TerryMasters
Member
Hey everyone. Well, I've been in this situation now for about a year, and I've never got around to doing anything about it until now. Here's the story. I have a dedicated MK1 machine, with MK revision 4.0 in it. When I first got the machine, it kept resetting every 5 seconds or so, looping the burn-in test. I checked the 5v rail and found it near 4, so I upped it (accidentally) to 6. Once I discovered how high it was set, I lowered it back down to 5v. I thought that solved the problem, as the board made it passed the burn in test just fine and played as such for quite a while. Then I noticed something strange - no matter what the volume pot is set to, the audio fades in and out - sometimes being damn near completely silent, sometimes being way louder than it should be. For the most part if I keep the pot low, the volume only varies minimally. That's not the main problem, however. I just wanted to state that as how this whole mess began.
The main problem, is that the machine finds itself back at the burn in test after about an hour or so. It'll just restart out of nowhere, and then appear to be fine. A half an hour later, it will reboot once more. Fifteen minutes later, another reboot. Then it does something really strange - it sends what appears to be a black screen with no sync to the monitor. Turning the machine on and off usually fixes it, but it's only a matter of time before it starts resetting again.
Now what makes this particularly strange, is that I've replaced damn near everything there is to replace. The monitor itself is fine, shockingly mint for a K7000, so that's all good to go. I figured it might be the power supply, so I replaced that - it still reset. Then I figured the board was toast, so I replaced that with another revision 4.0 - it still resets. The only thing I didn't replace was sound board, as the extra one I had didn't output any sound for whatever reason (yes, the volume pot was fine). This is where I stand, completely stumped. If it's not the monitor, not the power supply, and not the game board... what else could it possibly be? The only two conclusions I can come to are as follows:
1.) Both 4.0 boards were toast. Why would the seller have had two of the same boards in the first place if something wasn't wrong with one of them?
or
2.) The sound board is somehow causing the entire machine to reboot. I can't even begin to fathom how something like this is possible, but I've seen stranger things.
What do you guys think it could be? I'm moving around a bunch of my machines in my game room, so I figured now's a good time to ask. I want to update to a revision 5.0 board, but I don't want to stick a nice new board in there if this thing's just going to kill it.
Thanks everyone!
-Terry
The main problem, is that the machine finds itself back at the burn in test after about an hour or so. It'll just restart out of nowhere, and then appear to be fine. A half an hour later, it will reboot once more. Fifteen minutes later, another reboot. Then it does something really strange - it sends what appears to be a black screen with no sync to the monitor. Turning the machine on and off usually fixes it, but it's only a matter of time before it starts resetting again.
Now what makes this particularly strange, is that I've replaced damn near everything there is to replace. The monitor itself is fine, shockingly mint for a K7000, so that's all good to go. I figured it might be the power supply, so I replaced that - it still reset. Then I figured the board was toast, so I replaced that with another revision 4.0 - it still resets. The only thing I didn't replace was sound board, as the extra one I had didn't output any sound for whatever reason (yes, the volume pot was fine). This is where I stand, completely stumped. If it's not the monitor, not the power supply, and not the game board... what else could it possibly be? The only two conclusions I can come to are as follows:
1.) Both 4.0 boards were toast. Why would the seller have had two of the same boards in the first place if something wasn't wrong with one of them?
or
2.) The sound board is somehow causing the entire machine to reboot. I can't even begin to fathom how something like this is possible, but I've seen stranger things.
What do you guys think it could be? I'm moving around a bunch of my machines in my game room, so I figured now's a good time to ask. I want to update to a revision 5.0 board, but I don't want to stick a nice new board in there if this thing's just going to kill it.
Thanks everyone!
-Terry