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Archiving ROM images
I hope no one objects to the cross posting, but I have instruments from all three OEMs.
I'm getting ready to try to bring up my Tek 11801 when the replacement NVRAM shows up. In the process I'd like to archive all the ROM images. EPROM seems pretty straight forward. I'm not sure about NVRAM devices with factory cal data. Ultimately I plan to do this for all my T&M gear for which images are not already available. Subject to not wanting to disassemble stuff just to copy ROMS. Can anyone point to existing descriptions of the details? If not, is anyone with experience doing this willing to write something that will guide a novice through the process? Are any of the OEMs opposed to people trying to maintain old gear posting ROM images online? Reg |
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Re: 2247A PSU Troubleshooting
Well I¡¯m not sure which ones would be appropriate. There are a bunch, for
sure. Blue, silver, bigger, etc. I don¡¯t presume to know why those different ones were selected for each location. I haven¡¯t ordered yet, had a busy day, but planned to order extra anyway. Will have them here if we can determine which ones should go. All the ones on that list discussed earlier, I guess. Nick On Sat, Mar 23, 2019 at 3:32 PM nielsentelecom@... < nielsentelecom@...> wrote: Nick, |
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Re: 11801 extender card
These are not card edge connectors. They are 3 row pin connectors of around 90-120 pins and are used in the main card cage of the 11801 behind the CRT.
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-------------------------------------------- On Sat, 3/23/19, nonIonizing EMF <nonionizingemf@...> wrote:
Subject: Re: [TekScopes] 11801 extender card To: [email protected] Date: Saturday, March 23, 2019, 2:40 PM On Sat, Mar 23, 2019 at 06:58 AM, Reginald Beardsley wrote: > > Does anyone know of a Tek part number or a source for a card? > I recently wrote a Wikipedia wiki regarding the Tektronix extenders as part of a JAMMA Connector wiki that was submitted and recommended to be merged with the JAMMA wiki.? I updated the JAMMA wiki with all the references of that style edge connector I could find pretty much in the Other Origins section. If I missed anything... please reply and I'll update accordingly.? I added some other edge connector type cables to while at it that I've seen related to Tektronix equipment also.? I'm thinking I can write a separate wiki to one of these days or at least create a re-direct to. Thanks |
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Re: 11801 extender card
On Sat, Mar 23, 2019 at 06:58 AM, Reginald Beardsley wrote:
I recently wrote a Wikipedia wiki regarding the Tektronix extenders as part of a JAMMA Connector wiki that was submitted and recommended to be merged with the JAMMA wiki. I updated the JAMMA wiki with all the references of that style edge connector I could find pretty much in the Other Origins section. If I missed anything... please reply and I'll update accordingly. I added some other edge connector type cables to while at it that I've seen related to Tektronix equipment also. I'm thinking I can write a separate wiki to one of these days or at least create a re-direct to. Thanks |
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Re: 2247A PSU Troubleshooting
Nick,
I replaced more than that on my 2246A supply. For the pain to remove the power supply, I thought it would be worth it. I may had others that were leaky, I don't recall. I still have the old ones stashed away somewhere, I looked to see what I replaced, but I didn't find them. I thought it may be helpful to you. NielsenTelecom |
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Re: 2230 display distortion in the first quadrant
You have a damaged CRT.? Most likely from being dropped.
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Regards On 3/22/2019 10:46 AM, peterp@... wrote:
Hello all, I just got a 2230 scope from the (in)famous website to help me with some vacuum |
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Re: Tek 547, 545a, and R561B for sale near me
01950
On Sat, Mar 23, 2019 at 2:03 PM Daniel Koller via Groups.Io <kaboomdk= [email protected]> wrote: Where are you? (zip code?) |
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Re: Tek 547, 545a, and R561B for sale near me
Where are you? (zip code?)
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? Dan On Saturday, March 23, 2019 1:59 PM, David Berlind <david@...> wrote:
Hey all.. spotted these 3 beauts for sale near me. Don't know the seller. But it's very close to me. Asking price for all 3 is $125. There's an extra 3A74 plug in that goes with the bunch. I have facilitated purchases and shipping for people in this group before (as some will attest to). However, I've yet to ship a Cadillac. |
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Tek 547, 545a, and R561B for sale near me
Hey all.. spotted these 3 beauts for sale near me. Don't know the seller. But it's very close to me. Asking price for all 3 is $125. There's an extra 3A74 plug in that goes with the bunch. I have facilitated purchases and shipping for people in this group before (as some will attest to). However, I've yet to ship a Cadillac.
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Re: 2230 display distortion in the first quadrant
Hello Peter,
it looks like a magentization of the right upper corner of the magnetic shield. You should de-gauss it. Best regards Joerg peterp@... schrieb: Hello all, I just got a 2230 scope from the (in)famous website to help me with some vacuum --- Diese E-Mail wurde von Avast Antivirus-Software auf Viren gepr¨¹ft. |
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Re: 2247A PSU Troubleshooting
I removed 8 diodes marked ZS last night and will order replacements today.
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Will report back with results. Thanks again for all the help so far Nick On Fri, Mar 15, 2019 at 9:37 AM <tekscopegroup@...> wrote:
On Thu, Mar 14, 2019 at 03:57 PM, tom jobe wrote:There are about 17 one amp ultra fast diodes that are used to rectifyIf they are marked ZM or ZS they are well known to get leaky. Replace |
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11801 extender card
I want to investigate the possibility of replacing the 1.4 ps jitter clock with a modern device with sub ps jitter. As there is no component level documentation that I know of, doing this will require probing the running system.
Hence my search for an extender card. Does anyone know of a Tek part number or a source for a card? I'd design one, but I don't know how to use any of the PCB design tools and already have my hands full trying to master FPGA DSP design using Vivado and Quartus. Thanks, Reg |
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2230 display distortion in the first quadrant
Hello all, I just got a 2230 scope from the (in)famous website to help me with some vacuum
tube ham radio equipment and it came with a fault. Here are some pictures and a short movie that show the fault: Both channels display correctly when the signal is in the lower half-plane of the display. As the displayed signals are moved to the upper half plane their part that falls in the first quadrant (upper right hand fourth of the display) distorts practically identically when each channel's signal is in the same position vertically. I searched the group and found a thread about an issue that may be related to mine. Unfortunately, the details are greek to me :-) Here's the old posts: /g/TekScopes/topic/7647928#70205 /g/TekScopes/message/71388?p=,,,20,0,0,0::relevance,,2230+Displayed+signal,20,2,0,7648113 Also, if anyone has any leads to repair services in New Jersey please let me know. I also have a 2215A with ch2 inoperative and a 475 that's screwed up so there's plenty of business for such a service. Any help would be greatly appreciated, Peter |
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Re: Switch won't latch - 7CT1N
Rolynn
I'm sure you mean well, but there are no switches on any 7CT1N that are immediately behind the front panel. The shaft in question is six inches long, as I already stated. It is already obvious that the cleaning material should be introduced directly into the switch, not via gravity feed from the front panel, which is entirely infeasible. I have already done everything mentioned here with no improvement whatsoever. Evidently the issue is mechanical damage to the small rod's track. EJP |
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Re: 2213A Novice, unsolved anomaly encountered, documented & video
Hi Gary,
It might be helpful to drive an input from the 'probe adjust' output to be able to observe the state of the vertical when the horizontal collapses. Just a solid wire from probe adjust to the centre of the BNC will suffice. This would also expose the state of the trigger circuits as the collapse happens. Cheers, Brian. |
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Re: 91% Isopropyl Rubbing Alcohol to clean potentiometers?
This topic has a dangerous habit of feeding on itself with information that has only tangential relevance to the subject of TekScopes.
I understand that we have more than a few members with chemistry backgrounds who can expound on this topic ad-infinitum, In addition there are many members with their own stories or experiences. At this point there is very little of value that can be added to the pros and cons of using Isopropyl Alcohol on TekScopes. But each time someone tries it seems to annoy the vast majority of our members who, I can only conclude, seem to prefer their scopes dirty. In deference to the majority I am requesting that this topic be put to bed for once and for all. Thank you, Dennis Tillman W7PF -- Dennis Tillman W7PF TekScopes Moderator |
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Re: 2213A Novice, unsolved anomaly encountered, documented & video
tom jobe
I hope the 2213A owner follows JC's test plan, or some variation of it.
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The 2213A needs a good logical plan to find this most unusual failure. It's great to hear that David Hess has been helping him on this project over on the EEV Blog! There are plenty of 22xx parts available once this mystery is solved. tom jobe... On 3/22/2019 4:45 PM, chipbee40 via Groups.Io wrote:
Looking at your Youtube, something is obviously failing with heat so freeze spray would be helpful (upturned canned air is fine). My initial thought was U760 as the timebase is collapsing but I've not seen one fail such that the power led would flicker. Unplug the timebase, see if it still fails. (You are looking for the power LED to flicker, nice symptom, unusual!). Surprised the scope isn't tripping completely. I'd suggest monitoring the power rails to see if its just one rail failing or all rails. Complicated with switching supplies because all will drop on overload as the switcher detects a fault but not impossible to ascertain which rail is overloading. I would start by disconnecting the feed to the multiplier (so nothing on screen) and just observing the power led (or monitor the supplies) for any failings. You can also remove power to the attenuator board, an unlikely culprit but I have had the opamps go short. You could just pull all the power supply links and monitor the rails but without a load the fault might not show. What is the Y amp doing when it fails? Amplitude still good? Your replacement parts look ok. Hopefully you have checked the obvious, I've received these with loose screws jammed in unlikely places, solder bridges due to careless repairs. JC |
ROLYNN PRECHTL K7DFW
Brian Cockburn
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