Pokie machine 3 games in one comes with stand

Paid $650. 12 months ago came up with hopper error when a visitor tried to push cash out when there was no cash in the machine tried to reset but didn't was going perfectly before this happened. Machine takes note and coins. I think this error would be an easy fix for someone who knows what there doing. I've been told my people who own identical ones that the machine just needs a couple of batteries I've add a pic to show.