I had slid out the dev. chamber and reinserted ,plugged back-in connectors ,then bypassed the door switch..... screen came on saying EO20 "turn off then on" . I'm a tech(10yrs.) but not sure with this puppy what I need to do . I restrung the lower corona that was missing hoping to correct orginal pbm. which ..was no image.
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Re: have code EO20 on an NP4050
Black toner feed problem
the4050's were notorious for this problem.
open the hopper and vacuum out all the tone and locate th thin metal arm that rotates. I used to bend it inwards, so there would be a hump in the middle of the arm( so it does not touch the sides of the hopper. also check the auger that feeds the toner into the Devellopper to see if it is clogged. thirdly the motor for the hopper does go bad ( this is the one that turns the metal arm to mix the toner)
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A C2500 Code is as follows (direct from tech manual.)
Paper feed motor problem.
Poor contact in the paper feed motor connector terminals. Defective paper feed motor rotation control circuit. Defective drive transmission system.
Reinsert the connector. Also check for continuity within the connector cable. If none, remedy or replace the cable. Replace the paper feed motor. Check if the rollers and gears rotate smoothly. If not, grease the bushings and gears. Check for broken gears and replace if any.
Most of the time it is the motor if you power the unit down and unplug it. Wait 30 seconds power it back up and it should (key word) bypass the broken cassette. To find out if it is the motor you can switch the motors with cassette 1 and 2 they are the same.
Remove the waste bottle then the drum unit from the front of the machine.**Cover the drum unit so it is not exposed to the light.
Remove the Developing unit and empty the developer from the dev unit into waste bag. Once all the developer is removed...take the new bottle of developer and pour it all into the dev unit. Replace the plastic cover back onto the top of the dev unit. Re-install the dev unit back into the machine, then replace the drum unit back into the machine then replace the waste toner bottle. Close the front door. Enter the copier adjustment mode on the keypad by pressing "user preset,Orig size(Ledger), and Multi-copy key #3 in sequence.
Then press Multi-copy key #8 , then press the Print key.
Now select th code "09" and Press Print.
The machine will run for approx 2 minutes to initialize the new developer. Press Clear/stop and User preset to escape from the service mode. You are done.
The NP 4050 has been known for given blank copies... Is the developing unit locked in place... There is a Grey or blue lever inside the front door to the right... It is under the toner hopper. It's been along time... I believe the lever should be clicked to the right and up. Also there is a locking screw that holds it in place, Most times that screw is missing and the unit falls away from the drum unit and you get blank copies and the front door will close.. Good Luck
Poor contact of deck level switch 2 connector terminals
Reinsert the connector. Also check for continuity within the connector ble. If none,repair or replace the cable. causes Defective paper deck motor 2. solutions Check for continuity across the coil. If none, replace paper desk motor 2
causes Poor contact of paper deck motor 2 connector terminals. solutions Reinsert the connector. Also check for continuity within the connector able. If none,repair or replace the cable. causes The deck right lift does not rise properly. solutions Check the gears and belts, and remedy if necessary.
e0020 is to do with there not being enough toner in the developer unit.
Firstly it may be a good idea to check/change to toner cartridge.
Switch off and disconnect from mains for the next bit.....
If ok remove the developer roller, cover is above the manual tray on the right hand side then once inside dev unit has connectors at either side, check they are properly seated. If you need to remove the dev there are several black screws around a metal plate all need removing. The roller should be black with toner. May need replacing depending on age and usage of copier.
ok so this is a code for the atr sensor.. you said you changed it is that the one right above the black dev that has the connector that plugs up under the control panel. if it wasnt take that one out and clean it... you can also check under serv mode copier display dens and see what iy says under window for each color they should be around 100 you may want to try to clear R-CON but then you need to put all adjs back to door specs
How about this, Take the developing unit out and take the ATDC sensor out and plug the hole up in the developing unit. Reinstall the developing unit and cheat the front door switch and plug the sensor back in and hold it in your hand and make a copy. Dose it vibrate? If it dose not the sensor is bad... If you really get tired of working on the problem and you don't go to the copier to often and they are not billable, try this.... Take the top cover of the dev. unit and spoon toner into the dev. unit till it is almost full and reinstall it and clear the error code in service mode and just remember to add toner in to it every so often.