Question about Lexmark T622 Laser Printer

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Charge roller How is the charge roller replaced? I replaced the other roller (accessed from the front w/toner cartridge removed) but can't figure out how to release the one in place to replace it. Any advice?

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  • 68 Hoople Sep 11, 2008

    Thanks for the help. I also finally located the info @ the lexmark.com site. There isn't much play to facilitate removal or insertion.

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With the toner cartridge removed and the front upper door open, look into the printer and lower the door, as you do so you will see the charge roller start to drop down. The roller can be released by holding it and gently pulling one of the supports away from it, then pull it out from the other side (this can be done using one hand whilst holding the door slightly open with the other).

Posted on Sep 04, 2008

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Clicking noise


Check the printer thoroughly for any small pieces of paper caught on a roller in the printer. If your printer is making a grinding noise, you may have a loose gear or roller in the printer.


If the noises started shortly after you installed a toner cartridge, turn off the printer and pull out this toner cartridge. Look up into the printer where this toner went. Make sure that both the charge roller and the transfer roller are still seated in the printer properly.


  • The charge roller is a tan-colored or gray roller attached to the inside of your top lid. Remove the toner cartridge from your printer. Close the top lid halfway with the cartridge still out. You will see the charge roller come down as you lower the top lid. Make sure that the charge roller is installed correctly within the two black arms on each end and that the roller does spin freely.

  • The transfer roller is the black, spongy roller in the bottom of the printer, under the toner cartridge. Push lightly down on it at both ends to make sure it is seated properly in its housing. NOTE: Try not to touch the charge roller with your bare hands. It is susceptible to the oil and may cause a permanent fingerprint to remain on the roller surface.

  • When you have checked the charge roller and the transfer roller, look around inside the printer. See if you can find any rollers that look loose or broken inside. Also look for any loose shreds of paper. If you do find a loose or broken part, you printer will probably require service to fix the problem.

If the rollers look fine, go ahead and reinstall the toner cartridge. If the squeaking/grinding noise continues and none of the rollers looks out of place, try swapping out the toner cartridge. There is a small chance that the toner cartridge is causing the squeaking/grinding noise. If you have any extra toner cartridges in stock, try another toner cartridge and see if that clears up the noise. If you have another working printer of the same model, try swapping the toner cartridges. See if the problem follows the toner cartridge or stays with the printer.
If replacing the cartridge does not cause the noises to go away, there are a few other things you can do to help pinpoint the source of the noise.


If the noise continues on the main printer, try opening the rear exit door while printing. See if you can tell if the grinding noise might be coming from one of those rear exit rollers/gears. If it does sound like it is coming from the rear of the printer, again look for any loose or broken part or any small pieces of paper.


If you have added any additional feed options (like a tray 2 or 3 option, duplex option, or envelope feeder), please remove these options. Try printing a few prints without these feed options attached. This will eliminate one of the feed options as the cause. If the noise goes away when you remove the options, reattach them one at a time. If the noise returns on one specific option, a roller or gear on that option may be the cause of the noise.


Is your printer making a rhythmic THUMP - THUMP - THUMP - THUMP noise when printing? This noise is a side-effect of a feature called Envelope Enhance. The Envelope Enhance feature is built into the fuser unit of the printer to help keep envelopes from wrinkling. This sound is perfectly safe and normal if the printer is printing on envelopes.

If none of the above fixes eliminates the noise, the printer will probably need service to return it to working condition.


***If you need any technical help on printer then you can reach at here

Feb 15, 2013 | Canon imagePROGRAF iPF8000S 44"...

Tip

Troubleshooting common laserjet printers problems


In order to understand and troubleshoot a Laserjet printer, I think it is important to understand how the printer functions. Laser printers for the most part contain some standard assemblies: Toner cartridge, Laser Scanning Assembly, High Voltage Power Supply, DC Power Supply, Paper Transport Assembly, Transfer Corona Assembly, Fusing Assembly, Printer Controller Circuitry, and Ozone Filter.
A laser printer undergoes a six step process that helps form images on paper. The six major steps are:

1. CLEANING- This is the first step in the process in which a rubber blade inside the printer cartridge scrapes any toner left on the drum into a used toner receptacle inside the cartridge. A fluorescent lamp discharges any remaining charge on the photosensitive drum (the photosensitive drum or EP drum loses its charge when exposed to light).

2. CHARGING- A special wire called the charging corona within the toner cartridge located above the photosensitive drum receives a high voltage from the High Voltage Power Supply. This high voltage is used to apply a strong , uniform negative charge to the surface of the drum.

3. WRITING- The laser is turned on and scans the drum from side to side, flashing on and off according to the bits of information the printer controller sends as it communicates the individual bits of the image. Where ever the laser touches, the photosensitive drum's charge is reduced to a slight negative charge. As the drum rotates, a pattern of the exposed areas is formed, representing the images to be printed.

4. DEVELOPING- Now the surface of the drum holds and electrical representation of the image being printed. Toner can now be transferred to the areas that were exposed in the writing step. A metallic roller called the developing roller inside the cartridge now acquires a charge from the HVPS. The toner sticks to this roller because there is a magnet located inside the roller and because of the electrostatic charges between the toner and the developing roller. The developing roller rotates toward the EP drum, the toner comes between the the developing roller and EP drum and is attracted to the areas that have been exposed by the laser and the toner is repelled by the areas that were not exposed to the laser. The EP drum continues to rotate until the developed image is ready to be transferred to paper.

5. TRANSFERRING- The developed image into position. The controller notifies the registration rollers that the paper should be fed through. The rollers move the paper underneath the EP drum, and the transfer process can begin. The controller sends a signal to the corona wire or corona roller (depending on which the printer has) and tells it to turn on. The corona wire/roller then acquires a strong positive charge from the HVPS and applies it to the paper. Now that the paper is charged, it pulls the toner from the EP drum and the line of contact between the roller and the paper. Once the rollers move the paper past the corona wire, the static-eliminator strip removes all charge from that line of paper.

6. FUSING- This is the final step in the process where the toner image is made permanent. The roller push the paper toward the fuser rollers. The fuser rollers grab the paper and is now in control of the paper. As the paper passes through the fuser, the 180 degree fuser roller melts the resin of the toner, and the rubberized pressure roller presses it permanently into the paper. The paper continues on through the fuser and then exits the printer.

The following picture will give you a general idea of the process and components.

6e8ecec.gif


TROUBLESHOOTING:

PAPER JAMS- These are by far the most common problem encountered by all printers at one point or another. Some common causes of paper jams are as follows:

1. The paper is wrinkled or has upturned edges, the wrong type of paper is used, the paper is not place properly in the feed tray (usually not even).

2. If paper jams start happening at a frequent rate then the problem could be a worn roller (which can be replaced and are not that expensive). The following pictures shows the rollers.

9016659.jpg

6a2eae9.jpg

3. Anther cause could be related to the drive gear of the pickup roller, shown here:
381b1a8.jpg


BLANK PAGES:

If your printer is printing nothing but blank pages, then the toner is not being put on the paper. There are three major causes for this happening.

1. The toner cartridge could be empty or if you have just bought a new cartridge it is possible that you purchased a defective one. If you forget to remove the sealing tape the toner will not be able to be accessed properly by the printer.

2. The Corona Assembly could have a malfunction such as a missing or damaged corona wire. If this is the case the developed image will not transfer from the EP drum to the paper. The following is a picture of Corona Assembly:
423433f.gif

3. Another cause is the High Voltage Power Supply. If the power supply does not charge the components with the proper voltages. Picture of an HVPS:
451fd29.jpg

REPETITIVE SMALL MARKS OR DEFECTS:

This usually happens with heavily used or older laser printers. The following could be causing the problem.

1. Toner may have been spilled inside the printer.

2. A chip or crack in the EP drum can be another cause which can cause a toner build up and can get stuck on one of the rollers. EP drum picture:
f036288.jpg

VERTICAL BLACK LINES ON THE PAGE:

This can be caused by the following:

1. A groove or scratch in the EP drum.

2. A dirty Corona Wire which prevents a sufficient charge from being placed on the EP drum.

VERTICAL WHITE LINES ON THE PAGE:

The number one cause is the following:

1. This usually happens when proper cleaning and maintenance is not performed on the printer. Foreign matter gets caught on the transfer Corona Wire.

IMAGE SMUDGING:

This happens when you pick up a paper that has just come out of the printer and when you touch the ink, it smudges or smears.

1. The fuser could be malfunctioning or need replacement due to a burnt out halogen light inside the heating roller.
87c0647.jpg

2. Dents or cold spots in the fuser heat roller can also cause the problem.

GHOSTING:

Ghosting is what you have when you can see light images of previously printed pages on the current page. Usually one of two things cause this problem.

1. Bad erasure lamps. This causes the previous electrostatic discharges to not be completely wiped away.

2. A broken cleaning blade. This causes old toner to build up on the EP drum and presents itself in the next printed image.

PRINTER PRINTS PAGES OF GARBAGE:

This happens when the print on the paper comes out like garbage and is not understandable or looks like some government secret code on the page. The following are usually the causes.

1. The printer driver software is not the proper driver for the printer or it is not configured for the correct page-description language (PCL or PostScript).

2. A bad formatter board. Remember the formatter board receives information from the computer and turns it into commands for the various components in the printer.

44a98cc.jpg


The following are some extra pictures to gain a better idea of some of the terminology used in this tip and get a better view of its components.
8c70d6a.jpg


Close up of Laser Assembly and mirrors:
96cb825.jpg


Laser diagram on how the process works:
84c37fe.gif

Fuser Gear:
c0f407d.jpg

Separation pad where pickup roller attached:
de7421c.jpg

Common Fuser Parts:
e7902b2.jpg

HP LASERJET ERROR MESSAGES:

00 Ready--The printer is in standby mode and ready to print.
02 Warming Up--The fuser is being warmed up before the 00 ready state.
05 Self Test--Full self test has been initiated from front panel.
11 Paper Out--The paper tray sensor is reporting no paper in tray.
13 Paper Jam--A piece of paper is caught in the paper path. Open the cover and remove any jammed paper and close the cover.
14 No EP Cart--No EP cartridge (toner cartridge) installed in the printer.
15 Engine Test--An engine self test is in progress.
16 Toner Low--The toner cartridge is low. Replace the toner soon.
50 Service--A fuser error has occurred. Commonly caused by a fuser lamp failure.
51 Error--Laser scanning assembly problem.
52 Error--Scanner motor in laser has malfunctioned.
55 Error--Communication problem between formatter and DC controller.

on Mar 16, 2010 | Office Equipment & Supplies

1 Answer

Lexmark T642 print gray though new cartridge


Hello,

The main cause of light print is a bad set of charge and transfer rollers. These rollers are used to put a charge on the paper and transfer the toner to the charged paper. When the rollers get worn out they can not put the proper electrical charge on the paper so the toner does not stick to it as it should. One roller sits under the toner cartridge and on is on top on the cartridge. If you pull out the toner and look inside the printer you will see the transfer roller and if you start to close the lid with the toner out you will see the charge roller come into view. Here are pictures of each one. Transfer roller first.

2_18_2013_9_41_31_pm.jpg

2_18_2013_9_41_48_pm.jpg

These rollers come in the preventative maintenance roller kit. This kit is available at the following link. The kit also comes with the pickup rollers.

http://www.ccl-la.com/catalog/product_info.php?products_id=301

Jan 25, 2013 | Lexmark T642 Laser Printer

1 Answer

I have a Kyocera Ecosys FS-1118MFP. When I try to make a copy the page comes out totally black. I have tried to change the toner, but its still the same. Tried adjusting the exposure aswell but invain. Any...


This is an uncommon issue and could be one of several things
  • The formatter could be sending garbage print data to the ECU (rare)
  • The ECU is bad, this controls the laser
  • The high voltage power supply could be bad
  • The the primary charge roller is bad.


Typical laser jet process.
  1. Primary charge roller is charged to -600V and transfers this to the photosensitive drum in the toner cartridge.
  2. Th laser removes the negative charge and places a +600V charge where the image/text will go
  3. Toner is attracted to the positive charged areas on the photosensitive drum (toner is negatively charged)
  4. Transfer roller has a + charge sits under the paper, this roller attracts the toner from the photo roller to the paper
  5. The fuser melts the toner onto the paper

So if the laser is going crazy and removes all the negative charge or no negativ charge is being applied to the photosensitve drum then toner will stick everywhere to it and you get a black page.


How this helps.

Jul 13, 2012 | Kyocera FS-1118MFP Laser Printer

1 Answer

Lexmark T644 left side of prints faded. New toner cartridge, transfer roller, Charge roller, left&right transfer roll arm, HVPS & laser unit. Same problem Please help


pull the toner cartridge out leave the bottom front cover open and bring down the top cover. with a flashlight check to make sure the charge roller is comming down straight if it comes down even. check to make sure the transfer roller has spring tension on the left side if the pring tension is present you will need to clean the flat leading edges of the mirror motor drive inside of the scanner located under the top cover.

Nov 04, 2009 | Lexmark T644 Laser Printer

1 Answer

Problem with ink coming out on paper


Replace the toner cartridge with a brand new one. There's no such thing as refilling toner cartridges. When it's empty, the drum unit is finished and it should be replaced, not refilled. Remember that the drum unit is sensitive to light, and will also be damaged if exposed to a great amount of light over a perid.

If a new cartridge does not solve your problem, remove the cartridge and check out the charge roller. It's located in the upper part of the "cartridge-room". It's a grey roller. lower the front cover the get easy access to it.

If it looks nice and clean, just leave it. If it is dirty and smutsy, you should remove it and try to clean it with hot water. If it is damaged in any way, it should be replaced.

Still problems ?

Check out the fixing unit. Remove the fixing unit and look at the the big rollers that put out the paper. If they look nice, put the fixing unit back in. If they are burned and dirty, replace the fixing unit.

Good Luck.

Jul 29, 2009 | Lexmark T632 Laser Printer

1 Answer

Print job is totally black


I know you've tried some of the below suggtions but I put the whole list there for everyone else. If this printer is less than a year old call them. Their tech support has changed a lot! They try to take care of you.

Possible causes:

· Check/Replace the toner cartridge
· Check the charge roll assembly (see Note below)
· Check the Toner Darkness, Brightness, and Contrast settings
· Try cleaning the inside of the printer
· Bright light/sunlight entering the printer (on right side of printer)
· Printing on media other than plain paper (make sure you're using laser paper- it makes a difference!)
· Using a refilled cartridge. Lexmark will emphatically tell you they are not supported.


NOTE: Checking the charge roller:
1 Power off the printer and remove the toner cartridge.
2 Look into the upper area of the printer where the cartridge was sitting. Located near the top of the printer you will see a couple of gray rollers. This is the charge roller assembly. See the area highlighted in the image below.

NOTE: If you cannot see the rollers, close the upper lid slightly and the rollers should lower into view.


For larger version of this image, click here.

3 Make sure the roller assembly is seated correctly into the holders on the left and right-hand sides. If not, try to reseat the assembly into the holder arm.

IMPORTANT! If the charge roller assembly is not present, it needs to be installed. Look around the inside of the printer and near the printer for the roller assembly. If the charge roller assembly is missing, you will need to order a replacement set in order to get the printer operational again. See the 'Additional Assistance' section at the end of this document for more information.

4 If the rollers are present and installed correctly, check their condition. If the roller surface appears dirty, take a clean dry cloth and carefully clean off any dust or toner. Do your best to ensure all of the roller surface is clean. NOTE: If any part of the rollers is damaged, the charge roll assembly will need to be replaced.

CAUTION! Try not to touch the rollers with your bare hands. The surface is susceptible to contamination and a permanent mark could remain on the rollers.

5 If you were able to reseat the charge roller assembly or managed to clean the rollers, power on the printer and try printing again. Print 10 to 20 pages to give the pages a chance to clear up. If the pages do not begin to clear, the printer will likely require service to correct the issue.

For more information on arranging repair service, please contact Lexmark Technical Support or an authorized service center. See the 'Additional Assistance' section at the end of this document for details.

Jun 17, 2009 | Lexmark T644 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:
http://www.fastprinters.com/TechSupport_repair_parts.asp#T640VIDEO

Mar 24, 2009 | Lexmark T640 Laser Printer

2 Answers

I have smudges that appear horizontially in a repeating patter


Hi fpugliese630:

1. Remove the paper tray and look inside the printer on the upper part and you see two rubber feed rollers, (they should be a white color) if they have toner on them that could be one of you problems,you would have to clean or replace them if they are worn.

2. you can run whats called a half test, print any document and while the document is printing open the front cover when you think that the paper is under the toner cartridge so the printer will stop. look at the printed page to see if the mark is there. If the mark is not there than you have a problem with the fuser assemble.

Note*
Make sure that the paper path is clean.

Jan 08, 2009 | Lexmark T632 Laser Printer

3 Answers

Add Toner


Your machine has got a toner pump on each of the colours wich transport the toner through pipes , these pipes get blocked and needs to be vacuumed out to clear the blockage .i got the service manuals if you need any further assistance

Nov 13, 2007 | Ricoh Aficio AP3800C Laser Printer

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