sounds like case #1 to me <grin>
I've seen people who say "replace them all"
I've seen people who say "replace only bad"
As a philosophy, neither is likely right.
Harvey
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On 11/21/2021 8:26 PM, Dave McGuire wrote:
? In the ones I've repaired, every one of those capacitors in that central column have been bad, with no exceptions.? Just FYI.
? Heh, one of them was particularly weird.? The lead *twirled* within the capacitor, as if it were connected to nothing at all inside.? I put it on a bridge, and it read a few pF.? It was supposed to have been 470uF!
????????? -Dave
On 11/21/21 8:21 PM, Harvey White wrote:
There's a philosophical point where you say:
1) these might be bad, I'll replace then all.
2) I'll only replace the ones that I know are bad.
To me, it depends on how difficult it would be to replace, and also what the probability is that all of these could be bad.
Your pick.? I don't think that there's an absolute "this is the right way".
Harvey
On 11/21/2021 6:06 PM, Paul Bicknell wrote:
Hi Tom
Thank you for looking up the part numbers? please look at the xl document I have put onto the HP 70900 folder in the HP 70000 on this site
as I am using it to compare the values of the capacitors measured in and out of CCT on a number of 70900 units
hopefully this might help speed up repairing 70900 in the future
Vladan I have put a number of Vishay spc sheets in the same file along with a list of their suitability? size and availability
Regards Paul
*From:*[email protected] [mailto:[email protected]] *On Behalf Of *tmillermdems
*Sent:* 21 November 2021 22:41
*To:* [email protected]
*Subject:* Re: [HP-Agilent-Keysight-equipment] I'm old 70+, the 70K system is old; good or bad omen?
From the 70900B CLIP:
C32 0180-3068? 470u/12v
C17, C18? 0180-3441? 270u/25v
C52 0180-3443? 560u/7.5v
C43 0180-3068? 470u/12v
C42? 0180-3442? 1200u/12v
AL-ELCTLT
Regards,
Tom
On 11/21/2021 4:34 PM, pianovt via groups.io wrote:
??? Paul,
??? If you (or someone else) can post the HP part numbers for the
??? capacitors, there is a chance that I may be able to find out what
??? ESR specs were used when the module was designed.
??? Vladan
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