Re: Quoting Prior Messages (Re: [HP-Agilent-Keysight-equipment] Transistors for the A17 voltage regulator 8642B)
I had threading and filtering into folders in ancient Eudora and pine over a decade ago¡ I don¡¯t understand how one can manage without it, and how obsolete of an email client it would take not to
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Kuba Sunderland-Ober
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#92280
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Re: Transistors for the A17 voltage regulator 8642B
I have an update in which I measured the voltages on the assembled A17 regulator board Test points on regulator +50V? - -0.069V +15V? - -0.82V -15V? - -0.27V +5V?? - -0.02V -5V??? - -2.2V J3
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DW
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#92279
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Re: Quoting Prior Messages (Re: [HP-Agilent-Keysight-equipment] Transistors for the A17 voltage regulator 8642B)
On Mon, 29 Oct 2018, Sergey Kubushyn wrote: Sorry for sending it twice, network glitch... > On Mon, 29 Oct 2018, Kuba Ober wrote: > >> Are you using a mail client that doesn¡¯t keep threads together?
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Sergey Kubushyn
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#92278
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Re: Quoting Prior Messages (Re: [HP-Agilent-Keysight-equipment] Transistors for the A17 voltage regulator 8642B)
It looks like you don't understand what mail reader is. Just remember, there are other OSes than Windoze. There are also text mode mail clients that doesn't show all those behemytes of stupid html
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Sergey Kubushyn
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#92277
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Re: Quoting Prior Messages (Re: [HP-Agilent-Keysight-equipment] Transistors for the A17 voltage regulator 8642B)
On Mon, 29 Oct 2018, Kuba Ober wrote: It looks like you don't understand what mail reader is. Just remember, there are other OSes than Windoze. There are also text mode mail clients that doesn't show
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Sergey Kubushyn
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#92276
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Re: HP 8341B Band 3 Un Levelled
I've had a problem similar to yours a few years ago with a 8340B. Swapping modules didn't help. It turned out that some of the feed-through caps (from the modules through the main PCB) had become
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Raymond Domp Frank
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#92275
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Re: Quoting Prior Messages (Re: [HP-Agilent-Keysight-equipment] Transistors for the A17 voltage regulator 8642B)
Are you using a mail client that doesn¡¯t keep threads together? Resending all of that stuff seems wasteful, it¡¯s not as if the previous messages disappear into the void¡ Any sane email client
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Kuba Sunderland-Ober
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#92274
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Re: Quoting Prior Messages (Re: [HP-Agilent-Keysight-equipment] Transistors for the A17 voltage regulator 8642B)
That should have said : I for one just delete threads that DO NOT include prior continuity...more is the loss
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Dave / NR1DX
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#92273
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Quoting Prior Messages (Re: [HP-Agilent-Keysight-equipment] Transistors for the A17 voltage regulator 8642B)
_*AMEN ! *_ David K , Mr List Owner: One of things that changed from Yahoo to groups .IO. IN yahoo when using the website interface? it automatically included the prior message(s) when replying, with
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Dave / NR1DX
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#92272
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Re: HP 8341B Band 3 Un Levelled
Look at the YTO alignment - put a detector on it and look at slope of RG output (unleveled). If line is relatively smooth, alignment may work, if you see "squiggles" possible YTO problem (still try
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Bruce
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#92271
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Re: HP 8341B Band 3 Un Levelled
Check for AC ripple on the power supply rails.
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PAUL KOBY
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#92270
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Re: Transistors for the A17 voltage regulator 8642B
This is the problem when people insist on not quoting the original message and appropriate replies. A little net etiquette goes a long way and reduces questions and confusion. Glenn
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Glenn Little
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#92269
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Re: HP 8341B Band 3 Un Levelled
I didn't have this specific one but I did have a similar issue with 8340B going unleveled in Band 2 - The solution to stop the unleveling (but not to get the output back into spec) was to reload the
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Tony Goodhew
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#92268
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Re: Transistors for the A17 voltage regulator 8642B
I think 4401 is a typo -- it is a TO-92 transistor and original post was about 2N4101 in TO-66 package: pdf.datasheetcatalog.com/datasheets/newjerseysemiconductor/2N4101-2N4102.pdf There is no 2N4401
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Sergey Kubushyn
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#92267
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Re: Transistors for the A17 voltage regulator 8642B
Note that the 1884-0065 is not shown as identical to the 2N3670 in the HP transistor cross references, so it may be a selected 2N3670. Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA
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Dale H. Cook <bridgewaterma@...>
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#92266
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Re: HP 8341B Band 3 Un Levelled
Afternoon HP Group Trying to sort our HP8341B 20GHz Sweeper but Problem with Band 3 13.5 GHz ¨C 20 GHz Un-Levelled Light is ON . Setting 0.0dBm Level on Lower Bands is OK (CW Mode) but Band 3 Levels
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MARC CHRISTIAN
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#92265
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Re: Transistors for the A17 voltage regulator 8642B
I had several fuses on A18 blown as a result of the misaligned connector to A17, I replaced them all. One of them was hard to get which was a 1/4 ampere fuse. I am currently reassembling A17 as the
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DW
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#92264
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Re: HP8663A Power supply, was: Firmware difference
Hi Scott Thanks for your input, But the 8663A originally has a SMPS, same PSU thats in the 8662A. Three of the voltages, -40V, -10V and +20V go trough a linear regulator board, that I do have, and
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Askild
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#92263
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Re: Transistors for the A17 voltage regulator 8642B
I assume you have checked all the 5 fuses on the A18 board? If the fan works it means one of the negative supplies is ok (pre-regulator at least) but there are 4 other fuses measuring on the large
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amirb
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#92262
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Re: Transistors for the A17 voltage regulator 8642B
I will have to get back on what voltages I measured, however at the time of the incident which was some time ago, I recall from memory the fan came on when I pushed the power button but all the LED's
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DW
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#92261
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