Question about Samsung SF 5100 Laser Printer

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Double page copies and CRU Error

Hi, I have a problem where incoming faxes are printed twice (90% of the time). I have an error on my LCD that says "CRU fuse Error" which i dont find an explanation for in the technical manual. When i print out a system data list it says there on top "CRU PRINTS =2? I dont know how to change this or if this is the reason for the double printing. I'm not even sure what CRU actually stands for because it doesnt mention it in the manual. Any help with be greatly appreciated.

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CRU Fuse error equates to a problem the machine has reading the print cartridge installed in the machine. It has nothing to do with the fuser.
Suggest that you change the print cartridge.

Posted on Oct 23, 2008

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Can you please explain me about the meaning of CRU Prints in Samsung SCX - 4521F report

Posted on Jul 22, 2009

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CRU stands for "Current Use" and it appears on the System Data List as part of the page counters. The System Data List can be printed through the "Report" menu. Your unit is rather old and the fuser unit for it is intended to last 60,000 pages, although It can also be damaged by power failures. The part number for your fuser is JC96-01621A. This part number might have changed, but the expected price for it is around $99.00 to $129.00. Good luck.

Posted on Oct 02, 2007

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How to solve CRU Fuse error ?



Check the TONER Cartridge and Reinstall it


CRU Fuse Error
Means : The toner cartridge is not installed correctly


You can set the machine to ignore the “[Toner Empty]”
message and to continue printing incoming faxes.

Ignoring the Toner Empty Message

1 Press Menu until “Machine Setup” appears on the display.
2 Press the scroll button < or > until “Ignore Toner”
appears on the bottom line and press Enter.
3 Press the Scroll button < or > to select “On” or “Off”.
Select “On” to ignore the [Toner Empty] message.
Select “Off” to stop printing incoming faxes when the
message appears. This is the default setting.
4 Press Enter to save the selection.
5 To return to Standby mode, press Stop/Clear.

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Fax can do copies and send but not able to receive incoming faxes. Did several tests. Modem picks up but doesn't transmit data. LCD screen does not indicate any trouble or alarm.


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