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Reset Samsung All-in-One SCX-4521F

From Samsung site:

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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