Re: HP8563 HV supply repair
Thank you for your description and great photos. I have rewound transformers, the key is being able to open them up to where you can remove the old windings and do the rewinding, while counting turns
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Peter Gottlieb
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#95396
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Re: 16900A cleanup and modernization experience including installation notes!
Grant, Please see responses in-line. That worries me as someone who runs their own mail server(s). Is it because you didn't change the groups.io deformation of my email address that used the = sign?
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Keith Monahan
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#95395
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Re: 8753ES YIG oscillator circuit WCA
Same here! Thanks so much for your ESSENTIAL help! Peter
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Peter Gottlieb
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#95394
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Re: 16900A cleanup and modernization experience including installation notes!
<keith@...> wrote: I took a look at the 16903A on my bench at the moment. The driver and .INF file that are preinstalled only include PCI Device & Vendor ID matches for the
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Glen Slick
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#95393
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Re: 16900A cleanup and modernization experience including installation notes!
Glen, Yeah, I was sent 16900-14121.ISO, and 16900-14122.ISO (for the BIOS upgrade). That's all I really needed for the 16900A.
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Keith Monahan
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#95392
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Re: 16900A cleanup and modernization experience including installation notes!
Glen, Thanks again for your comments. Responses-inline. Yeah that's what you had said on the previous thread, which is why I opted for a Sil3114A. Surely the drivers are the same or close for the 3112
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Keith Monahan
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#95391
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Re: 16900A cleanup and modernization experience including installation notes!
Debugging I2C communications between microprocessors: 8 channels for data, roughly 8 channels for status (start/stop/first byte, ack/nak, etc per byte) 8 channels (roughly) for message byte count,
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Harvey White
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#95390
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Re: 8753ES YIG oscillator circuit WCA
That's great ... for you. Not so great for me. Now I have no reason not to work on my taxes. V.
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pianovt
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#95389
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Re: 8753ES YIG oscillator circuit WCA
Test 48 now passes.? The analyzer seems to be operating correctly! Wow. I'm going to need to do a writeup on what I found; what was significant and what wasn't, so this can be useful for others in
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Peter Gottlieb
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#95388
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Re: 8753ES YIG oscillator circuit WCA
I looked and looked and turned up a K&L 2 GHz LPF. The procedure is not the clearest but I identified what seemed like the right spur, the screen looked somewhat like the one shown, and with that one
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Peter Gottlieb
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#95387
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Re: 8753ES YIG oscillator circuit WCA
The manual says this: If you have a 1 GHz low pass, try it. I think I once did it with a 1.8 GHz low pass. Note, there is a filter-less Test 54 procedure in the manual too, but it looks a lot less
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pianovt
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#95386
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Re: 8753ES YIG oscillator circuit WCA
Ok, I will do this test. Where can I find the actual specs for this filter?? Online I see reference to it being a 1.9 GHz LPF, in the manual it shows in in a diagram as a 4.1 GHz LPF, and the other
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Peter Gottlieb
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#95385
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Re: 8753ES YIG oscillator circuit WCA
You do need to check that before you do more esoteric troubleshooting. If the 3.8 GHz oscillator is off, then for a given YTO frequency the IF will be off too. Too much IF error, and the YTO loop will
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pianovt
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#95384
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Re: 8753ES YIG oscillator circuit WCA
I used a Mini Circuits SLP-1200 filter. It worked fine - the spurs were easily visible. I paid about $25 for it on ebay, but even new from Mini Circuits, they are less than $40.
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Orin Eman
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#95383
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Re: HP5335A fan replacement
Dear All, I agree with Dave; flow at the required back pressure is what counts. If the fan design is not suitable, the hurricane of free air flow drops to a whisper when the fan is installed.
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alwyn.seeds1
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#95382
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Re: 16900A cleanup and modernization experience including installation notes!
Keith, I wasn't able to send this off list, but I'm curious about one (at least initially) thing: * I replaced the spinning HDD with a modern SSD. I'm sure the I'm guessing the original drive was
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G Hopper, KB7WSD
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#95381
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Re: 8753ES YTO freq vs. Main Coil mA
I checked the FM coil drive and it is right about at zero so that seems like it's not the issue. Nobody seems to know how the firmware works so we are left to guess and try things.? There is some
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Peter Gottlieb
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#95380
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Re: 16900A cleanup and modernization experience including installation notes!
<keith@...> wrote: I finally found my recovery DVDs. The DVDs that I received as physical copies from Agilent in the "Part Number: 16900-68722 16900A/16902A Recovery DVD Kit"
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Glen Slick
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#95379
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Re: HP8563 HV supply repair
Hello, OK, so all caps and diodes turn out to be functional - this means the transformer is arcing :-/ The board was rebuilt nevertheless to do some experimentation. I set up a driver similar to the
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Staffan
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#95378
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Re: 8753ES YIG oscillator circuit WCA
I don't have the required low pass filter so can't do that step. What will happen if that's messed up?
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Peter Gottlieb
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#95377
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