Printer doesn't print and give error information below,why?

546 is an unstable fusing temperature:

-Fusing thermistor defective

-Power supply board defective

-Defective connection of fusing unit

sc546 is a fuser ready temp problem.
it requires a reset procedure: enter SP mode.touch Copy SP..touch SP DIRECT then press 7807# on the keypad then execute...turn power off and then back on

SC 546 - Fusing ready temperature malfunction,unstable fusing temperature.Chek the fuser unit upper fuser roller thermistors,if dirty clean it,check the fusing unit connection or change the thermistors.

Repair fuser and reset code

Hi,

The steps below should help you override the error and make the printer accept the cartridges and allow you to print.

Instructions

1. • 1

     Remove and replace the print cartridge. If that doesn't solve the error, move on to Step 2.
     

   • 2

     Remove the print cartridge from the machine.
     

   • 
     
   • 3

     Wet the end of a cotton swab with rubbing alcohol.
     

   • 4

     Wipe the copper colored contacts on the print cartridge with the cotton swab to clean.
     

   • 5

     Wipe the contacts in the printer where the cartridge sits.
     

   • 6

     Replace the cartridge and try a test print. If removing residue for a clean connection didn't solve the error, move on to step 7.
     

   • 7

     Turn off the printer.
     

   • 8

     Unplug the printer from the power source and leave it unplugged for 15 to 30 minutes. This will reset the printer.
     

   • 9

     Plug the printer back into the power source and turn it on.
     

   • 10

     Print a test page.
     

Regards,
Suhail

replace thermostat in heating section or u yuor tirmistor is directly touching the heat roller

It could be due to cartridges in the printer. Try the steps below to identify and fix the problem:

1. Make sure the printer is on.
2. Open the printer cover. The print cartridge carrier moves and stops at the loading position, unless the All-In-One is busy. Note: If the carrier does not automatically move to the center, turn off the printer or unplug the printer from the power source and then carefully slide the carrier to the center.
3. Remove both cartridges from the carrier.
4. Close the printer cover.
5. Re-brick your printer by pulling out the power supply - black box behind the printer where the power cord is plugged in to, and re-plug after 30 seconds.
6. When the printer turns on, reinsert one cartridge first. Close the printer cover and check for any errors.
7. If no error appears, reinsert the other cartridge. Close the printer cover.
8. Replace whichever cartridge is causing the error to appear with a new genuine Lexmark cartridge. Try to print a document again to verify that the problem is fixed.

If that doesn't help, try this approach:

Try to re-seat the cartridges in the printer. Open the printer cover > remove the cartridges > close the printer cover > re-brick you printer by pulling out the power supply - black box behind the printer where the power cord is plugged in, and re-plug after 10 seconds. When the printer turns on, reinsert the cartridges and close the cover. Try to print a document again to verify that the problem is fixed.

If that doesn't help, the problem could be due to a clogged print cartridge nozzle. Please follow the steps below to fix print quality issues with your model:

1. On your computer, go to Start menu.
2. Go to Programs.
3. Go to Lexmark 4200 Series folder.
4. Select Lexmark Solution Center.

From the Maintenance tab, select Align to fix blurry edges. Your printer will then print a page that will help align the cartridges.

thermal fuse blown this guy says


Ricoh Error Code SC541 sc542 sc 543 sc544 sc545 sc546 Lanier Savin...

simply switch it off then switch it on
if the Problem still you need to check Paper tray i think there will be some mismatch between the Paper size and the tray
or some Paper will be stuck in it

Fusing thermistor defective
The ROD was engulfed with powder not allowing to rotate. When removed everything was normal- SC546