A pagewidth printer includes a housing that defines a print media inlet and a print media outlet. A detector having a detector signal input, a first electrical output and a control output is electrically connected to the light bulb screw base. Also disclosed is an engine oil prepared by a process comprising mixing catalyst with ZDDP to form an additive mixture, heating the additive mixture to about 60\xb0 C. The key supporting part is formed below a back of the top face portion of the key body at a position spaced from the rear end portion of the key body toward the front end portion of the key body. In one embodiment, the support member is a conductive ring.