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Re: Service manual scan post processing

 

I just saw John's post. I forgot to add to my earlier post (below) that I also convert all documents that I scan to OCR format as well.

I do not intend for this follow-up post about my omission to be any comment, observation, endorsement or criticism about John's post.

DaveD
KC0WJN


On Mon, Feb 17, 2025 at 10:14 Dave Daniel via <kc0wjn=[email protected]> wrote:
I usually scan the manual pages at 1200 or 600 dpi to PDF form and save them. Then if I want to load them on a reading device or share them, I'll use Adobe to downsample the file(s) to a lower resolution, usually 300 dpi.

DaveD
KC0WJN


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Re: Service manual scan post processing

 

This +1.

600dpi, G4 compression. (Not JPEG compression -- Never JPEG)

I've got some terrible Linux scripts that use NETPBM/ImageMagick/Tiff
tools to build PDFs for the few I've ever scanned, but the process
varies greatly for every different document.

On Mon, Feb 17, 2025 at 10:14?AM Dave Daniel via groups.io
<kc0wjn@...> wrote:

I usually scan the manual pages at 1200 or 600 dpi to PDF form and save them. Then if I want to load them on a reading device or share them, I'll use Adobe to downsample the file(s) to a lower resolution, usually 300 dpi.

DaveD
KC0WJN


On Mon, Feb 17, 2025 at 09:42 Peter Brown via groups.io <peter@...> wrote:

I have recently been scanning sections of microfiched service manuals for a couple of group members using a Canon MS-800
There is a significant tradeoff between file size and readability (especially with circuit diagrams)
To simplify the scanning process I have been acquiring everything at maximum equipment resolution but this leads to files that might be 200Mb+ per fiche
These are unwieldy but get the job done

Does anyone in the group have experience with tools that might be used to post process these scans to reduce size whilst maintaining small font fidelity?
Any recommendations?
Re: Service manual scan post processing

 

Hi John,?sounds interesting.
Would you be interested in running a few sample pages through the process?
Peter
Re: Service manual scan post processing

 

We switched from the exorbitantly priced Adobe to PDF-XChange several years ago at work (and me personally) and could not be happier.? Excellent and very functional product at 60-70 USD per user.
?
?
Again, highly recommended.
?
Hal
Re: Service manual scan post processing

 

I'm hesitant to bring this up because I'm only just barely beginning to understand it and create a workflow, but as an alternative to Adobe, there is a Google Cloud "Vision" API that does OCR of PDF files. According to ChatGPT, it does a better job than the various open source tools would, though I don't know how it compares to Acrobat.

You need a Google cloud or workspace account, and from there you set up a cloud bucket to hold the raw PDFs, and then create an API Key to the Vision API. Then a Python script can call the Google APIs to trigger conversion of the PDF to a text only document. Most of the pain is getting the bucket and API set up with the right permissions and account info.

Believe it or not, I used ChatGPT to walk me through the whole process and even write the Python script! (Which I'm happy to share.)

Google lets you process 1000 pages per month for free, and it's an additional $1.50/1000 pages thereafter. But I found that my Google Workspace account gave me a $300 credit, so I can do a lot of conversion before I have to pay any real money.

Anyway, this may be too far down the rabbit hole, but looks like it would work well for processing large numbers of documents automatically; even at $1.50 per thousand pages, it's pretty inexpensive.

John
----

On 2/17/25 10:13, Peter Brown via groups.io wrote:
Thanks, Alexandre? I will take a look.
Seems like Acrobat Pro v11 is no longer supported? - any idea experience of their current product?
Re: Fan and ball bearings on 8340/8341 Sweep Generators

 

On Mon, Feb 17, 2025 at 12:18 AM, Calvin Guan wrote:
Is there a way to somehow remove the seal and re-grease the bearings?
Yes. and that's often your very best solution.
?
Grease is a mixture of oil and a soap thickener.? The soap is simply a medium that slowly dispenses oil over time, keeping the bearing lubricated. Old grease may have dispensed all its oil and may be useless by now. Cleaning out the old dried-up grease and replacing it with fresh is often possible and effective. Keep in mind that for a small bearing like this, you'll want a rather thin (not too viscous) high quality grease. Don't use too much grease. When run, the bearing should be able to push most of the grease out of the way. This is called channeling. The grease that's out of the way will continue to shed oil, which will reach the bearing races and do it's job there.
?
The ZZ on the end of the bearing number indicates 2 seals, one on each side. They can usually be pried out and pressed back in. In the worst case, if you damage a seal, just install the bearing with the damaged/missing seal facing the "clean" side of the installation.?
?
The C3 clearance shown for the replacements you mention is a medium clearance for a bearing. It is likely that Etri knows exactly how much clearance works well in their fans and has specified lower clearance bearings, C1 or C2. Some manufacturers have special grades for electric motor bearings, which would be appropriate here, but getting the right clearance will make for quieter running, which makes relubing the old bearings look like an even better option.
?
While it's possible that there's actual surface damage to the old bearing races or balls, this is extremely unlikely for loads this small.
?
Interesting that your cheap Amazon replacements are so poorly made that most of them won't even fit on your shaft. Those are incredibly poor tolerances.
?
--
Jim Adney
Madison, WI USA
Re: Service manual scan post processing

 

Check ebay, etc. to see if someone is selling an older copy.

I've been using Acrobat X (10) for a long time with no proplems.

DaveD
KC0WJN


On Mon, Feb 17, 2025 at 10:13 Peter Brown via <peter=[email protected]> wrote:
Thanks, Alexandre? I will take a look.?
Seems like Acrobat Pro v11 is no longer supported? - any idea experience of their current product?
Re: Service manual scan post processing

 

I usually scan the manual pages at 1200 or 600 dpi to PDF form and save them. Then if I want to load them on a reading device or share them, I'll use Adobe to downsample the file(s) to a lower resolution, usually 300 dpi.

DaveD
KC0WJN


On Mon, Feb 17, 2025 at 09:42 Peter Brown via <peter=[email protected]> wrote:
I have recently been scanning sections of microfiched service manuals for a couple of group members using a Canon MS-800
There is a significant tradeoff between file size and readability (especially with circuit diagrams)
To simplify the scanning process I have been acquiring everything at maximum equipment resolution but this leads to files that might be 200Mb+ per fiche
These are unwieldy but get the job done
?
Does anyone in the group have experience with tools that might be used to post process these scans to reduce size whilst maintaining small font fidelity?
Any recommendations?
Re: Service manual scan post processing

 

Thanks, Alexandre? I will take a look.?
Seems like Acrobat Pro v11 is no longer supported? - any idea experience of their current product?
Re: Service manual scan post processing

 

I scan a lot of manuals, pdfize it and thrown in my esquemateca (link in my sig)

I use Adobe Acrobat Pro (I believe V11), using low compression and clearscan. The output is great. Remember to mark the option "full page on screen" in properties before saving.

---8<---Corte aqui---8<---

- High quality schematics and service manuals FREE scanned by me
---8<---Corte aqui---8<---


On Mon, Feb 17, 2025 at 11:42?AM Peter Brown via <peter=[email protected]> wrote:
I have recently been scanning sections of microfiched service manuals for a couple of group members using a Canon MS-800
There is a significant tradeoff between file size and readability (especially with circuit diagrams)
To simplify the scanning process I have been acquiring everything at maximum equipment resolution but this leads to files that might be 200Mb+ per fiche
These are unwieldy but get the job done
?
Does anyone in the group have experience with tools that might be used to post process these scans to reduce size whilst maintaining small font fidelity?
Any recommendations?
Service manual scan post processing

 

I have recently been scanning sections of microfiched service manuals for a couple of group members using a Canon MS-800
There is a significant tradeoff between file size and readability (especially with circuit diagrams)
To simplify the scanning process I have been acquiring everything at maximum equipment resolution but this leads to files that might be 200Mb+ per fiche
These are unwieldy but get the job done
?
Does anyone in the group have experience with tools that might be used to post process these scans to reduce size whilst maintaining small font fidelity?
Any recommendations?
Fan and ball bearings on 8340/8341 Sweep Generators

 

Just want to share my experience dealing with my noisy fan on my 8340s.
?
One of my 8340s started to develop loud fan noise to the point I need to do something. The fan is an ETRI 148VP 028030 AC fan. I took it apart, there are 2 miniature metal seal ball bearings. The mark on the bearing reads "ADR FRANCE Y3/16Z".? It's an unobtanium. After a lot of googling, it suggests it's a R3ZZ bearing. I measured and confirmed the demission.
?
I then order some R3ZZ bearings from Amazon, it's a 20-piece pack. Out of 20 bearings, only 4 will fit into the shaft, and it's loud as hell. So the cheap bearings one could easily buy is a no go. Don't even waste your time.
?
When I work on cars, I know NSK makes good ball bearings. They do have R3ZZ bearings but certainly not cheap. Does anyone have experience with NSK or other high quality miniature bearings?
?
Is there a way to somehow remove the seal and re-grease the bearings?
?
Regards,
Calvin?
?
Re: Looking for RF Limiter specs

 

Dave, the first place I would look would be in the HP, Agilent, Keysight Microwave Accessory catalog. Probably looking at several years from 1990’s through 2006 will help you. All 5086-xxxx are listed as parts for instrumentation (not spec’d), they have equivalent model nos. listed in the Microwave Accessory (MA Cat) catalog (these are spec’d). Some of the catalog years also listed the part nos., but not always.
You will have to look at the instrumentation circuitry to get a rough idea of the frequency range, power level, etc. to match that instrument part no. to an instrument no. in the MA Cat.

Don Bitters
Re: 5345A electronic counter *restoration adventure*

 

After reading a little more, I discovered that the clock signal for the display is not generated in A15, but in A14, specifically in U13 (pn 1820-1194 or 74LS193 up/down binary counter) . This signal is the result of divide by 64 the decimal point signal to use it for refresh the display.
?
I leave you the high quality diagrams of A14 and A15. I have put them together, because in the Artek manuals they are divided and it is very uncomfortable to explore them.

A14 qualifier schematic merged.jpg
A14 qualifier schematic merged.pdf
A14 qualifier schematic merged.pdf
A15 schematic complete.jpg
A15 schematic complete.pdf
A15 schematic complete.pdf

Re: HP 8563E Shows Signal Present at 100MHz and below without an Input

 

What marker frequency do you get on the 0dBm signal?
It sounds like you are looking at the LO feed through signal, if so the marker on peak signal will be 0 MHz @ 0 dBm.
What do you see if you do an instrument preset (green button)?
At turn on, what is the start frequency? What is the stop frequency? With cal signal connected, can you run the self cal procedure? What happens when you narrow the span to 100, 10, 5.01, 5.00, 1 MHz, and 100KHz? Do it with the phantom signal, then with the cal signal. Cal signal 300 MHz @ -10 dBm
Please report back your findings.

Don Bitters
Re: IPA type for 3.5mm connector cleaning

 

On Sun, Feb 16, 2025 at 07:51 PM, David Speck wrote:
Isopropanol (Often sold as rubbing alcohol) is very definitely toxic,
and does not require denaturing.
Non-the-less, the label on my CVS brand isopropyl alcohol clearly states that it has a bitterant added to it, and it does leave a residue.
Re: Agilent 8753ES P? and up arrow on left side of display ?

 

The up arrow means fast sweep mode
P? I found to mean unlevelled power at the start or end of the sweep.

Perhaps the power settings are causing it to be out of range at the start or end of the sweep.

Considering the noisy trace, the red error message - it looks like it is not locked.
Maybe it is just not able to phase lock due to the power being set too low.
- is that possible on a good 8753ES with a built in test set? (assuming it is not option 011)
Of course it could be a bad YIG too

Details here page 44 (1-8)


On Mon, 17 Feb 2025 at 13:37, Hank WD5JFR via <kolesnik=[email protected]> wrote:
Here's a pic of the up arrow & P?.. What do they mean?? If I look closely I can see in red what might be the beginning of the word CAUTION. Any ides appreciated.
Thanks
Hank
Re: IPA type for 3.5mm connector cleaning

 

There have been a number of recent posts about various alcohols for cleaning.

I wonder if there has been confusion between ethanol (EtOH) (grain alcohol) and isopropanol.? When distilling? grain mash, the best alcohol concentration you can get is about 70% EtOH and 30% water.? To get 99% EtOH, like Everclear, you have to dry the EtOH / H2O mix with a desiccant like silica gel.? 99% EtOH will avidly absorb water from the atmosphere until it reaches the 70/30 ratio again.

If EtOH is sold without a liquor tax stamp, it is denatured with something like Methanol, isopropanol, acetone, or MEK to keep it from being consumed internally.

Isopropanol (Often sold as rubbing alcohol) is very definitely toxic, and does not require denaturing.

Methanol (wood alcohol) is also toxic, and causes blindness if ingested in a significant quantity.? Methanol comes off the fermented mash in the early stages of distillation, in the "heads", and is supposed to be discarded.

Dave

On 2/16/2025 6:39 PM, Steve Byan via groups.io wrote:
The 91% isopropyl at my CVS has a bitterant added to it to prevent people from drinking it. It leaves a white residue behind. Since discovering that, I use only 99% isopropyl. Try asking the pharmacist for the 99% variety, some pharmacies stock it. Otherwise you can buy it from electronics distributors such as Mouser and DigiKey.
Re: Agilent 8753ES P? and up arrow on left side of display ?

 

Here's a pic of the up arrow & P?.. What do they mean? ?If I look closely I can see in red what might be the beginning of the word CAUTION. Any ides appreciated.
Thanks
Hank

Screenshot 2025-02-16 at 5.05.22 PM.png

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