Sony 85P Operating Instructions Manual page 27

Preventing accidental erasure
Checking the tape for slack
No double insertion of cassettes
Set the REC/SAVE switch on the cassette to SAVE to prevent accidental
erasure of recorded contents.
To enable re-recording
Set the cassette's REC/SAVE switch to REC.
If you insert a cassette into the unit when this switch is set to SAVE, the
unit will not record when you press the PLAY button while holding down
the REC button.
Using a paper clip or a similar object, turn the reel gently in the direction
shown by the arrow. If the reel does not move, there is no slack. Insert the
cassette into the cassette compartment, and after about 10 seconds take it
out.
Paper clip, etc.
When you insert a cassette, the orange lock-out plate appears in the
cassette compartment to prevent double insertion.
REC/SAVE switch
Set to SAVE
REC
SAVE
Reel
Chapter 2 Recording and Playback
27