shardian
New member
I have an MK2 that is gonna be the death of me. I have 3 boardsets. I'll give the basic rundown of all three.
board 1 - just plain dead. *No memory expansion board
board 2 - Fires up to the test screen, but finds a pile of bad roms on UG and UJ sides - always mated pairs. **Has expansion board
board 3 - Got this as working from another member here, but he was having PSU problems. Nope, he was having CPU problems. The game boots fine most of the time and will play a round or two. Then it craps out and might reboot. Sometimes it doesn't work at all. Adjusting +5 really doesn't do much. The bottom LED (DS3) sometimes flickers or goes all the way out. What exactly does this LED mean? Having sound board attached has no effect. I wasn't getting it to boot at all, then pulled the battery and it booted, but would still crash every minute or two. This board also is very dirty with bent headers and gunk in the little square cpu's.*** No expansion board, and all the video roms are soldered to board...
I have 3 sound boards. One does nothing except for some mild speaker whining, one emits an unholy loud squeal after the 'bong', and the third works fine.
I tried to swap out all the roms from board 1 into board 2, but then it showed every single rom as bad. I tried with and without the expansion board. I've heard people mention a jumper for the expansion board, but I've never seen it mentioned in the manuals and can't find it on the board itself. Can someone kindly point it out to me.
Also, where is a good place to measure +5 at the board? Was it too much to ask Midway to supply test points?
Any help would be appreciated. If there is someone who works on these boards, please point me in that direction. I just want a working dag gone board!!!
board 1 - just plain dead. *No memory expansion board
board 2 - Fires up to the test screen, but finds a pile of bad roms on UG and UJ sides - always mated pairs. **Has expansion board
board 3 - Got this as working from another member here, but he was having PSU problems. Nope, he was having CPU problems. The game boots fine most of the time and will play a round or two. Then it craps out and might reboot. Sometimes it doesn't work at all. Adjusting +5 really doesn't do much. The bottom LED (DS3) sometimes flickers or goes all the way out. What exactly does this LED mean? Having sound board attached has no effect. I wasn't getting it to boot at all, then pulled the battery and it booted, but would still crash every minute or two. This board also is very dirty with bent headers and gunk in the little square cpu's.*** No expansion board, and all the video roms are soldered to board...
I have 3 sound boards. One does nothing except for some mild speaker whining, one emits an unholy loud squeal after the 'bong', and the third works fine.
I tried to swap out all the roms from board 1 into board 2, but then it showed every single rom as bad. I tried with and without the expansion board. I've heard people mention a jumper for the expansion board, but I've never seen it mentioned in the manuals and can't find it on the board itself. Can someone kindly point it out to me.
Also, where is a good place to measure +5 at the board? Was it too much to ask Midway to supply test points?
Any help would be appreciated. If there is someone who works on these boards, please point me in that direction. I just want a working dag gone board!!!
