Fixing a dead PCB. Missing T1 from clock circuit on the Video PCB. Parts store - mikesarcade.com Tech Archives - mikesarcade.com/arcade PCB Repair logs - mikesarcade.com/arcade/repairs/ #arcadepcb #pcbrepair #arcaderepair
The typical reasons to glue down a coil are strain relief and vibration resistance. You'll also find that glue in switching power supplies and the like.
Good repair. Well spotted on the missing coil. You have a lot of cool kit. Thoroughly enjoyed the Vid Mike. Greets from England from an Arcade Nut who grew up with these machines taking all my pocket money. 👌👍
Mike, the more videos you make, the more i'll watch!! :D That ECL (10136?) on E1 of the Video board looked like it was missing a heat sink... A friend of mine had their PCB run for a while but would have sprite issues after maybe 15 minutes. We found re-attaching a heat sink seemed to resolve that issue. Have you seen missing heat sinks become a problem once a board is running for a while?
I remember a 486 owner who asked why couldn't i just download a Pentium into his computer. Simple, because you need to pour the magic Pentium seeds all over and water them each day.🤣
Nice video. I was wondering if the chips your mentioned that do timing, if one of them was out would cause the video, sound or CPU to run slower or faster than normal? Or does the whole board follow the same timing?
@@MikesArcadecom Just curious, is it a personal preference, or a fear of it falling off the shelf if its vertical (since its made to stand horizontally), or ??
@@CosmicCleric well, i fix Midway boards too, (Pac & Galaga), which are turned the opposite direction. And Punch-Out's, which are horizontal. The monitor sits back about 3 feet from the front of the bench, and up about the same on the shelf. It's a bit awkward to flip it on its side over the bench. So, i just leave it in it's natural position. A happy medium.
Any reasons why they used ECL RAM for the character and spirit video? I know that ECL RAM is faster but you have to use a different clock frequency and also level shift the logic signals to ECL.
Great question! I believe it was to make things more expensive to bootleg and/or reverse engineer. Or an engineer at Ikegami just loved ecl. They used ECL starting with Radar Scope and used the same basic board design until Popeye & Mario Bros.
The coil drops the frequency of the clock to feed the ecl circuitry. The ecls then chop up the freq further and spit out 3 8MHz ttl level clocks to feed everything else at the 10125 at 1H on the video pcb.
Emulators are close enough for the casual player. However, the sounds are off on all the emulators, and the inputs are not quite right. Finally, if you don't have original controls, it's just not the same.
@@MikesArcadecom Yes there are many coin-op video games that are not very good in emulation, because of the controls: Spy Hunter Paperboy Omega Race Tempest Robotron Defender or Stargate Crazy Climber etc But Donkey Kong (and Junior) play very well on a standard PC keyboard.
