Hello everyone, I am a new member. My name is Chris. I live in york pa. My arcade consists of a Mortal Kombat 2 dedicated cabinet with 6 in 1 switcher installed with all the Mk's (1-4) on it. An area 51/maximum force dedicated cabinet. A sharpshooter in a Dynamo Cabinet. I recently just bought my first pin Bad Girls. I got it for real cheap because it needs some work. I am hoping yall can help me with it.

First I will apologize for my lack of understanding the terminology revolving around pinballs. I am new to all of this and am learning as I go.

The problem initially was, when you turn on the pinball, some of the lights come on but many do not. The speakers would pop and two things underneath the play field made clicking sound. Words on the score screen were jumbled and illegible. I pulled out the main cpu board and found there to be some battery corrosion and several possible broken traces. I desoldered the battery and ran wires to bypass the broken traces on the board. I than tested the board out and much to my suprise, it worked. The display said bad girls and I was able to credit up the game and music started playing. The solenoids that shoot the ball out into the plunger ramp were not working but if I manually placed the ball in the ramp and shot the ball into play everything seemed to be working great. I was a very happy man. Here is a video of it in action when it worked.

I than pulled out the pcb to clean the corrosion off with 50/50 mix of white vinegar and water. I scrubbed it good with a brush. I than reinstalled the pcb and it worked for some time and than started doing this.

I checked all my solder connections and everything seems to be ok. No idea what happened. I can't get it to work now. Any ideas what I can do?

I can't get no readings. I unplugged the J-1 connector where it plugs into the cpu board and hooked a multi meter up to it and grounded the other end. It is showing 0 on all the connections. The socketed chips are dry and so is the board. I used a hair dryer to dry the board on a low heat taking care not to overheat any of the components. I reseated the rom chips. I disconnected the driver board like you said. The only difference that made was the two solenoids that were underneath the playfield that were clicking in tone with the speakers have now stopped clicking. Alls that is happening now is the speaker still pops and the display cuts in and out like it did in the video.

I found this for sale. Would I be able to just buy this and swap out the two rom chips into it and be set? http://www.ksarcade.net/cpus-mpus/gottlieb-system-80b-mpu.html

I will test this tomorrow when I get home and get back to you. The multi meter should be on dc volts right? Do you know of the top two sets of wires are the positive or the negative on the j-1

Yea I saw his videos before. What do you think about what he did? Some people said he was waisting machines that could have been repaired or at least parted out. Others say they are his and he can do as he pleases. Watching his other videos though he seems like a pretty cool guy. I actually thought about stopping by there sometimes as it is about 2 1/2 hours away.

Here is the results of my test. All it does is hum when I touch the probes on the board. Here is the wire connections since someone spliced on a new J-1 connector. Bottom wire is hooked up to the white with blue strip. The one above that is hooked up to a wire that is white with blue strip and the top two wires are hooked up to separate all white wires.

I had the meter set to dc I believe 200. The black probe is in the common spot and the other is in the adc spot on the meter. I wonder if my meter is good or not. Maybe my mulit meter went bad?

Alright when I get home I will put the board back in and try this. I wonder if there is a way to test to see if my multi meter is still good? It is a cheap harbor freight one and the last time I used it, something strange happened. I was testing an arcade game power supply with the game on. As soon as I touched the probes on the power supply the game shut off and wouldn't start for about 3 minutes. Not sure if something shorted out or what

Thanks I will try that with the battery before I use it to test my pin. I will let you guys know what happens when I test off C1

hahaha yea you are right. It's not that I don't trust your information it's just that, I remember when I was a little boy sticking a key in an electrical outlet while my older sister told me chris, don't do it, don't do it. Well I did it, and it hurt and now the only thing that goes into electrical outlets is plugs. HAHA

Yea you were right. I just got home and switched it around. I tested off the C-1 Capacitor. It is showing 4.6 volts

Yes I got a bunch of stuff from one of the members. System 80 in in there and I assume what I will need? Yes I remember reading something where it said to solder a wire to the cpu board and a wire to the sound board and run them somewhere and ground them. Is that what you are talking about?

just checked the voltage at the end of the j1 connector. 4.6-4.7 volts

can I just turn the pot up on the power supply? What should the voltage be around at the j1 connection?

I noticed when I pull either of the slam switches away from the side, the screen say slam switch closed and says that until I let the switch go. Not sure if that helps any or not.

I tried adjusting the voltage up a little on the pot so it is a little over 5 volts. The game still does the same thing.

I am not sure what ground mods to do. I have seen several different versions. Some require soldering wires onto the sound board,power supply cpu and running them underneath and grounding them somewhere. All the power supply's shown do no look like mine. Mine has a heat sink and doesnt look like a bare pcb like theirs does. I am taking my cpu board to have any corrosion left removed and any damaged components replaced. While it is out, I would like to do the ground mods. Can anyone give me a link that shows my particular setup.

I will have to look again. I didn't see anything about the ground mods. It was a bunch of stuff. I only looked at the system 80 file.