topic imageCLASS MF634Cdw black dots on left side of prints after toner replacement in Office Printers

imageCLASS MF634Cdw black dots on left side of prints after toner replacement

davidk95831 — Tue, 31 Dec 2024 15:17:12 GMT

I recently replaced all 4 toners in my Canon MF634CDW color laser printer. Now there are black dots along the left side of prints. The dots are equally spaced 2.5 inches from the left side of the paper and there is a black dot approximately every one inch from the top to the bottom of the paper. I printed a blank MS Word document and the black dots still appear on the print out. Is this a toner issue? Or is there a roller inside the machine that I need to clean? If it is a toner issue, is it necessarily the black toner that is causing the issue? I don't want to re-buy all 4 toners. I already did the Clean Fixing Assembly and Clean ITB functions in the Maintenance menu multiple times.

Re: imageCLASS MF634Cdw black dots on left side of prints after toner replacement

mreg — Thu, 02 Jan 2025 05:02:48 GMT

Sounds like a drum defect, most likely the black toner. Each toner cartridge has its own drum. If you still have the old black cartridge, put it in, and see if you have the same problem. If so, the cartridges have warranties. Might be time to call Canon to replace the cartridge.

Re: imageCLASS MF634Cdw black dots on left side of prints after toner replacement

Hector — Wed, 05 Nov 2025 16:58:54 GMT

Hello,

The issue looks like one of the toner cartridges are leaking or there is loose toner powder in the printer. In this situation, you can try removing all of the toner cartridges and inspect the inside of any for any loose toner powder that can be wiped up with a damp cloth. You can also inspect the black toner to make sure it is not leaking/damaged. Once you reload the toner, you can perform an ITB and fixing unit cleaning.

Re: imageCLASS MF634Cdw black dots on left side of prints after toner replacement

LarsPoulsen — Mon, 10 Nov 2025 18:06:26 GMT

I have seen this on my MF644Cdw, when I have been using off-brand toner cartridges. The cure was to throw out the cheaper cartridges and go back to the expensive Canon original cartridges.

Re: imageCLASS MF634Cdw black dots on left side of prints after toner replacement

shadowsports — Mon, 10 Nov 2025 19:03:43 GMT

This is often the case. There are reasons for purchasing OEM toners.