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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

Also, how is the voltage on your new battery? -mark

Odd that D13 would now be off.? We'll assume the 68230 and related circuitry is ok for the moment. Along the same lines as what Yves suggested, you could also try resetting the CRT to DEFAULT

Mark I took the boards back out and cleaned all the contacts good and seeded them in and out a few times now the lite D13 is off. I do still have the screen issue shown in the video. I also tried what

Hi, Hardyhansendk. Thank you for your response, As you mentioned about W9 cal signals, When I tested there I'm getting 50Mhz with -60dB not -25dB, it would be helpful if you share info regarding that.

After further digging into my Ref Unlock error message on the HP8591A Spectrum Analyzer I have found the following. The 600 MHz SAW oscillator on A9 Third Converter assembly seems to oscillate at only

Mark yes the display was normal.

All LEDs should go off once boot is complete and the initial hardware check is finished. ?D13 being left on indicates there is a problem with the 68230 (U57) Parallel Interface/Timer. ?See Table

Hi, I think you may have lost the calibration constants, at least the ones related to the display. You'll have to do a blind test. The soft buttons near the screen, the top one is #1 and the