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Positive Cross Current Limit Circuit. Agilent 6611-6613C and 66309D

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I'm trying to locate this Positive Gross Current Limit circuit (Voltage clamp) on an "A1' board that is used in Agilent 66309D, 6611-6613C power supplies. No U# on the block diagram and I probed every diode I could find WRT D321 Anode and I can't find it. I'm pretty sure The ?? voltage clamp is pulling down the control signal at its anode, however I have had no luck finding it on the board.
 

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Look in the area shown.
 

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    Jester

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E-Design,

I should have mentioned that I have the SMT (not through hole) version of the A1 board.

Any chance you have the SMT version?

I'm curious where did you get that document (I have searched high and low)?

Very much appreciated
 

I can't remember where I downloaded it on the web. I only have the old thru hole version sorry.
 
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    Jester

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Is there a document name or number?

Perhaps if I search for the document name I will find it?

Any idea what op amp they used, that might help?

Thanks again.
 

There is an HP part number on the diagram. You could look up the industry equivalent on the web.

I think that I just would have searched for 66312A or HP66312A.
 

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