The call I keep getting
Why does my Canon printer print but not scan? That question comes up more than any other in my inbox. The next sentence is almost always I think the scanner is broken. Maybe. But after four years of quality checking printers before they ship, I'd say the scanner is usually the last thing to blame.
A machine that prints tells you it has power. That's all it tells you.
I'm a quality/compliance manager at a refurbished print equipment distributor. I review roughly 200 units a year. Maybe 180, I'd have to check the log. In our Q1 2024 quality audit, scan failures were the second-biggest callback reason. Not paper jams. Not printhead issues. Scans. In 2025, I've rejected about 9% of first deliveries because the software setup notes were incomplete. That pattern tells me most scanning problems are not hardware problems.
Printing and scanning are two machines wearing one box
Here's the part that surprises most people. A multifunction Canon printer is not one device. It's a print engine and a scan engine sharing the same control panel. They don't share the same software path.
Printing uses a print driver and the operating system's spooler. Scanning uses a separate utility, usually IJ Scan Utility or ScanGear. The scan side often needs a different discovery protocol and different permissions. So a print job can succeed while the scan utility cannot even see the printer. When I say setup, I mean the whole software relationship, not just plugging in a USB cable.
When the Canon printer IJ Setup wizard runs, it can install both print and scan components. But the scan component isn't always selected by default, and it's often the one that breaks later. I've seen units where the print driver installed perfectly and scan never made it onto the computer. That's not a broken scanner. That's an incomplete setup.
The it worked yesterday problem
This is the issue that drives people crazy. The Canon printer printed yesterday, and the scanner worked yesterday. Today it doesn't. What changed?
Usually, software. Windows updates can reset firewall profiles or turn off network discovery. macOS updates can change file and network permissions. The print driver often has enough cached information to keep working, but the scan utility has to rediscover the device from scratch. If discovery is blocked, scanning fails while printing continues as if nothing happened.
I call this the one-time setup myth. People run the Canon printer IJ Setup once and assume every component is registered forever. It isn't. Rerunning the setup and choosing the repair option is often enough, but few people try that before moving the machine to another room.
The deeper reason: connection and discovery
Let's get technical, but not too technical.
Printing over a network can work through basic TCP/IP or the print spooler. Scanning often needs mDNS/Bonjour on a Mac, or WSD on Windows. If the printer sits on one subnet and your computer on another, say a guest Wi-Fi network, print jobs may still route through the router while the scan utility cannot find the device. I see this in small offices more than I expected. The laptop is on 5 GHz guest, the printer is on 2.4 GHz office, and the scan button silently finds nothing.
That's not a Canon-specific flaw. It's how network scanning works. And it's why I ask about the connection method before I ask about callback rates. If the printer can print, the main board is alive. A scan lamp can burn out, yes, but a total won't-start response is more likely to be a software permission or discovery problem. At least, that's been my experience with Canon inkjet and multifunction units.
What this costs you
Now the part I care most about: money.
When people have a printing-but-not-scanning problem, they usually ask two questions. Can it be fixed, and should I replace it? The second question is a total cost question, not a price question.
If you're comparing the price of a service call to the price of a new Canon printer, stop. You're leaving out the messy variables. Setup time, driver installation, a possible new cable, the learning curve of a different control panel, the cost of waiting two days for shipping, and the chance that the new machine repeats the same setup mistake. The lowest invoice price is not the lowest total cost.
Before you decide, pull out a decimal calculator. But only if you're going to put the right numbers in it. I tell people: include your own time. Include the time of the person who has to sit on hold. Include the cost of not being able to scan contracts, receipts, or sketches while the machine sits idle. That changes the math surprisingly fast.
The same logic shows up in 3D printing. A customer recently asked whether to buy a Bambu 3D printer or go with a resin printer. The resin printer vs 3D printer comparison looks like a spec sheet question, but it's really a setup and failure-cost question. A Bambu 3D printer is a solid choice for functional parts. A resin printer is better for detailed models. But if you choose either one without thinking about ventilation, post-processing, and maintenance, the purchase price is not your real cost. It's the same trap as choosing a new Canon printer before checking why the scan utility failed.
What I'd check first
If your Canon printer prints but doesn't scan, keep this list short:
- Open IJ Scan Utility on the computer. If the Canon machine isn't listed there, the scan software doesn't see it.
- Print a network status page from the printer's front panel and compare the IP/subnet with your computer.
- Re-run Canon printer IJ Setup and choose the repair or add-device option. This registers the scan driver again.
- Check OS permissions: on macOS, Settings > Privacy and Security > Scanner/Files; on Windows, check whether apps are allowed to access the scanner.
- Try a direct USB cable for one scan. If USB scanning works but network scanning fails, the hardware is probably fine. The network discovery path is the problem.
Canon's support pages, as of January 2025, center most scan troubleshooting on IJ Scan Utility and driver registration. Verify current steps on Canon's site before paying for a repair. If you ask me, the scanner is probably fine. The setup is the weak point.