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Well I believe I found the newest software https://www.ko4bb.com/getsimple/index.php?id=manuals&dir=01_ROM_Images_and_Drivers/HP_8590/HP_-_8590-ROM-1998/98-06-15 My question is I only have 2 EPROMS

Hi Anders, I'm glad to hear that you were able to fix your Spectrum's 600 MHz VCXO circuit and get it working. Yves

The 3456A is a very nice meter, and I think the only of its sort HP ever certified as a transfer standard. There are a couple of failures you should watch for. First, the more desirable is the

Yves thanks for sharing that info after I read the ENTIRE how to input constants section I found at the very end a work around so I’m good now. Now I’m just looking for the newest firmware version

Mark I did get everything working last night thank to your help I appreciate it! I ran it through some tests and it passed them all so the firmware was my next leap. Fortunately I have done some chip

I am very impressed by your knowledge Yves! My spectrum analyzer is fixed now - at least sort of fixed. My fix was to replace C75, change from 3.3 pF to 2.2 pF. Conditions after the fix: 300 MHz

I repaired an 8591A for a friend two weeks ago, and he had the same problem. In his case, it had lost its calibration constants due to a low battery. What caused the signal not found or LOCK

Hi Andrew, It's ok to have 2 or 4 EEPROMs for version G (94.03.15).? You can read about the various versions and EEPROM part numbers here (original doc

Mark, my 8594E only has 2ea firmware chips U24 & U27, is this normal? Everything I seem to find about this unit says 4 chips? I was trying to see if I had the latest firmware installed.

Recently saw a you tube video of an HP-5087A with an HP designed (I think) fail over amplifier board. I have never seen any documentation on the board before. The board takes a signal from two of the

Anders, So, in green is the active bias stage, R66 serves as the current sense. In my case, I have 5.186V, which means that the collector current of Q13 is about 9.8mA. In blue is the

Thanks Mark, ya I did all that but did just see this so I will try next. Instrument firmware expects the cal output signal to be 300 MHz ± 2 MHz.Sometimestheinstrument default data is not able to

The workaround for the "Cal Signal Not Found" error is covered in the Assembly Level Repair manual. If you had to reload all the correction constants, I would start with the "Analyzer Initialization"

After replacing battery I entered the Time Base Correction, Frequency Response Correction & Step Attenuator Corrections. Now when I go to perform Cal Freq or Cal Amptd I’m getting a Cal Signal Not

Great, glad the sync reset worked! It makes me wonder, however, if the CRT parameters were corrupt in SRAM, then what else might be corrupt? ?I would take a quick pass through the calibration

Thanky you for the valuable information Yves! I have now checked a bit further and made sure the VTO_TUNE reached the A9 Third Converter assembly ok. My VTO_TUNE voltage varies between -0.43 (10 MHz

I picked up the meters today. They are model 3456A. Both work, but need some cleanup. The power switch on on unit sticks on and the front/rear terminal switch is dirty. A quick checkout shows both

Reset worked Config, 6, 6, 3. Thank you!!!!

6.3Vdc

Hi, I tested this with my 8591A. I used an external generator for the 10 MHz reference. I measured the 300 MHz signal returning to the A15 COUNTER LOCK module. This way, I tested the path