Hold down tray conveyor

A cleaning apparatus for cleaning electronic substrates including printed circuit boards and semiconductor product assemblies, the cleaning apparatus comprising:

• at least one cleaning module configured to treat electronic substrates;
• and
• a conveyor system configured to transport the electronic substrates through the at least one cleaning module, the conveyor system including
• a first outer frame member,
• a second outer frame member spaced from the first outer frame member,
• a bottom belt disposed between the first outer frame member and the second outer frame member,
• a top belt spaced from the bottom belt, the bottom belt and the top belt being configured to receive a product carrier therebetween to transport electronic substrates along the conveyor system and through the at least one cleaning module, and
• a plurality of roller assemblies, at least one roller assembly being coupled to the first outer frame member and at least one roller assembly being coupled to the second outer frame member, each roller assembly being configured to apply a force on one of the top belt and the bottom belt.