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1. Power down the printer if it is on already, or restart it if it is off.
2. When powering up or restarting, press the UP, DOWN and HELP buttons simultaneously while it boots.
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1. Once it boots up into the Maintenance Menu, scroll down to the option called Diagnostic Mode.
2. Press Enter to select it.
3. Press the BACK, UP, DOWN, and ENTER keys simultaneously. You will then see a screen that says initializing.
4. Press up once or twice and you will then see ENV. at the top.
5. On this screen, you will then see the humidity measured by percentage on the 2nd line.
6. To get out of this menu, shut down the machine by using the power switch. **Note: This is the only time where it is safe to power the printer down by using the switch. Otherwise, it is better to press the "Shut Down/Restart" button on the front during normal operation.
7. Once the machine has restarted, make any necessary adjustments to bring the humidity within the suggested levels.