(Topic ID: 264019)

Seystem 7 Power Issue Power Board Black Knight

By McPin54

4 years ago


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  • 19 posts
  • 4 Pinsiders participating
  • Latest reply 4 years ago by McPin54
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#1 4 years ago

Need a some help tonight. I have a Black Knight that I'm trying to get working. MPU locks up and Im blowing solenoid fuse when powering on. I figured I'd start with power coming into the power board. Bridges measure correct. I measured the 15 connector that plugs into the bottom middle of the board. I'm reading 8.4 volts on the orange wires, 34.5 v on the white wire, 53.5 on the other white wire, gray green 11, gray 11.03 and .04v on gray white. I have a picture that might help with what I am talking about. I also measured the 2 GI wires coming in (yellow). I should be getting 6.3 volts on each if Im reading correctly. I am only getting 5.67 on one and .41 on the other. Do I have a bad transformer or where do I start? Any help is much appreciated. Thank you in advance

#2 4 years ago
Quoted from McPin54:

Need a some help tonight. I have a Black Knight that I'm trying to get working. MPU locks up and Im blowing solenoid fuse when powering on. I figured I'd start with power coming into the power board. Bridges measure correct. I measured the 15 connector that plugs into the bottom middle of the board. I'm reading 8.4 volts on the orange wires, 34.5 v on the white wire, 53.5 on the other white wire, gray green 11, gray 11.03 and .04v on gray white. I have a picture that might help with what I am talking about. I also measured the 2 GI wires coming in (yellow). I should be getting 6.3 volts on each if Im reading correctly. I am only getting 5.67 on one and .41 on the other. Do I have a bad transformer or where do I start? Any help is much appreciated. Thank you in advance

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#5 4 years ago
Quoted from gutz:

Transformers put out AC voltages. Make sure your meter is set for AC. For measuring AC, there is no 'ground' and red/black doesn't matter. You need to measure between the wires coming off the transformer. On the yellow to yellow wires, you should have 6.3 vac between the wires, red to red 25 vac, blue to blue 13.5 vac, white to white 90 vac. The only tricky one will be the grey wires since thats a center tap - middle grey wire to either outside grey wire will be 9 vac and 18 vac between the outside grey wires. ALSO, since the transformer isnt under a load, all the voltages will be slightly higher.

Big mistake on my part. Thank you for the help. I was using ground to measure.
Between the two yellow I am getting 6.6
red to red 29.5
blue to blue 14.7
white to white 94.8
grey, one side 11.4 the other 22

everything looks good as you stated, slightly higher.

So, when I plug these into the power board where should my test point be to make sure my power board is good.

THANK YOU FOR THE HELP!!!

#7 4 years ago
Quoted from zacaj:

Sadly there aren't really any test points. Easiest is just to test directly on the output pins. There's a nice diagram of all the voltages on the pins at the beginning of the schematics

I think I have a problem on the Power board somewhere. Here are my readings in pic. Thanks again for all the help.
I have a rottendogg board but I have had little luck with them in Williams systems.
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#9 4 years ago
Quoted from zacaj:

To confirm, you're measuring these as dc? What is your ground?

Yes. I'm using the ground braid and then also used a ground pin on power board to make sure it was consistent.

Thank you!

#11 4 years ago
Quoted from zacaj:

Your 12V and 28V don't seem super weird. Only strange thing is the 5V. Am I understanding right that you're getting 13.9V on the one connector and -13.9 on another?

On my +5v I'm getting same reading on each connector
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#12 4 years ago

My Black input is measuring 5.5v AC

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#14 4 years ago
Quoted from zacaj:

You may have a regulator issue then.. The 5V is regulated down from the 12V, so if your 12V is fine and you're 5V isn't, that implies an issue on the board...
You can also try measuring DC between the two ends of C12, should be the same as the 5V pins and ground braid

Cap C12 is the only one I did not have in stock to replace. I am putting an order together now and will replace that cap.
Thank you for all of your help.

#15 4 years ago
Quoted from zacaj:

You may have a regulator issue then.. The 5V is regulated down from the 12V, so if your 12V is fine and you're 5V isn't, that implies an issue on the board...
You can also try measuring DC between the two ends of C12, should be the same as the 5V pins and ground braid

I replaced Q5, 2N6087 was not available. I used a 2N6059. I now have the proper voltages!!!

Now I have coils locking on! Ugh! Replaced 40 pin and all transistors are good.......need to do some digging.

Thank you

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#17 4 years ago
Quoted from slochar:

Check anything that got the +13 volts it might be blown.

Good call. Thank you. I'll check and report back shortly

But this would have anything to do with my coils locking would it?

Thanks again!

#19 4 years ago
Quoted from slochar:

If the chips that control the coils blew (PIAs would be suspect) yup, sure could. A lot of chips that are TTL compatible can handle 15 or 16 volts.

Perfect. I'll see if I have any on hand, if not I'll order and replace.

Thank you

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