Adding the other 2 boards from this set..
Board #3 – Spare board for repair
I used this one as a reference while trying to figure out how these worked in general. It had both of the large filter caps missing. I had to order them to get it back to working with AC correctly. The audio amplifiers...
Board #2 - Customer board for repair
Board came in reported with no video.. After getting the minimal bench adapter set up and the power figured out.. plugged it in .. no video.. and no clock to speak of after probing around.
Bad 7437@R9 - no clock - no video. Replaced it.
That is what got...
*** Note: I formatted this on a PC. Not sure how it will show up on a phone ***
A repair shop that I've done some work for asked me if I would take a look at Sprint 2. I've only worked on a few bronze age games. One thing about them is you can see how the golden age games evolved from the...
I used a lot of what is called 'clear penetrating epoxy sealer' in boat building..
Smiths CPES was the brand I used. There are a number of others less expensive on the market now..
It is as thin as water.. seeps into the wood and the solvent evaporates leaving 2 part epoxy molecules behind...
This post has info on it.. (I didn't watch the video... But I've done similar on Star Trek_
https://forums.arcade-museum.com/threads/popeye-roms.513291/#post-4582161
All of those sounds can get killed by a number of things.. I've had trouble with them in this area.. If you swapped the 51xx, 52x and 53xx from your other board and it made no difference - then poking through this part of the board is in order..
Oops.. pay no attention to the Lilypad in the corner... :ROFLMAO:
I keep that printout inside my SW cabinet so I can adjust boards w/o having to go look for the cheat sheet..
I re-read your first post.. I'd start by adjusting X and Y size pots on the game board.
The are generally poorly labeled.. here is a cheat sheet.
Adjust the size first and the CTR (centering) second.. leave the others for now until you get the game back on the screen.
For quick reference - on Star Wars.. There is a blue dot on each corner of the screen during attract mode. You want that blue dot to be in from the corner 1/2 - 1"
@LyonsArcade - I remember watching one of your videos and you said 'this is the most complex EM' - made me want to get one and fix it at the time.. But I can't remember the name.. I know the score reels ticked you off :P