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You can check whether you have continuity from the cartridge contacts to the rca plugs using a resistance meter. If you dont. remove the cartridge together with the plastic cartridge contact plate and try to spray some contact cleaner on the connections. If you look in the cartridge shell you may see a small pcb with contacts and that is usually where the 'contact' problem lies. Also make sure that the pins are inserted correctly to the cartridge. good luck