Brian has talked about this briefly in an earlier post on this blog (see it here) but since I ran into this problem on a few machines recently I thought I would elaborate on this problem. On most machines the primary charge roller is located in the print cartridge so when you replace the cartridge you replace the charge roller. In Lexmark and Kyocera printers the charge roller is separate from the print cartridge; therefore, it doesn’t get replaced as often and has more opportunity to cause print related problems.
The charge roller puts a charge on the drum before the image is written to it. If the charge roller has too much build up or debris, like label glue, gets on the surface then the part of the drum unit that area touches doesn’t get properly charged and spots or gray background will result.
On Lexmark machines the charge roller is easily seen by removing the print cartridge and looking up in the cavity of the machine. It will be a light tan roller about a foot in length. The one I saw on the T630 I was working on looked OK but Continue reading →
It’s important to be familiar with each model of Lexmark printer that you maintain or repair. Study and compare the fuser drawings and you’ll find many of the design elements are the same. However, differences in print speed require different lamps, backup (pressure) roller sizes, heat roller construction, thermal fuses, and thermisters. And although the lamp contact assemblies are basically the same, their installation can vary widely. Notice also that some fuser elements vary within a given model according to the Printer Type Number (last 3 digits after the engine number found inside the front cover). These differences are important for image quality, and therefore, customer satisfaction. If there’s enough design deviation the result will be a 920 series Service Error Code. If not, the result will be service calls to adjust paper and fuser settings, dissatisfied customers and a shortened fuser life.
Lexmark Service Bulletins are an excellent source of information. For example, Bulletin #T65x 114 has good information on accordion type jams inside the fuser. I’ve included the section “Changing the type of fuser unit installed (T65x and X65x Series printers only) below. If you’re an Authorized Service Provider (ASP) Lexmark will email service bulletins to you directly. If you’re not an ASP they are available, on a limited basis, at the “Support/Download” part of Lexmark’s website. Also, check this blog and others like it, these experts should have this stuff memorized.
The following paragraphs are intended for your information.
They contain little things I’ve learned over the years on the job and from other techs. There is no intention, implied or otherwise, to try to tell anyone how to troubleshoot or repair any printer. I think there is some good information that worked for me at one time or another and hopefully it’ll work for you. Continue Reading