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CANON LBP 2900 Laser Printer not working fixed

By on July 28, 2015
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I have received CANON LBP 2900 Laser Printer for repair. The complaint was when switching “ON” the printer power light was glowing but it does not pick up the paper for printing. Further discussion with the customer I came to know that he was an engineering student and he has opened the printer for cleaning purpose and after cleaning from inside this symptom occurred.

Most of the time I do not repair in front of the customer. This is because if the equipment is new, I had to learn and may struggle how to open it and this may not be good if the customer sees it.  For your information not all equipment can be easily opened.

I turned On the printer and it does not initialize. I had checked the toner cartridge and top cover for proper fitting. These two sections have sensors and if it not fitted properly, the printer will not start for safety purpose. I have also checked the gear system, solenoid coil, the power and the controller PCB and all seems to be good.

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When I continued to further check the printer, I found the paper out sensor clip came off. See the photos below:

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Once it was fitted back to its original location and powered On, it can initialize and the printer came back to life.

yogesh panchal







This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.

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Note: You can check out his previous repair article in the below link:






  1. Gary

    July 28, 2015 at 9:06 am

    Yes I also agree it can be very nerve wracking having customer watching and asking questions while you try and fix - always best to fix away from customer - they can be very distracting.

    • Robert Calk

      July 28, 2015 at 11:04 am

      No matter what type of job I was doing in my life, It never bothered me to have customers watching me. Though, other people get nervous when I'm watching them. Maybe it's because I am a Marine. lol

      • Humberto

        August 14, 2015 at 8:58 pm

        Wow! Robert, you are a Marine, I did not know that. Congratulations.

        • Robert Calk

          August 15, 2015 at 1:38 am

          I've been out of the USMC for a long time. But I was in the Marines and maybe that is why it doesn't bother me when people watch me work.

  2. Gopal Sharma

    July 28, 2015 at 10:02 am

    Thanks for sharing the printer repair article. I am also having the same printer model. It will be helpful in future.

  3. Robert Calk

    July 28, 2015 at 10:57 am

    Good job, Yogesh. Thanks for the good photos.

  4. Albert

    July 28, 2015 at 2:26 pm

    Thanks for sharing this printer repair. I take it you did clean the paper dust out of the insert you showed on the photos? It looked still a bit dirty. And with an air compressor and some clean air it could prevent new paper sensor problems? But of course that only helps when the origin the Printer was placed is kept clean.

  5. Humberto

    August 14, 2015 at 9:00 pm

    Good repair Yogesh, congratulations.


    September 24, 2016 at 11:31 pm

    Though the cartidge inside printer (canon 2900) it indicates ;INSERT CARTIDGE N TONER WHAT WILL BE THE FAULT

  7. ere

    November 8, 2016 at 1:45 pm

    thanks! God bless !

  8. Anurag

    November 14, 2016 at 3:58 pm

    it is very adding in my knowledge.superb..thank you..

  9. Mukesh Pandya

    September 11, 2017 at 2:03 pm

    I connect all Cabell properly & cable are good working but I print so computer massage display is please connect your printer what problem please help me

    • Mukesh Pandya

      September 11, 2017 at 2:04 pm

      My printer is canon 2900b

  10. Ranjith Ranasinghe

    December 23, 2017 at 12:48 pm

    Why printer indicate "No Toner Cartridge"


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