Service Mode (Tech Mode); Entering And Exiting Service Mode - Samsung CLX-8640 series Service Manual

4. Troubleshooting

4.5. Service Mode (Tech Mode)

4.5.1. Entering and Exiting Service Mode

To enter the service mode, press 1,2,3 number keys simultaneously. When the password dialog box appears, enter
"1934" and press the "OK" button.
To exit the service mode, press the home button or back button.
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