Cartridge slot oxidation and contact wear
The Atari Jaguar's cartridge slot uses an edge connector design that develops contact oxidation after three decades. Cleaning the cartridge contacts and slot pins with isopropyl alcohol restores contact in most cases. The Jaguar's cartridge form factor is larger than 2600 and 7800 cartridges, but the edge connector cleaning process is the same. Physically damaged slot connectors are a less common but possible fault on units that have seen heavy use.
