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Unread 03-24-2010, 07:38 PM   #1
Not Yet Wild
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Default Fried Component on Curtis Logic Board -- Help ID?

Hello,

I accidentally sent a full 48V to the "pedal high" pin #1 on my Curtis 1510A-5250. I fried a component and its neighbor. Can anyone help me identify it so I can make an attempt at replacing it? Image below.



I think it's a resistor?



Jesse.
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Unread 03-24-2010, 08:08 PM   #2
Not Yet Wild
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Default Re: Fried Component on Curtis Logic Board -- Help ID?

Im sorry to say, But i dont think you should try and replace the resistor. I would try to get Curtis to fix the controller for you.

When you look at the controller it might just look like its those 2 parts that are fired, but in reality, It will be much more. Any 5V part on that board that shared a ground with where you have the negative side of the 48V to will be damaged.

Where did you have the 48V connections hooked to?

Again, Sorry to be the bearer of bad news.

-Adam
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Unread 03-24-2010, 08:14 PM   #3
nimda
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Default Re: Fried Component on Curtis Logic Board -- Help ID?

Clean the soot off and maybe you can see it better. From the pic...best I can tell is theres a 2..... As far as the values your going to be SOL unless someone happens to have one open because you can't get the values from Curtis.


I only see 1 component fried unless its just gone. R69 is probly fine if thats what your talking about. If you can't find the value you can look at similar ones on the board and use those. It's not ideal but I've had good luck doing that. (more times than I can count)


Look at the upper middle...R93, R56 and R72...that layout looks identical to the one that burnt. Measure those and see if the values match with whats not burnt.



As adam said...very well could be more stuff fried...but trying its not going to hurt...not near as bad as having it fixed or buying a new one.
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Unread 03-24-2010, 08:22 PM   #4
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Default Re: Fried Component on Curtis Logic Board -- Help ID?

Jesse,

Sorry to sound so negative in that other post.

IF you can read the numbers on R72, That is the value you need to get. It looks like it will be a 805 or 603 size resistor.

If you measure resistor R69, You should get 820 Ohms. the 3 digit code is 821, which would be 82 + one 0 added on the end. So 820.

What is that other resistor?

-Adam
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Unread 03-24-2010, 10:08 PM   #5
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Default Re: Fried Component on Curtis Logic Board -- Help ID?

Adam,

After your first reply I had to go check and make sure I had posted in the *Extreme* forum! So, thank you for coming back with your super-helpful second reply. R72 is a 332, so it's rated at 3,300 ohms and buzzes out close to that. I'm off to find a replacement. The accident happened because I was bench testing the controller and found that it would only connect to the diagnostic software if I applied voltage to pin 1 (which goes to the 4.65V at pedal up lead on the MCOR). Maybe this is a safety thing -- like you can't do a diagnostic unless the pedal is fully up? -- I don't know. This was fine when I was testing with two 9V batteries and 17V total. But, most features wouldn't register at that low voltage, and when I went up to five batteries and 45V, it didn't occur to me that this would be way over what pin 1 would be able to take. Of course, it makes sense after the fact. For a moment, everything worked; then nothing worked. So, to answer your question, the errant 48V ran from pin 1 to the B- tab on the controller. There's a lot between the one and the other, but I'm still hopeful. What do you think?

Roady,

After I took the photo, I tried to brush the soot off the burned-out resister and it just fell off! Like you said, I figure it's worth a try, even if it turns out other components were damaged. The slightly singed R69 still reads at 808 ohms, so it's well within 5% of it's rating of 820 ohms.

Thank you both for your replies; I'm going to give this a shot and I'll post back with what results.

Best,

Jesse.

Last edited by jfbrink; 03-24-2010 at 10:49 PM.. Reason: forgot something; then removed extra '0'
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Unread 03-24-2010, 10:34 PM   #6
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Default Re: Fried Component on Curtis Logic Board -- Help ID?

Quote:
Originally Posted by jfbrink View Post
R72 is a 332, so it's rated at 3,3000 ohms and buzzes out close to that.
Check this out. http://en.wikipedia.org/wiki/Resistor#SMD_resistors

That should be 3.3K not 33K...Unless you just typed an extra 0, which it looks like. lol

I wish you luck. I look forward to hearing of your progress.

-Adam
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Unread 03-24-2010, 10:50 PM   #7
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Default Re: Fried Component on Curtis Logic Board -- Help ID?

Oops, yeah, that was a typo. Okay, I edited the post to axe that extra zero.

Best,

Jesse.
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