I'm trying to diagnose a lamp board on a Stern Stars. I got all of the controlled lamps working, however the TILT lamp is giving me bit of a stumble. I replaced the SCR (MCR 106-1) with an equivalent from PinballLife https://www.pinballlife.com/mcr106-8-replacement-scr-for-early-solid-state-pinball-machines.html
I question which way the correct way is, since it's not really labeled in any way. Does anyone know if the "silver" side should be facing to the left or to the right?
Second question is - after replacing above mentioned SCR, I did get the lamp to work in test mode, but only after moving the wire to the correct pin. It's been a while since I've had to read a schematic (and sorry for the stupid question), but I'm assuming the position on the schematic is the same position on the connector? In this case, the TILT lamp is the 3rd from the bottom on J2 and should be so on the connector. Right?
Stars lamp (resized).jpg
With that said, after moving the connector to the 3rd from bottom pin, the lamp will work in test mode (as mentioned earlier), but when I tilt in a game, the lamp does not turn on. Also, it turns on when the "WOW" lamp is lit, and stays on afterwards if the "WOW" lamp is NOT lit (completing another set of drops to move the lamp to SPECIAL), which is why I'm questioning whether or not it is on the correct pin.