Looking at all what you told and posted here, your printer actually does not keep the input image size when getting jobs in PDF.
The most reliable format for printing on driverless printers is Apple Raster. But your printer seems to simply do not print anything when receiving Apple Raster and telling to the client that everything is correctly printed. This can be due to the low toner, but then the printer has to report back to the client when not being able to print.
Have you already tried to update the firmware of the printer (via appropriate functionality in the printer's web admin interface)?
Have you already tried to print in monochrome (black-and-white) mode? (At least if the culprit for the "toner low" is not the black toner, see printer's web interface).
Looking at all what you told and posted here, your printer actually does not keep the input image size when getting jobs in PDF.
The most reliable format for printing on driverless printers is Apple Raster. But your printer seems to simply do not print anything when receiving Apple Raster and telling to the client that everything is correctly printed. This can be due to the low toner, but then the printer has to report back to the client when not being able to print.
Have you already tried to update the firmware of the printer (via appropriate functionality in the printer's web admin interface)?
Have you already tried to print in monochrome (black-and-white) mode? (At least if the culprit for the "toner low" is not the black toner, see printer's web interface).