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, comprising:

• a housing having a top, a bottom, a front, and a rear positioned between a first side and a second side of the housing, the housing has a reservoir for holding toner, the housing has a side-to-side dimension that runs from the first side to the second side;
• an electrical contact positioned within a pocket on the first side of the housing, the pocket having an opening facing the front of the housing to permit an electrical connector of the image forming device to enter the pocket and mate with the electrical contact when the replaceable unit is installed in the image forming device, the electrical contact is electrically connected to processing circuitry mounted on the housing;
• and
• a first guide wall and a second guide wall each positioned outside the pocket on the first side of the housing closer to the front of the housing than the opening, the first guide wall positioned closer to the top of the housing and the second guide wall positioned closer to the bottom of the housing with a gap between the first guide wall and the second guide wall, the first and second guide walls each include an inclined surface that is inclined along the side-to-side dimension of the housing in a direction from the front to the rear, the inclined surfaces of the first and second guide walls are inclined in the same direction along the side-to-side dimension in the direction from the front to the rear permitting contact between the inclined surfaces of the first and second guide walls and the electrical connector of the image forming device to move the electrical connector of the image forming device along the side-to-side dimension toward the electrical contact during insertion of the replaceable unit into the image forming device with the front of the housing leading.