Question about Lexmark C782dn Laser Printer

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STREAK ON ITU OF LEXMARK C782

One line about a half inch in diameter running the length of the itu. shows up in the same spot. removed the toner cartridges and ran a belt tracking test to clean the line off the itu but after a cleaning the line becomes more vivid and the display reads "belt tracking test failed, error code: 04" the colour of the line depends on the colour of the job being printed but when i did the belt tracking test the line looks the same colour as waste toner. PLEASE HELP

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The only thing that helps is replacing the ITU.

Posted on Jul 27, 2010

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100.01 Services ITU Error, Lexmark C782


From the Lemark Service manual

A 100.01 ITU error indicates that the printer did not detect the ITU belt home sensor. Before proceeding with this

service check, make sure that the Second Transfer Roll is correctly installed. After you reinstall the Second

Transfer Roll, check to see if a 100.01 ITU error is still displayed. If a 100.01 ITU error is still being displayed,

continue with this check.

The ITU has an optical sensor that watches for a piece of reflective tape on the inside of the image belt. This

tape is read every revolution of the belt. If a signal is not received from the belt sensor within a certain time

period, the printer posts an error due to the loss of signal. There are several causes for the loss of signal. First,

the belt has tracked too far to the front or rear of the printer. In this case, the belt is still turning, but the reflective

tape is no longer passing within view of the belt sensor. This is considered a belt tracking error and is initially

posted as a 100.02 ITU Error. The other causes of a signal loss could be a belt stall, meaning the belt is not

turning, or a true signal loss, which would be due to a bad sensor, broken cable, loose connection, or bad

system board. These other causes post as a 100.01 ITU Error.

To assist the printer in determining the cause of a signal loss, there is a buffer that records the belt position for

the last 50 revolutions. If the printer loses the belt signal, it refers to the buffer. If the buffer shows significant

mistracking before signal loss, it will post a 100.02 ITU Error. If the buffer shows that the belt has been tracking

in the center before signal loss, it posts a 100.01 ITU Error. Due to memory restrictions, the buffer is not saved

during POR. This means if a printer posts a 100.02 ITU Error, so the belt is tracked off, and the customer or

servicer turns off the printer to clear the error, when the printer starts up, it will still not see the belt signal and will

now post a 100.01 ITU Error because the buffer is empty. When servicing a printer for a 100.01 ITU Error, it is

important to view the error log. See "Display Log" on page 3-29. The error log can only be displayed at this
point. Do not try to print the log. Look for past occurrences of 100.01 ITU Errors preceded by a 100.02 ITU Error.

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30 ITU MISSING


ITU is missing or defective. Try reinstalling the ITU. If this doesn't work you'll have to replace it. The ITU is the black "belt" at the bottom of the printer.

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1 Answer

My lexmark c782 keeps coming up 100.01 ITU error. Please help.


That usually means that the intermediate transfer unit(ITU) is defective but try these troubleshooting steps found in the Lexmark website. Just go to this link: http://bit.ly/dzs6o1. Follow the instructions but if all else fails, I suggest you contact Lexmark Technical Support.

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1 Answer

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ITU is missing or defective. Replace the ITU and the problem should be solved.
Gerrit Jan

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2 Answers

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Have you recently replaced the ITU? If it is saying ITU Maintenance, then the kit needs to be replaced. If you have already purchased and installed a kit, the reason this error is coming up is because the second transfer roll (small roller under the ITU) is not installed properly. Otherwise, you should purchase and install a new ITU maintenance kit.

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BLACK VERTICAL STREAKS


toner recently replaced?
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try running a cleaning cycle.
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You replace the ITU it has reached its end of life cycle.

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