(Topic ID: 133725)

Random Reboots - Roller Coaster Tycoon


By Spyderturbo007

4 years ago



Topic Stats

  • 17 posts
  • 4 Pinsiders participating
  • Latest reply 3 years ago by schudel5
  • Topic is favorited by 2 Pinsiders

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-1
#1 4 years ago

A friend of mine has a RCT that's been rebooting randomly. Sometimes he'll turn it on and it will reboot 4 or 5 times. Other times you can play 8 - 10 games before it reboots. There doesn't seem to be any rhyme or reason.

I'm finding a lot of threads with reboot issues related to Williams machines, but nothing relating to Stern. His brother in law has been repairing circuit boards for decades so he has that benefit, but I was hoping to give him a starting point.

#2 4 years ago

Here's what I'd do first.

Look over the I/O driver board connectors. There is one directly above the voltage regulator (J16) that sends +5V to the CPU. That connector tends to get toasty and tarnished from the heat given off from the voltage regulator. If it looks brown, I'd replace it along with the header pins. I've replaced J16 on about 5 games that had reset issues and the reset issues all went away after doing that.

Next I'd reseat all the connectors around the edge of the board. Just in case one is flaky, but J16 tends to be the culprit.

Lastly test the +5V. Set your DMM on DC volts, black lead on ground braid, red lead on the bottom leg of resistor R114. If it reads below 4.9V I'd adjust the voltage up a bit with the potentiometer at R116. I've never had a low voltage issue with any Whitestar game yet. But check anyways and adjust if necessary.

I'll bet you have a bad J16.

3 weeks later
-1
#3 4 years ago

I just wanted to update this thread with the resolution. It turns out it was a fuse.

I'm not sure how a fuse could cause random reboots, but after another guy looked at the boards and followed your instructions schudel5, he suggested that one of the fuses be replaced (I didn't ask my friend which one they replaced). There has probably been a bunch of games on it since then and it's been fine according to my buddy.

#4 4 years ago

Stern reboots are tricky, it will come back. I would say you have a loose chip under the battery holder, or the batteries have started to do the primal oozzz they tend to fail in a way hard to spot on sterns.… when it comes back be ready with the information.

11 months later
#5 3 years ago

Apparently it started again a few months ago. He had is brother in law check out the boards and said they are fine. You can barely get past 1 or 2 balls before it reboots. It will also randomly reboot during attract mode.

He said that his brother in law tested and was getting 5V at R114.

Where do we go next? His brother in law is supposedly an electrical engineer by trade, so I would think he knows what he's doing. Should the boards be sent out to someone that's an expert when it comes to pinball machine boards?

#6 3 years ago

Bump for some help.

#7 3 years ago

Unseat the power connector at the top of the board top and center I want to say it's nine pin it's a big connector if the reset stops then you have carbon buildup only thing I know to do is replace the connector or run a jump I had to run a jump. This is the driver board I speak about by the way

#8 3 years ago

When you say driver board, what does the driver board drive? So unplug it and play the game? Please excuse my ignorance.

#9 3 years ago
Quoted from Spyderturbo007:

When you say driver board, what does the driver board drive? So unplug it and play the game? Please excuse my ignorance.

I think he meant to say reseat (power off, unplug and plug back in) that 15-pin connector at J16. If you unplug the 15-pin connector at the top of the driver board (the larger board at the bottom of the backbox) the game won't do anything. That 15-pin connector at J16 provides 12V and 5V to the CPU board (big board at the top of the backbox). With that unplugged the CPU has no power.

It appears you reseated the connector and it lasted almost a year. This means you need to REPLACE the 15-pin male header and the female connector pins at J16 on the power driver board. I guarantee you this is the issue. 100% of the reset issues I've dealt with on Whitestar games are attributed to that single 15-pin connector. You need to replace BOTH the male header AND female connector pins.

#10 3 years ago
Quoted from schudel5:

I think he meant to say reseat (power off, unplug and plug back in) that 15-pin connector at J16. If you unplug the 15-pin connector at the top of the driver board (the larger board at the bottom of the backbox) the game won't do anything. That 15-pin connector at J16 provides 12V and 5V to the CPU board (big board at the top of the backbox). With that unplugged the CPU has no power.
It appears you reseated the connector and it lasted almost a year. This means you need to REPLACE the 15-pin male header and the female connector pins at J16 on the power driver board. I guarantee you this is the issue. 100% of the reset issues I've dealt with on Whitestar games are attributed to that single 15-pin connector. You need to replace BOTH the male header AND female connector pins.

That's what I was trying to say. Could not find the parts have a link to them I currently have a hack.

#11 3 years ago

I buy this male header and snap it off for the length header you need. Clip off the pin at the key position: https://www.greatplainselectronics.com/proddetail.asp?prod=26-48-1245

Here is the connector housing: https://www.greatplainselectronics.com/products.asp?cat=81 Scroll down to the 15 position one.

Keying plug is on the above page as well.

Here is the female connector: https://www.greatplainselectronics.com/proddetail.asp?prod=08-52-0113&cat=81 You will need at least 14 of them.

#12 3 years ago

Thanks for the part list we actually disagree on the part it's the 9 pin connector I am talking about. That was my issue - however one never knows.

#13 3 years ago
Quoted from coz6:

Thanks for the part list we actually disagree on the part it's the 9 pin connector I am talking about. That was my issue - however one never knows.

The parts are all the same. Just get whatever size connector you are working on. If you are working on the 9-pin that's the GI connector J15 at the top left. The OP was having reset issues and that's the 15-pin J16 at the top center.

#14 3 years ago

This pinwiki has great information that might help you understand this problem and future issues.
http://www.pinwiki.com/wiki/index.php?title=Sega/Stern_White_Star_Repair

#15 3 years ago

Thanks so much for the parts list. Looks like some soldering is required.

He'll have to dig someone up that can do that for him.

#16 3 years ago

Damn. $5 minimum order. I guess I need to find something else to buy.

Is this the crimper I would need?

Part Number: W-HT-1919
Crimper, 0.093" & 0.156"
Crimper, 0.093" & 0.156"
Crimper (Red)
For 0.093" and 0.156" contacts, Wire sizes 24 through 14AWG
Use with the following crimp contacts:
02-09-1104
02-09-1119
02-09-2118
08-03-0304
08-52-0072
08-52-0113
08-50-0134
Manufacturer: Waldom

#17 3 years ago
Quoted from Spyderturbo007:

Thanks so much for the parts list. Looks like some soldering is required.
He'll have to dig someone up that can do that for him.

Soldering is the easy part, desoldering is the hardest part. In order to remove the header, a desoldering station is the best approach but the equipment is pricey. You can do it with a spring loaded sucker too, but it takes a while. The worst thing that can happen when removing headers is pulling the plated through holes out with the header pin. Make sure the solder is good and melted before pulling the pin out of the board.

Quoted from Spyderturbo007:

Is this the crimper I would need?
Part Number: W-HT-1919
Crimper, 0.093" & 0.156"
Crimper, 0.093" & 0.156"
Crimper (Red)

Yes. Just be forewarned, the plastic handle grips SUCK. They tend to slide off during crimping. What I did is pulled them off and bought a can of that rubber dipping stuff and dipped the handles every hour or so until I go the thickness I wanted. Much better. But yeah those are the ones you want. I also have a set of .100" crimpers as well for when you need to work on those smaller connectors.

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