Abstract: A mechanism for supporting said light-emitting device in said reproduction apparatus in an electrographic reproduction apparatus having a light-emitting device for forming, on a dielectric support member, a charge pattern corresponding image-wise to information to be reproduced. The light-emitting device support mechanism includes a carriage attached to the reproduction apparatus and movable relative thereto to a first operative position and a second remote position. A pivot mechanism is supported by the carriage so as to provide a pivot axis, the light-emitting device being mounted on the pivot mechanism for movement about the pivot axis. A reference feature is located in the reproduction apparatus, the reference feature located in a predetermined relation relative to the dielectric support member.