Subject: Urgent Assistance Needed for HMI UNIOP ER04 Issue Dear Team, I am experiencing a problem with the HMI UNIOP ER04. Upon powering it on, I encountered an issue that is documented in the attached file. Can anyone help me identify the cause of this problem? Thank you in advance for your assistance!
Optimize the Contrast Settings on HMI Units with Keyboard Controls 1. Begin by powering off the HMI unit. 2. Simultaneously press and hold any four keys on the keyboard. 3. Once the system recognizes the special key sequence, the display will initialize with a completely black screen, and you'll see the red LED indicator in the upper left corner remain steadily lit. 4. After this step, you can restart the panel by turning it off and on again. This process will restore the contrast calibration settings to their original default values. For further details, refer to the user manual: [Exor International User Manual](http://www.exorint.net/docs/0/6429AE92A541ED22C1257C8500327BFB/$File/SN024-3.pdf)
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