Hello everyone! Been an arcade guy for several years, just got into pins a few months ago. I recently acquired my second pin, a Williams Black Knight. Still working despite minimal maintenance over the years.
I noticed that some of the drop targets weren’t working properly. They had issues falling without being hit 2-3 times. I pulled all the assemblies, took them apart, cleaned everything, added new springs for the targets, and new coil sleeves. At first, everything worked great, then I noticed that the left lower and upper drop targets were having trouble resetting. It may take them several times to pop back up, scoring points each time they tried and didn’t.
I assumed that the coils were weak, so I ordered new ones. Here’s a link to what I purchased:
http://www.marcospecialties.com/pinball-parts/SA-23-850
I installed the coils yesterday, turned the machine on, and none of the solenoids worked on the table! Just the flippers. I looked in the back box, and the 2.5A fuse had blown. Fearing that I had somehow ordered the wrong parts, I put the original coils back in, replaced the fuse, powered on, and fuse immediately blew. I found that the only way that I could keep the fuse from blowing was to disconnect the solenoid power connector (located under the 2.5A fuse.). As soon as I tried to reconnect, the fuse would blow again.
I need some troubleshooting help. I have all the tools to check things(Multi Meter, Logic Probe, Soldering Station, etc.), but I have no idea where to begin. I’m assuming that the issue is something under the playfield possibly? Please help, and thanks in advance!