Hello guys,
I have an 8560E analyzer, it is turning on but it shows error 335 on the screen, according to the service manual it refers to the sampling oscillator, I went deeper in the research and detected that the 28V voltage was absent on the A2, I did a brief analysis at the source, where the TP304 had no voltage. I ask, has anyone had this problem? Does anyone have here in the documentation group that the components for replacement can be identified? I appreciate the help of friends! thanks.
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Re: Hp 8590a spectrum analyzer
Yes, but those are obsolete. These seem to be the replacements nowadays:
On Wednesday, August 31, 2022 at 03:24:13 PM PDT, Richard Cook <richardcook331@...> wrote:
Thanks Alex , I'll try that when I get the power supply re installed tomorrow.? I was wondering how to check that. What's the correct part number for that diode pack?. Hsms 2822 or something like that.? Thanks.?
On Wed, Aug 31, 2022, 18:02 Alexander Saydakov via <sandy_saydakov= [email protected]> wrote:
Connect the input to the calibration output and turn the corrections off. Is the main tone about -20 dBm? if it is significantly lower (say, -30) then most probably the mixer diodes in the first converter are bad. The corrections try to compensate, but it is too much to compensate. As I understand, the corrections must be within a fraction of dB typically.
On Wednesday, August 31, 2022 at 02:51:02 AM PDT, Richard Cook < richardcook331@...> wrote:
You are most right. It may be better to leave it alone. But I know the power Supplies are hard to come by so I think replacing the caps with high grade ones and safety caps isn't a bad idea. Like I said I never have delt with repair of one of these animals so I may just keep in mind the noise floor and use it.?
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Re: Hp 8590a spectrum analyzer
Thanks Alex , I'll try that when I get the power supply re installed tomorrow.? I was wondering how to check that. What's the correct part number for that diode pack?. Hsms 2822 or something like that.? Thanks.?
On Wed, Aug 31, 2022, 18:02 Alexander Saydakov via <sandy_saydakov= [email protected]> wrote:
Connect the input to the calibration output and turn the corrections off. Is the main tone about -20 dBm? if it is significantly lower (say, -30) then most probably the mixer diodes in the first converter are bad. The corrections try to compensate, but it is too much to compensate. As I understand, the corrections must be within a fraction of dB typically.
On Wednesday, August 31, 2022 at 02:51:02 AM PDT, Richard Cook < richardcook331@...> wrote:
You are most right. It may be better to leave it alone. But I know the power Supplies are hard to come by so I think replacing the caps with high grade ones and safety caps isn't a bad idea. Like I said I never have delt with repair of one of these animals so I may just keep in mind the noise floor and use it.?
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Re: Hp 8590a spectrum analyzer
Connect the input to the calibration output and turn the corrections off. Is the main tone about -20 dBm? if it is significantly lower (say, -30) then most probably the mixer diodes in the first converter are bad. The corrections try to compensate, but it is too much to compensate. As I understand, the corrections must be within a fraction of dB typically.
On Wednesday, August 31, 2022 at 02:51:02 AM PDT, Richard Cook <richardcook331@...> wrote:
You are most right. It may be better to leave it alone. But I know the power Supplies are hard to come by so I think replacing the caps with high grade ones and safety caps isn't a bad idea. Like I said I never have delt with repair of one of these animals so I may just keep in mind the noise floor and use it.?
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I was looking for info on this YTO, and stumbled upon this ebay listing, which I found to be very informative, and disturbing:
https://www.ebay.com/itm/HP-AGILENT-YTO-YIG-REPAIR-5086-7903-8593E-8594e-8595e-8596e-8592L-8593em/252216883196
This has a bunch of info on these YTOs. What I find disturbing is that it appears that a whole family (856X and 859X) of HP portable SAs may have a serious reliability issue - big enough to support a cottage industry repairing their YTOs. Maybe the the actual failure percentage is tiny, and there are just a lots and lots of units out there, so no big deal, but it seems like an awful lot of failures to me. I don't have any of these models, so it doesn't affect me, but I wonder what the deal is. My experience with lots of old-school YIG devices is that they last virtually forever, unless abused.
Ed
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Thank you for the information, John! I tried to increase the tuning coil current up to 200 mA but to no avail.
Then, I also wanted to look at the second YTO under the microscope, the one extracted from the HP8560E and I discovered to my surprise that the wire connected to the PIN of the 5 VDC power supply was interrupted.
With a lot of patience and using the finest soldering iron tip I had, I pre-wetted the PIN. Then using a thinned toothpick I bent the wire until it touched the PIN. And I lightly rested the tip of the soldering iron on it for a moment.
I checked and the soldering was successful. I did well? I used as little tin as possible to avoid tin bubbles that could out-scale the YTO.
Unfortunately my microscope has a maximum magnification of 57X. It would take one with at least double the magnification.
I connected the YTO to the power supplies by crossing my fingers and to my surprise I found that it worked!
The peak power, about 13.5 dBm, I get it with a tune current of 90 mA.
Instead I noticed that the absorbed currents, with the YTO running, have varied a lot, that is:
+5 VDC, 73 mA
+15 VDC, 20 mA
-15 VDC, 7 mA
I reinstalled the YTO in its SA and checked it was working properly. I kept it running for several hours doing all the tests possible, all passed positively.
At this point the hypotheses for the breakdown of the second YTO have narrowed down to only two:
1- internally the YTO of the HP8560E, although similar in structure, differed slightly from that of the HP8563E. Question: Were there different versions made? Or is the YTO mounted on the HP8560E not the 5086-7906? So why did it break?
I also found that this YTO has been repaired. Internally there are several scratches ...
2- The +5 VDC voltage of the HP8563E has some problems. I checked it and it is stable and precise but, I doubted that some tantalum capacitor (there are several on that line) is interrupted and the power on extra current, not absorbed by the capacitor, may have caused it to burn the two YTOs.
Could mine be a valid hypothesis?
Sorry if I'm insisting on the subject, but I just want to try to understand and learn and thank you all for your cooperation!
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HP8561E and HP8341A as tracking source?
Hi All!
Tell me please if it possible to use HP8341A as tracking generator for HP8561E and how to interconnect them (HP-IB, BNC...)?
What steps of configuration in menus?
Best regards,
Roman.
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If you're looking to work on it for you try?. GL, --Lenny Wintfeld (W2BVH)
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Re: Hp 8590a spectrum analyzer
You are most right. It may be better to leave it alone. But I know the power Supplies are hard to come by so I think replacing the caps with high grade ones and safety caps isn't a bad idea. Like I said I never have delt with repair of one of these animals so I may just keep in mind the noise floor and use it.?
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Re: Hp 8590a spectrum analyzer
In the end I gave up on the noise fail. I just have to be aware that the noise floor is not what it should be, but it has not mattered for my measurements. There should be no loose screws. The lids should be screwed tight. You have a tremendous amount of gain and any leakage will matter.
I did try to tune mine, following the procedures in the service manual. You need to manufacture test fixtures, capacitor and resistor if memory serves me and plug those into the points provided then trim. FWIW you will find that suitable connectors that fit the pins can be bought in any auto store. The ones used for watertight engine connections fit perfectly. Let me see if I can find the ones i soldered and take a picture.
You could also leave it as it is because you might mke things worse..
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Re: Hp 400D serial number decoder
I will guess the power supply electrolytics were manufactured by Sprague. When I worked at HP in the early 70¡¯s, Sprague was their preferred vendor. The Sprague electrolytics all had a 4 digit manufacturing date code¡ª yyww. yy is the last two digits of the year and ww is the week number.
While this doesn¡¯t precisely date the instrument, it puts a bound on the instrument manufacturing date obviously later than the latest component manufacturing date code. Identifying various date codes is a useful skill.
73 Jeff Furman AD6MX
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Re: Hp 400D serial number decoder
Thanks Jim for narrowing down the dates. ?
Good suggestions on changed out the large paper caps.?
I do have a couple other project ahead of this meter.?
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On Aug 30, 2022, at 7:21 AM, Jim Adney <jadney@...> wrote:
?On Tue, Aug 30, 2022 at 01:03 AM, Dave Miller wrote:
A 400D found it¡¯s way home tonight.?
I am trying to decode serial number to approximate its vintage.?
Serial number is 16210. ?That does not seem to fit into any of the decoders I have found to online to date.?
That's a mid- to late- 1950s vintage. The coding of the date into the serial prefix did not start until 1960. Before 1960, HP just used a plain serial number. After 1960, HP used a serial prefix that encoded the year and week the design was finalized, then a letter followed by a sequencial serial number. I found a error notice from HP on the 400D, dated 1959, that talked about serial nos. before 29721, so yours must be well before 1959. The first thing to do with your 400D is to replace all 4 of the large paper caps. These are ALL bad (leaky) by now. Three are plate to grid coupling caps in the amplifier stages and one is in the power supply. The three will pull the following grids up high putting those tubes into way too much conduction. Each of those three is in parallel with a mica cap for higher frequencies. The micas are usually fine, but I've had one that was also leaky. Check the grid voltages when you think you're done, to make sure none of them are still being pulled high. Leakage in the 4th cap doesn't seem to bother the power supply, but you might as well replace it anyway, while you're at it.
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Hello Jeff,
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I have an HP 8640B to repair for a fellow radio amateur. When it
came to me, none of the knobs would move, and it appeared as though someone had
used a pipe wrench to turn the frequency band select knob ¨C the wing was broken
off. Internally, the gears were stripped and many bearings were seized up.
After an overall lubrication and replacement of stripped gears, I got it going
again, except that the frequency readout doesn¡¯t work.
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To get this set back to serviceable condition, I want to replace
the frequency band select knob and the frequency counter. Can you help, please?
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Cheers, Brian, VK2GCE (Australia)
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I
have several parts units I bought to keep mine that I used to teach with going.
Not needed any longer, so if you need something, get in touch and I can pull
the part out. I suspect the fingers are gone on the bandswitch, which is why
these were sold as parts. Otherwise complete.
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Below is a high level YIG tuning coil freq v current graph. 50 mA is to low, 125mA is about mid range 3-7GHz based on a similar HP YIG from a HP-8594E. 
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Howdy all,
I'm working on an 8753A and it seems that I am having an issue with the B channel.? I noticed this when I went to check the loss on a cable and ran an S21 scan that gave me some really wonky readings.? I did some digging in the manual and ran through some of the test - specifically Test 17 (ADC Linearity Test) which promptly failed.? ?This led me to run a receiver noise test and it confirmed what I was seeing - B isnt working so good.? From the receiver noise test on A I get a reading of 15uU (about -96db within spec) and on B I get a reading of 60 mU ( -25db not so good).? I swapped the receivers for A and B and get pretty much the same result and I'm a little suck at this point on what to look at next.? I know there are a few test points on A10 but I can't find any values for them.? I do know that just casually probing in the mv range I get the following but not sure the data is meaningful -
After the gain stage on A10
TP3 - I get a fluctuation of about -29 to -31 mv (A)
TP6 - I get a steady 31.5 mv - no fluctuation (B)
Before the gain stage on A10
TP 18 - I get -31.5 mv which seems pretty steady (A)
TP 20 - I get -1mv (B)
I've also pulled the bottom cover off and pulled the A10 card out and measure the same voltages at P1 4 (A TP18) and 7 (B TP20) without the A10 card in place.? Any help at this point is appreciated.
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Anyone know how I can get an E1437A calibrated? (Keysight says they no longer support this product)
I'm hoping one of you guys knows where I can get a VXI?E1437A board calibrated.? It's for work, and I tried to get Keysight to cal it, but after 2 weeks they said they are unable as their cal software no longer works.?
Prefer a location in the US if possible.
Thank you,
Dave
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A lot of them tune at 20 MHz/mA, so 100 mA may not have been enough.? I'd crank the main coil current up to 200 mA and see if that makes a difference. ? -- john, KE5FX ?
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From: [email protected] [mailto:[email protected]] On Behalf Of piecolav via groups.io
Sent: Monday, August 29, 2022 10:09 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 5086-7906 YTO? Today I tried to power the YTO 5086-7906, that of the 8563E, externally to the analyzer.
Granted that I have checked all the components of the small PCB on the oscillator, I noticed that the current absorbed values are:
+5 VDC, 98 mA
+15 VDC, 28 mA
-15VDC, 1mA
I also powered the main coil (pins 5 and 6) with a current from 50 to 100 mA, not knowing the exact operating value.
By adjusting the latter, the value read on the power meter does not change: about -28 dBm. Instead of the expected +10 dBm!
Now I'm sure the YTO is broken.
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Hi Ed, unfortunately the RF signal output connection is via a female SMA connector. The YTO 5086-7906 is built very well, as per HP tradition, and it is also easy to open it, having a little foresight and in a non-dusty environment.
I opened one of the two, broken, that I have, to check if inside there were any burn marks or gold wires, welded with the wire bonding technique, interrupted. Unfortunately, even with the microscope I did not find anything abnormal.
Opening the YTO is very easy: just remove the locked rear cover and unscrew the rear spacers.
The oscillator thus opens in two parts, the rear contains the two windings of the MAIN COIL and the FM COIL and the front contains all the electronic circuitry I believe on a sapphire substrate, including the ball in yttrium iron garnet.
Much of what I know I learned from reading the Keysight forum thread at: https://community.keysight.com/forums/s/question/0D52L00005IdorQSAR/hp-8560e-spectrum-analyzer-yig-yto- a11-questionproblem
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I have several parts units I bought to keep mine that I used to teach with going. Not needed any longer, so if you need something, get in touch and I can pull the part out. I suspect the fingers are gone on the bandswitch, which is why these were sold as parts. Otherwise complete.
Jeff Kruth
kmec@...
In a message dated 8/30/2022 11:35:15 AM Eastern Standard Time, ktx85@... writes:
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Ok....is there someplace I can find parts to repair mine....
?
I am not the original owner...how can I tell if they have gone to far and done any damage to the VFO ?
?
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-------- Original message --------
From: Dave Wise <david_wise@...>
Date: 8/30/22 9:53 AM (GMT-06:00)
Subject: Re: [HP-Agilent-Keysight-equipment] Hp8640b
?
The eight-turn stop is essential.? If you go more than eight turns and smash the back end of the cavity, the VFO is irreparably ruined.
I don¡¯t know what is safe to degrease that plastic.
?
?
-------- Original message --------
Date: 8/29/22 6:07 PM (GMT-06:00)
Subject: Re: [HP-Agilent-Keysight-equipment] Hp8640b
What about the small bit of plastic on each side of the cam closest to the pin that has worn away on each side creating a small ramp....?? ?What do you suggest to use as a cleaning agent or solvent?
I haven't posted very many times and tried to resend the pictures...
-------- Original message --------
Date: 8/29/22 6:00 PM (GMT-06:00)
Subject: Re: [HP-Agilent-Keysight-equipment] Hp8640b
The stacked plates of the eight-turn stop should be free to rotate with respect to each other to the limits of their respective dogs.? Sounds like yours have frozen together into a single rigid lump.? You¡¯ll need to free them up, degrease with something that doesn¡¯t attack them, and put on a bit of fresh grease.
?
HTH,
Dave Wise
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Hello all,
I recently acquired a hp8640b..
With a quick.? Checkout all seems to function...EXCEPT a detent in the frequency generator...when it hits this plastic (cog) it makes it very difficult to tune the frequency...( it does tune.)? This is my first generator and I have searched the internet for this issue elsewhere....it appears that all the other places I have found a picture of these cogs( think combination lock tumblers ) they are spaced out and not all bunched togeather like stair steps as in my picture...I have a red pointer pointing at the issue....the metal pin hits the cog on each revolution of the dial
I look forward to your help in this repair. And sourcing the parts to repair it...I am also looking for 1 black foot
73
Ktx85@...?
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Ok....is there someplace I can find parts to repair mine....
I am not the original owner...how can I tell if they have gone to far and done any damage to the VFO ?
toggle quoted message
Show quoted text
-------- Original message --------
From: Dave Wise <david_wise@...>
Date: 8/30/22 9:53 AM (GMT-06:00)
Subject: Re: [HP-Agilent-Keysight-equipment] Hp8640b
The eight-turn stop is essential.? If you go more than eight turns and smash the back end of the cavity, the VFO is irreparably ruined.
I don¡¯t know what is safe to degrease that plastic.
?
?
-------- Original message --------
Date: 8/29/22 6:07 PM (GMT-06:00)
Subject: Re: [HP-Agilent-Keysight-equipment] Hp8640b
What about the small bit of plastic on each side of the cam closest to the pin that has worn away on each side creating a small ramp....?? ?What do you suggest to use as a cleaning agent or solvent?
I haven't posted very many times and tried to resend the pictures...
-------- Original message --------
Date: 8/29/22 6:00 PM (GMT-06:00)
Subject: Re: [HP-Agilent-Keysight-equipment] Hp8640b
The stacked plates of the eight-turn stop should be free to rotate with respect to each other to the limits of their respective dogs.? Sounds like yours have frozen together into a single rigid lump.? You¡¯ll need to free them up, degrease
with something that doesn¡¯t attack them, and put on a bit of fresh grease.
?
HTH,
Dave Wise
?
?
Hello all,
I recently acquired a hp8640b..
With a quick.? Checkout all seems to function...EXCEPT a detent in the frequency generator...when it hits this plastic (cog) it makes it very difficult to tune the frequency...( it does tune.)? This is my first generator and I have searched the internet for
this issue elsewhere....it appears that all the other places I have found a picture of these cogs( think combination lock tumblers ) they are spaced out and not all bunched togeather like stair steps as in my picture...I have a red pointer pointing at the
issue....the metal pin hits the cog on each revolution of the dial
I look forward to your help in this repair. And sourcing the parts to repair it...I am also looking for 1 black foot
73
Ktx85@...?
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imaurente .
Anders
Brian