Question about Lexmark T630 Laser Printer

2 Answers

Blank page on a t632

HI,
I have no image on the paper. I have changed the lv power, hi voltage, head and control board. I swapped the rollers and cartridge with another printer and they work over there. I checked the continuity on the charge roller wire and all voltages. Still I get a hot white piece of papaer and no image or error messages. The Lexmark level 2 guy is stumped also.
Lance

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  • Anthony Schenck
    Anthony Schenck May 11, 2010

    If you print the paper menuis there print on the page then? If set up as a workstation printer it will not even print a Windows test page?

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2 Answers

Thanks. 2 printheads replaced (made in China) check continuity on the hv ps leads and physically swapped rollers and cartridge with a workibng unit. It sure lookd like a print head but 2 out of box failures in a row?

Posted on Feb 16, 2008

Change the print head

Posted on Feb 15, 2008

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I have an HP 4345 MFP that's printing nothing but blank pages when copying, sending a print job to the printer. Im not even able to print the config page. All comes out blank. Does anyone have any idea...


if you are tec guy?
do half test page test find any image created on catridge drum, if no image found then
Check laser scanner assembly shutter fully operating or not while catride access unit closed, if unable to check, remove the shutter from laser scanner assm
Increase toner density
set factory settings,
If image on drum no print on paper, check transfer roller, contacts, if dirty replace T.roller, no result replace Power supply board..

Sep 09, 2011 | HP LaserJet 4345mfp Printer

Tip

Understanding how laser printer works


Printing technology on organic photoconductor drum (OPC Drum) is summarized by the following 6 steps:http://i.fixya.netmabroukmedal_18.jpg
STEP1:The OPC drum must be charged with a negative charge, (electrons)
the primery charge roller apply a hight voltage to the drum.Note:if this step missing, (poor contact in the high voltage) the page will be printed all black) the charge roller is located on the drum.
http://i.fixya.netmabroukmedal_19.jpg


STEP2: The laser beam reach the drum surface to discharge the zone of text that will be printed on the paper. Note: if the laser beam don't reach the drum,( the interlock switch is not actuated when the front cover is closed) the image will not be formed on the drum. the laser unit is showing on this picture:

http://i.fixya.netmabroukmedal_20.jpg


STEP3:the developping cylinder prepare the toner to be taken by the drum, the surface that was touched by the laser beam are positive, they attract the toner by electrostatic force, the other zone push the toner because they have the same charge (both negative, coulomb law). the image will be formed on the drum surface.the developping roller is located on the cartridge.


STEP4:the transfer roller attract the image formed on the drum surface to the paper.Note: if the high voltage not reach the transfer roller, the paper comes out blank (poor contact), or if the transfert roller is dirty the quality of printing is bad. these is the picture of the transfert roller and the paper pickup roller :

http://i.fixya.netmabroukmedal_21.jpg


http://i.fixya.netmabroukmedal_23.jpg


STEP5:the image was transfered to the paper, and must be fixed by temperature, and pressure. the fixing unit or fusing unit is composed of :the hot roller and a pressure roller.
http://i.fixya.netmabroukmedal_26.jpg


http://i.fixya.netmabroukmedal_25.jpg
http://i.fixya.netmabroukmedal_27.jpg

STEP 6: the clean blade or cleaning roller remove the residuel toner on the drum surface, to prepare for a new print operation. Note :if the cleaning step was not performed the page comes out with the trace of the last print page.

on Dec 07, 2010 | Epson EPL 5900L Laser Printer

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 | Printers & Copiers

1 Answer

After installing maint. kit and new toner cart.still have the left half of pages are blank,right half faded


Hi, try the following. Send a print job of a few pages and when the first page comes out then open the front cover of the printer like if you were going to remove the toner. Remove the toner and look at the Photoconductor. If the image in the photoconductor is complete, no half of the print image and no blurring on the other half then the problem is your Transfer roller. Could be that is not installed properly or needs replacement it could also be that the High Voltage power supply (HVPS) is not sending enough charge to the transfer. If the image of the photoconductor is appearing just like the one printed on paper then the problem could be the charge roller or the HVPS.

Jan 18, 2010 | Lexmark T642 Laser Printer

2 Answers

I get blank pages when printing. Sometimes all pages are blank, sometimes first and last page print, with blank middle pages.


hi,check your printing setting and then print.
or....
uninstall the printer then install the printer again then printer has default setting and print the paper.
sometimes printer current pages print wich is selected by setting.you must select all the pages.
to change the setting,,,
1-open control panel then open printers and faxes then check seeting.

Apr 12, 2009 | HP DeskJet 842c InkJet Printer

2 Answers

T632 lexmark getting dirt on printed pages


Hi Krimlakh,
Try replacing the toner cartridge first. Usually when this happens the waste hopper of the toner cartridge is full and start to leak on to the page.
Rgds
S88

Dec 18, 2008 | Lexmark T632 Laser Printer

1 Answer

I have a Lexmark T632 that is used very often. Constantly printing over 1000 pages daily and I always get the error message Print head Error 934 - Lost Lock condition but once I shut down the printer and...


These error codes indicate a problem with the mirror motor circuit in
the printhead assembly or the mirror motor cable to the system board
cable or system board assembly. Check the continuity of the mirror
motor cable connected to J5 on the system board. If incorrect,
replace the cable. The voltage at J5-7 measures approximately
+24 V dc. If incorrect, replace the system board. If correct, replace
the FRUs in the following order:
• System board
• Printhead assembly

Dec 10, 2008 | Lexmark T632 Laser Printer

3 Answers

Hp 4l will not print


just a silly question I take it you have removed the tape from the toner cartridge. Well do have to make sure of these things. It is possible that the transfer roller has come out of position to check it should be a black roller that sits under the toner cartridge when install. The roller is in the machine at all times. The other thing are you using HP originals cartridges as this could be a factor.

Hope this is some sort of help
please rate me
Cheers
J

Dec 31, 2007 | HP LaserJet 4L Printer

1 Answer

Black line down the page


Is the line on the front of the page or on the back? If on the back, you need to clean the platten which is the piece of plastic under the paper.

If its on the front, and you say "It lools like a rubber cover may be missing off of one of the rollers", could you upload a picture of this roller? I don't recall any covers on rollers in Canon printers.

Try this, print out a blank page. If line is still there, print out 10 blank pages. If line is still there and has not faded, this is unusual and may need servicing. There may be a problem with the encoder strip (it's a clear plastic strip with black lines running the length of the printer slightly behind the head), Try cleaning it on both sides with a little windex on a q-tip. It's delicate so be careful.

If the line looks faded after printing 10 blank pages, some ink has dripped onto something that is contacting the paper. This could be a roller, the bottom of the head carriage or even a hair or piece if dust that is stuck in the machine or on the bottom of the head. In this case, I would recommend cleaning everything. Revove the head (tell the machine you're going to replace ink, and when it moves the head into the centre position unplug the power cord.

Remove the head and clean off any dust or hairs on the bottom. Run a Q-Tip along the bottom of the carriage assembly wherever you can. Clean any accessable rollers. If you can get at it, clean the wiper on the purge unit (the unit the head sits over when it is parked), as well as the seals.

Reinstall the head and ink, close the lid, power up and retry printing.

I hope this helps. If not, there could actually be a fault with the printhead or one of the circuit boards

Dec 28, 2007 | Canon PIXMA iP4200 InkJet Photo Printer

2 Answers

Ricoh Aficio cl2000


Most of the time when I find this happening on a printer, not just Ricoh's it turns out to be the PCU (photo conductor unit). The color PCU is one unit and the black is a seperate unit. Hope this helps.

Dec 17, 2007 | Ricoh Aficio CL2000 Laser Printer

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