TA Triumph-Adler P-4030 MFP - Manual (Page 191)

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Operation on the Machine > What is Document Box?
Removable Memory Box ( page 5-43 )
A USB memory stick can be connected to the USB port on the machine to print a saved PDF file. You can print PDF data
directly from the USB memory without a PC. Image files scanned using this machine can also be saved to USB memory
in the PDF, TIFF, JPEG, XPS or high compression PDF format (Scan to USB).
Sub Address Box/Polling Box
Sub Address Box/Polling Box store the fax data. For details, refer to the FAX Operation Guide.