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Re: HP 8753A VNA - Help please: On the A9 (CPU) module where is the CC (NORMAL/ALTER) jumper?
开云体育Dave,Which CPU board do you have? 08753-60079 or 08753-60067? There was an earlier one but manual says no documentation for it believe it was -60006. The drawing in the manual has no labels shown on the header pins and it does show it as being a 4pin header. The schematic lists labels as E7-E22. The CPU board (60079) layout appears to show a 5pin header with the run jumper across the second set of pins (from bottom) for the run position. The board layout shows U35 to the right of the header. I have a A model and can check the header for you if you need. Chuck On 12/7/2024 8:41 AM, David Feldman via
groups.io wrote:
Hi Chuck, Thanks for the ASCII-Art depiction. Just want to re-confirm, so could you take a look at this? I found a 5-pair (not 4-pair) jumper header set, oriented vertically, in the lower left (holding board, bottom down, facing component side) of the board. Just to the left of the header set is the bottom of the large CPU chip. To the right of the header set is an IC labeled U35. From top to bottom, the five jumper position pairs are labelled as follows: E25 E26 (top) E27 (blank) (blank) (blank) E31 E32 E33 (blank) <- this is the only pair that currently (in run position) has a jumper While I suspect from your description that the normal running position is on E33/blank, and the CC position is at the top, E25/E26? Does this appear to be correct? Thanks! --
See Early TV and Vintage Test EquipmentChuck Azzalina |
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Re: HP 8753A VNA - Help please: On the A9 (CPU) module where is the CC (NORMAL/ALTER) jumper?
Hi Chuck,
Thanks for the ASCII-Art depiction. Just want to re-confirm, so could you take a look at this? I found a 5-pair (not 4-pair) jumper header set, oriented vertically, in the lower left (holding board, bottom down, facing component side) of the board. Just to the left of the header set is the bottom of the large CPU chip. To the right of the header set is an IC labeled U35. From top to bottom, the five jumper position pairs are labelled as follows: E25 E26 (top) E27 (blank) (blank) (blank) E31 E32 E33 (blank) <- this is the only pair that currently (in run position) has a jumper While I suspect from your description that the normal running position is on E33/blank, and the CC position is at the top, E25/E26? Does this appear to be correct? Thanks! |
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Re: HP 8753A VNA - Help please: On the A9 (CPU) module where is the CC (NORMAL/ALTER) jumper?
开云体育Dave:Here is crude diagram of the CC jumper location. _______ |????????? | |????????? | |????????? | | cpu??? | |????????? | |????????? | -----------?? J4 ??????????????? __ ?????????????? |. .| jumper position to load correction constants ?????????????? |. .| ?????????????? |. .| ?????????????? |. .| jumper position to operate ?????????????? ----- Pull jumper off pins in lower position and push it on the upper position pins as shown above to enable load constants Reverse procedure when finished loading constants ChuckA On 12/6/2024 9:41 PM, David Feldman via
groups.io wrote:
On my HP 8753A VNA, I am trying to follow the instruction for enabling adjustments to stored calibration constant data (needed after replacing A9 CPU module with a different unit and getting related start-up errors). Working with HP 8753A_B_C Service manual 08753-90156, readily available online, I downloaded from: In the section (indexed as "Adjustments", titled "Adjustments and Correction Constants", starting at PDF page 159: The instruction text is this: "A9 CC (CORRECTION CONSTANT) JUMPER POSITION" "Move the A9 CC jumper, as explained next, to the ALTER position to change..." however, where (in the next few bullet points) this is explained, the assumption evidently is that the reader knows where on the A9 CPU board the CC jumper is located. ---> I am unable to find any jumper labeled CC on the CPU board (unless it's totally obvious and I keep missing it!) <--- Thanks for a description, pointer or other advice (or request for clarification, however, I'm hoping this is a basic problem that is fairly self-explanatory!) Dave --
See Early TV and Vintage Test EquipmentChuck Azzalina |
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HP 8753A VNA - Help please: On the A9 (CPU) module where is the CC (NORMAL/ALTER) jumper?
On my HP 8753A VNA, I am trying to follow the instruction for enabling adjustments to stored calibration constant data (needed after replacing A9 CPU module with a different unit and getting related start-up errors).
Working with HP 8753A_B_C Service manual 08753-90156, readily available online, I downloaded from: In the section (indexed as "Adjustments", titled "Adjustments and Correction Constants", starting at PDF page 159: The instruction text is this: "A9 CC (CORRECTION CONSTANT) JUMPER POSITION" "Move the A9 CC jumper, as explained next, to the ALTER position to change..." however, where (in the next few bullet points) this is explained, the assumption evidently is that the reader knows where on the A9 CPU board the CC jumper is located. ---> I am unable to find any jumper labeled CC on the CPU board (unless it's totally obvious and I keep missing it!) <--- Thanks for a description, pointer or other advice (or request for clarification, however, I'm hoping this is a basic problem that is fairly self-explanatory!) Dave |
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Re: HP 8566B issue above 18.5GHz ?
Thanks to all of you for all the information and replies. Indeed, the analyzer will most likely require band E tuning, but since it requires adjustments inside of the the box, I need to be 100% sure that it is not a sweeper issue. Unfortunately, due to the lack of another analyzer and power meter, I will have to put the repair on hold for a while. As soon as I manage to solve the problem, I will let you know.
Thank you again for help.
Best regards, Wojciech |
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Re: HP141T with multiple sections
Don't list it for free, it'll just get picked up by the local trader, like the working one on the MIDCARS sale a few years ago, that buyer had absolutely no clue how to use it, twiddled all the controls, set the intensity to max for the pictures and listed in on ePay for 4 times the price.
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The comment about tech schools, no school here would want something this old, they would chuck it straight in the nearest skip if you donated it to any here.
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Even though it's old, it's still inexpensive compared to modern stuff for the range the 8555A covers, of course the front end on anything old could be damaged, the same can be said for second hand modern kit.
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And yes I wouldn't bother with an LCD kit myself.
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David |
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HP8753E, 8753D, 8753ES 3.5" disk drive replacement reference information
These go bad over time.? Often they will give a little warning and be "flakey" for a while before they fail catestrophically.? While there are other good options to save data via GPIB, etc., here is some information for those who wish to keep your drives functional.?
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Here are the original part numbers as far as I have been able to determine:
HP8753D:? FD-05HF 240, Teak, PN: 19307522-40.? HP part number 0950-2348.
HP8753E:? FD-04HF 2304, Teak PN: 19308023-04.? HP8753ES:? FD-05HF 5630, Teak, PN: 19307556-30. HP8753ES:? FD-05HG 5701, Teak, PN: 19307557-01. ?
Prices for these original drives tend to hover around $100, though sometimes they are as low as about $30
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Suitable generic replacements:
FD3238H (NEC) (narrow, spacer required on side if used with the D or E)
MPF820 (sony) (narrow, spacer required on side if used with the D or E)
MPF720-3 (sony) (narrow, spacer required on side if used with D or E)
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Prices for these replacement drives tend to be around $20, but are sometimes less.? The side eject button on the 8753D is relatively rare if you do not use the original part number.? Grey is also rare as most of the replacement drives are black.
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Please add additional details, options for replacements, etc., in the comments. |
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Re: HP141T with multiple sections
开云体育One advantage of the 141 system - it's repairable. Gary Appel On 12/5/2024 4:26 PM, VE6WMR via
groups.io wrote:
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Re: HP141T with multiple sections
Time moves on. I don't think I'd spend the time or money to retrofit a HP141T.
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On another more modern, valuable model with parts NLA,? it might be worthwhile. List your unit free for pickup and see it gone. There's hundreds of other projects to start that make more sense. |
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Re: Troubleshooting a 8591e with opt 130
Hey Adri and Yves,
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To begin with the spikes while varying Ref levels that where only present with Correct on, these are indeed gone. I'm guessing they where caused by incorrect gain in the Lin vs Log paths causing the self cal to try to correct that away but at a certain point there's some kind of a crossover and there the corrections causes 2 levels which should be 10dB apart to get so close together that you get these strange spikes. How are the Lin and Log levels when correct is off, or even with a Factory default cal for your analyzer?
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Over to the Freq Uncal Issue, this one was rather easily to tackle luckily. I removed the RF section again, took out the YTO, took it apart, checked all the flatcable leads with a low resistance meter, all fine. Rebuilt my RF section and turned the analyzer back on, issue still present.. Then I had a good scratch behind the ears and looked at the schematic, checked all the connections to the YTO to see where to start measuring. Instead the STBL line caught my eye, used to stabilize (i guess) the FM coil drive voltage in certain cases, but it was coming from the same 74HC374 I had previously replaced because of the A5 attenuator driver line. I already reinstalled the original 74HC374 but still in the IC socket. Thinking that was too much of a coincidence I gave the IC a small push with a screwdriver and the Freq Uncall is gone right away. So the IC just wasn't seated well enough. i'll make a mental note to remove the socket and directly solder it in again some time soon.
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So now i'm going to but the RF section back and install the Fast ADC option this time, let it warm up again and do another full self cal, let's see if the analyzer is fully up and running again.
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Marco |
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Re: Wanted: Manual for HP 6116A power supply
Well, how about that. Something must have been up with my internet, as the manual didn't show up on the Artek site when I checked before...
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I am a happy repeat customer, so that might be the easiest, pending sourcing the paper manual from ebay.
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Thanks!
Jared |
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Re: Shielded probe cables?
Yes, the connector on the chassis I believe is FCN-215Q060-G/0 (male).? And for completeness, the connector on the cable side is FCN-214J060-G/0 (female).
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There are a couple of different flavors, such as straight and right angle for both.? Here is the datasheet:
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However, after looking this morning I'm not seeing much availability.? Maybe you'll have better luck.? A possible source could also be salvage from a hopeless LA module.? There's no lack of these connectors out there that are installed on boards.? You might also be able to unsolder the connector from the cable and interface directly to the small PCB that's inside the shell.? Keith has some excellent photos and description of what's in the shell:
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I don't think I would try unsoldering the ribbon itself to connect to your own adapter.? If you look at the photos, it's very fine work and was clearly done at the factory with special soldering equipment and jigs.? Plus this cable, like all the 40-pin cables, is lossy and has a very fine center conductor probably made of nichrome, which is difficult to solder.
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Or just go with one of the cables that has the more common 2x20 on the end that connects to the 5032.
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-mark
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On Thu, Dec 5, 2024 at 02:02 AM, Anders wrote:
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Re: HP141T with multiple sections
Removing the CRT won't make much difference to the weight, most of the weight is in the transformer & plug-ins. Also you will still need most of the electronics for the plug-ins.
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Personally I would make the LCD thingy a completely separate part, as shown in the video.
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David |
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Re: Wanted: Manual for HP 6116A power supply
I second, third and fourth that. Not only are the manuals excellent, but Artek is a good firm. ------------------------ Dave (Nick) Daniel KC0WJN ------------------------ On Thu, Dec 5, 2024 at 09:37 Radu Bogdan Dicher via <vondicher=[email protected]> wrote:
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factory
Jared Cabot
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