Streaking the copier has started producing copies that are streaked vertically w/ bands of lightness alternating w/ bands of darkness. And that is w/ the manual setting at the lightest it will go: if I used the 'auto' setting for copy lightness, the copies would come out basically black.

Print Head Alignment For Canon printer For more details visit this website: https://www.errorsdoc.com/canon/

Open the printer driver setup window.
Click Custom Settings on the Maintenance tab.
The Custom Settings dialog box opens.
Switch head alignment to manual.
Check the Align heads manually check box.
Apply the settings.
Click OK and when the confirmation message appears, click OK.
Click Print Head Alignment on the Maintenance tab.
The Start Print Head Alignment dialog box opens.
Load paper in the machine.
Load three sheets of A4 size or Letter size plain paper into the rear tray.
Execute head alignment.
Make sure that the machine is on and click Align Print Head.
Follow the instruction in the message.
Check the printed pattern.
Enter the numbers of the patterns with the least amount of streaks in the associated boxes.
Even if the patterns with the least amount of streaks are clicked in the preview window, their numbers are automatically entered in the associated boxes.
When you have entered all the necessary values, click OK.
Note:
If it is difficult to pick the best pattern, pick the setting that produces the least noticeable vertical streaks.
(A) Least noticeable vertical streaks
(B) Most noticeable vertical streaks
If it is difficult to pick the best pattern, pick the setting that produces the least noticeable horizontal streaks.
(A) Least noticeable horizontal streaks
(B) Most noticeable horizontal streaks
Confirm the displayed message and click OK.
The second pattern is printed.
Check the printed pattern.
Enter the numbers of the patterns with the least amount of streaks in the associated boxes.
Even if the patterns with the least amount of streaks are clicked in the preview window, their numbers are automatically entered in the associated boxes.
When you have entered all the necessary values, click OK.
Note:
If it is difficult to pick the best pattern, pick the setting that produces the least noticeable vertical streaks.
(A) Least noticeable vertical streaks
(B) Most noticeable vertical streaks
Confirm the displayed message and click OK.
The third pattern is printed.
Check the printed pattern.
Enter the numbers of the patterns with the least noticeable horizontal stripes in the associated boxes.
Even if the patterns with the least noticeable horizontal stripes are clicked in the preview window, their numbers are automatically entered in the associated boxes.

Vertical Bands, Lines, or Streaks in Copies, Faxes, or Scans

support.hp.com/us-en/document/c02881567

Figure : Sample output with vertical colored bands or lines ... Remove any paper from the automatic document feeder (ADF) tray. ... To protect the scanner, do not spray the glass cleaner directly on the glass. .... determine if your printer is still under warranty, and then Contact HP Support to schedule a repair or replacement.

How to get rid of lines on a copied page - YouTube

? 2:10
https://www.youtube.com/watch?v=xTJpCg5sHl0
Feb 17, 2010 - Uploaded by Wayne Springer
When you make copies on your copy machine, does it ever leave a black vertical line ... QLS ' How to Eliminate Vertical Linesfrom Scans, Copies & Faxes ... Part 2- Fix or repair color laser printer with fading, light print, or lines ...

Not sure you can fix this, but most of the time the stripes are produced in a dark environment with one or a few bright lights. The streaks start on the bright light. Most of the time if you shoot the picture the streaks are not on the picture.
You could try to switch the camera to the automatic, or perhaps night scene.
If the streaks are there in normal light, I think your camera is defect.

Hello James,

Please click Vertical Bands Lines or Streaks in Copies Faxes or Scans to access the troubleshooting steps that should resolve the issue.

I suggest You Go to Official Canon Printer Page For You Canon Problem On Below Canon Page URL:
Copy Has Vertical Black Streaks In Case You Still face Problem and Need Online Assistance Then Please Follow Us For On : Canon Printer Support

Chang your UHR and LHR with stripper fingeres, if it is not available at your country change the fusr unit it will resolve your problem feel free to contact me if you have any difficulties and rate me

Hi,
I'm afraid that regarding pale copies, you are better off checking your consumables (toner, fusers, etc) and then try talking to Toshiba. However, the vertical white streaks can be caused by excess ink and other contaminants on the inside of the printer. If you open the main door to both the printer and finisher (if fitted) and look at all of the visible runners, feeders and other handling devices, try to see if any of them line up with your vertical streaks on a page. If so, try manually rolling them and cleaning them thoroughly. This might help remove some of the streaking (it did on mine).
Hope this helps, Alistair

You will need a new printhead. If its not under waranty good luck trying to find one.

There is something on your scanner glass. Clean the glass with glass cleaner. If this happens when using the automatic document feeder, open the top side cover where the paper feeds into. There is a narrow glass strip there. Clean that as well.

If this fails, the scanner head has a bad sector on the CCD and will need to be replaced. You will probably find that it will be cheaper to replace the printer entirely if that is the case.

I've refilled the toner cartridges a few times now and never had a problem with vertical streaks until recently. I refilled both the cyan and magenta and when I ran the test page I had dark vertical streaks on both sides. I fiddled around cleaning things, running cleaning paper through, changing reset resistors but to no avail so eventually decided to buy a replacement refurbished cyan cartridge since the streaks looked mainly blue and bingo... well almost now I just have very light magenta streaks. The issue is obvious when I compared the old and new cartridge, the replacement toner is a much duller cyan and is of the wrong consistency since once it's been in the printer everything gets covered in it which is why I think it causes the banding to occur. I'm just trying to work out now whether to try refilling the magenta again (v. messy) or just go for another refurbished cartridge (£34).