Question about Lexmark T640 Laser Printer

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Why is lexmark T640 laser printer producing black copies after replacing a new toner cartridge

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Be sure that the main charge roller did not come off of it's holders. I have seen them come off and get thrown out with the old cartridge. If you take out the toner and lower the display cover and look inside the printer you should see the dual roller assembly drop down if it is missing then you will not get a charge to the drum and therefore will get black pages.

Posted on Jul 07, 2011


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1 Answer

What is a "Region Mismatch"

This error message is caused by installing a cartridge toner from a different region (e.g Canada toner installed on US printer). You can check the region for your printer at the side of the serial number.
If you need further assistance you may contact Lexmark Technical Support Center.

Aug 12, 2011 | Lexmark T640 Laser Printer

1 Answer


Your toner (ink) in the printer is running out. You should be replacing it soon.

Details on how to replace the toner cartridge are on the link below:

Apr 12, 2011 | Lexmark T640 Laser Printer

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We have a Lexmark T630 and are experencing a black line on the right side of the copy from top to bottom. This started as soon as we replaced the old toner cartridge with a new one. What can be down to...

try testing with the old cartridge if possible. If not i still would replace the cartridge. any time a problem arises after a cartridge replacement it is normally the cartridge

Jan 25, 2011 | Lexmark T630 Laser Printer

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Problem can be caused by either the dual charge roller, located above the cartridge. Take out the carttridge and lower the front cover for 1/2, then you will see the dual charge roller. Partnumber 40x0127.
Or the High Voltage Power Supply (HVPS). This board is located unther the cover below the cartridge. Partnumber 40X4275

Dec 14, 2010 | Lexmark T640 Laser Printer

2 Answers


Usualy this is a toner cartridge problem. Try changng it with a known working toner cartridge.

Jun 09, 2010 | Lexmark T640 Laser Printer

2 Answers

Lexmark T640 squeaks when it prints. It sounds like it is coming from the fuser area, but I can't be for sure. It seems to happen a lot around here (we have over 100 lexmark printers). Can this be fixed...

That can be caused by several factors(e.g. small paper stuck inside the printer, the roller or the toner cartridge). But here's a link to the Lexmark website to guide you on what to do when having this kind of problem on the Lexmark T640 printer. Hope this helps. If all else fails, I suggest you contact Lexmark Technical Support for further assistance.

May 17, 2010 | Lexmark T640 Laser Printer

1 Answer

Lexmark T640 print black page

if the printer is kicking out all black pages a couple of things can cause this first open both front doors and remove the toner cartridge. leaving the lower front cover open slowly lower the top cover watch the charge roller as it lowers with the lid make sure it is comming down striaght. if it is replace the high voltage power supply

Nov 20, 2009 | Lexmark T640 Laser Printer

1 Answer

Error code 917.00 "service transfer roller" won't clear

This is a transfer roll error. Take the toner cartridge out and clean the area under it. The transfer roll is a roller which is right under the toner cartridge. make sure the ie is clean . It may need to be replaced.

If I could be of further assistance, let me know. If this helps or solves the issue, please rate it.
Thanks, Joe

I’m happy to assist further over the phone at

Jun 30, 2009 | Lexmark T640 Laser Printer

1 Answer

Lexmark t640 error message

Lexmark does not now nor have they ever endorsed or supported the use of OEM toner or cartridges.

In fact, use of such products voids the printer warranty.


Apr 06, 2009 | Lexmark T640 Laser Printer

1 Answer

Print quality on Lexmark T640

There are 2 likely possibilities:
1. Very dark print usually indicates your charge roller is not removing the charge from the drum.
The charge roller "erases" the charge laid down by the laser from the previous pass and prepares it for the next portion of the image. If not erased or has a latent charge it will pull toner onto the drum. Try changing the charge roller . 2. Your wiper blade in the cartridge may not be properly wiping excess toner. Swap the toner cartridge with another and see if the problem goes away.
There is a video here you can watch on changing the charge roller:

Mar 24, 2009 | Lexmark T640 Laser Printer

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