You hit print on your Canon PIXMA TR8620a expecting a crisp document, and instead the page comes out faded, streaky, or with colors that look nothing like what is on your screen. Whether you are seeing thin white gaps running through text, washed-out photos, or smudges along the edges, bad print quality on this all-in-one almost always traces back to a short list of fixable causes. The good news is that you can work through nearly every one of them from the printer's 4.3-inch touchscreen, no service visit required.
The fixes below are ordered from the quickest and safest to the most involved. Start at the top, test after each step, and only move down the list if the problem persists. Most owners solve faded or streaky output within the first few maintenance routines.
Start With Your Paper and Print Quality Settings
Before you blame the hardware, check the easiest culprit first. Canon's initial recommendation for blurry, faint, streaky, or inaccurate-color printouts is to confirm that your media type and print quality settings actually match the paper you loaded.
If you selected a glossy or photo media type but loaded plain paper (or the other way around), the printer lays down the wrong amount of ink and the result looks off. Make sure the print settings in your application or driver match the real paper, and that the printer's registered paper settings agree with what is sitting in the cassette or rear tray.
Loading direction matters too. In the cassette, the printable side faces DOWN; in the rear tray, the printable side faces UP. Printing on the wrong side of coated paper produces dull, blotchy results that look like a quality fault but are not.
Confirm Ink Levels and Swap Any Low Tank
Low or empty ink is the most common reason for faded, missing, or wrong colors. The TR8620a uses a 5-individual-ink system, so a single drained tank can wreck one color channel while the rest look fine.
To check your levels on the printer, go to the HOME screen, tap Hint, then Estimated ink levels on the touch screen. You can also look at the ink lamps inside the printer. Replace any tank that has run low or out.
This model takes the PGI-280 pigment black tank plus CLI-281 black, cyan, magenta, and yellow tanks. When you install a new tank, confirm you fully removed the protective plastic wrap and any orange tape, since leftover tape blocks ink flow. Replace any low tank before you attempt the print head alignment further down this list, because low ink can affect the alignment result.
Print a Nozzle Check Pattern to Diagnose the Head
The nozzle check is your diagnostic test. It tells you whether the print head nozzles are clogged, which is what causes white streaks and missing lines.
- 1.Load A4 or Letter plain paper in the cassette.
- 2.Select (Setup) on the HOME screen.
- 3.Choose Maintenance, then Nozzle Check, then Yes.
When the pattern prints, examine it carefully. In pattern C, look for missing lines; in pattern D, look for horizontal white streaks. If both areas are clean, select "All A" and you are done; the printer returns to the Maintenance menu. If lines are missing, streaks are present, or a color or pattern fails to print at all, select "Also B" and then Yes to start print head cleaning.
Run a Print Head Cleaning
If the nozzle check revealed missing lines or white streaks, a standard cleaning clears the clog by pushing ink through the nozzles.
- 1.Select (Setup) on the HOME screen.
- 2.Choose Maintenance, then Cleaning, then Yes.
The cleaning takes about 1 minute. Do not perform other operations while it runs. When it finishes, select Yes to print another nozzle check pattern so you can compare the before and after.
Because cleaning consumes ink, only run it when the nozzle check is genuinely unsatisfactory. Repeatedly cleaning a head that is already clear just wastes ink.
Escalate to Deep Cleaning for Stubborn Clogs
When two regular Cleaning attempts have not resolved the print head problem, Canon recommends moving to Deep Cleaning, which is a stronger version of the same process.
- 1.Select (Setup) on the HOME screen.
- 2.Choose Maintenance, then Deep Cleaning, then Yes.
Deep Cleaning takes about 1 to 2 minutes and uses more ink than a regular cleaning, so reserve it for when standard cleanings have already failed. Print a nozzle check afterward to confirm the result.
If there is still no improvement, turn the printer off and let it rest for a while before trying again, then run Deep Cleaning once more. Letting the printer sit sometimes loosens dried ink that cleaning alone cannot.
Align the Print Head for Crooked or Uneven Output
If your nozzles are clear but ruled lines look misaligned, or the print is otherwise uneven, the print head likely needs alignment.
- 1.Load A4 or Letter plain paper in the cassette.
- 2.Select (Setup) on the HOME screen.
- 3.Choose Maintenance, then Print Head Alignment - Auto, then Yes.
- 4.When the printer prints the alignment sheet, place it on the platen glass printed-side DOWN as marked, then close the cover.
- 5.Select OK so the printer scans the sheet and adjusts the head automatically.
Do not touch the printed areas of the alignment sheet, since fingerprints can throw off the scan.
Stop Smudges, Scratches, and Ink on the Back of Pages
Smearing and scuff marks are a different problem from clogs, so they need a different fix. For smudged or scratched output, start by using paper suitable for the print job and flattening any curled paper before loading it.
Next, turn on the abrasion-prevention setting, which widens the gap between the head and the paper. Go to HOME, then Setup, then Device settings, then Print settings, then set Prevent paper abrasion to ON. On plain paper, lowering the print intensity also helps when the paper is absorbing too much ink and going wavy.
If ink shows up on the back of your pages, which is common after 2-sided printing, run Bottom Plate Cleaning to clean inside the printer. Clean the paper feed roller only if paper is not feeding properly, and use that sparingly since it abrades the roller. For the exact in-menu steps of Bottom Plate Cleaning, paper feed roller cleaning, and adjusting the Ink Drying Wait Time, refer to Canon's official Maintenance pages. Increasing the Ink Drying Wait Time gives wet ink more time to set and further reduces smudging.
Update or Reinstall the Driver and Firmware
If quality problems show up only when you print from a computer (and copies made directly on the printer look fine), the issue may be software rather than the hardware.
Get the latest driver and software for the TR8620a from Canon's official Drivers and Downloads page for your specific Windows or macOS version, and update the printer firmware while you are there. Driver and firmware versions change over time, so rely on the official download page rather than an old installer.
On Windows, the Canon IJ Printer Assistant Tool gives you another way to run a nozzle check, cleaning, deep cleaning, and alignment from the computer instead of the operation panel.
Reset Settings, Reseat the Head, or Contact Canon
This is your last resort, so only reach it after the cleaning, deep cleaning, and alignment steps above have failed. If repeated deep cleanings still do not produce a good nozzle check, Canon notes the print head may be damaged.
You can restore the printer's configuration through the reset menu. Select (Setup) on the HOME screen, then Device settings, then Reset settings, then choose one of the available options. "LAN settings only" resets your network configuration so you can redo Wi-Fi setup, while "Reset all" returns every setting to default. The menu also offers "Settings only", "Web service setup only", "Telephone number only", and "Fax settings only". Be aware that "Reset all" wipes all your customizations and returns every setting to its factory default, so you will need to run through printer setup again afterward.
If print quality is still bad after cleaning, deep cleaning, and reseating the print head, Canon directs you to contact your nearest Canon service center to request a repair.
Frequently Asked Questions
How many times should I clean the print head before it makes a difference?
Run a standard Cleaning, then a nozzle check, and if needed a second Cleaning. If two regular Cleanings do not resolve the problem, move to Deep Cleaning. Each cleaning uses ink, so always verify with a nozzle check rather than cleaning repeatedly on a hunch.
My alignment sheet printed faintly. Why?
Low ink can affect how the print head alignment sheet prints and scans. Check your estimated ink levels by going to HOME, then Hint, then Estimated ink levels, and replace any low tank before running Print Head Alignment - Auto.
Why is ink appearing on the back of my pages?
This is common after 2-sided printing and usually means ink has built up inside the printer. Run Bottom Plate Cleaning to clean the interior, and consider increasing the Ink Drying Wait Time so the ink has more time to set. Refer to Canon's official Maintenance pages for the exact in-menu steps.
Do I need to replace all the ink tanks at once?
No. The TR8620a uses a 5-individual-ink system with separate PGI-280 pigment black and CLI-281 black, cyan, magenta, and yellow tanks, so you only replace the specific tank that has run low or empty.
What should I do if nothing fixes the print quality?
If repeated deep cleanings still produce a poor nozzle check, the print head may be damaged. After trying cleaning, deep cleaning, and reseating the head, contact your nearest Canon service center to request a repair.
