The ornamental design for a discplayback apparatus, as shown and described.
FIG. 1 is a front view of a disc playback apparatus of my new design;
FIG. 2 is a rear view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is a top, front and right side perspective view thereof; and,
FIG. 8 is the disc playback apparatus with a disc thereof.
The disk shown in broken lines in FIG. 8 and other broken lines in FIGS. 1-8 are for the purpose of illustrating the environment only and forms no part of the claimed design.