I've replaced f104 several times and after about 10 minutes of play it blows again. Verified I used the correct fuse. What is strange is the manual says f104 is for solenoid 9-16....but those solenoids work in test mode and 1-8 do not work. F105 is not blown. Really confusing. Appreciate any insight from pinsiders. Thanks

More info. Put in test mode - repeat- and solenoid 7 knocker sounds like it locks. It blew f104.

Thanks. Unplugged for now so I can get my pinball fix. Thx indypinhead will test transistors 68 67 62 and report back.

Too lazy to check the transistor. Been playing without knocker.