Hello Folks! I'm having a problem trying to get all the feature lamps working on my Baby Pac-man. I'm stumped on this one. I tested all the lamp outputs on the lamp driver board (J1, J2, or J3) and they are all good. Replaced all the SCRs that won't light with MCR106-6.. all the same lamps still don't light.(I can short the lower leg to ground and both lamps will light that are controlled by that SCR) I've socketed and replaced the U1 and U2 4514 Decoder chips. I repinned J4 on the lamp/solonoid Combo driver board. All the connectors on the MPU are repinned and replaced. Wondering if the problem is on the MPU and not the lamp driver board.
When I first got it, all the feature lamps were working. I can't figure out what may have changed that would affect it since then.
This video link is showing how it is currently working with the missing lamps.

Any Ideas for help would be great!
Thanks

I've checked those fuses. I don't think it's a playfield issue. There's power going to all the feature lamps. And I can get them to light up by grounding the lower leg of the SCR that controls each lamp. I've also done the light test that's described here https://www.pinwiki.com/wiki/index.php?title=Bally/Stern#Testing_Lamp_Driver_SCRs

Plus since I changed out the decoder chips at U1 and U2, I'm thinking the signal is getting hung up somewhere before the lamp/ solonoid driver board..
I also changed the video to unlisted instead of private, so if you could let me know if you can view it now, that would be awesome.
Thanks

I was thinking along those lines, and after you said it, I swapped the chips. Same outcome. I had an extra 6821 lying around so I put that in. I also swapped the same chip from U7 on the vidiot board. Still the same outcome. I made a diagram of the non-working lamps and their respective SCRs. Everything hi-lighted is a non working lamp with the exception of the middle arrows which seem to be on but extremely dim.

IMG_9830 (resized).jpg

Thanks for all your help! Using my logic probe, I found that even though I re-pinned all of J1 on the MPU, pin 14 for AD1 must not have been fully pushed in. After pushing the pin in with the probe, I got a reading with a pulse! Looked at the playfield and saw the other half of the feature lamps flashing! As for the left spinner arrow, the lamp socket was kind of mangled. Most likely bc the location is in a very tight spot. I fiddled with the lamp socket and replaced the diode. Then noticed that tunnel "L" wasn't working as well. So I replaced Q4 on the lamp driver board and low and behold... all of the feature lamps are working as they should!
Thank You