Re: Hello from new member w 2465A issues

 

The OEM caps C1016 and C1018 are made of metalized paper with plastic cases.  The cases eventually crack and become susceptible to moisture intrusion which permeates the paper, creates leakage, which creates heat.  My guess is the scope was recently submitted to high humidity without being powered.  Once power was applied both of the old caps heated rapidly and failed explosively.
The modern solution is to use plastic film caps of similar ratings.  The modern plastics are less likely to crack and if it does, the plastic film is not so susceptible to moisture intrusion.  My advice is to always replace these caps as part of the "recapping" of  24X5 series scopes. 


From: "armin.schon@... [TekScopes]" <TekScopes@...>
To: TekScopes@...
Sent: Tuesday, January 26, 2016 11:48 AM
Subject: [TekScopes] Re: Hello from new member w 2465A issues

  After confirming that C1016 and C018 have blown up I wonder why they would fail within seconds of each other. Is that to be expected they way this circuit works, or does it point to the failure of another component, which cause the caps to blow out?



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