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HP 3325A Function Generator crapped out

My HP3325A has moved from "working fine" to "brief flash of the LEDs when the power button is pushed, then all goes dark" - and no indication that things are behaving other than the displays (ie, blind button punching does not get outputs.)

I have the manual and will work though it, but thought I'd ask if there were any common issues that folks were aware of that I should look for first when I go looking. Smells like some sort of power supply failure at first guess, but I have not torn into ANYTHING, yet.

It's too nice (when working) to become a boat anchor.

Thanks!

--
Cats, coffee, chocolate...vices to live by 
Please don't feed the trolls. Killfile and ignore them so they will go away.
Reply to
Ecnerwal
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Power supply would be my first guess. It's been years since I worked on one. Does that generator use Mostek ROMS?

Reply to
JW

It is made by hewlett Packard,, who are only half way good at making scanners. Computers""?? FORget it. Switch brands. Ifyou're a loyal nut, god help you.

MS

Reply to
Lynn

"The wise speak only of what they know, Grima son of Galmod." ;)

HP used to be an instruments company, and built some of the most beautiful, accurate, bulletproof instruments ever seen. I have probably two dozen of them, including two 3325As, both of which need some relays replaced but are otherwise in perfect condition. One of the nicest low-frequency synthesizers ever.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs 
Principal Consultant 
ElectroOptical Innovations LLC 
Optics, Electro-optics, Photonics, Analog Electronics 

160 North State Road #203 
Briarcliff Manor NY 10510 

hobbs at electrooptical dot net 
http://electrooptical.net
Reply to
Phil Hobbs

Not obvious from the manual. I'll have a look when I get under the cover.

--
Cats, coffee, chocolate...vices to live by 
Please don't feed the trolls. Killfile and ignore them so they will go away.
Reply to
Ecnerwal

Any luck, Lawrence?

Cheers

Phil Hobbs

Reply to
Phil Hobbs

So far I haven't cleared the bench to get a look in; I'm moderately slow, especially since the need is not too urgent. Had hopes for the weekend but other things took up the time. I did ferret through the manual and per the flowchart on page 8-31 I'm either looking at power supply or logic (Group O or Group A) since the fan does start, but the display (after that brief flash) is blank. Per figure 8-25 on page 8-22 the blower starting means the 5 v (unreg) supply is up though I'm having a time trying to find that on the full schematic.

I also need to find my paper copy of the manual as the PDF is rather annoying to use. This one I do have a paper copy (in hiding), the 5334A I only have a PDF.

--
Cats, coffee, chocolate...vices to live by 
Please don't feed the trolls. Killfile and ignore them so they will go away.
Reply to
Ecnerwal

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