Or more likely some crossed wires, but I'd prefer demons. This is long, I apologize.
Background - I have had this Hook since roughly 2005. It has been played very sparingly. For the most part over the years it has played fine but has had intermittent sound issues. Lately the sound had gone away completely. For these reasons it's sat mostly unused, with me thinking I'll get around to it at some point or get it shopped, because I didn't have time to mess with it. Hello pandemic and free time... so I've started to pay attention to it. I ordered a refresher kit, ordered a new lock for the backboard because I didn't have the keys for mine, things like that. While I waited for everything to get here, I began investigating my sound issues on this site... got some tips to check voltages, etc. which my son and I were going to do as soon as we got the backboard open.
Before I started to work on it I moved it from one side of my basement to the other and changed the batteries in the main board, and bam, the sound worked. I figured great, all good. Plus I ordered a Pinsound board, so I figured I'd skip checking for voltages. My son and I replaced the rubber in the front half of the playfield last night and everything worked fine afterwards.
This afternoon he played it and the sound started to cut out again. I didn't worry much about it with the Pinsound on the way. We changed the parts in the plunger mechanism and then lifted the playfield (for the first time, that's probably important) to troubleshoot a weak shooter eject coil/mechanism.
That's when everything went to hell.
In playing a few games to try out the plunger, the machine started to slam tilt. This has never happened before. At first it would do it a few seconds of game play, but eventually it started doing it every time the ball went into the skill shot. Eventually I realized if the ball was shot past the skill shot and went into play, everything would be OK, but putting it into skill shot caused the slam tilt.
I put it into diagnostics and checked the switches in the skill shot. They came back on the display with incorrect readings - one thought it was the center coin switch (something I don't have) and one thought it was either the left coin switch or some switch that wasn't in use. With these readings happening, the slam tilt would happen as soon as the ball hit that area.
However, I found that lifting the playfield seemed to clear the issue temporarily. if I lifted the playfield and set it back down, the skill shot switches would read correctly. But after about five minutes or so of gameplay, it would slam-tilt again. Same cycle - check switches, get the wrong readings, lift the playfield, set it back down, works OK again.
This whole cycle also seems to have some effect on the audio. Sometimes it will work fine, but then randomly a switch in the game will stop the music, the voiceover, or both. It seems to reset itself when the ball ends, but not always.
The only thing that appears to be moving when I lift the playfield is the large wire loom on the right in the picture below. Nothing else appears to be disturbed.
So I'm looking for some opinions on what to do next. Do I lift out the playfield completely and get a good look at that loom? Look at something else?
Thanks in advance.