7. When Replacing the Light-Blocking Belt1) Take up the belt q on the bobbin w by turning it clockwise, and tape it in place.Figure 3-5252) Fix the light-blocking belt mount in place on the lens mount.3) Turn the bobbin clockwise and counterclockwise by giving it several half turns; then,release it so that the spring inside the bobbin is free.4) With the bobbin turned 2 to 2.5 times clockwise, detach the tape, and slide out theend of the belt.5) Hook the end of the belt on the lens unit.qweCOPYRIGHT © 1997 CANON INC. CANON NP6045 REV. 1 MAR. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)CHAPTER 3 EXPOSURE SYSTEM3-31