Re: 7623A power supply low


Brent Watson <brentleew2003@...>
 

From: "very_fuzzy_logic@yahoo.com [TekScopes]" <TekScopes@yahoogroups.com>
To: TekScopes@yahoogroups.com
Sent: Saturday, April 8, 2017 11:57 PM
Subject: Re: [TekScopes] Re: 7623A power supply low

  Brent,

I still think it is worthwhile to pull all the interconnecting power cables and the sense cable. Then each board should be isolated from the others and, with power off, you can check resistance between 5V and ground on each board separately. The culprit board will show as just a couple of ohms or less, measured in both directions of current flow.

C5 has to be a prime candidate for failure, you need to measure DC resistance as well as measuring ESR, you want ESR to be low but DC resistance to be high.

Roger

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