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I would like to thank the group. My HP 8594E is now working correctly. I basically cleaned the attenuator inside contacts with deoxit then checked the attenuator by itself on a bench using a simple

The 7448 is "likely" to work fine, given the circuit you showed in the first post. Install a socket, and try it. Worst case, you have to plug something else in. Pete

Hi Greg, Thanks for the datasheets and Jameco information.? From your mention of the 9307 using active pull-up, I searched for more details on this. While looking thru the Jameco 7447/7448 Family

DB, My last message was rather haphazardly written and didn’t include as much information as I had intended. It was after midnight and I was trying to get some sleep before a 5:00 rise. Looking at

An EEPROM dump would be a great asset, saving much grief in people that lost the 54720 mainframe calibration due to a stinkin' dead battery. The 54717 "calibrator" hardware is just a brain dead pair

I looked for one a couple years ago with no success. They exist in printed form but it appears noone has scanned one yet.

Hi again On electric/electronic tests: I've changed three 2N2222 transistors on A6 rectifier board, one mising (due to transformer hit I presume), one leg broken and one corroded. Diode drops, fuse

My unit has a ton dust and some white and green powder coming out, as you can see in my photos. Nasty but no fatal, only surfaces afected. So, after all, this little fella was lucky. Tony,?definitely

Hi Ruben, Looks like you are doing a great job of bringing it back to life. I can sympathise because I went through more or less the same process a few months ago. I think my 8350B might have been

Hi Runin, Deoxit D5 works extremely well on all electronics, pcb with parts, edge connectors etc. the can is small and a bit pricy. I restored a HP-8663a with a 2 cans from the inside out after

Hi! Some updates and photos for those who are interested: - On the cleaning: finally?I disassembled everything because corrosion?reached many gaps and I found it necessary to sand and brush each

Hi Dave, I once fixed a 5086-7812 second converter with a 5021-8661 board. The only problem on this, was cracked solder joints on the feed through capacitors on the board. So I did not have to open

A rather rare one. Crosses to a industry part number 9307PC (plastic package) or 9307DM (ceramic package). Is currently stocked by Rochester Electronics but they want you to purchase a quantity of

Sorry I rushed that last email. For more relevance the second converter I am talking about is a 5086-7957 and it is low on gain. Dave

Has anyone had any joy repairing on of these. Dave

Is this supposedly a "stock" HP diode or do you suspect it has been repaired B4 with something link a 1n34 or 1n914? Also, is there any kind of DC block in the system (that disk could be a capacitor.

Dave, Interesting... Very simple. Were you able to easily find a replacement for that diode? Does it look like it will be difficult to reassemble properly? (I am thinking in its simplicity,

See /g/HP-Agilent-Keysight-equipment/album?id=272489 My 8471A, diode is fried, (well, I did find it in a dumpster...) working on replacement, will update results when done...

Dave Wright <davewrightsplace@...> updated the album 8471A Internals: Disassembly of 8471A RF detector prior to diode replacement.

Service manual, no schematic: https://xdevs.com/doc/HP_Agilent_Keysight/HP%2054710A%2C%2020A%2C%2017A%2C%2018A%20Service.pdf