The digital signal is monitored in the CD recorder through an optical cable, but in the display appears the message "can't copy". CD recorder can copy from any analog source (RCA analog cables), but CAN'T copy from digital sources using a digital optical cable. This "CAN'T COPY" message does not appear in the troubleshooting manual!
Audio Players & Recorders - Teac - CD-RW880 CD Recorder
Answers & Comments
I suspect this is due to some form of copy protection. So you can't copy the digital signal.