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Very Inexpensive 7623A, but Problems
It pays to be methodical (though, in this case, the one getting payed appears to be Mouser): I went back and measured the voltages coming off the (unreg) power supply, and the +40 V rail is also very
It pays to be methodical (though, in this case, the one getting payed appears to be Mouser): I went back and measured the voltages coming off the (unreg) power supply, and the +40 V rail is also very
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Jeff Dutky
· #180006
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TDS544A with strange display
#photo-notice
Siggi wrote: I think that the per-color part of this is probably explained by the order of the color shutter actuation, but I can't quite make it make sense either. If we simply had something that was
Siggi wrote: I think that the per-color part of this is probably explained by the order of the color shutter actuation, but I can't quite make it make sense either. If we simply had something that was
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Jeff Dutky
· #180001
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TDS544A with strange display
#photo-notice
Okay, sorry I didn't read carefully enough. From the documents on TekWiki I'm betting that the color is produced by the "shutter" assembly in front of the CRT, and that the CRT is monochrome. That wou
Okay, sorry I didn't read carefully enough. From the documents on TekWiki I'm betting that the color is produced by the "shutter" assembly in front of the CRT, and that the CRT is monochrome. That wou
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By
Jeff Dutky
· #179967
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TDS544A with strange display
#photo-notice
Do you have a VGA display that you can attach to the rear video output? Do the blue stripes appear on the external VGA display?
Do you have a VGA display that you can attach to the rear video output? Do the blue stripes appear on the external VGA display?
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By
Jeff Dutky
· #179951
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front protective cover for 2455b with dmm
Scott, these do exist, but they are exceedingly rare. I have been searching for one for the past few months, and have only seen them sold along with the scope, and then only a couple of times. I have
Scott, these do exist, but they are exceedingly rare. I have been searching for one for the past few months, and have only seen them sold along with the scope, and then only a couple of times. I have
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By
Jeff Dutky
· #179945
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How to troubleshoot a faulty 7B50 timebase
Could you upload pictures of the malfunction ("all lighting green") and the effect of BEAM FIND ("vertical or horizontal bar")?
Could you upload pictures of the malfunction ("all lighting green") and the effect of BEAM FIND ("vertical or horizontal bar")?
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By
Jeff Dutky
· #179944
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To Beeswax or not to Beeswax: that is the question.
Tom, Sealing wax, according to wikipedia, can contain beeswax. I'm a little surprised that candle wax would be used to try to hold a transformer together, my impression of it is that it is both brittl
Tom, Sealing wax, according to wikipedia, can contain beeswax. I'm a little surprised that candle wax would be used to try to hold a transformer together, my impression of it is that it is both brittl
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By
Jeff Dutky
· #179908
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To Beeswax or not to Beeswax: that is the question.
Oddly, the wikipedia entry does not list any use for beeswax in electronics, either current or historical, similarly the electrical properties of beeswax are not discussed. I'm very curious how beeswa
Oddly, the wikipedia entry does not list any use for beeswax in electronics, either current or historical, similarly the electrical properties of beeswax are not discussed. I'm very curious how beeswa
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By
Jeff Dutky
· #179905
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Very Inexpensive 7623A, but Problems
Harvey, thanks for the explainer, between that and the Theory of Operation section I should be able to figure out what's going on in the -15 V regulator. I went back to the start, found an appropriate
Harvey, thanks for the explainer, between that and the Theory of Operation section I should be able to figure out what's going on in the -15 V regulator. I went back to the start, found an appropriate
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By
Jeff Dutky
· #179898
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Very Inexpensive 7623A, but Problems
Harvey, Thanks for that tip, that really helped me validate the connections to and from the power supply. Between the indicator triangles and my check-in photos I was able to verify that all the cable
Harvey, Thanks for that tip, that really helped me validate the connections to and from the power supply. Between the indicator triangles and my check-in photos I was able to verify that all the cable
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By
Jeff Dutky
· #179830
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Very Inexpensive 7623A, but Problems
A correction: where I wrote that the -15 V rail now measures as -21 V, I should have written that the -18 V rail now measures as -21 V. I appear to have mis-transcribed the spec value for that power r
A correction: where I wrote that the -15 V rail now measures as -21 V, I should have written that the -18 V rail now measures as -21 V. I appear to have mis-transcribed the spec value for that power r
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By
Jeff Dutky
· #179818
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Very Inexpensive 7623A, but Problems
I have added 19 photos to the "Sick 7623A" album showing the current symptoms and the "check-in" photos I took before doing any work on the instrument. https://groups.io/g/TekScopes/album?id=260677
I have added 19 photos to the "Sick 7623A" album showing the current symptoms and the "check-in" photos I took before doing any work on the instrument. https://groups.io/g/TekScopes/album?id=260677
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By
Jeff Dutky
· #179816
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PCB sockets for plug-in xtors/etc.
Dennis Tillman wrote: I'm only guessing that it's silicone. I've not gotten a great look at it, actually. I thought, in the GRiD laptops, that it was a solid seal over the top of the socket, based on
Dennis Tillman wrote: I'm only guessing that it's silicone. I've not gotten a great look at it, actually. I thought, in the GRiD laptops, that it was a solid seal over the top of the socket, based on
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Jeff Dutky
· #179806
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PCB sockets for plug-in xtors/etc.
Dennis Tillman wrote: I have seen something similar on GRiD laptops from the early to mid-80s, used for extra low-profile socket mountings on the CPU and FPU, for example. The original strips had a se
Dennis Tillman wrote: I have seen something similar on GRiD laptops from the early to mid-80s, used for extra low-profile socket mountings on the CPU and FPU, for example. The original strips had a se
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By
Jeff Dutky
· #179801
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Very Inexpensive 7623A, but Problems
Jean-Paul, I will post photos shortly to the "Sick 2365A" album (https://groups.io/g/TekScopes/photos?p=created,,,20,2,20,0&jump=1) I have the service manuals from TekWiki, which purport to be from 19
Jean-Paul, I will post photos shortly to the "Sick 2365A" album (https://groups.io/g/TekScopes/photos?p=created,,,20,2,20,0&jump=1) I have the service manuals from TekWiki, which purport to be from 19
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Jeff Dutky
· #179796
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PCB sockets for plug-in xtors/etc.
Dennis, So it doesn't look like any of the available sockets (at Mouser, at least) have the silicone gaskets that the Tek sockets seem to have. Do you know if that was something Tek did themselves? --
Dennis, So it doesn't look like any of the available sockets (at Mouser, at least) have the silicone gaskets that the Tek sockets seem to have. Do you know if that was something Tek did themselves? --
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By
Jeff Dutky
· #179791
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Very Inexpensive 7623A, but Problems
The replacement parts finally arrived for my repairs to the 7623A. I replaced C811, and Q956 (which I think I killed by accident), and managed (I think) to reassemble everything (I will say that my re
The replacement parts finally arrived for my repairs to the 7623A. I replaced C811, and Q956 (which I think I killed by accident), and managed (I think) to reassemble everything (I will say that my re
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By
Jeff Dutky
· #179734
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O.T. Digital scopes versus Tek analogue.
Bert Haskins responded to: Okay, I'm not disagreeing with you (I'm kind of interested in a good X-Y mode too), but, for curve tracing, aren't there any good, modern, purely digital (as in all data col
Bert Haskins responded to: Okay, I'm not disagreeing with you (I'm kind of interested in a good X-Y mode too), but, for curve tracing, aren't there any good, modern, purely digital (as in all data col
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Jeff Dutky
· #179694
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O.T. Digital scopes versus Tek analogue.
Guessing, without the benefit of actual knowledge (other than what I've seen from tear-downs on YouTube) but modern DSOs, at least the lower end units, seem to be very mixed beasts for repairability:
Guessing, without the benefit of actual knowledge (other than what I've seen from tear-downs on YouTube) but modern DSOs, at least the lower end units, seem to be very mixed beasts for repairability:
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By
Jeff Dutky
· #179669
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Looking to ID a diode in a 1S1 sampling plug-in
(of course I meant to subtract reverse current from forward current)
(of course I meant to subtract reverse current from forward current)
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By
Jeff Dutky
· #179478
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