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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

Hi Vladan, there was a problem with the amplifier, it had a variable gain, especially in low frequency, the cause: bad ground contacts by the PCB screws not tight enough. Now everything is stable, and

Hi , who can share schematic and eprom dump? thanks

Looking for a replacement U1 IC for the 7 seg decoder in HP 5383a counter. Heres a pic of the 5383a display circuit The manual shows HP part number 1820-0914 or Fairchild 9307 or Motorola MC8307P. If

Thank you for all your help. I've decided to order the original part. Istvan