Sony DNW-7/7P Operation Manual page 66

2
Press the EJECT button.
The cassette lid will open.
3
3
Check that there is no slack in the tape, then slide in the cassette
until it clicks into position, and close the cassette lid completely by
pressing near the engraved "PUSH".
Window outward
3-2
Chapter 3 Recording and Playback
1
Insert the cassette.
Push and close the
2
cassette lid.
Cassette lid