Hello All,

I have a Cleopatra SS that I am working on and I am running into a display problem which seems to be power related.

Following the steps on the pinrepair site (http://www.pinrepair.com/sys1/index.htm) I have checked the power levels on the power supply board and discovered that my 60 and 42 volt connections are low. The 60 is reading at 43.8 and the 42 is reading at 25. The top power connector, to the CPU (5 and 12), is good and reading right where they need to be. The issue is limited to the 60 and 42 volts on the side connection.

I tested the power cable (A2J1 I believe) that feeds the power supply board and the problem exists at that point, which takes the power supply board itself out of the equation as the source of the problem. I don’t think there is anything else between the small transformer and the power supply board that can cause a problem.

If that is true then it means that my small transformer (B-17921) is no good. I have looked for a replacement and I cannot find one available anywhere. Does anyone know if a system 80 transformer will work in a system 1? I saw a small transformer from a Counterforce machine (#B19548) for sale but I don’t know if it will work as a replacement for the small transformer that originally came with Cleopatra (B-17921) as I cannot find a schematic for Counterforce to see how the power pins out.

Is there another suitable replacement transformer that I can put in its place to try and correct the power issue?

Thanks!

Would running a third transformer inside the cabinet be an issue? I bought the owner’s manual for counterforce to find the correct 60v windings and I was thinking I could install it into the cabinet and hook up the 60v only and see if it corrected my display problem. But will a third transformer installed be a problem?

All of this is based on the Counterforce transformer being good of course.

haha - I am in the same boat. I reread it three times thinking I was missing something but I am just missing the point cro_pinman is getting at.

I checked the power at points coming off the power board (per the video on pinrepair) and once I saw it was low I verified the voltage coming into the board on the cable that feeds it. the cable feeding the power board is the same as what is coming off (42 for 60v, 26 for 42v). So this is why I am looking to replace the transformer.

I understand measuring voltage directly off the transformer for everything but the 69v rail. For everything else it is using the common ground on the transformer + 1 winding of the given voltage. But the 69v line uses two windings across the back of the transformer, how do you measure that?

It is reading 43.8 volts.

Sorry for the delay in getting back to the project and back to all of you on my progress. I greatly appreciate all the help you have offered up! After the feedback here I re-measured all the touch points on the power supply board (using the guide on pinrepair) and confirmed my original findings which showed me that the 60v and 42v lines were low.

I proceeded to add in the other small transformer (B-19548) and connect the 69v lines only. Now when I measured on the power board I am now getting the right voltages all the way across (+5, -12, 60, 42). YEAH!

But when I turned on the power I realized that I am getting a solenoid locking on (the ball eject to the shooting lane). I have not hooked up the MPU or driver board to the power source yet at this point so this solenoid is either being fed from the general illumination (which I didn't think any solenoid is), the solenoid has gone bad, or I am missing something?? Once I realized it was locked on I shut the game off immediately before it burned up. It was on for a minute while I checked voltages on the power supply.

Again, at this point I have the right voltages, I have not connected anything to the power supply board, and I have a solenoid locking on when I turn the machine on. Is the assumption that the solenoid has gone bad? Any other thoughts?

Thank you for all the help!

Update: It looks like I measured wrong yesterday on the voltage. This morning I pulled the 25v solenoid fuse and turned the game on (with the two out plugs from the power supply board unhooked, and when I measured across the top connector I saw that the 5v is fine but there was no -12v activity.

I have a different power supply board I am going to test with but where does the -12 come from? Any thoughts on what I should look at? Could this be the solenoid issue?

I feel like I am getting very close...

ug, I am at a loss at this point, I think I have just reached a knowledge limit. I am not sure what to look to troubleshoot my two issues, which could be related for all I know.

Issue 1: My out hole solenoid locks on when I turn on the game. I have physically unconnected everything from the power supply and it still locks on. Could it be the solenoid or diode on the solenoid? Could this be the result of a bad rectifier or transformer? I am not sure where to look.

Issue 2: I am not getting any reading on the -12 volt line on the power supply. I pulled the 25v solenoid fuse out of the bottom panel so I didn't burn out the solenoid in issue 1 above and plugged in the input line to the power supply. When I tested the top connecter I saw that my two 5v lines were fine but I could not get a reading on the -12v line.

I went from thinking I am close to feeling like I am getting further into the abyss on this one. I appreciate any suggestions you may have.