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cap question on a mq 430
Posted: Tue Dec 20, 2011 4:00 pm
by wooferdog
i'm changing the caps on this amp and i see the 4 power supply caps,the 2 rail caps and two more caps next to the rail caps that are 35 volt,do these need changed and what are they for?
Re: cap question on a mq 430
Posted: Tue Dec 20, 2011 7:03 pm
by ttocs
I have them ready to be soldered into my board, just have not done it yet.
Re: cap question on a mq 430
Posted: Wed Dec 21, 2011 3:44 am
by wooferdog
what are those 2 caps for? they have a higher voltage then the rail caps.
Re: cap question on a mq 430
Posted: Thu Dec 22, 2011 3:26 am
by Mr. Wild
What caps do you mean?
Re: cap question on a mq 430
Posted: Thu Dec 22, 2011 3:52 am
by wooferdog
it's the ones with the red and white stickers on them by the rail caps. they are both 470uF 35 volt.
board is rev b
Re: cap question on a mq 430
Posted: Thu Dec 22, 2011 8:58 am
by Eric D
What you have there is a pretty rare (I know I have never seen one) MQ430 with double rail caps. All MS250s are built this way.
You need to replace those as well. The big blue caps can stay.
PG seemed to use smaller caps in this configuration most likely for speed. The little caps react quicker, but the bigger caps hold more energy.
Re: cap question on a mq 430
Posted: Thu Dec 22, 2011 9:07 am
by ttocs
really? Mine is like that as well.
Re: cap question on a mq 430
Posted: Thu Dec 22, 2011 11:57 am
by Nils
Hmmm... Both of mine MQ's also have them. I have one gray and one white.
Re: cap question on a mq 430
Posted: Thu Dec 22, 2011 1:38 pm
by pdelgadinho
Since a bunch of you guys are taking a closer look at your MQ430's, can you let me know the following so I can update the cap replacement spreadsheet I'm working on? Looking for the factory specs, please fill in the question marks or correct any mistakes.
Thanks in advance!!
MQ430
4 Input caps = 16V, 2200uf, 105C, 18mm x 31.5mm, 7.5mm Lead Spacing
2 Rail Caps (the big ones) = ??V, ??uf, 105C, 35mm x 35mm, ?? Lead Spacing
2 Rail Caps (the small ones) = 35V, 470uf, 105C, ??mm x ??mm, ?? Lead Spacing