An improved circuit board mounting system for use with a toner cartridge. The first circuit board mounting pad holds a circuit board with large electrical contacts that mate with printer-mounted contacts in numerous positions. A second circuit board mounting pad is positioned on a vertical wall of the waste bin and holds a circuit board with electrical contacts that mates with printers that mate with electrical contact pads positioned near the front left edge of the waste bin. The second circuit board mounting pad also accommodates a larger circuit board that supports larger components or a greater number of components.