I am a newbie to this board and to slot machine repair so please bear with me.
I have an IGT S+ which showed error 12 - I changed the battery and am now getting error 21. I have verified that the comparator is seated properly and that the acceptor does not have coins jammed in it. I have not yet verified that the coin optics is not blocked because I haven't figured out how to do that - but I have the service manual and am still reading.
However I notice that the molex connector for the comparator has a 5 wire cable but only three wires are connected; leaving a yellow and black wire unattached. I cant tell by looking into the connector if they ever were attached. Could someone tell me whether that connector should have a 3 or a 5 wire connection?
I have attached a photo of the comparator and molex connector with the 2 wires circled in red.
Thanks in advance.