(Topic ID: 117997)

WPC89 MPU repair

By PhantomAndy

9 years ago



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#1 9 years ago

I've got a MPU that I've been considering repair on. It's the original WPC89 MPU board from my TAF. I'm running a Rottendog board now but would like to get this old board cleaned up and back in business.

Board has battery damage from a leaked battery, affecting some of the switch matrix as usually is the case. The R31 resistor has to be jumpered up due to a lost solder pad from the damage, but otherwise the board looks good.

I'm having one problem - finding the 470pF 50V 20% capacitors (C3 through C10). I can find other types (the type on the board is a ceramic axial type).

Is there a good substitute that anyone has use for board repair - or maybe someone here that has a dozen on hand they wouldn't mind hooking me up with?

Additionally - I need 1 of the B capacitors, rated as a .01uF, 50V, +80, -20%

#3 9 years ago

That's where I was building my order but didn't see them,

#5 9 years ago

I saw the part CCM-470pF-50V but wasn't sure of the size since it's a bit more of a radial versus an axial design. Will that part fit the MPU board?

Additionally, I saw the CCA-0.01uF-100V. Is that part OK to use in place of the .01uF 50V +80, -20% cap that goes in the B locations?

#6 9 years ago

Both those parts will work.

Ed normally stocks a 470pf axial, but it's out of stock.

You can go higher on voltage, it's OK.

#7 9 years ago

Argh!
OK -- no wonder these stopped selling. I have nearly a full reel of the 470pF caps left... will fix the website shortly.

#8 9 years ago

Thanks Ed! Order up in the am

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