Replaceable unit for an image forming device having a retainer assembly having positioning features for processing circuitry

A replaceable unit for an electrophotographic image forming device includes an electrical contact positioned within a pocket on a first side of a housing of the replaceable unit. The pocket has an opening facing a front of the housing to permit an electrical connector of the image forming device to enter the pocket and mate with the electrical contact. A first guide wall and a second guide wall are each positioned outside the pocket on the first side, in front of the opening. The first and second guide walls each include an inclined surface that inclines outward from the first side of the housing in a direction from the front to a rear of the housing to move the electrical connector of the image forming device toward the circuit board during insertion of the replaceable unit into the image forming device.