HP 8596E diagrams - Page 1
Forum section: electronics / repair

author: hnjmkl
author_rank: Regular Contributor
timestamp: December 18, 2021, 09:49:37 pm
content: HP8596E I am attempting a repair, I have read the availability of the wiring diagrams under these P / N: 5958-7060 / 5963-2851 1992/1997 Component - Level information package (CLIP) with diagrams. can anyone tell me how to find them ?

author: Johnny10
author_rank: Frequent Contributor
timestamp: December 19, 2021, 01:39:12 am
content: https://xdevs.com/doc/HP_Agilent_Keysight/8590%20CLIP%205963-2591.pdfOn xdevs ?Maybe

author: hnjmkl
author_rank: Regular Contributor
timestamp: December 19, 2021, 11:58:50 am
content: Thank you for the valuable documentation provided.

author: hnjmkl
author_rank: Regular Contributor
timestamp: December 22, 2021, 01:05:59 pm
content: I am waiting for the repainted front panel to reconnect the keyboard and resume the investigation of the source of the fault.

author: Johnny10
author_rank: Frequent Contributor
timestamp: December 22, 2021, 03:14:31 pm
content: You have of course searched this forum for people who have repaired 8596E?https://www.eevblog.com/forum/repair/hp8596e-spectrum-analyzer-repair/I don't know what kind of problems you are dealing with.

author: EE-digger
author_rank: Frequent Contributor
timestamp: December 22, 2021, 11:11:18 pm
content: I repaired my 8596E about 4 years ago. Also, I don't know your problems.Mine had a large loss in-band in (I think) band 2, where the tuneable YIG filter kicks in.I ended up having to replace the YIG filter but learned a lot about it along the way, so that I was actually able to repair the replacement YIG filter, purchased unteseted from a guy in Israel for $800. No other options available at the time so took the gamble.If you have high, band specific loss, we can discuss further. The design of the HP YIG filter does not hold up well to fairly high temperatures (from its own magnetic coil power) as well as time ... although I guess, what, 20 years is not badThe YIG construction method leads to the problem but it can be fixed. With time and heat, the 3 YIG spheres move out of their "coupled" position and loss was running around 27dB.If you find that you may have a problem like this, PM me and I can explain the problem and the fix. The fix requires a strong heart

author: hnjmkl
author_rank: Regular Contributor
timestamp: December 23, 2021, 12:12:46 pm
content: I know the problems of getting my hands in the YIG, I would like to be sure that the problem is only him and not anything else. Initially the autocal in frequency reported no signal, the verification of the attenuator leads to having to replace it, completely broken. I ask if by inputting a 300 MHz input signal to the dual mixer I can establish with certainty that the defect lies exclusively in the YIG, if this procedure can be valid, I ask which RMS level the dual mixer accepts without damage.

author: MarkL
author_rank: Unknown
timestamp: December 23, 2021, 03:55:11 pm
content: The 8590 Series Assembly-Level Service manual is invaluable if you haven't seen it yet:https://xdevs.com/doc/HP_Agilent_Keysight/08590-90316.pdfIt has specific troubleshooting steps, along with RF test signal levels and test points in a table in chapter 6. The test points are shown on the block diagrams in chapter 9.As far as the CLIP schematics not matching your unit, you have to get the right CLIP set for your serial number. This information is also in the above service guide in chapter 12.

author: hnjmkl
author_rank: Regular Contributor
timestamp: December 23, 2021, 04:36:54 pm
content: finally have both, assembly manual and CLIP corresponding to 8596E, unfortunately, with KO attenuator and YIG perhaps also KO, the indications of the manual are of little use to me, I would be sorry to scrap it. as wide autocal is performed correctly ..

author: hnjmkl
author_rank: Regular Contributor
timestamp: December 27, 2021, 06:07:03 pm
content: Update on the defect of my 8596E, voltage HEATER YIG OK, -15V FLT- OK, a defect is in the FLT +, at no-load the + 15V is present, under load the voltage goes to -13V, a second defect is in the switch, HIBAND = 0

author: EE-digger
author_rank: Frequent Contributor
timestamp: December 28, 2021, 04:28:59 am
content: See my PM for details of my former efforts posted at groups.io for HP and Agilent test equipment.They only cover mis-alignment and re-alignment of the YIG spheres, a tricky little project

author: max-bit
author_rank: Frequent Contributor
timestamp: December 28, 2021, 10:52:22 am
content: Maybe more informationWhat are the symptoms of damageDoes the device show any errors?Unfortunately, these service manuals, which you have inserted the links, do not contain diagrams of the boards (they provide for the replacement of entire blocks - modules).You need to look for a service manual covering diagrams and diagrams of modules - boards. They are, but not that easy to find.

author: max-bit
author_rank: Frequent Contributor
timestamp: December 28, 2021, 11:35:54 am
content: you need to look for a service manual in the form of CLIP (there are schematics for individual PCBs).http://www.ko4bb.com/getsimple/index.php?id=manuals

author: hnjmkl
author_rank: Regular Contributor
timestamp: December 28, 2021, 12:33:59 pm
content: I have the CLIP of the A7 (analog interface) that manages YIG & YTO, The attempt to repair the defective input attenuator has put it out of use permanently, I am without input attenuator. The autocal in amplitude is performed regularly, the autocal in frequency is obviously impossible to activate it, the autocal YTF reports COMB SIGNAL NOT FOUND. I would first like to make sure at least the correct functioning of the YTO, is there a procedure for checking this? I don't have a second SA to do analysis, just a 2.2 GHz generator and a counter.

author: max-bit
author_rank: Frequent Contributor
timestamp: December 28, 2021, 12:51:38 pm
content: Are the voltages on YTO and YTF correct (including tuning voltage + - TUNE / + -FM)YTO generates signals above 3 GHZ, If you want to check the YTO you give ZERO SPAN at the lowest frequency.But you must have a frequency meter that measures above 3 GHzHow was the damage done? Is too much power applied?

author: hnjmkl
author_rank: Regular Contributor
timestamp: December 28, 2021, 01:55:11 pm
content: I bought it with the attenuator already broken, probably too much input power, the counter 5351B should be adequate, I add that I have no knowledge of the SA circuits, moreover in microwaves and not even their in-depth use.

author: max-bit
author_rank: Frequent Contributor
timestamp: December 28, 2021, 03:08:35 pm
content: If it was damaged as a result of applying too much power, the modules are most likely damaged:A3A2 - Switch YTF FilterA3A6 - Dual Band Mixer

author: max-bit
author_rank: Frequent Contributor
timestamp: December 28, 2021, 03:58:05 pm
content: Can you check (without attenuator) and give the signal (from signal generator) -10 dBm100MHz, 500MHz, 1 GHz, 2 GHz, 4 GHz? to the A3A2 input.And upload pics what the analyzer displays? Well, unless it displays nothing.

author: hnjmkl
author_rank: Regular Contributor
timestamp: December 28, 2021, 09:43:16 pm
content: Sending a signal directly to the YIG nothing happens, I have looked at what comes out of the YTO,setting various frequencies from the keyboard on the counter I read various frequencies. the most basic 4.77 GHz setting 50KHz, the highest 7.15 GHz setting 10.5 GHz, higher I always read zero, as well as below 50 KHz, with some values, for example 2 GHz the reading is zero.

author: max-bit
author_rank: Frequent Contributor
timestamp: December 28, 2021, 10:03:03 pm
content: Honestly, I don't understand a little bit?Did you send a signal to YIG? (after all, it generates a signal, not receives it).

author: hnjmkl
author_rank: Regular Contributor
timestamp: December 29, 2021, 09:23:28 am
content: In practice I bypassed the attenuator, no longer usable because complete failure with 100 MHz -10 db.

author: max-bit
author_rank: Frequent Contributor
timestamp: December 29, 2021, 09:57:23 am
content: We know that the attenuator is damaged.But we still don't know how the analyzer behaves.Best if you would take pictures of the screen what it displays there and give some signal to the A3A2 input.

author: hnjmkl
author_rank: Regular Contributor
timestamp: December 29, 2021, 07:57:20 pm
content: I have decided to give up the repair attempt, I will put it up for sale in parts, if the opportunity arises, maybe I will press something more recent, I thank everyone for the precious information received.

author: max-bit
author_rank: Frequent Contributor
timestamp: December 29, 2021, 08:02:54 pm
content: give a link to the offer

author: Johnny10
author_rank: Frequent Contributor
timestamp: December 29, 2021, 08:04:12 pm
content: max-bit you put some time into this I'd be looking for a deal.

author: hnjmkl
author_rank: Regular Contributor
timestamp: December 29, 2021, 08:47:23 pm
content: I had ordered battery and supercap, I will mount them as soon as they arrive, then I will put the link.

author: hnjmkl
author_rank: Regular Contributor
timestamp: January 03, 2022, 03:13:36 pm
content: What I visualized by inputting a signal in the lowband filter led me to continue in the enterprise, evidently the SA is not completely dead. The self-diagnosis routines have given me some help. I made an extension for the easy verification of A7 and a small breadboard with the test points on the signals of the connectors on A7.Checks: YTO coil resistance, main 38 ohm, FM 1.5 ohmThe photos refer to the diagnostic routines.SWEEP RAMP seems to have a marked offset on the positive also highlighted on the oscilloscope.MAIN COIL DR, the ramp seems to be missing the last 4 bits, the current probe positioned on the “main coil +” wire detects the 0-100 mA ramp visible on the oscilloscope.The FM COIL DRIVE ramp is generated, 0-50 mA but is not displayed on the screen (there is a flat line in the center), as shown by the current probe positioned on the FM + wire that goes to the coil and visible on the oscilloscope.The tensions, apart from the +15 which is +14.8, the others seem okay, including the + 10ref, what do you think?signs of lifesweep rampcoil main drmain coil dr 0-100 mAFM coil dr 0-50 mAworking conditions

author: max-bit
author_rank: Frequent Contributor
timestamp: January 03, 2022, 03:51:02 pm
content: 1. Maybe this is a stupid question why START is on the frequency - 921 MHz and MARKER is on -622 MHz?

author: hnjmkl
author_rank: Regular Contributor
timestamp: January 03, 2022, 04:30:13 pm
content: I don't know how to answer the question, I passed the YTO with a signal below 2 GHz to see if something appeared on the screen, playing with the keyboard those data appeared that I can't interpret, never used an SA.

author: max-bit
author_rank: Frequent Contributor
timestamp: January 03, 2022, 04:40:34 pm
content: But someone wrote this negative frequency? She didn't sign herself in.andHP analyzers have the feature that if you enter a negative frequency, they accept it and then show stupidity.Enter normally from e.g. 10 KHz to 2 GHz and see what will be displayed

author: Johnny10
author_rank: Frequent Contributor
timestamp: January 03, 2022, 04:44:06 pm
content: I'm not sure what I am reading here.You bought a broken SA and you want to fix it but you have never operated one before.Is that right?

author: max-bit
author_rank: Frequent Contributor
timestamp: January 03, 2022, 04:55:12 pm
content: And this is another truthBut I see in the pictures that the peasant has some equipment ...

author: hnjmkl
author_rank: Regular Contributor
timestamp: January 03, 2022, 06:10:24 pm
content: I bought it on ebay "used", in reality it was not working, just for a hobby and playing with it, since I never had the opportunity to use one.