A printhead maintenance assembly for maintaining a printhead in an operable condition is provided. A method comprises altering a spatial relationship between a spatial light modulator and a light incident on the SLM, shifting light modulator states of a first portion of light modulators to a second portion of light modulators, and placing a third portion of light modulators in the SLM into a performance degradation-reducing mode. In other embodiments, the sound attenuating conduits are stacked together, and shaped to increase the air flow cross-section. The second circuit prevents the additional signal from being received by the first circuit when the auxiliary contact is in a position indicating that one of the main contacts is welded. Confidence levels are associated with one or more of the map coordinates and image coordinates. Chemokine receptors are also provided.