What do the different Status Monitor icon colors mean?
A green icon indicates the normal stand-by condition, a yellow icon indicates a warning, and a red icon indicates that an error has occurred. A grey icon indicates the machine is offline. You can also click the Troubleshooting button within Status Monitor to access Brother's troubleshooting website. (Page 12)
From the official Brother DCP-B7500D Monochrome Laser Multifunction Printer manual, page 12
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