On 4 Apr 2024, at 19:47, YO4HFU via groups.io <yo4hfu@...> wrote:

?

Few lines of U26 content (B and R) found corrupted. By analogy with channel A and through many attempts, I managed to restore 100% of the original values. I attach my original U4 & U26 files, maybe it will help someday. Now all 3 channels have accuracy better than 0.1dB.

*** The problem was caused by imperfect contact between EEPROM and ZIF (TL866II). The first read failed and from that moment the content was forever corrupted. So be careful if you want to backup :)

Thanks for support!

Robert

<HP8757C_3CH_EEPROM_YO4HFU.zip>

On 4 Apr 2024, at 14:19, Richard Parrish via <Richard@...> wrote:

Correct, I see that they no longer have the schematic manual on line but the user manuals, basic service manual, and the troubleshooting?manuals can be found easily.? Since the 8360 series generators have more than 90% of it's assemblies in common with each other, they're a relatively easy box to troubleshoot in my opinion at least.

Richard

---

From:?[email protected]?<[email protected]> on behalf of Patricio A. Greco via??<patricio_greco@...>
Sent:?Thursday, April 4, 2024 12:09 PM
To:?[email protected]?<[email protected]>
Subject:?Re: [HP-Agilent-Keysight-equipment] Caution: No IF Found

?

Not all manuals are available on Ks website …?

Ing. Patricio A. Greco
Taller Aeronáutico de Reparación 1B-349
Organización de Mantenimiento?Aeronáutico de la Defensa OMAD-001
Laboratorio de Calibración ISO 17025?AREA: RF/MW?
Gral. Martín Rodríguez 2159
San Miguel (1663)
Buenos Aires
T: +5411-4455-2557
F: +5411-4032-0072

On 4 Apr 2024, at 14:04, Richard Parrish via??<Richard@...> wrote:

For what its worth, all of the 8360 series manuals are available for download from the Keysight website or others last time I checked.

Richard

On 4 Apr 2024, at 14:04, Richard Parrish via <Richard@...> wrote:

For what its worth, all of the 8360 series manuals are available for download from the Keysight website or others last time I checked.

Richard

On 4 Apr 2024, at 13:19, shaider.msee20seecs via <shaider.msee20seecs@...> wrote:

Thank you Patricio. That will be great if you can scan part of the troubleshooting manual. Additionally, If you can share block diagram of 83651B swept series synth would be great.

I have two questions:
1 - How do you run a self-test using front panel of HP8510C to get the trouble shooting code RF.XXX?
2- What is meant by SAF module (what does it stand for?)? By SRD do you mean a step recovery diode? Are these housed here on the 83651B (marked on image)? I am not sure whether if i should open this and look for a burned IC?

<IMG_7362.jpg>



Secondly, I tested the power at the output of Aux output on the rear side of 83651B. At 4GHz, I see -30dBm. When i increase the frequency to 10GHz, I see -50dBm.


<IMG_7361.jpg><IMG_7360.jpg>

On 4 Apr 2024, at 13:19, shaider.msee20seecs via <shaider.msee20seecs@...> wrote:

Thank you Patricio. That will be great if you can scan part of the troubleshooting manual. Additionally, If you can share block diagram of 83651B swept series synth would be great.

I have two questions:
1 - How do you run a self-test using front panel of HP8510C to get the trouble shooting code RF.XXX?
2- What is meant by SAF module (what does it stand for?)? By SRD do you mean a step recovery diode? Are these housed here on the 83651B (marked on image)? I am not sure whether if i should open this and look for a burned IC?

<IMG_7362.jpg>



Secondly, I tested the power at the output of Aux output on the rear side of 83651B. At 4GHz, I see -30dBm. When i increase the frequency to 10GHz, I see -50dBm.


<IMG_7361.jpg><IMG_7360.jpg>

On 4 Apr 2024, at 06:47, shaider.msee20seecs via <shaider.msee20seecs@...> wrote:

On Thu, Apr 4, 2024 at 04:47 AM, Patricio A. Greco wrote:

Thank you for your suggestions everyone.

Patricio you mentioned that i should measure the output of this module. In Ideal case, what am i supposed to see at the aux output?

Best Regards

On 4 Apr 2024, at 08:20, shaider.msee20seecs via groups.io <shaider.msee20seecs@...> wrote:

?On Thu, Apr 4, 2024 at 04:47 AM, Patricio A. Greco wrote:

Thank you for your suggestions everyone.

Patricio you mentioned that i should measure the output of this module. In Ideal case, what am i supposed to see at the aux output?

Best Regards

On 3 Apr 2024, at 18:58, shaider.msee20seecs via groups.io <shaider.msee20seecs@...> wrote:

?

Hi All,

Thank you for adding me to the group. I have HP 8510C which is given me “Caution: No IF found” and when it tries to measure higher frequency (say above 5 GHz) then the signal gets acquisition becomes slow and distorted.?

From a service manual i saw that it occurs when power is very low about -20dB but in my case i had set to -5dBm. I tried increasing the power but all in vain.?

I suspected that there might be issue with source. It comes with 8360 swept series synthesiser which i have one going upto 20GHz and other going upto 50 GHz.?

I connected spectrum analyzer at the output of the source synthesizer (50GHz option) and saw really less power of about -39dBm @5GHz with a 10db attenuator.

I did the same steps with source synthesizer (20GHz option) but saw a higher power at @5GHz. Thus, i knew something was wrong with source synth (50GHz option).

After that, i disassembled the source top panel to see if i can detect a faulty connection/ component. I noticed the last component in the chain is a component named 5086-7603. I believe its an amplifier that also provides power levelling (need anyone of you to confirm that).?

I then proceeded to disconnect the input of this component and connected it directly to spectrum analyser and saw power was -34dbm which was 5dbm better than what i measured before (39dbm).?

I have so far established that this component might be faulty. I would like to know from your experience if you can guide me further on this with any suggestions. Share any block diagram of the swept series synthesiser.?

Any suggestions to fix this issue are most welcome.

Thanks

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