Basically, it looks as it should, but I think there is a problem
with the amount being displayed. You should have a marker on
each of the 11 divisions on the screen. I don't see them all
the way to the right... Perhaps you need to adjust the horizontal
position control so that the first marker is aligned with the
left most graticule line?
If that is the case, you may have the wrong markers illuminated.
-Chuck Harris
Max Vlasov via Groups.Io wrote:
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Hello Chuck,
I have posted the photos from the CAL01 to the forum:
/g/TekScopes/album?id=74577
Could you, please, have a look and tell me if you see something not right?
I'll have to re-do the CAL01 with 7603 or 7834 scope as a bench scope this evening.
Thank you again,
Maxim
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Re: Loading of 7104 power supply
Ok, thanks - appreciate the knowledge you bring to the group H?kan.
Bob.
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On 10/5/2018 11:25 AM, zenith5106 wrote: On Fri, Oct 5, 2018 at 08:03 PM, bobh@... wrote:
Are the 620's all power supply assemblies a listed category in the RPR or does
RPR only group individual items or parts?? I know it is a column in the list
but are all the 620's on one or several microfiche slides.
The RPR isn't grouped it just lists all P/N's in sequence from 000-xxxx-xx thru 950-xxxx-xx.
In my set, from 1997, 620-xxxx-xx are on pages 28385 thru 28420 = 36 pages.
/H?kan
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Re: Loading of 7104 power supply
On Fri, Oct 5, 2018 at 08:03 PM, bobh@... wrote:
Are the 620's all power supply assemblies a listed category in the RPR or does
RPR only group individual items or parts?? I know it is a column in the list
but are all the 620's on one or several microfiche slides.
The RPR isn't grouped it just lists all P/N's in sequence from 000-xxxx-xx thru 950-xxxx-xx. In my set, from 1997, 620-xxxx-xx are on pages 28385 thru 28420 = 36 pages. /H?kan
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Re: Loading of 7104 power supply
Are the 620's all power supply assemblies a listed category in the RPR or does RPR only group individual items or parts?? I know it is a column in the list but are all the 620's on one or several microfiche slides.
If so, maybe that series would be a good one to ask Dave Brown to scan from microfiche.? But,? I think I used up my request quota on the 151 series.? Although PS's shouldn't be 762 pages.
The advantage of OCR'ing would be you could search the file by model, part number, assembly number.
Bob.
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On 10/5/2018 10:37 AM, zenith5106 wrote: On Thu, Oct 4, 2018 at 07:02 PM, Gary Robert Bosworth wrote:
Also, which of the 7000 Series oscilloscopes use the same power supply as the
7104?
The P/N of the complete P/S is 620-0283-01 or -02. -01 was also used in R7103, 7854 and 7904A.
It was replaced by the -02 which was used in the above plus 7704A B231888 - up and 7934.
/H?kan
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Re: Loading of 7104 power supply
On Thu, Oct 4, 2018 at 07:02 PM, Gary Robert Bosworth wrote:
Also, which of the 7000 Series oscilloscopes use the same power supply as the
7104?
The P/N of the complete P/S is 620-0283-01 or -02. -01 was also used in R7103, 7854 and 7904A. It was replaced by the -02 which was used in the above plus 7704A B231888 - up and 7934. /H?kan
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I emailed the Vintage Tek museum after reading their discussion on the replacement of those ROMs. Hopefully they can program the EPROMs and sell them to me. If not it looks like I'll need an EPROM programmer. The order for all of the main capacitors has been placed so there is no turning back now. Thanks for the input.
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On Thu, Oct 4, 2018 at 02:55 AM, zenith5106 wrote:
On Thu, Oct 4, 2018 at 05:00 AM, lop pol wrote:
It has Mostek MK36694J-5 and MK36693J-5 ROMs. Are these something that in
order to do a proper restore need to be replaced?
IIRC the 468 ROM's came in three revisions, -00, -01 & -02, where
-00 and -01 were Mostek. The -02 had the same digital content as
the -01 but were CY7C264 EPROM's. The Mostek's are unreliable and
for that reason ought to be replaced although replacements could
be hard to find. With an adapter board common 27C64's could be used.
/H?kan
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Thanks for the quick replies.
I own the 7313 and will take $200 for it. Tbe plug ins are worth that.
It works well has low MHz response with current plug ins. Can see way above 50 MHz but of course amplitude is not accurate at high freq.
The 545 is owned by someone else but I THINK he will take $100, maybe less make an offer.
He obtained it from a technician who can no longer use it because of his really bad rheumatoid arthritis.
The teck said it works, can check it further in a few days if anyone is serious.
I plan on going to Bedford IN hamfest tomorrow and will bring both scopes if anyone is really interested.
Wally KC9INK
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Re: Loading of 7104 power supply
Hi Nenad,
Were you able to find exact replacements, including same form factor, for the filter caps in your 7854?
If so do you recall where you bought them?
That would save some of us with 7854s that will need to freshen up our power supplies the time consuming task of locating exact replacement power supply caps.
Thanks,
Dennis Tillman W7PF
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-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Nenad
Filipovic
Sent: Friday, October 05, 2018 8:26 AM <snip> PS: I noticed on my 7854 that PSU tends to switch to overload mode if filtering capacitors are worn out. I recapped mine and since then it has been working without a glitch. Best Regards, Nenad F. -- Dennis Tillman W7PF TekScopes Moderator
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Re: Loading of 7104 power supply
Also, which of the 7000 Series oscilloscopes use the same power supply as the 7104? I think the 7854 uses the same PSU. PS: I noticed on my 7854 that PSU tends to switch to overload mode if filtering capacitors are worn out. I recapped mine and since then it has been working without a glitch. Best Regards, Nenad F.
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Hi Wally, and anyone else in interested in the 545B,
It is quite unusual for Tek to redesign a scope a second time. The 545 was a legendary design and a very successful product. It was one of only a few scopes to be worthy of redesign twice. That is the significance of the "B" at the end of the 545B.
I will be happy to know it is going to someone who appreciates the importance of owning this scope. It was one of the many wonderful Tek scopes I had the opportunity to use in my first real job in a large state of the art electronics laboratory in the late 1960s.
There are so many plugins you can use with it that whoever gets it will have an opportunity to explore a wide range of electronic circuits and signals.
Dennis Tillman W7PF
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-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of
wallydoc via Groups.Io
Sent: Friday, October 05, 2018 7:44 AM
To: [email protected]
Subject: [TekScopes] FS Tex 545 and 7313
I have just repaired a 7313 that I received in return for work. It works
fine and even the store function works Has three plug ins including
differential amp.
Anyone Interested?
Also big old monster Tek 545B with 53C plug in.
I do not know if this one works, can check it out, will be cheap.
I am in Indianapolis . I suppose that these units would be too expensive
to ship.
Wally KC9INK -- Dennis Tillman W7PF TekScopes Moderator
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Hi Wally, Curious what you're asking for both? I'm in NW Cincinnati, and make it to Indy from time to time. Thanks, Kyle -- KSR Amps / Rhodes Amplification, LLC Kyle Rhodes (513) 480-2677 kyle@... On Fri, Oct 5, 2018 at 10:44 AM wallydoc via Groups.Io <wallydoc= [email protected]> wrote: I have just repaired a 7313 that I received in return for work. It works
fine and even the store function works
Has three plug ins including differential amp.
Anyone Interested?
Also big old monster Tek 545B with 53C plug in.
I do not know if this one works, can check it out, will be cheap.
I am in Indianapolis . I suppose that these units would be too expensive
to ship.
Wally KC9INK
|
I have just repaired a 7313 that I received in return for work. It works fine and even the store function works
Has three plug ins including differential amp.
Anyone Interested?
Also big old monster Tek 545B with 53C plug in.
I do not know if this one works, can check it out, will be cheap.
I am in Indianapolis . I suppose that these units would be too expensive to ship.
Wally KC9INK
|
Hello Chuck, I have posted the photos from the CAL01 to the forum: /g/TekScopes/album?id=74577Could you, please, have a look and tell me if you see something not right? I'll have to re-do the CAL01 with 7603 or 7834 scope as a bench scope this evening. Thank you again, Maxim
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Robin,
We should continue this off the group, you can contact me as rogergevans on the well known email beginning with G. If you have working plugins can we just swap mainframes?
Regards,
Roger
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Chuck,
Thank you for your help!
First I did the power supply 10V and DAC adjustment (performed the checks as per the manual). Then did the time marks (I'll upload tomorrow the photos). But then between step 17 and 23 I have failed miserably with all my digital scopes (Tek DSO 3054, LeCroy 9410, Agilent) which couldn't perform the stroboscopic display (the holdoff is not short enough), so I could only superimpose the time marks on the bench scope for the slower frequencies (had to switch off all the fancy features but still can't achieve fast re-triggering). Tomorrow I'll take my very old Tek 7834 eating dust in the celler and will repeat the steps 17 to 23 again in CAL01. Otherwise it is much clear now. Even without correcly overlaying time marks on the bench scope this time the CAL01 have completed and when 2445 is booted I can see that the horizontal timing is accurate.
Also it seems like even the semi-automated calibration procedure is very labor intensive.
Thanks for clarifying how to deal with the overlays. Looks like I can even superimpose the time marks on the center of the screen within the specified accuracy (0.2 square for 2/10 or 1.2 square for 4/28). Seems like I shouldn't get rid of my 7000 series scopes (I just was about to do that) since till this evening I couldn't find the good use for them ;)
Maxim
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Yes, you can calibrate only the part you need, without
having to complete the entire routine. The only restrictions
are that some calibrations rely on other calibrations having
been done, or being good already.
For example, power supply, and DAC accuracy adjustments affect
everything. The CRT adjustments are important pretty early on,
as changing the geometry will change the CRT's sensitivity.
It is not essential that the overlaid waveforms be in the center
of the screen. The important part is they be overlaid, and they
be the specified pulses (eg, 2 and 10, 4 and 28, 3 and 19...) pulse.
Also, you need a bench scope to do the "B" timebase part of the
horizontal calibration. You can also eyeball them, ala the 2465's
instructions. The extra scope allows an enhancement that is somewhat
important to the measurement routines.
-Chuck Harris
maxim.vlasov@... wrote:
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Thank you very much for the detailed answer, Chuck,
So tihs means that actually I can do the calibration in separate steps by running the CALxx procedure from the beginning to the end. This will fix then the FAIL04 problem once all the calibration constants are updated and the checksum is OK for all of them.
Sending the scope from Europe to the US and back is more than 500 USD (including the taxes, customs etc) so its beyond the economical repairs. The battery is good, it's just our lab technician pulled out all the chips in the failed attempt to quickly repair the scope by reseating the ICs and clearly lost all the settings once the memory has lost its power. Then the scope was thrown to the company auction and I scored it for 150$. After that I had to replace the U200 hybrid, opamps around, etc. Looks like someone decided to probe HV with this scope. After recapping the power supply I decided to calibrate it, but I didn't have by that time the time mark generator. So now, I'm better prepared and can go slowly running the CAL routines one by one.
I'm going to re-run tonight the CAL01. Could you, please, tell me whether I always have to join the zoomed time marks around the Y axis in the middle of the screen. Sometimes two zoomed traces disagree more in the middle of the screen, The service manual only precises that the traces must be joined around the division 6 (screen center) only for the step 1. I assume that in order to align the signal timing they have to be precisely aligned at x10 zoom around the screen center (vertical axis). So I'll try re-running the CAL01 with the signal alignment around the screen center.
Thank you again and all the Best,
Maxim
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Re: 465M goes dead and then magically comes back to life.
Have you checked the fuse holder solder joints? On Wed, Oct 3, 2018 at 04:28 PM, <ironcoder@...> wrote:
Yes Dave, I have had fuse holders go iffy on me before. Sometimes replacing a
fuse holder turns into a big project. This fuse holder on the 465M interface
board feels very tight when I snap in a new fuse. I will just have to wait and
see how things go with this.
Michael
Dave
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Re: 465M goes dead and then magically comes back to life.
Ditto on the fuse holder possibly being the problem. Have previously had an issue with fuses making good contact with a holder, or the cap with the socket was never sure which, but wiggling the cap would demonstrate the problem. Ended up just replacing after trying contact cleaner.
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Re: 7B53A seamless modification... Adding Alternate Delayed time base visualization (with trace separation)
Hello Hakan,
It occurred to me to google for "7B53A MOD178H" and look what came up...
This PDF (in TekWiki) not only includes the 178H, but also other mods to the 7B53A.
And the scan is very readable.
Upon further reading, I understood that it doesn't actually cripples the functionality of the x1-x10 (which would be silly), but moves this function to the "MIX" mode button (pull VAR control).
Indeed, the MIX mode loose its place and gets deleted, but anyone would agree that the MIX mode becomes completely obsolete when you have the Alternate time base functionality.
The mod then, uses the X1-X10 panel real estate to add a dual potentiometer, for the trace separation and also to control the intensity of the Dly'd sweep / Intensified portion (which is a really nice feature, but requires the addition of a dual potentiometer to the panel, which I don't think I can do, aesthetically speaking.
Therefore, I`ll probably make a mod of the mod, to implement its design as much as possible, but not adding the Dly'd Intensity control, and using the "Var" control for the trace separation, as it was my original plan.
Kindest Regards,
Fabio
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On Wed, Oct 3, 2018 at 05:41 PM, zenith5106 wrote:
That would be if someone else has better sheet. With mine it was impossible
to get a clear view even on the reader. Usually they are better than this.
/H?kan
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Thank you very much for the detailed answer, Chuck,
So tihs means that actually I can do the calibration in separate steps by running the CALxx procedure from the beginning to the end. This will fix then the FAIL04 problem once all the calibration constants are updated and the checksum is OK for all of them.
Sending the scope from Europe to the US and back is more than 500 USD (including the taxes, customs etc) so its beyond the economical repairs. The battery is good, it's just our lab technician pulled out all the chips in the failed attempt to quickly repair the scope by reseating the ICs and clearly lost all the settings once the memory has lost its power. Then the scope was thrown to the company auction and I scored it for 150$. After that I had to replace the U200 hybrid, opamps around, etc. Looks like someone decided to probe HV with this scope. After recapping the power supply I decided to calibrate it, but I didn't have by that time the time mark generator. So now, I'm better prepared and can go slowly running the CAL routines one by one.
I'm going to re-run tonight the CAL01. Could you, please, tell me whether I always have to join the zoomed time marks around the Y axis in the middle of the screen. Sometimes two zoomed traces disagree more in the middle of the screen, The service manual only precises that the traces must be joined around the division 6 (screen center) only for the step 1. I assume that in order to align the signal timing they have to be precisely aligned at x10 zoom around the screen center (vertical axis). So I'll try re-running the CAL01 with the signal alignment around the screen center.
Thank you again and all the Best,
Maxim
|
zenith5106
Fabio Trevisan