Hello pinsiders!! So last night my wife and I are enjoying a few adult beverages playing my new black hole and she starts acting up (the game that is)! When I hit the start button the ball wouldn’t load into the shooter lane and the displays would go blank right after I hear a click under the playfield. I checked all the switches and found nothing. So today I finally bring myself to upgrade the power supply, finish ground mods, update pop bumper boards and do the pull up resistor mod. Hoping to slove my problem. So I pull the power supply board out, pull the heat sink, replace r10,r3, cr7,with parts from gerbers upgrade kit, I also grounded c1 cap to the heat sink and ran a jumper on the back side of the board from ground to the heat sink mounting screw! I put her all back together and plug in the j1 conn and turn it on and Snap the f 2 fuse pops! I had the same issue a week ago but instead of replacing components I just grounded the c1 neg side cap but when I unhooked the c1
Cap ground the fuse wouldn’t blow and the game would work fine. So I unhooked all the ground mods I did this morn and now I’m not getting 5 volts at tp4 it’s at 1.9vdc. So I tried adjusting the trim pot to get 5 volts and I’m getting no voltage change. I can’t figure out why when I hook up c1 to heat sink for ground and do the jumper on The back of the board it pops fuse f2? I assume my pot is bad and that’s why I’m not getting my 5 v adjustment. This is my first gottlieb and I understand they are different than my bally and Williams games. I guess I’m glad that I enjoy working on them as much if not more than playing them but I definitely want to make this thing bullet proof and don’t want to worry about if it’s gonna work or not for the day. Any help would be appreciated!!!!

Actually I did not. Am I missing something?

I’m starting to agree with ya. I was under the assumption that black hole was a system 80 not 80b. I’ve done some board work and I am by far no pro but I get it done eventually. I know these are temperamental games but I love the game play just as much as I love working on them. I’ve got a pine wood derby with my son today so I’ll have to time to research this more later. If you think of anything I’m missing I would really appreciate the help. I’m half tempted to grab another power supply board that is already done with the upgrades but I’ve been in maintenance for 25 years and my brain isn’t wired that way. If I do go that route do you have any recommendations on with brand is better?

I thought so quench. I did manage to find my 5 v issue I reflowed
The trim pot and had a bad solder joint now I have 5 volts and the game boots and plays again! Which is great. Just gotta figure out why when I do the power supply ground mod it keeps blowing my f2 fuse. More trouble shooting after the pine wood derby.

MarAlb I though that myself
So I checked from the heat sink to both pins of the transistor with my meter and got a quick beep then nothin on each.

Good morning gentleman! Once again my pin is down! The ground
Mod that is blowing my f2 is a wire from the top side(neg lead
Of cap c1) to the heat sink mounting screw right below it. Shown by the arrows. Does anybody think my incomplete
Ground mods would be causing my current issue? Same as before when I push the credit button when the machine is in attract mode the game displays go blank I get a click under the playfield and no ball is served to the shooter lane. After a min or so the displays come on and pressing the credit button does the same thing. Yesterday reseating all the connectors in the back box seemed to fix the issue temporarily. I’m thinkn a bad connection some where but not sure. The worst part is I put probably 30 games on it before this starts to happen.

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I wanted to give an update! My bh is alive once again! I did all ground mods, replaced the power supply with a new rotten dog, repinned the interconnect cable between the mpu and driver board, I also repinned the cable between the power supply and mpu! Seems
to be working great now! Bh is the hardest machine I’ve ever played by far, just got my first multiball lastnight and a score of 500000! I haven’t done the pull up resistor mod yet still doing my research on that! Thanks for the info everyone!!! Here’s a pic of her all lit up. I added 4 green spots to brighten her Up a bit. No sure if I like the green but it will do for now Any opinions?

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Yea I agree with you the green has got to go! My 10 year old son talked me into it. I wish they made a 4 plus 1 led with color on the 4 sides and the top led white as to not wash out the plastic colors. Maybe something to try I’ve got enough to sacrifice a few for the cause.