Polaroid 636 Repair Manual page 41

45. There are two mechanical inhibits. When the counter reaches its blank setting, S1 is
prevented from closing. This is the same as the empty pack lockout feature on Pronto!
cameras.
46. Finally, when the camera is in the folded position, S10 is mechanically locked open by a tab
on the flash housing. This prevents the flash from being charged.
NO S1
35