On Sat, 26 Jul 2014 01:47:18 +0100, "Arfa Daily"
wrote:
"Baron" wrote in message
...
Chris B. prodded the keyboard
On Fri, 25 Jul 2014 15:16:16 +0100, Baron
wrote:
Hi Chris,
That is a capacitor and should read O/C on an ohmeter. Lift one end
and re-check. You might find it's OK. In circuit measurements are
not always reliable !
Hi,
Thanks for the reply. I was thinking about it last night and I
figured it has to be C1006 leaking or shorted to ground. I just
took one end off and checked it - 120 ohms DCR.
Its dead ! Bin it.
I also notice it's slightly charred in one spot. So I will replace
it (and I will probably replace C1005 at the same time. My next
question is what to buy to replace it. It's listed as:
CAP, FXD, CER DI : 0.022 uf 20% 50V
Does that mean ceramic disc? I hope I can find one in that style
locally.
Its not a critical component. 0.022 uf is a common value and 50Vw is
typical. Try RS components or Element 14, Mouser there's lots to go
at.
--
Best Regards:
Baron.
Agreed. If it's hanging on the end of that feed resistor to deck, it's just
a decoupling cap, and anything of that sort of general value at that or
above voltage rating that will fit in the board, will be just fine. For test
purposes, you can run the 'scope quite happily with that cap just removed.
Most small-value rail decouplers like that one are only there for 'belt and
braces' purposes on properly designed circuitry.
Hello,
After reading your post I ran it with the cap still floating at one
end: 0.1 v across the resistor, +7.5 volts at pin 7 of the IC.
Interesting that it didn't mind being fed with less than +3v.
So presumably the cap failed and caused the resistor to char. Here's
the thing - the main board power schematic shows 25 or 30 of these
things. The processor board has 20 or so more. Are these things
failure prone or is the fact that these components were covered and
maybe got a little hotter than others likely to be a factor? I'm not
going to replace anything other than these two for now, but I'm
thinking of ordering a bunch of these:
http://www.digikey.ca/product-detail...844-ND/3726082
which is the closest thing I could find.
I have another question, what is the purpose of the 10 ohm resistors?
Is it to limit current if the IC shorts out?
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