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Re: Front panel knob removal on 2225 (or 2xxx series)?
Roy Morgan
Inspired by watch repair methods:
A couple pieces of hacksaw blade, de-toothed and shaped on a grinding wheel, then bent into short armed L shape, could make a fine pair of levers to get the knobs free. Apply pressure equally on both sides, with the tips well in toward the shaft/center of the knob. Fabric or even paper towel layered under the pivot point prevents panel damage. Roy On Feb 23, 2019, at 6:21 PM, Chuck Harris <cfharris@...> wrote:Roy Morgan K1LKY since 1958 k1lky68@... |
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11801 and other 1180XX Sampling Scopes.
Hi Reginald and others,
I looked at ended eBay Auctions and assume the 11801 you bought is the one which auction ended on March the 7th. As far as I know all 11801 and 11802 (the Monochrooms) Models have a Fast Rise Calibrator (with the Gold Plated APC 3.5mm Female Connector) build in. This is the same Pulser as used in (one half of) the SD-24 and the 067-1338-XX Calibration Step Generator. Some early CSA803's also have it. With respect to the CSA's. B's are never produced and all types have a Color Display. Color 11801's exist in the A,B and C variety. Sometimes you can be lucky. There are 067-1338-XX'a and SD-24's with a Calculated Risetime of 11/12ps. Nice to see their Pulse on a SD-30/32. Intriging is the fact that for the "slow" Heads an 067-1338-XX is used for evaluating their Risetime (see SD Service Manuals), but not for the SD-32 (and I assume also for the SD-30). Greetings, Egge Siert |
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TM504 backplane repair
I have a TM504 where contact B22 on the high-power compartment connector has got mangled. It can be seen that it is sitting badly and maybe shorting to A22. I know that this connector isn't used very frequently, but I was hoping to use my PS503A in that compartment to take advantage of the 1A output. I have obtained a brand-new connector (#131-1078-00) and was hoping to be able to use it to effect a repair. I think I have a number of options:
a) Unsolder the entire faulty connector and replace it with the new one - this looks like a formidable task, since there are a total of 56 pins to unsolder and re-solder and access isn't straightforward but it would be the most ideal option, I think. Unfortunately I don't have a de-soldering tool, only a solder-sucker and some poor de-soldering braid (I suppose I could buy a de-soldering tool). b) Somehow remove the faulty contact and replace it with a good one from the new connector. This would be fine, but it doesn't look easy because of the way the contacts are secured in the new connector, they are not easy to remove as they are retained by way of a punched indentation which has resulted in a raised "dot" on the other side. I have tried crushing this down, but it isn't easy. If the mangled contact in the existing connector is retained in the same manner, I can't see how removal can be managed. c) Just remove the mangled contact by "brute force and ignorance" and forget about its function for the PS503A (it is -V output) . This wouldn't be ideal but would probably be functional, even though it would irritate me as being imperfect. d) disconnect the electrical connection to the faulty contact on the TM504. I don't like this idea at all. e) disconnect the electrical contact on the PS503A. I like this option even less than (d). Does anyone have any experience of doing such a repair or any other/better ideas? TIA, Colin. |
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Re: vintageTEK museum releases Replaceable Parts Registry (RPR)
On Sat, Mar 16, 2019 at 6:04 PM Craig Sawyers <c.sawyers@...> wrote: The hard work that you are doing on this is awesome in the extreme - thank |
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Re: vintageTEK museum releases Replaceable Parts Registry (RPR)
Craig Sawyers
The hard work that you are doing on this is awesome in the extreme - thank you!
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Craig -----Original Message----- |
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Re: 11801 diagnostic help
Albert,
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Thanks. The exit and debug buttons are the only ones that are not active when it stops. Setting "stop on error" off has no effect. With NVRAM replacements on the way and no service data yet, I think I'll wait until I get the chips and the correct manual. I'd like to have it working properly and passing all the diagnostics before I plug in the SD-22s. No sense getting in a hurry and causing extra problems. The only boards with identifying labeling are two memory boards and a waveform compression board. IIRC from when I removed the boards and reseated them, two of the boards don't have any silkscreen labeling at all. The fabrication is very different from the ones made by Tektronix. Once I have the chips and the manual I'll take it apart, identify the boards and label them. I also plan to copy all the ROMS while I have it apart. Despite their age they are still very impressive instruments. I also plan on scanning the manuals I get and sending them to the repositories. Reg -------------------------------------------- On Sat, 3/16/19, Albert Otten <aodiversen@...> wrote:
Subject: Re: [TekScopes] 11801 diagnostic help To: [email protected] Date: Saturday, March 16, 2019, 3:14 PM Hi Reg, IIRC you can exit the Extended Diagnostics screen by pressing the Exit touch-screen field two times. Another possibility to have the instrument at least doing something is to bypass the Self test and Extended Diagnostic tests by setting jumpers J712 and J713 on the I/O board to the 0 position. These jumpers are difficult to reach with the board in situ, I found it easier to remove the board and then change the jumper settings. Albert On Sat, Mar 16, 2019 at 02:31 PM, Reginald Beardsley wrote: > > Because of the E5622 error I can't exit the extended diagnostics. > > Reg > |
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Re: 11801 diagnostic help
Hi Reg,
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IIRC you can exit the Extended Diagnostics screen by pressing the Exit touch-screen field two times. Another possibility to have the instrument at least doing something is to bypass the Self test and Extended Diagnostic tests by setting jumpers J712 and J713 on the I/O board to the 0 position. These jumpers are difficult to reach with the board in situ, I found it easier to remove the board and then change the jumper settings. Albert On Sat, Mar 16, 2019 at 02:31 PM, Reginald Beardsley wrote:
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Re: 11801 diagnostic help
It's the 11801C manual despite what it says on the website. It's enough different I can't even Identify the boards using it.
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My original problem is solved and I have NVRAM replacements en route from the UK. So in 8-10 days I'll be able to resume work. Hopefully with 11801 manuals in hand rather than manuals for later variants. -------------------------------------------- On Sat, 3/16/19, Bob Koller via Groups.Io <testtech@...> wrote:
Subject: Re: [TekScopes] 11801 diagnostic help To: [email protected] Date: Saturday, March 16, 2019, 9:46 AM At KO4BB there is the factory diagnosis manual. Pretty cryptic, but has lots of information. Service manuals are available, but no schematics.. |
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Re: 11801 diagnostic help
Albert,
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The reseating resolved it not getting past the power on test. I've got NVRAM replacements on the way from the UK courtesy of another member of the group who got the last two that RS had in stock. I've not yet been able to find an 11801 user manual or service manual. There are a couple of the latter on eBay, but I've still not verified they are for the 11801. There are no copies of either on the internet. I spent several hours running into incorrectly labeled copies of the 11801C manual. It's a good bit different from the 11801. Because of the E5622 error I can't exit the extended diagnostics. Someone else reported an on time of 30,000 hours. It may well be that they were being used to monitor data links with the screen brightness turned down and infinite persistence. i can easily see someone doing that at the head end of a subsea cable or satellite link. Reg -------------------------------------------- On Sat, 3/16/19, Albert Otten <aodiversen@...> wrote:
Subject: Re: [TekScopes] 11801 diagnostic help To: [email protected] Date: Saturday, March 16, 2019, 5:14 AM Hi Reg, The first thing I look at is the total Ontime and power-ups count. I have seen11801x/CSA803xx with useful display but? Ontime of over 140 khrs. That must be due to some out-of-range condition; the Ontime also doesn't get updated any more. I'm curious to hear what your 11801 reports. I also have a CSA803 with a very crisp display, Ontime just a few hundred hours and perfectly clean inside. As to the battery Error, this error can show up intermittent. So it's not really sure that reseating some components solved your problem. Albert |
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Re: 11801 diagnostic help
Hi Reg,
The first thing I look at is the total Ontime and power-ups count. I have seen11801x/CSA803xx with useful display but Ontime of over 140 khrs. That must be due to some out-of-range condition; the Ontime also doesn't get updated any more. I'm curious to hear what your 11801 reports. I also have a CSA803 with a very crisp display, Ontime just a few hundred hours and perfectly clean inside. As to the battery Error, this error can show up intermittent. So it's not really sure that reseating some components solved your problem. Albert |
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Re: 11801 diagnostic help
Be careful what you wish for. Now I need to build a pulse generator with a fast enough edge to test it.
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I am still a bit amazed I was so lucky. though for a couple of hours I was going, " What have I got myself into?" I bought it on the assumption it would be a fairly easy repair. I tried to build a fast edge pulser using a clock chip and the fastest logic I could get 25 years ago. I thought at the time I had failed miserably, but I tested the units recently and found that the apparent failure was because the EE at work who was helping me test it and I both failed to set the 485 to 50 ohms. The edge is within the spec for the logic I was using to drive the output. I built it for calibrating my 465 and Dumont 1060. As luck would have it, I picked up a Tek 106 for $10-15 which solved my problem. I have a pair of 106s I need to test and sell. They may be old, but for a 100 MHz scope they do the job. Not that there's much you can adjust on a DSO. Have Fun! Reg -------------------------------------------- On Fri, 3/15/19, Jim Ford <james.ford@...> wrote:
Subject: Re: [TekScopes] 11801 diagnostic help To: [email protected] Date: Friday, March 15, 2019, 6:50 PM I'm envious of your scores!? Some day I will get back into owning and operating 11000 series gear....Jim Ford?Sent from my Verizon, Samsung Galaxy smartphone |
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Re: 11801 diagnostic help
I'm envious of your scores!? Some day I will get back into owning and operating 11000 series gear....Jim Ford?Sent from my Verizon, Samsung Galaxy smartphone
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-------- Original message --------From: "Reginald Beardsley via Groups.Io" <pulaskite@...> Date: 3/15/19 3:48 PM (GMT-08:00) To: [email protected] Subject: Re: [TekScopes] 11801 diagnostic help No one in the US will have the ST part in stock until June!? But someone in the UK has offered to get a couple for me there.? I bought the scope for $100 plus $85 shipping because I knew what the E5622 error was.? And I dealt with replacing the Dallas part in a Sun workstation.Reseating all the connectors a 2nd time seems to have done the trick and I can navigate around the extended diagnostics with the touch screen.? I got a pair of SD-22s for $150 and an extension cable for $100, so if the SD-22s are OK or are repairable I'll have it up and running for less than $500 which is pretty cool. The screen is clean and crisp.? No burn.I still want to get a complete set of manuals for the 11801, but so far the 11801A version is as close as I can get.? I do wish people would label things properly.? Once I get proper manuals I'll scan them and send them to all the archives.I'm really not sure what I have yet.? I've got 6 cards in the bay behind the CRT, but I was not able to learn anything about the memory expansion board from the diagnostic screen.Have Fun!Reg
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Re: 11801 diagnostic help
No one in the US will have the ST part in stock until June! But someone in the UK has offered to get a couple for me there.
I bought the scope for $100 plus $85 shipping because I knew what the E5622 error was. And I dealt with replacing the Dallas part in a Sun workstation. Reseating all the connectors a 2nd time seems to have done the trick and I can navigate around the extended diagnostics with the touch screen. I got a pair of SD-22s for $150 and an extension cable for $100, so if the SD-22s are OK or are repairable I'll have it up and running for less than $500 which is pretty cool. The screen is clean and crisp. No burn. I still want to get a complete set of manuals for the 11801, but so far the 11801A version is as close as I can get. I do wish people would label things properly. Once I get proper manuals I'll scan them and send them to all the archives. I'm really not sure what I have yet. I've got 6 cards in the bay behind the CRT, but I was not able to learn anything about the memory expansion board from the diagnostic screen. Have Fun! Reg |
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Tektronix 2465B Test 05 Fail 40 repair.
This seems to be a common problem so I thought I would report on my repair.
Summary: Apparently fixed by replacing the U500 hybrid with a known good one. Details: This is my main scope. In 2015 it received new caps, repaired SMD A5, and new cal. memory. It worked flawless up until a few months ago. At that point it started failing the power on self test with ¡°Test 05 Fail 40¡± messages. I set the scope aside dreading trying to find what I assumed would be another damaged trace on A5. After a while, I pulled it off the shelf and started testing it. Of course, it passed all self-tests. So I put it back in service and waited for it to fail again. Eventually, it did. This time I carefully measured the power supplies and checked that the DAC was basically functioning. Everything was okay. Before trying to troubleshoot the A5 sample-and-hold circuits I thought I would try an easy experiment. I swapped the U500 hybrid between a 2430A and this scope. Surprisingly, both scopes now work and pass self tests. I don¡¯t have a good explanation as to why this worked (or indeed if it has ¡ª only time will tell). Perhaps the hybrid is marginal and the 2430A uses it under slightly different conditions. Perhaps an issue with contacts ¡ª although I had already tried cleaning the contacts and reseating it. |
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Re: 11801 diagnostic help
Tek 11801 Timebase Errors
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Tektronix 11801, 11802, and CSA803 sampling scopes eventually fail with an E5622 timebase error. If you remove the bottom panel, you'll see a cluster of sram chips... Two of them are plugged into Dallas "smart socket" battery backup things, which in turn are plugged into the board. Likely the tiny batteries have died. You can replace the Dallas things, which is the Dallas/Maxim (discontinued!) part number DS1213. Or you can chuck the rams and the Dallas widgets and plug in two ST Micro part number M48Z35-70PC1, which is a battery-backed SRAM module. Digikey has them. After you do this, you'll need to power cycle two or three times until it works. There are coin-cell batteries on other boards in the main cardcage, but they seem to last a long time. Any other tips on 11801 or sampling head repair would be appreciated. Tek never published schematics or other service info beyond board swapping. The eeprom chips in the sampling heads seem to fail fairly often, and it would be interesting to find a way to replace them. John Larkin Highland Technology Inc jjlarkin@... On 3/15/2019 5:51 PM, Reginald Beardsley via Groups.Io wrote:
I'm not sure I can identify the board. There are a couple of boards with no markings. I reseated the 4 boards on the left side while checking to see what they are. the left two are a memory board and a memory expansion board. The 3rd board is marked "property of and copyright Silicon Software". It and the other board next to it look very different and have no Tek markings. |
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Re: 11801 diagnostic help
I'm not sure I can identify the board. There are a couple of boards with no markings. I reseated the 4 boards on the left side while checking to see what they are. the left two are a memory board and a memory expansion board. The 3rd board is marked "property of and copyright Silicon Software". It and the other board next to it look very different and have no Tek markings.
I have gotten it to run the self test and it stops in the extended diagnostics with the E5622 error. I'm still hunting for a service manual. The BAMA has an 11801C manual listed as an 11801. There are a couple on eBay and I've asked the sellers to verify that they are for the 11801 and not a later variant. So far not replies. |
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Re: 11801 diagnostic help
What is the voltage on pin 28 of the two socketed rams on the timing and control board in the bottom of the unit?
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On 3/15/2019 4:07 PM, Reginald Beardsley via Groups.Io wrote:
My 11801 arrived today. On power up it makes two beeps and puts up two lines of text on the screen: |
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11801 diagnostic help
My 11801 arrived today. On power up it makes two beeps and puts up two lines of text on the screen:
Diagnostics in progress Comm Test in progress But does not go past that. The seller sent a picture showing an E5622 error, "passed" below that and ???? for the timebase, main acq, mcu a-d acq entries and a picture of the screen with "Self test in progress". I have reseated all the boards and cables behind the CRT and the cables on the display board. The display board was missing the 4 corner screws. I have replaced those. So does anyone recognize the issue? While I was pulling the boards I checked the 4 lithium cells and all were over 3 V despite 1988 date codes. That did not match the service manual for the 11801C which is a little disturbing. Is this really just a CSA803 with 4 extra ADC channels? Does anyone know of a manual for this unit? I think all the ROMs are marked 1989, but was not meticulous about that detail as I expected reseating the connectors to have an effect. Thanks, Reg |
Michael A. Terrell
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