WCS switch problem

[cooldan]

I'm at my sister's place with zero tools. All we have are screwdrivers though I may be able to borrow from neighbours.

I spotted a credit dot and the kids told me that when 2 balls were locked then it waited for ages before releasing (ie did a ball search) so I readjusted that switch then opened her up and had a look in diagnostics:

Spotted a wire off L flipper EOS switch so I reattached it (tape, as no soldering iron here)

Switch 17 not registering (R inlane)
Switch 27 works fine
Switch 37 not registering (light magnet target)
Switch 47 works fine
Switch 57 not used
Switch 67 not registering (striker target 2)
Switch 77 not registering (2nd ball lock)
Switch 87 works fine
All other switches fine

So...... all duds are on row 7 but not all that row shows faults. Manual points me to J209-8 so I reseated J209. It also mentions U19

Any advice? Why only half the switches on that row? Any point trying to make a jumper wire and use J207 and J209 to locate the fault?

Cheers fellas.
Also dodgy Internet here that come and goes so ill check later

 

[bartron]

look for a wire that as detached in the ones you have mentioned, some times the schematics are not the same as in actuallity ie 27 and 47 are the next in the chain

 

[Moonraker]

yep check each of the switches (look at the none working ones first) and you'll probably see a wire off somewhere...

 

[cooldan]

White/purple wire was indeed disconnected at switch 67, well diagnosed!
I reattached it with twisty wire and tape, made a note to solder it on properly next time I'm down here, and left the machine fully functional to admiring looks from the pack of pinball-hungry kids. Fantastic stuff.