In my previous post I wrote about Lexmark T-Series fusers in general. Now I’ll get more specific. In this post I’ll try to provide some, hopefully interesting, observances about individual model idiosyncrasies, challenges and opportunities.
Remember, I’m not trying to tell anybody how to troubleshoot. Nor am I claiming that all the information contained here is gospel. This is just some stuff I’ve noticed, experienced and talked with other techs about over the years. It’s information that’s worked for me. I hope it works for you.
At the outset I’d like to say that Lexmark fusers are ‘complicated simplicity’. I said in the last post that Lexmark hasn’t changed much of the basic design since the Optra S. That’s the ‘simplicity’. The ‘complicated’ enters the picture with the number of little variations within each model according the Type Number.
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