HP LASERJET 3600 - Manual (Page 12)

17. Prepare the MDA for installation. Two areas must be checked:
a. Make sure that all the white shafts are pushed to the right (clockwise) when the MDA
is oriented as shown below (See the blue arrows in the image below.). The shafts are
aligned correctly in the picture.
NOTE: It is important that the ETB guides are in the up position to
make installation of the MDA smooth.
Hint: Rotate the shaft all the way to the right side first (as far as possible) then push
them back a little to the left they will come to a hard stop. Leave them there. Look at
the lines marks on the metal frame of the MDA (yellow arrows).