Samsung DSR-1/1P - Manual (Page 37)

Chapter 3 Shooting
Chapter 3 Shooting
37
Checking the tape for slack
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 holder,
close the cassette holder, and after about 10 seconds take it out.
See page 39 on how to insert a cassette.
Paper clip, etc.
Reel