Where does the small grey ribbon go......

I just took my saturn apart to clean it up a bit. there is this small grey ribbon that comes off the side of the laser unit. where is this supposed to go? i forgot where it went.
 
there are 2 ribbon cables coming from the cd board. One screws into the metal plate that goes over the mainboard, the other one slides into a slot on the right hand side of the mainboard.
 
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