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He is active on some boards I frequent. I sent him a message. Hopefully he responds. Regards

This supply uses SCR pre regulation on T801 Do you have DC on the outputs of the two bridge rectifiers? [email protected]> wrote:

Yes, I did find that page also when googling but could not find a way to get in touch with the guy that has the same board as I do, that's why I decided to ask here for help. Maybe someone has a

HI Vladan… Thanks for that. I’ll give the external PS a try. Sent: Sunday, November 28, 2021 9:15 PM To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] 8753ES

Tom, I don't remember any more what the wire loop (jumper) was used for. I think it had something to do with the output amplifier for the 3-6 GHz band. Cutting it may increase the supply voltage to

Preparation for repl acement of the electrolytics requires removal of old and pad cleanup. The following is a picture of PS board with caps removed and traces cleaned ready for replacement.

Update… Have not been able to easily remove the 10 uF Tantalum from the board to see if it is shorted, but have another idea. As I have both a 3 GHz and 6 GHz source module (the 3 GHz is also

"On here". It sounds like you're looking at this mailing list as if it's a web forum. It's a mailing list that has a web interface stapled to the side. Life will be much easier for you if you use it

how do you get to your private mails on here?,i see no way to do it.

Yes sir.? I set that up in the default configuration according to the manual.? Thanks for taking an interest.? I'll need plenty of help

Yes joe i got it fine,im trying to use a pc atx psu at the moment,we will see how it goes,if no good i will concentrate on fixing the hp psu.

Did you check all the jumpers/strapping on the rear panel? Manual 06286-900001,, page 3-1, figure 3-2 shows the standard configuration. Without these, you won't have output. [email protected]> wrote:

Paul, Just did. Let me know if you get it. Joe Sent: Sunday, November 28, 2021 2:14 AM To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] kp54503a psu sub cheers

Good Morning, The reference circuit voltage checks out with the manual and show stable voltage

cheers joe but i cant seem to get my pm's,can you send to my email,its quadzillatech@...,cheers Paul.

I could not find the schematics but found a forum with reference to the three relay board. https://www.electronicspoint.com/forums/threads/hp-8903a-audio-analyzer-schematic.230344/ Regards

Paul, I just sent you a PM with several attachments covering the 54503 PSU. Hope this helps. Good luck. Joe Sent: Saturday, November 27, 2021 7:07 PM To: [email protected]

Hello all, I’m trying to repair an old HP 8903A and found there is a problem in the A6 board. The thing is, my A6 board has 3 relays on it while all service manuals I found have a completely

Hi all i have a hp54503A scope with a dead psu,has anyone subbed one of these with a pc atx psu ?,as they seem to have most of the voltages required,cheers Paul.

Thanks Michael, I'll spin through the that again tomorrow and see what? can see.? I didn't come across anything on my first go round