Dell 1720 laserjet printr

Here is an excerpt I found from the W840 user manual. Looks like you need to change the photoconductor kit. Here is the link for the user manual: images.lexmark.com/publications/pdfs/w840/eng/ug.pdf
To ensure print quality and to avoid damage to the printer, the printer stops operating after the photoconductor kit has reached approximately 60,000 pages (Letter/A4). The message 84 Replace PC Unit is displayed when the printer reaches this point. If the Toner Alarm setting is set to Single or Continuous (default is Off), the printer automatically notifies you before the photoconductor reaches this point and displays the message 84 PC Unit Life Warning. To avoid having the printer stop operating, replace the photoconductor kit when you first receive the 84 PC Unit Life Warning message. Once the photoconductor kit has been replaced, normal printer operation resumes

You need to replace. It is also called the drum unit.

http://www.nextag.com/dell-1720-photoconductor/shop-html

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Thanks, Joe

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If the printer has been in use for some time, then this message is correct as parts do have a limited service period and need to be replaced.

84 PC Life Exhausted indicates that the photoconductor unit has reached its functional life. The photoconductor kit will need to be replaced. The printer will not function so long as the Exhausted message remains on the display. The only way to clear the message is to install a new photoconductor. After replacing the photoconductor unit, you need to manually reset the pc page counter as well. Thank you for choosing Lexmark.

The photoconductor kit is another word for the drum or imaging drum. All three words refer to the same part.

Here is a link from the Dell site for this model.
http://accessories.us.dell.com/sna/PopupProductDetail.aspx?c=us&l=en&cs=dhs&sku=310-5404

Once you replace the drum, the printer has to be manually reset. If this is not done, the printer will continue to give this print out. By resetting it, the counter is set back to zero. The drum is good for around 30k prints.

From the Online Manual for the 1700, to reset the counter:
http://support.dell.com/support/edocs/systems/1700n/en/index.htm#online_documentation

To reset the counter, press and hold the Cancel button until all lights flash in sequence.

NOTICE: Resetting the imaging drum's counter without replacing the imaging drum may damage your printer and void your warranty.

Not sure about the part #, but photoconductors and imaging drums are the same thing.

The Drum which is a separate part has reached it's end of life. WHen you pull out the toner cart, you press a little button that separates it from the drum. that drum also comes out. You can tell it's the drum becuase of the green roller. You can go to support.dell.com for info on removing the drum if you don't have the manual.

*Note* When you replace the drum, there is a procedure for resetting the drum count. The printer doesn't actually know you replaced the drum. You basically have to tell it. Now this trick will get the printer working right now with the old drum. However, you still need to get it replaced.

THis link will tell you how to replace the drum and reset the count. The directions are for the 1720, however, it will work for the 1710 as well.

http://support.dell.com/support/edocs/systems/prn1720/en/1720_en/en/d0e4183.html#maintaining-your-printer-chapter

you must reset the error message; find the explanation in the photoconductor kit package

I believe this message is occur because the laser printer drum needs to be replaced, not the toner cartridge.

These are two different things. The part is a DELL 310-8710 Drum Unit. Just google DELL 1720N drum and you should be able to find one.

The second link was the helpful information. Also, to cut through all of that --

If you need to reset the counter:

1. Remove drum kit with toner

2. Make sure all print jobs are flushed otherwise whatever has been sent and not printed will come spewing out.

3. Hold down CANCEL Button until all lights flash through.

4. Slide the drum kit and toner properly into the Printer.

done.