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hp8921a

 

hi guys my hp8921a power? supply has failed and i have installed smps power supplies to power it .these are working ok however i have no reception or spectrum anyalser .the original power supply must put out a signal to the micro that shows it to be working because a error of i think? it was power supply fault which the detection line comes from the secvondary ac before the diode.any assistance would be great.
 

Have you included the +40V supply in your set-up.
?
Robert.
 

On Sat, Mar 8, 2025 at 06:12 AM, Robert G8RPI wrote:
Have you included the +40V supply in your set-up.
?
Robert.
?
yes all rails are included 43volt +12 and +5 and +14.4 and -14.3.it powers up diags screen all good but i am wondering the batt monitor and because no signal on it the system has turned the macine off .a error does show?
?
 

smps included
12volt rail ?12V 3A 36W
?5 volt rail 5V 6A 30W
43 volt rail 24V 1A 25W???Quantity 2
+ and - 14volt rails 15V 2A 30W???Quantity 2
 

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Re:-? ".a error does show"

What is the exact error message?

A photo of the screen would be good.

(Cropped and processed to keep the file size sensible.? Saved in a format everyone can see.? .jpg for example.)

Regards.

Dave 'KBV.
 

 

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Thats better, hopefully someone will recognise the issue.

Picture is still a bit fuzzy, though I can easily see the two lines at the top of the screen, the second showing the error.

The other displays, with negative (black) text on a bright background, don't come out too well.

Best Regards.

Dave 'KBV
 

Ian,
?
There's a group for the the HP 892XX series it's /g/HP8924-Family-Spectrum-Analyzers/topics ,? Amtronix supports them & provides help their website is .
The owner is very knowledgeable about them & will answer technical questions.
?
Bill Higdon
?

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