printer is dirty and not seeing the toner. With the toner there is a little wipe that says it is for cleaning the LED. There is an LED sensor that "reads" the presence of the toner. If this is dirty it will think there is no toner cartridge.