Rush the Rock Alcatraz High Voltage

mongoosetoo

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I've got some other threads on my RTR, but this one is specifically about the power issue I'm experiencing.

When I got the arcade, I saw it was set to 5.47 v. So I dropped it down to 5.25 (manufacturer's recommendation). Now it has trouble booting unless I increase it up to 5.4 or more.

So I called the guy to ask him why he had the voltage so high. He told me he had to increase it to get it to boot. Also told me it's common, but I'm having trouble agreeing with him on that. When a manufacturer says 5.25v, then it's 5.25v. Unless someone can give me a compelling reason why it should be higher.

Is there something I should be checking? Power supply has a bearing going out on the fan so it cries a little bit until it warms up, but it puts out steady voltage. I've only see voltage creep .01 volts over 10 minutes of gameplay.

Three "other things" I should divulge...
1. The power supply is not a factory supply. It's from another random machine, and the guy cut wires and spliced it together to make it work. It is a 200 watt supply though. I plan to replace as I can.
2. The force feedback is currently not working. Fuses are popped but I can still play without it.
3. The monitor is not original - it's an LCD with a converter card. If anything, it should have improved the power situation.

Gurus out there, thanks for thinking about this! I popped a Golden Tee Complete board once taking voltage too high; just don't want to make the same mistake again.

Thanks, m
 
I would try another supply. Also, have you checked the 5V lines for any AC present on it ?

Probably won't be any (at low frequency) due to it being a switcher and all.... but worth a check anyway.

Its almost 10% over voltage. Not sure what the margin is on all of the chips. What is the 5V at the chips ? Maybe something else is pulling it down, or bad connection/etc on the PCB so that when you put the voltage at 5.25, it's under 5.25 at the chips ?
 
Where are you measuring voltage? On the board, or the Jamma connector, or the PS connector?

You will have voltage drop between the two connectors there.
 
Power checking

I've been checking at the Molex connector going into the hard drive - it's convenient.

Will try to get out to the garage and check for AC on the line later today.

Thanks for the tips.
 
I would test voltage at a 5V chip on the board too. Since the molex connector for the HD is right off of the supply, that would probably run a little higher than at the main PCB.... especially if there is any loss due to connection/etc. There may be multiple conductors for 5V (and surely there is for ground) on the edge connector of the mainboard.... if that is the case, maybe one has a break, and that is causing some voltage loss on the main board. ????
 
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