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Re: HP-8753E Power Cycles at Start Up

 

Thanks Dan; this problem is happening on an 8753B and an 8753E with old capacitors.
What you experienced is exactly why I don't want to replace the capacitors without a reason. The last thing I need is a second fault.
We suspect something like what you describe but cannot figure what would trip it intermittently.
I just heated the protection circuit then (gently) sprayed it with freeze spray. I also gently moved the 10/220 switch in case it was intermittent.?
It is difficult when I cannot get it to quit again.
Peter

On Mon, Aug 29, 2022 at 5:36 PM Daniel Nelson via <djn=[email protected]> wrote:
Re: Power Supply for 8753E

Peter:

Take a look at the + and - 15V supplies. If the filter cap there draws too much peak current during cycle peaks, the current limit shuts down the supply. I found this when putting in new capacitors and the 'better one' I put in with lower ESR casued this.?

So, do check the voltage drop with a scope on the current limit resistors.....


Dan in Chandler, AZ
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