i purchased a universal slot machine last Saturday. Upon plugging in nothing happened except lights. I read all the notes in this forum. About the power supply. With the different voltages the main one 5 Vic constant to the motherboard to fire up. All my voltages checked out ok. So I went to my motherboard. I looked at it under a magnifier. For about half hour.did not find anything plugged it back in after cleaning the contacts. Still nothing even with black button reset powering up, still no luck so out came mother again. I took out the main chip with the orange sticker on to my findings one of the legs was broken. Also a cold solder joint on the green wire going to a chip. I drilled a hole to poke wire through to its proper connection and re soldered the green wire I plugged it in and lit lived again. But no sound and no handle pull. But worked fine with buttons. So out came the sound chip looked fine. Plugged back in. So out came the reels to gain access to the sound board. In my findings after getting access I found that the amp chip had four legs that were lose. Re soldered them and now there was sound. After investigating the handle I notices 3 sensors on the handle mech. The one underneath the reels towards back where it hits rubber pad with spring was stuck on a screw. But that was not the problem I checked the relay power it was 12 v siting then once coin was inserted it went to 24 v but was not energising. Took it out cleaned it and it was working but it had to be adjusted correctly for all the sensors to work in order. So the machine is 100% working no error codes. Thanks to all your post and reading over all the input from everyone I figured this machine out thanks guys could not have figured it out without these forums cheers I'll post some pics .