7633 Fast Level Center adjustment
Hi,
I could not find any explanation about how to set this semi-fixed front panel control on the 7633. Manuals say:
? FAST LEVEL CENTER adjustment is provided to separately adjust the fast mesh voltage for the desired tracking of the STORAGE LEVEL, on the two meshes.
? FAST LEVEL CENTER-Adjusts the voltage level of the FAST target relative to the viewing target and, therefore, the tracking of the STORAGE LEVEL for the two targets.
But it is not clear to me how must I adjust it, besides some empirical attempts.
Does someone know more?
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Re: OT: Artek Manuals "Distro"?
All,
I am the licensed reseller / distributor for Artek Manuals on eBay as "Artek Manual Distro" through an agreement with the owner / operator of Artek Manuals. "Distro", short for distributor.
Their website continues as before Dave's passing. eBay, for some unexplained reason, delisted the Artek eBay listings. I have been reposting selected items. The agreement includes compensation back to Artek Manuals. So all is on the up-and-up.
I appreciate the concern of the group and will let Linda know. Dave put in an exceptional level of effort to provide high quality scans, especially HP/Agilent with permission from Agilent. His passing was quite unexpected and a sad loss.
regards, Ron
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Re: 7000 series plug-in contact rating?
Ed,
You have likely seen this already but if not, pages 90-93 of the 7k plugin to mainframe interface offers some operational information but not maximum contact current capability.
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Please disregard. I see where Jon mentioned the "hidden" ones.
Barry - N4BUQ
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Did you include the tantalums on the backplane that are somewhat hidden behind
one of the interface boards (C60, C62, C64, C66)?
Barry - N4BUQ
Yep, as I mentioned that is all out of the machine and I pulled said tants on
the backplane - no love. Which were your bd ones?
I kinda been down these roads... looking for next road :)
- to recap (pun intended)
- - 15 bad
-- to quickly check if a particular board (vert, horiz, cal, Z) I pulled jumpers
to each one by one. no love
- pulled main interface board which as Jon said has tants all over the place for
-15V - I measured as many as I could find - no love at all.
I'm tryign to finish the isolation of SMPS itself VERSUS a shorted element in
the mainframe. I guess Ill try to load down the PSU and see if standing by
itslef its OK or not.
TY for the advice - it seems like I am following the manuals correctly as well
as having read the internet accuratelty for what to do.
Oran- the manuals say to use a variac to decrease input AC voltage to
troubleshoot the SMPS.
Thanks for the help!
|
Did you include the tantalums on the backplane that are somewhat hidden behind one of the interface boards (C60, C62, C64, C66)?
Barry - N4BUQ
toggle quoted message
Show quoted text
Yep, as I mentioned that is all out of the machine and I pulled said tants on
the backplane - no love. Which were your bd ones?
I kinda been down these roads... looking for next road :)
- to recap (pun intended)
- - 15 bad
-- to quickly check if a particular board (vert, horiz, cal, Z) I pulled jumpers
to each one by one. no love
- pulled main interface board which as Jon said has tants all over the place for
-15V - I measured as many as I could find - no love at all.
I'm tryign to finish the isolation of SMPS itself VERSUS a shorted element in
the mainframe. I guess Ill try to load down the PSU and see if standing by
itslef its OK or not.
TY for the advice - it seems like I am following the manuals correctly as well
as having read the internet accuratelty for what to do.
Oran- the manuals say to use a variac to decrease input AC voltage to
troubleshoot the SMPS.
Thanks for the help!
|
7000 series plug-in contact rating?
Does anyone know if there's an official current-carry rating for the 7K main interface connectors. That is, maximum continuous DC through the connector's spring contact into the plug-in's board edge contact, per contact. Only the carry is needed, not the make or break ratings.
I think virtually every commercially made connector type has these and voltage specs too, but since the 7K ones are Tek-made, it may not be so clear. I'm hoping for some internal document or experimenting or experience or other, kind of like the empirically derived 7K power supply and plug-in load characteristics. Anything should help.
I believe a first estimate may be somewhere around 4 amps, since (I think) any one-wide plug-in may have only a single contact for each supply, yet be able to dump an entire supply well over 4A peak for a SMPS supply trying to launch but ticking in a 7XX4 frame, or continuously at the foldback limit in a linear 7XX3. Like say, when there's a shorted Ta cap in a plug-in.
Ed
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Yep, as I mentioned that is all out of the machine and I pulled said tants on the backplane - no love. Which were your bd ones?
I kinda been down these roads... looking for next road :)
- to recap (pun intended)
- - 15 bad
-- to quickly check if a particular board (vert, horiz, cal, Z) I pulled jumpers to each one by one. no love
- pulled main interface board which as Jon said has tants all over the place for -15V - I measured as many as I could find - no love at all.
I'm tryign to finish the isolation of SMPS itself VERSUS a shorted element in the mainframe. I guess Ill try to load down the PSU and see if standing by itslef its OK or not.
TY for the advice - it seems like I am following the manuals correctly as well as having read the internet accuratelty for what to do.
Oran- the manuals say to use a variac to decrease input AC voltage to troubleshoot the SMPS.
Thanks for the help!
|
My 7904 blew tants hidden on the plugins backplane
Remove all PU, side covers, inspection of backplane PCB for tants, probably on -15V bus
Jon
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Minimum 7904 supply currents from H?kan's earlier message:
-50 V: 0.08 A
-15 V: 0.8 A
+5 V: 0.4 A
+15 V: 1 A
+50 V: 0.2 A
+ 130 V: 0.036 A
+5 Lights: 0.3 A
Don't forget to check the caps after the rectifiers but before the regulators. You can go with a DVM across each cap and check for a short, some tantalums on the supply look like rectangular dipped mica capacitors but they are tantalum caps. One of them was bad on my 7904.
Supply resistances measure higher than the troubleshooting manual, likely a difference in DVM used as you also guessed.
Ozan
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On Wed, Jan 8, 2025 at 01:44 AM, William wrote:
Thanks in advance for the excellent help I have received already just by
reading.
In an nutshell: 7904 from fleabay advertised as good work but is not - no
trace no beam find no sawtooth. Seller very kindly offered me partial refund
as seller doesnt want the BA back.
Teardown -> -15V supply at -0.6 V (yes, I know that number ;)) all other
supplies that I had the tools to check are within 1%. Pulled power to each
board 1 by one -> still -0.6V. Of note, pulling Z axis board power beam
unblanked but no sweep or nuthin.
Pulled PS and it is in tik tik mode when disconnected as it should be. It
also goes into tik tik mode if no plugins, which I do not think its supposed
to do.
All supply resistances much much greater than listed in manual - I assume
autoranging DMM is driving the semiconductors different than Tek forsaw a half
century ago
-15V transistor fell apart while desoldering from board - not sure if stigmata
of overheating or I was just cavemanning it. Replaced and replaced its
driver. Still no love.
- Pulled main interface board thinking C60 might be culprit - nope! no short.
Ugh now gotta reassemble.
- Measured resistances of the tantalums on the rectum fryer board - seem all
OK or at the very least not dead shorts.
- have to get it together to test further. I might be able to borrow a
variac. I don't really feel like putting together a fancy dummy load setup
just for this one thing (lets all remember I thought I was buying a working
scope to use on my OTHER projects) but would be willing to spend a little on
some resistors to finish the troubleshooting.
but -17 seems ok and during the burst the - 15 is at about -17. The
waveform, though, isnt pretty as shown in the manual - it looks more like the
-17 or so is actually the envelope of a much higher freq signal.
The ribbon cable ends are turning to dust in my hands.
Any assistance you might offer in next step troubleshooting, or some minimal
load current values to keep it out of burst mode while troubleshooting would
be great help.
Thanks in advance!
Bill
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Re: OT: Artek Manuals "Distro"?
Em 08/01/2025 14:07, Radu Bogdan Dicher via groups.io escreveu: That's right, and it's hard to not make the case that the use of the name
is at least a bit iffy, because of that. It's entirely possible the place
does a lot of repairs where they needed Artek SMs and now they have them,
and they're no longer needed. Not sure how to think through ownership of,
essentially, software, but I guess selling those CDs is within their rights
as they bought them. Or maybe not quite? Not a specialist, so all this is
shooting from the hip, and not meant to be disrespectful in any way.
But no question they are legit Artek CDs, of which I have several. Well, I do a lot of scanning myself () and I may add my 2 cents: Firstly, there is no ownership in scanning. The manuals are sole property of their owners/creators and what we do is gray area. I do that for preservation, I want to have rare manuals avaiable so they are preserved and not lost forever. Also rare books and other documents. But most of the material is copyrighted and Artek or me or whoever scans it isn't the owner of the material, nor has the RIGHTS (mark this word) to sell it. BUT and this is a big BUT, we who scan and preserve materials, use not to sell others' work. Dave had a legitimate "function" - He scanned good quality manuals and you paid for his service of having it scanned. But it gives him no "rights" nor anyone else. As a preserver myself, I prefer to do that for free. All my manuals are free and no one is alowed to ask anything for them, nor put its mark, stamp or web site address on it. But to each, its own. Bottom line: Don't buy schematic CDs. They are all on the web. And if they aren't, put them on. If you are going to pay for it, donate for people who scans for free, or buy from Artek and other sellers who DO LEGIT SCAN WORK instead of leechers who get others' work and just sell it. 73 de PU2SEX Alexandre
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Re: OT: Artek Manuals "Distro"?
That's right, and it's hard to not make the case that the use of the name is at least a bit iffy, because of that. It's entirely possible the place does a lot of repairs where they needed Artek SMs and now they have them, and they're no longer needed. Not sure how to think through ownership of, essentially, software, but I guess selling those CDs is within their rights as they bought them. Or maybe not quite? Not a specialist, so all this is shooting from the hip, and not meant to be disrespectful in any way. But no question they are legit Artek CDs, of which I have several. Radu. On Wed, Jan 8, 2025, 8:52 AM Sigur?ur ?sgeirsson via groups.io <siggi= [email protected]> wrote: On Tue, Jan 7, 2025 at 10:42?PM Dave Daniel via groups.io <kc0wjn=
[email protected]> wrote:
I do NOT know if it is related to ArTek media.
I think the question probably came up because the Artek Manuals Distro
store lists a whole lot of CDs labeled ArtekMedia (
).
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Re: OT: Artek Manuals "Distro"?
On Tue, Jan 7, 2025 at 10:42?PM Dave Daniel via groups.io <kc0wjn= [email protected]> wrote: I do NOT know if it is related to ArTek media.
I think the question probably came up because the Artek Manuals Distro store lists a whole lot of CDs labeled ArtekMedia ( ).
|
Re: OT: Artek Manuals "Distro"?
A Google search for "Artek" yields 335,000 results. Therefore, it's not unusual that others use the word. One hit was a foundation formed in the 1930's. As always, it's prudent to be careful about any entity that you do business with via the internet.
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On Jan 7, 2025, at 19:25 , William via groups.io <whf@...> wrote:
All supply resistances much much greater than listed in manual - I assume autoranging DMM is driving the semiconductors different than Tek forsaw a half century ago Pretty sure mine were in the same ballpark, also measured with autoranging DMM. I might be able to check mine after work, if that would help. - Measured resistances of the tantalums on the rectum fryer board - seem all OK or at the very least not dead shorts. Did you check the ones on the horizontal amplifier and (I think) the calibrator? I think the -15V tantalums are your most likely culprit for the symptoms given. Adam
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Hi, obviously I did all that before I posted. Did you actually read what I posted? Bill
|
For better advice Please post photos to the section, as an album inside and front, back
Get the Tektronix service manual, original, Artek copy, or as pdf ( w140, Tekwiki)
Follow the procedures and troubleshooting flow chart
See previous toptics on 7904 power supply load
Search also EEVblog
Bon chance
Jon
|
Thanks in advance for the excellent help I have received already just by reading.
In an nutshell: 7904 from fleabay advertised as good work but is not - no trace no beam find no sawtooth. Seller very kindly offered me partial refund as seller doesnt want the BA back.
Teardown -> -15V supply at -0.6 V (yes, I know that number ;)) all other supplies that I had the tools to check are within 1%. Pulled power to each board 1 by one -> still -0.6V. Of note, pulling Z axis board power beam unblanked but no sweep or nuthin.
Pulled PS and it is in tik tik mode when disconnected as it should be. It also goes into tik tik mode if no plugins, which I do not think its supposed to do.
All supply resistances much much greater than listed in manual - I assume autoranging DMM is driving the semiconductors different than Tek forsaw a half century ago
-15V transistor fell apart while desoldering from board - not sure if stigmata of overheating or I was just cavemanning it. Replaced and replaced its driver. Still no love.
- Pulled main interface board thinking C60 might be culprit - nope! no short. Ugh now gotta reassemble.
- Measured resistances of the tantalums on the rectum fryer board - seem all OK or at the very least not dead shorts.
- have to get it together to test further. I might be able to borrow a variac. I don't really feel like putting together a fancy dummy load setup just for this one thing (lets all remember I thought I was buying a working scope to use on my OTHER projects) but would be willing to spend a little on some resistors to finish the troubleshooting.
but -17 seems ok and during the burst the - 15 is at about -17. The waveform, though, isnt pretty as shown in the manual - it looks more like the -17 or so is actually the envelope of a much higher freq signal.
The ribbon cable ends are turning to dust in my hands.
Any assistance you might offer in next step troubleshooting, or some minimal load current values to keep it out of burst mode while troubleshooting would be great help.
Thanks in advance!
Bill
|
Re: OT: Artek Manuals "Distro"?
Oh. Yes, right. Faulty memory. DaveD KC0WJN On Tue, Jan 7, 2025 at 23:34 John Griessen via groups.io <john= [email protected]> wrote: On 1/7/25 20:42, Dave Daniel via groups.io wrote:
ISTR ArTek media was located in Texas Minnesota..
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Re: OT: Artek Manuals "Distro"?
On 1/7/25 20:42, Dave Daniel via groups.io wrote: ISTR ArTek media was located in Texas Minnesota..
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Re: OT: Artek Manuals "Distro"?
I would be interested to know the story behind Artek Distro; I also believe that it is a legitimate company; I do NOT know if it is related to ArTek media. ISTR ArTek media was located in Texas before being moved to Florida; maybe it moved back to Texas? I dunno. DaveD KC0WJN On Tue, Jan 7, 2025 at 19:35 Dave Casey via groups.io <polara413= [email protected]> wrote: I suspect the "distro" is legit, is run by a list member, and they'll chime
in shortly to explain. But I don't know these as facts, so I'll hold my
tongue so as not to muddy the waters.
Dave Casey
On Tue, Jan 7, 2025, 1:10 PM Dave Daniel via groups.io <kc0wjn=
[email protected]> wrote:
ArTek manuals (artekmanuals.com) is located in Florida. Artek Distro
appears to be a completely different vendor and an ebay seller which sells
lots of random electronic equipment. I personally would continue to buy
manuals from artekmanuals.com, mostly because I personally knew Dave
Henderson, value the quality of and respected his work and honor his
legacy.
DaveD
KC0WJN
On Tue, Jan 7, 2025 at 15:16 Nick via groups.io <tekscopes=
[email protected]> wrote:
I came across an ebay store named "Artek Manuals Distro", selling Artek
CDs and test equipment. Located in McKinney, Texas. Weren't they based in
Florida before?
Is that a copycat or a legitimate Artek store? And if the former, do
they
have a license to Artek's name and scans?
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Jean-Paul
Alexandre Souza
Tom Phillips