Showing results for 
Search instead for 
Did you mean: 

TR8520 Scanning partially black pages


Hello All,

      My TR8520 has started to partially scan the documents I place on the glass for printing or for scanning.  Seems like the scanner is moving all of the way across the documents possibly?  Sounds like it is working correctly, but it is scanning and printing documents that have 100% black sections at the bottom of the document (scanner not moving far enough to the right?).


I deleted driver from my Mac running on 10.14.6 and reinstalled but scanner/printer is doing same thing.


I tried alligning print head.  Printer produced allignment document, and when placed in Scanner bed and hitting ok I immediatlely get a 5100 Printer Error code requesting printer be turned off/on and checked again.  Probelm persists, so I am reaching out to Canon community for HELP!


Printer functions normally and prints full page(s) if I request print of document from files/internet, scanner/copier seems to be issue.


Appreciate your time,




Same problem here. Bottom half/third of page completely black when I scan.


Hi rdemarest and becannon.


Based on the error message and the outcome of the partial scanning, the scanning assembly or its connected components are bad, and the printer will need to be replaced.  If you're located within the U.S., you may register the printer and access support through


If you're located outside the U.S., you may find your local branch of Canon through the map at


Did this answer your question? Please click the Accept as Solution button so that others may find the answer as well.

06/30/2022: Service Notice: EOS 70D: Error 70 or Error 80
06/10/2022: Service Notice:UPDATE: Canon Inkjet Printer continuous reboot loop or powering down
06/07/2022: New firmware version 1.3.2 is available for PowerShot G7 X Mark III
06/07/2022: New firmware version 1.0.3 is available for EOS M50 Mark II
05/31/2022: Did someone SAY Badges?
05/26/2022: New firmware version is available for EOS-C500 Mark II
05/26/2022: New firmware version is available for EOS-C300 Mark III
05/10/2022: Keep your Canon gear in optimal condition with a Canon Maintenance Service
05/05/2022: We are excited to announce that we have refreshed the ranking scale within the community!
04/26/2022: New firmware version is available for EOS R5 C
03/23/2022: New firmware version is available for EOS-C70
03/22/2022: New firmware version 1.2.0 is available for PowerShot PICK
03/16/2022: New firmware version 1.5.2 is available for EOS-R5
03/16/2022: New firmware version 1.5.2 is available for EOS-R6
02/09/2022: Share Your Photos is back!
02/07/2022: New firmware version 1.1.1 is available for EOS-R3
02/07/2022: New firmware version 1.6.1 is available for EOS-1DX Mark III
01/13/2022: Community Update. We will be retiring the legacy profile avatars on 01/20/2022. Click this link to read more.
01/05/2022: Welcome to CES 2022!
12/7/2021: New firmware version 1.3.0 is available for Mount Adapter EF-EOS R 0.71x
12/7/2021: New firmware version 1.1.1 is available for CR-N 300
12/7/2021: New firmware version 1.1.1 is available for CR-N 500
12/2/2021: New firmware version 1.1.0 is available for RF 70-200 F4 L IS USM