Re: Help Troubleshooting 466, No +15VDC


Vince Vielhaber
 

I've done that ... once. I had a main board for a Radio Shack Model III computer with ONE shorted 0.1uf bypass cap out of about 50 or so. 5V at 10 amps cleared it in less than a second.

Vince.

On 09/10/2020 02:16 AM, Stephen Hanselman wrote:
Actually my partner used that procedure regularly, I think it’s a bit drastic but he swears by it.

Regards,

Stephen Hanselman
Datagate Systems, LLC
On Sep 9, 2020, at 20:50, Jim Ford <james.ford@...> wrote:

Maybe it does for shorted tantalum capacitors. Not guaranteed to work on shorts inside the PCB. Oh, it will show you where the short is alright, but that doesn't mean the short will clear or the PCB will be usable afterward. Don't ask....

Jim Ford

------ Original Message ------
From: "Stephen Hanselman" <kc4sw.io@...>
To: TekScopes@groups.io
Sent: 9/9/2020 3:18:34 PM
Subject: Re: [TekScopes] Help Troubleshooting 466, No +15VDC

Our favorite way was to use a HP 2100 power supply 5VDC at 50Amps. Finds’um every time

Regards,

Stephen Hanselman
Datagate Systems, LLC
On Sep 9, 2020, at 07:00, Martin <@musaeum> wrote:
Hello Sparky,

my preferred method for instant finding of shorts in these caps is with my IR-Cam.
You may supply the +15V rail with a current limited supply, or shortly apply mains power - the component will instantly reveal itself.

IR-cams are getting more and more accessible, perhaps you can borrow one?

cheers
Martin





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