The email arrived on a Tuesday afternoon. "Quality audit next week," the client wrote. "Please have equipment documentation ready."
I looked at the three Canon printers on our production floor. Maintenance logs? Yes. Ink levels? Checked daily. Admin passwords? I had no idea where those were documented.
In my role, I review every packaging proof before it reaches a client—roughly 200 items a year, and I've rejected about 12% of first proofs in 2024 due to color mismatches. The Canon imagePROGRAF PRO-1000, our Canon fine art printer, is what makes the other 88% possible. It's a precision instrument. It produces gallery-quality proofs that we use to show clients exactly what their packaging will look like on a shelf.
But it turns out precision instruments need precise administration, too.
The irony isn't lost on me. I spend my days checking colors, measuring dimensions, and rejecting proofs that don't meet spec. I'd never checked the printer's own security settings. The printer was producing exactly what we needed, so I stopped looking at the machine itself.
That was the mistake.
The Password Hunt
The audit checklist included "printer security settings." To show those, I needed to log into the printers' admin panels. And I had no idea what the passwords were.
I started with the usual guesses.
"admin/admin." Nope.
"canon/canon." Nope. (Older Canon models did ship with "canon" as the default admin password. The newer ones are smarter than that.)
"1234." Nope.
I flipped through manuals, maintenance logs, even an old equipment binder that should have held the credentials. Nothing. The person who configured the printers left two years ago, and nobody had recorded the passwords. Classic rookie mistake. I'd been auditing our products for years, but I'd never audited our own printer access.
Then I actually looked at the hardware instead of the paperwork.
On the back of the imagePROGRAF, there's a small label with the serial number. For many Canon printers manufactured in the last several years—especially imagePROGRAF and imageRUNNER series—the default admin password when the device is first initialized is that serial number. I typed it in. The admin panel opened.
If you're looking for the admin password for Canon printer models and the previous admin didn't leave documentation, here's where I'd start:
- Check the serial number label. It's usually on the back or bottom of the printer. On newer models, that serial number often serves as the default admin password.
- Try "canon" on older units. Common on models manufactured before roughly 2015.
- Look in your password manager or asset registry. If your company tracks equipment credentials, the password might be under "printers" or "network devices."
- Factory reset only as a last resort. This wipes network settings, print profiles, and custom paper configurations. You don't want to rebuild those unless you absolutely have to.
I called Canon support to verify the serial-number method. They confirmed it, and I changed the password to something documented. Then I wrote it down in the equipment binder—the actual binder, with a date, a signature, and a note to review it quarterly.
The Side Quests
That same afternoon, two unrelated problems showed up. Both felt trivial. Both turned out to be relevant.
How to Remove Permanent Marker From Plastic
One of our team members had used a black permanent marker to label the plastic storage bins holding prototype samples. Fine at the time. Problem: we needed to relabel those bins for a client project, and the permanent marker wouldn't come off. Soap and water did nothing. A magic eraser scratched the plastic before removing the ink.
If you're wondering how to remove permanent marker from plastic, the answer is isopropyl alcohol—rubbing alcohol. We already had it in the quality lab for cleaning equipment. Dab it on a cotton cloth, rub in small circles, and the marker dissolves in seconds.
There's also a trick that works in a pinch: draw over the permanent marker with a dry-erase marker, let it sit for about a minute, then wipe everything away. The solvent in the dry-erase ink breaks down the permanent marker.
That little incident became a new labeling SOP. The connection to quality? Traceability. If you can't label samples consistently, your quality trail has holes in it. And if your labels aren't removable, you'll be stuck cleaning them later.
While I was writing that SOP, I also looked at what the labels themselves claimed. Per the FTC Green Guides, environmental claims like "recyclable" need substantiation. We changed our bin labels to be more specific—no more vague "eco" wording.
The Matrix Multiplication Calculator Moment
At the end of that week, I needed to finalize our supplier quality scores—four suppliers, six criteria, three months of data. The spreadsheet had the numbers, but I wanted to sanity-check the weighted totals. So I did what any old-school quality person would do: I pulled out my Texas Instruments calculator (a TI-36X Pro I've owned since grad school).
You can do matrix multiplication on a TI calculator in a few keystrokes. I typed the values into an online matrix multiplication calculator on my phone, then compared the spreadsheet's weighting scheme against two alternatives using my TI.
The spreadsheet was wrong. The "on-time delivery" weight was set at 15% when it should have been 20%. The supplier rankings would have come out differently, and we might have made a sourcing decision based on incorrect math.
Nobody would have caught it. The spreadsheet formulas were correct. The data was correct. One number in the input was off—and it happened to be the one number nobody had checked.
If those scores had gone out as-is, we would have ranked our suppliers incorrectly for the next quarter. The wrong supplier at the top of the list could have cost us far more than a reprint.
The Real Lesson
The audit itself went fine. We showed the printer security settings. We walked through the labeling SOP. I showed the auditor the password binder. He said most small companies don't have that level of documentation. That felt good, but I kept thinking about the timing.
If that client email had arrived a day earlier, or if I'd dismissed the permanent marker as someone else's problem, the audit could have gone differently. Small cracks become big cracks when nobody catches them early.
That vendor failure in March 2023 taught me about backup planning. This was a second reminder: the tools we trust the most are the ones we document the least.
What was best practice in 2020 isn't enough in 2025. The industry is evolving—smart printers need smart administration, and the old "set it and forget it" approach doesn't hold up. But some fundamentals haven't changed: you document, you verify, and you review. That's the core of quality management, whether you're inspecting a printed label or a supplier's quarterly scores.
The experience also changed how I think about our printing strategy. We still use online print services for overflow work—the unit price can look attractive. But total cost of ownership includes shipping, turnaround, and the hidden cost of a reprint. Sure, a proof can go through USPS First-Class for $0.73 in a standard envelope as of January 2025 (usps.com/stamps). That only works if the proof is right the first time.
So, if you're stuck on that admin password right now: start with the serial number. It solved my problem in about a minute. Then write it down somewhere your future self—or the person who inherits your job—can find it.
Because you never know when a Tuesday-afternoon email is going to turn into a test of your entire quality system.