I have an Aficio 220 photocopier. When I turn it on it reads "functional problems SC 541. Please help.

it really need to be wrote which specific functional problem is showing, as example SC 541.

SC 390 on an Aficio 1018 will most likely be a bad TD (toner density) sensor, if you've already replaced the drum and developer. (One thing to check quickly though is to pull the PCU out and reinstall it, just to make sure that connection isn't the problem.)

You can either replace the TD sensor by itself, or replace the DV unit (which probably won't be much more expensive). But either way, you'll need to install new developer when you replace the parts.

SC 451 ? Do not exist... May be SC 541 ? Fusing error...

SC541 = The melting temperature measured by thermistor is less than 71 C

The problem lies in the fuser:
- Thermistor fuser defective or incorrectly installed
- Fuser Lamp failure

Solution: Replace Fuser

YOU NEED TO RESET THAT CODE

Take the fuser out and clean under the thermistors, and reset the code by entering test mode ( turn off printer hold down online and escape as you turn on printer selece 2 engine go to sp5-810 and reset this.
-Carl, please let me know if this helps.

i have a aficio 270 copier. a error code 750 is on display.kindly tell us about this code and solution

Its a fuser code. Hold down both of the arrow keys for 10 seconds, then press enter. Select 2 for engine, ok, select 7 for data log, ok, scroll to 7807 and execute. exit all of the way out until you get back to engine, then select 3 for end. Recycle power.

For the Aficio 1018. SC-320 is laser failure - the polygon mirror motor inside the laser has failed and needs replacing. You will need to contact your nearest service agent for repair.

For your RICOH Aficio 1013F - SC-551 is overheat in standby mode as far as I can tell. The circuitry that controls the fuser section ie manages the heat has problem. Unless its right near a source of heat like a heater or has no circulation around you machine you will need contact a repair agent for this machine also.

500's usually means overheating problem
contact service support from your local authorized dealer