Honestly, that is what I find in about 80% of the
repairs I do. A single poorly sourced capacitor
wrecked all orderly operation.
My favorite is the bootstrap capacitor, which is
invariably some cheap piece of Chinese garbage
capacitor in a sea of Nichicon's, or other good
quality capacitors.
-Chuck Harris
David C. Partridge wrote:
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The ripple on the -5V looked really quite high ...
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Nick Corvid
Sent: 23 September 2020 09:29
To: [email protected]
Subject: Re: [TekScopes] Tek 7854 intermittent issues
Not very good at finding things on schematics but I'm fairly sure that the funky looking capacitor is A27C321 I'll have to look through my stuff and see if I have a spare of a decent value on hand. Also if I'm reading things correctly it has to do with the +5 volt rail, but it seems strange that all these issues would be caused by a single sad cap that's kind of out of the way. So I'll keep looking for what is causing these problems in the meantime before I find a replacement and see if that changes anything at all.
