You set a document on your Canon PIXMA TR8620a, press Scan, and nothing happens; the printer can't find your computer, the scanning software hangs, or the page never lands where you expect it. Because this all-in-one carries both a flatbed glass and an Auto Document Feeder, a scan failure can stem from the cable, the Wi-Fi band, the driver, or a permission your operating system quietly added. The good news is that most of these stalls clear with a handful of ordered checks. Work through the fixes below from the top, since the early ones are the quickest and least disruptive, and save the reset for the end.
Start With a Clean Power Cycle
Canon's own scanner guidance opens with the simplest instruction, which is to make sure your scanner or printer is turned on. Before you dig into software, confirm the TR8620a is powered up and showing a ready state on its operation panel.
Then turn it off and back on. A power cycle clears transient states that can leave the scanner unresponsive, and it costs you nothing to try first.
- 1.Confirm the printer is on and idle (not mid-job or showing an error).
- 2.Turn the printer off.
- 3.Turn it back on and wait for it to return to the ready screen, then retry your scan.
Rule Out the USB Cable and Hub
If you scan over a USB connection, the cable path is a common culprit. Canon's "Scanner Does Not Work" checks call for connecting the USB cable to a different USB port on the computer.
A USB hub can also interrupt the connection. If your cable runs through a hub, remove it from the hub and plug it directly into a USB port on the computer, then try scanning again.
Confirm Both Devices Share the 2.4 GHz Network
For a wireless setup, check the connection status and reconnect as needed so the printer is actually on the network. This step trips up more people than any other, because of one spec detail.
The TR8620a uses Wi-Fi (Wireless LAN, 2.4 GHz, IEEE 802.11b/g/n); it is 2.4 GHz only, with no 5 GHz band. That means the printer cannot join a 5 GHz-only SSID, so confirm both the printer and the computer can reach the same 2.4 GHz network. If your router broadcasts separate 2.4 GHz and 5 GHz names, make sure the printer is on the 2.4 GHz one.
Restart the Computer to Reload the Scanner Software
Canon lists "Restart the computer" as a check when the scanner does not work, and it is worth doing before you reinstall anything. A restart clears stuck scanner processes and reloads the driver and utility from scratch.
After the machine comes back up, open your scanning app fresh and attempt the scan again. If it now works, a hung background process was the cause.
Reinstall or Update the Driver and Scan Utility
If ScanGear or scanning still won't start, the driver may be missing or damaged. Canon's guidance is direct, which is to make sure MP Drivers is installed, and if it is not installed, install MP Drivers from the Setup CD-ROM or Canon's website.
Download the Print Driver and Scan Utility installer from Canon's official support site for this model. The Scan Utility installs automatically with the print driver, so a single installer covers both.
On Windows the scanning software is IJ Scan Utility with the ScanGear scanner driver. On macOS, scanning uses the driverless IJ Scan Utility Lite, and AirPrint and Mopria are also supported. Note that Canon's official spec page lists operating-system support as Windows 10, 8.1, and 7 SP1, and Mac OS X 10.12.6 through macOS 10.15 Catalina.
Pick the Right Scanner Entry in Your App
When your application offers more than one scanner, the wrong choice can break the scan. Select your scanner or printer in the app's menu, but watch for duplicates.
Canon warns that if your scanner or printer name is displayed multiple times, select the one that does not include WIA. Choosing the non-WIA (TWAIN) entry routes the job through the correct driver, and your application must support TWAIN for ScanGear to start at all.
Reselect the Printer for Network Scanning on Windows
For Wi-Fi scanning on Windows, the printer has to be selected inside Canon's network scan helper. If it isn't, the computer simply won't see the scanner over the network.
- 1.Right-click the IJ Network Scanner Selector EX icon in the system tray.
- 2.Choose "Settings...".
- 3.On the "Scan-from-PC Settings" screen, under "Select your scanner or printer from Scanners," select your TR8620a.
- 4.Click OK.
Then open IJ Scan Utility and, for Product Name, pick "Canon XXX series Network" so the utility uses the network connection rather than a local one.
Turn On Scanning From the Printer's Panel
If you start scans by pressing Scan on the printer itself and it can't find the computer, the operation-panel scan permission may be off. This is handled in the macOS scanning utility.
- 1.In IJ Scan Utility Lite, open the Scan-from-Operation-Panel Settings screen and select the "Enables scanning from the operation panel" checkbox.
- 2.Click the Refresh button in the IJ Scan Utility Lite main screen.
- 3.Search for the computer again from the printer's operation panel, then retry the scan.
Grant the Canon App Local Network Access on macOS
Recent macOS releases gate device discovery behind a privacy permission, and Canon's scanning app needs it to find a printer on Wi-Fi. On macOS Sequoia 15 and Tahoe 26, network device discovery requires this access to be enabled.
Open Apple menu > System Settings > Privacy & Security > Local Network, then turn on access for the Canon scanning app (such as IJ Scan Utility Lite, listed as CIJSULAgent). With that toggle on, the app can locate the TR8620a across your network.
Sort Out Mobile Scanning in the Canon PRINT App
To scan from a phone or tablet, use the Canon PRINT app, which requires iOS 16.0 or later or Android 7.0 or later; it was previously named "Canon PRINT Inkjet/SELPHY." If the app can't reach the printer, the fix is usually about the network.
Confirm Wi-Fi is enabled on your phone or tablet, and that the printer and the device are on the same network with matching SSID and password. Placing the printer and router close together also helps the connection hold, which matters more given the printer's 2.4 GHz-only radio.
The Last Resort Reset and Re-Add
If nothing above restores scanning, reset the printer from its operation panel using the "Reset setting" menu, then set it up again. The menu offers several scopes, including "Web service setup only," "LAN settings only," "Telephone number only," "Settings only," "Fax settings only," and "Reset all."
To clear network problems while keeping other settings, choose "LAN settings only." For a full factory reset, choose "Reset all," which reverts all settings and the administrator password to default.
Be aware of Canon's warning before you do this, since initialization "erases all network settings on the printer, making printing or scanning operation from a computer over a network impossible." After a reset you must redo the Wi-Fi setup and reinstall the print driver and Scan Utility, so treat this as a final step rather than an early one.
Frequently Asked Questions
Why can't my TR8620a connect to my Wi-Fi network?
The PIXMA TR8620a uses Wi-Fi on the 2.4 GHz band only (Wireless LAN, 2.4 GHz, IEEE 802.11b/g/n) and has no 5 GHz radio. If your router broadcasts a 5 GHz-only network, the printer cannot join it, so connect it to your 2.4 GHz SSID and make sure your computer can reach that same network.
I see my scanner listed twice in my app. Which one do I pick?
Pick the entry that does not include WIA. Canon advises selecting the non-WIA option, which routes scanning through the correct driver, and your application must support TWAIN for ScanGear to launch.
Do I need to install separate software for scanning?
No. The Scan Utility installs automatically with the print driver, so downloading the Print Driver and Scan Utility installer from Canon's official support site for this model covers both functions. On Windows that means IJ Scan Utility and ScanGear; on macOS scanning uses the driverless IJ Scan Utility Lite.
My Mac stopped finding the printer after a macOS update. What changed?
On macOS Sequoia 15 and Tahoe 26, network device discovery requires a Local Network permission. Go to Apple menu > System Settings > Privacy & Security > Local Network and turn on access for the Canon scanning app (such as IJ Scan Utility Lite, shown as CIJSULAgent) so it can find the printer over Wi-Fi.
Will resetting the printer delete my scan setup?
Yes. Canon warns that initialization erases all network settings on the printer, making printing or scanning from a computer over a network impossible until you reconfigure it. After choosing "LAN settings only" or "Reset all" from the "Reset setting" menu, you must redo the Wi-Fi setup and reinstall the driver and Scan Utility.
