Audio2000's AKJ780D - Manual (Page 25)

ALL IN ONE KARAOKE PA SYSTEM - - /
Use the DISC select button on the front panel or DVD select button on the remote control to directly select the desired
DISC MODE. Do not put DISC into the tray. When the graphic display on the front panel displays”NO DISC”, insert
USB or SD CARD to the USB or SD CARD jacks and then begin to load the media sources from USB or SD CARD.