The dreaded 40 error code on a S5500

[Myfairlady]

Hi. I have got an issue with a Bally S5500 board. This board worked perfectly until the battery went low. The owner did not know how to solder a new battery and brought the board to an electronics shop. There, they installed a new battery but I think they overheated where +  was supposed to be soldered and in the end, + was nowhere to be soldered. They consequently bypassed + to Jw12 and It worked fine like this.  As years went by, battery died again , but the owner tried to reset the machine with U12/U15 clear chips. He put them the wrong way and got a 80 code and finally nothing at all in the display.  At that point, I got the board.  I reprogrammed U12,U15, U3,U4 and tested them in a known good board to make sure they were ok. I desoldered the dead battery and realized that the only way to solder minus was to bypass it as well, I chose to bypass it to Jw1...  81 went away , I got a 83 F, which I got rid of with a ram clear. However, Now I got a 40 tilt I cannot clear.  My questions are the following ones: could that come from my bypass to Jw1? If so, where could I bypass minus without damaging anything? What part of the board deals with reels problems?   Last thing I noticed: the board needs chips to be cleared, jumpers must be on Jw10  as well otherwise 83 F won’t go away...   if anyone can help it would really be appreciated.  Thank you

[Sunrise Side]

If you use a battery holder you can connect the negative lead to a screw that holds the board to the tray.

[Myfairlady]

What about the positive ?

[Sunrise Side]

Solder the positive wire to both pins of JW12 , like it was before.

[Sunrise Side]

After you do the clear, be sure the reels finish their calibration dance before you close the door.

[Myfairlady]

Do you the issue might come from my soldering the negative to Jw1?

[Sunrise Side]

I'm not sure. Someone with more knowledge of these boards would know. Like Badbaud or other Bally pro's here on NLG.