Leaderboard

Made the brackets to mount ball tracks and playfeild surround is on with inlaid lights to illuminate playfield. Getting wood for cabinet Tuesday and coloured discs for wheels.i can make front of cabinet and measure for glass front then I'm stuck till all my metal bits are done.jjust to add its 8mm pitch chain not 3/8. I've had that many measurements and bits in my head I got mixed up.

OK, this is not unexpected when tracing faults on this board. You need to understand how the RESET circuit works otherwise nothing will make any sense. You won't need a scope at this point (probably later though). A quick overview.... all the supplies are monitored via diodes feeding in to TR10 and/or TR8. You have to find which supply(s) failures are getting through the diodes to cause the RESET to occur. 1st to check is IC2(8212) as this often fails, they aren't cheap either! With these boards I usually change all the transistors TR 8, 9, 10, 11, 12, 47, 48 and some others but more on that when you get it out of RESET. I can't emphasise enough the pins in the PSU socket, if these are contaminated you'll be getting RESET's intermittently all the time!!

Hi Danno, It's amazing after all these years there's still lots to learn about Blackbox! I did manage to make a plug in daughterboard with a 2114 on it just to enable me to run games that needed the memory. A while back I did make some proper RAM boards with coin cells on but they all got bought up and I never made any more. Mind you the RAM chips are now very rare with a price tag to match!

Cheers mate,waiting for my metal work now which might be a couple of weeks,will post as I do more.

I've cut and shaped the wheels,made 48 long pins and just starting the 24 short pins.also started assembling the 8mm pitch drive chain.now measuring for the drive shafts and bearings that mount to playfield. Note the wheels are slightly tapered to help the ball go through lose hole.