How To Reset Samsung SCX-4521f
1. – Press MENU # 1 9 3 4 in sequence rapidly. The LCD panel should now display TECH.
2. – Press MENU, and then press ENTER. The LCD panel will display Tech Mode.
3. – Press the left arrow (<) button once. The operator panel will display NEW CARTRIDGE. 4. - Press ENTER. The operator panel will display [YES]. 5. - Press ENTER. The toner warning message should be gone. 6. - To exit TECH MODE, press MENU # 1 9 3 4 in rapid succession, as if you were dialing a phone number. The operator panel should no longer display TECH. If problem persists, there may actually be a problem with either the toner cartridge or the SCX-4216F. Works for SCX-4521F
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