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Sir/mam, you might have a bad drum density sensor or it was not cleaned or was destroyed by static electricity, if a vacuum cleaner was use to remove the old developer, NEVER use a vacuum cleaner for that procedure. Remove the drum and will see a small sensor near where the cleaning blade sits need to clean it replace it. Worse case the main control board is bad that what sensor talks to .Was the L Detect procedure run after the developer was replaced, and before you replaced the developer did you clear the developer counter, to let machine know it has new developer, because clearing the counter is the only way the copier has new developer, did you clear the counter for the new drum? The machine use the counters to determine voltages for certain assemblies. If L detect was not run and copies or prints where made get new developer and start over.
It's not developer light. It is drum unit light and maintenance. You have to replace the Drum, Blade and Developer. After changing them you have to reset the maintenance, drum,developer counter. This procedure must be made by a copier tech.
But if you still want only the developer the code is AR-202D
send a print / copy through the machine stop the machine via the main switch before toe paper has come out remove the drum unit
you should now be able to see part of your print on the drum if you can also see the black line check for obstructions in the light path if these seem fine the chances are the dev or cleaner blade seals have spung a leak ( time to replace the drum cartridge
Power off the machine, switch on while pressing 0 & 8, enter 200, then press the start button, the machine will run for about three minutes to adjust the Toner sensor. The machine will stop, press the interupt button to save the setting, switch off and then on.
If the older techies is reading this, please help to confirm.