Have you recently replaced the colour PCU? It may not be seated properly, otherwise there is likely a problem with it, and it's not turning (ie: a broken gear). It could also be the PCU drive motor, or control board. Sounds like you may need a tech to get to the root cause unless you have a spare PCU to try?? This also explains the colour registration problem.
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The SC441 error means one or more of the developer units (PCU) is not rotating. You have to take the PCU out to see which color isn't rotating. One of the doctor (cleaning) blades might be flipped, usually caused by lack of toner in the PCU. Basically, if you just open up the printer, latches and everything, and just make sure the parts are all able to move freely by giving them a bit of a test with your hand, then close the printer up turn it off then back on and it should be working.
Did you just replace your color PCUs (photoconductor units)? If so, one of the new units may be defective. Try reinstalling the old units to see if the problem goes away (after resetting the machine). If it does, you can replace the PCUs one by one to see which one is bad.
If you still get the sc441 even with the old PCUs (or if you don't have them anymore) install a set of new PCUs and that should fix the problem. On the off chance the problem doesn't go away even with new PCUs, contact your local service company because you may have a bad circuit board, motor, or gear.
sc441 is a drum motor error. It could be caused by anything from a faulty circuit board to a bad motor, but the most likely fix (and the easiest) is to replace the color PCUs (photoconductor units) which I believe all come as one set.
Turn the machine off and unplug it from the wall, then install the new PCUs, plug it back in and turn it on. There's a good chance your printer will work fine. If the sc441 error comes back, you should contact your local service company and have them take a look at it, because the problem is either electrical or mechanical.
SC441 indicates Development Motor Lock / Drum Peripheral Component Motor
Lock.the code indicated one of four things. It could be either the Color PCU, the
gears that drive the PCU, the motor or control board. The easiest of course is
to replace the color PCU, but that runs around $300, but the other parts
required a bit of disassembly to examine.
sc441 error means one or more of the developer unit(PCU) isnt rotating. you have to take the PCU out to see which color isnt rotating. there maybe one of the doctor blade is flipped, usually caused by lack of toner in the PCU.
One of our Ricoh CL3500N printers- less than a year old- gave us a "color regist error" after changing the transfer belt.
Ran the "adjust color regist" without results. It would just finish and pop back up with the same error.
Color test page printed no color, just BW
I reseated everything, and even replaced the PCU without positive results.
A couple hours later I went back, took everything out (be sure to keep the pcus out of the light!), and vaccuumed the heck outta that printer.
For whatever reason- maybe there was a chunk of toner hanging out, maybe I knocked something loose or back in place, whatever- but when I put all the parts in and turned it on, the error was gone and color printed great!