Hey pinside- I’m working on a mystery and would love any advice or shared experience.

I’ve recently acquired a CFTBL- it was shopped and in great shape- but after delivery has an odd glitch. The left return lane triggers an outlane (Focus!).

I’ve spent a good amount of time in the switch test menu and can’t find anything shorted or being double triggered. The left return shows left return and both outlanes trigger appropriately.

The seller thinks it’s a software glitch and is willing to send a new software chip. I can’t find any others who have experienced this - so thinking they may be right.

Any advice? Anything else to try before swapping chips?

I greatly appreciate the expertise!!

Thanks LTG. So far I’ve tested every switch in the menu and have verified in the matrix that each name registers correctly and nothing is doubled up. All lights are functioning normally (not sure how to test the direction of the diodes, but I’ll do more research), and other items like poppers and motors are working fine.

Do you have any suggestions on how to narrow down the problem area?

Fixed! There was a switch wire that was broken (white/red)- and a jumper that was tapped into another location. Issue was- the jumper tapped into the coin door switch, and although it was the same wire, it’s apparently on a different circuit (separated by a dotted line on the matrix). I tapped into the wire just before the board and- viola! Works perfectly.

Thanks for the advice - really appreciate it!