(Topic ID: 250293)

WhiteStar Power Board issue.


By vbobrusev

23 days ago



Topic Stats

  • 20 posts
  • 5 Pinsiders participating
  • Latest reply 2 days ago by vireland
  • Topic is favorited by 1 Pinsider

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NASCAR_sb166.pdf (PDF preview)

#1 23 days ago

Hi! So, i trying to find solution on forum but didnt find any topics which can helps me. I have Grand Prix/NASCAR pinball which have issue with coil Q5. Before this it have issue with coil Q1, but it was issue with U1 Chip, i changed U1 it and Q1 works fine. But, Coil Q5 still keep blowing fuse and burn transistor Q5. I change capacitor near transistor Q5 and put new transistor on Q5, it works fine few times. i turn on and turn off machine. It works fine few days, but when i come back next day, fuse blows again and transistor burn also. I think maybe issue was with coil. i swap the coil and it works little bit and again same result, fuse is blowing, transistor burning. Any advices what it can be?

#2 22 days ago

Bad pia.

#3 22 days ago

What is it pia?

#4 22 days ago

still looking solution...

#6 21 days ago

This board doesn't have a PIA.
Are you sure the coil has a diode installed with correct orientation ?

#7 21 days ago
Quoted from zaza:

This board doesn't have a PIA.
Are you sure the coil has a diode installed with correct orientation ?

Yes your right no pia's, sorry.
Can't think anything else than wrong side diode.
Maybe Wrong diode (to low) because it works for a few times.

#8 21 days ago
Quoted from pinballwil:

Yes your right no pia's, sorry.
Can't think anything else than wrong side diode.
Maybe Wrong diode (to low) because it works for a few times.

I changed old coil on brand new coil. Not sure that’s diode issue. Any other ideas what I should to check?

#10 13 days ago

Press all ic's with a socket.
You hear them make a craking sound.
Some times thats the problem.

#11 13 days ago

When you put in new coil, was the transistor changed at the same time?

#12 12 days ago
Quoted from chad:

When you put in new coil, was the transistor changed at the same time?

yes

#13 12 days ago
Quoted from vbobrusev:

Hi! So, i trying to find solution on forum but didnt find any topics which can helps me. I have Grand Prix/NASCAR pinball which have issue with coil Q5. Before this it have issue with coil Q1, but it was issue with U1 Chip, i changed U1 it and Q1 works fine. But, Coil Q5 still keep blowing fuse and burn transistor Q5. I change capacitor near transistor Q5 and put new transistor on Q5, it works fine few times. i turn on and turn off machine. It works fine few days, but when i come back next day, fuse blows again and transistor burn also. I think maybe issue was with coil. i swap the coil and it works little bit and again same result, fuse is blowing, transistor burning. Any advices what it can be?

First, calling the coil you're having problems with by name (ie "Garage Release coil") is much more helpful than only referring to it by the transistor it's hooked to (ie Q5). I had to pull out a manual just to see what coil you were even talking about.

Now, that said. Check the area around the garage assembly under the PF. This is for the garage release, and if I remember right, there's a paper (plastic?) shield there that can get old and come off (but that might have been on the Q6 upkick coil, I can't remember). If it does, the motion of the garage causes the coil lugs to come in contact with metal and it blows the transistor.

If you can't make a shield to replace the broken/missing one, you can also unsolder the coil wires and put plastic tubing over the connection points on the coil there to help keep them from shorting to metal.

If this doesn't work, post a clear hi-res (change the dropdown menu to high-res before dragging and dropping) picture of your garage assembly from a number of sides so we can see if something jumps out as wrong.

Also, make sure you have the final ROM release because there's a problem with the trough up-kicker on older roms where it can burn out the coil and make Q1 blow. Since it was blown before, it's likely you have an older ROM that needs to be updated. If you do have older code and do not update it, the trough coil and Q1 will eventually fail prematurely again. I've attached the service bulletin that addresses this.

NASCAR_sb166.pdf

#14 11 days ago
Quoted from vireland:

First, calling the coil you're having problems with by name (ie "Garage Release coil") is much more helpful than only referring to it by the transistor it's hooked to (ie Q5). I had to pull out a manual just to see what coil you were even talking about.
Now, that said. Check the area around the garage assembly under the PF. This is for the garage release, and if I remember right, there's a paper (plastic?) shield there that can get old and come off (but that might have been on the Q6 upkick coil, I can't remember). If it does, the motion of the garage causes the coil lugs to come in contact with metal and it blows the transistor.
If you can't make a shield to replace the broken/missing one, you can also unsolder the coil wires and put plastic tubing over the connection points on the coil there to help keep them from shorting to metal.
If this doesn't work, post a clear hi-res (change the dropdown menu to high-res before dragging and dropping) picture of your garage assembly from a number of sides so we can see if something jumps out as wrong.
Also, make sure you have the final ROM release because there's a problem with the trough up-kicker on older roms where it can burn out the coil and make Q1 blow. Since it was blown before, it's likely you have an older ROM that needs to be updated. If you do have older code and do not update it, the trough coil and Q1 will eventually fail prematurely again. I've attached the service bulletin that addresses this.
[quoted image]

Thank you, i will check it and let you know.

#15 8 days ago

Firmware was updated to 4.5, i change transistor again, and put fast blow fuse. at first time it blows immediately when coil fired. I put new fuse ang go to Portals menu, for check only this coil. i fired by this coil 5 times, first 4 was normal. on 5th fuse blows again. Any ideas?
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#16 8 days ago
Quoted from vbobrusev:

Firmware was updated to 4.5, i change transistor again, and put fast blow fuse. at first time it blows immediately when coil fired. I put new fuse ang go to Portals menu, for check only this coil. i fired by this coil 5 times, first 4 was normal. on 5th fuse blows again. Any ideas?
[quoted image][quoted image][quoted image][quoted image]

It requires a SLOW BLOW (timed) fuse. Fast blow is wrong.

#17 2 days ago

same result with slow blow fuses

#18 2 days ago
Quoted from vbobrusev:

same result with slow blow fuses

What transistor part number did you use to fix Q5?

Also, have you checked the wires on the coils for a short by following them back and seeing if there's any point where a screw or something penetrates the wire?

#19 2 days ago
Quoted from vireland:What transistor part number did you use to fix Q5?
Also, have you checked the wires on the coils for a short by following them back and seeing if there's any point where a screw or something penetrates the wire?

Same as in manual.

How i can find this place? i put tape on place where coils soldered.

#20 2 days ago
Quoted from vbobrusev:

Same as in manual.
How i can find this place? i put tape on place where coils soldered.

These aren't helpful answers for diagnosing your problem remotely.

What's the full number on the actual transistor you put in the machine? The part number for the transistor in the manual has been out of stock most places (all?) for a long time. You likely got a substitute (is it the RIGHT substitute?) or a fake (especially if you got it off ebay). That's why the ACTUAL number printed ON the transistor is important. What is it?

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