If your printer is not printing from a specific tray or source, try the following steps:

1. Check if the specified tray or source is empty.
2. Check if the printer is clean around the tray and source.
3. Check if the correct type of paper is loaded in the tray or source.
4. Check if the print settings matched the desired tray or source in print jobs.
5. Check if the printer driver is installed properly.
6. Check if the printer itself is in proper working condition.