Gould Ultima / Nicolet Accura DSO software needed. - Page 1
Forum section: electronics / testgear

author: shakalnokturn
author_rank: Super Contributor
timestamp: October 04, 2019, 10:34:13 pm
content: I'll need to get really lucky on this one...I have a Pentium PC based oscilloscope, Gould Ultima 500, 4 channel 500MHz, 500M to 2GS/s, circa 2000.The only thing... is it is currently a big doorstop, the HDD has failed.As far as I know it should run MS Windows 200 pro, I may be able to get my hands on that but all the specific software is a bigger problem.The ideal would be a drive image from a working Ultima 500, however I'll take any information, links, partition structure or individual software files from the Ultima 500, Accura 100, Accura 50 oscilloscopes.My doorstop thanks you!

author: shakalnokturn
author_rank: Super Contributor
timestamp: May 30, 2020, 10:44:20 am
content: Bumping this back up, I'm still looking for the software or a disk image...

author: PushUp
author_rank: Regular Contributor
timestamp: May 30, 2020, 06:38:40 pm
content: I had a HDD failure in the past with +25 of virtual images, which I didn't want to redo once again. Therefore I looked for an identical model on ebay. I was lucky to find three of them in used conditions, of which one was out of the same production month. Therefore I only needed to swap the circuit board on the backside and anything was fine, being able to secure the files on different HDDs in the end, because the read head was fine...You have to be more precise as far as the HDD failure is concerned. Is it dead, does it make noise, which connectors, which model, have you already searched for a used one. Are you able to connect it to an external power supply, in order to clone it with your pc and rescue the content with different types of software such as "MiniToolPartitionWizard" or "EaseUSDataRecoveryWizard" or "CyrstalDiskInfo" to get more information of the HDD itself?If you find another used HDD of the exact type, but you are not able to swap the inside yourself, you will find a repair-shop, which is porbably easier, than searching for an old image as nobody has answered for such a long time...Here is an example - just a video - no recommendation:Toi, toi, toi!

author: shakalnokturn
author_rank: Super Contributor
timestamp: May 30, 2020, 11:21:41 pm
content: In this case the HDD (6GB-ish Seagate) has the surface physically damaged, the previous owner even removed the sealing tape for some reason (stuck heads at one point maybe...).After attaching it to a Linux box and running hours of dd all I've been able to recover is the partition structure and fragments of data too small to be of any use. I'm screwed!

author: shakalnokturn
author_rank: Super Contributor
timestamp: December 01, 2020, 10:50:03 am
content: Bumped again.A year later I still haven't found anything.

author: le_stauss
author_rank: Newbie
timestamp: February 26, 2021, 02:47:12 pm
content: hey,I can do !I have 3 of accura 100bye

author: shakalnokturn
author_rank: Super Contributor
timestamp: February 26, 2021, 03:51:14 pm
content: Hello le_stauss,Actually I have no idea if the software is identical on the Nicolet Accura and Gould Ultima scopes, anyway I haven't had any other offers so far so it's worth a try.I'd be greatful if you could get an image to me some way or another. Is the HDD 6.4GB on the Accura 100?

author: le_stauss
author_rank: Newbie
timestamp: February 26, 2021, 06:32:30 pm
content: hi,mine are about 20 or 30gig large.Could you put pictures of acquisition board and others where you have the memory (scope board place).I have already a backup of these scopes, it's near 3 or 4 gig compacted.See u soon

author: shakalnokturn
author_rank: Super Contributor
timestamp: February 28, 2021, 05:40:49 pm
content: Here are the front-end and acquisition PCB photos.Do you think it's worth trying with the Accura disk image?

author: Kowilli
author_rank: Newbie
timestamp: March 20, 2021, 11:28:38 pm
content: Hello, I got the same oscilloscope cheaply but without any description. The device boots and appears to be working, I'm trying to create an image of the hard drive. I'll get in touch if it worked.

author: Kowilli
author_rank: Newbie
timestamp: March 28, 2021, 08:46:08 am
content: I have created image from the hard drive with "Drive Snapeshot".link to Google drive:https://drive.google.com/drive/folders/144wFaoal75S2RpnGDz6rabrkihhACc4D?usp=sharingi will share the files during the day.Procedure:- Connect IDE harddisk >20GB to IDE port of any PC- Start Snapshot -> "Restore Disk from File- Follow instructions (source, destination, ect.)

author: Kowilli
author_rank: Newbie
timestamp: March 28, 2021, 01:53:32 pm
content: Here are a few more pictures and tips:

author: Kowilli
author_rank: Newbie
timestamp: March 28, 2021, 01:59:46 pm
content: I have the possibility to get a user manual, if interested you can contribute to the costs. The provider requires 75Eur. It's a little too expensive for me. The operation of the device is not easy although I am an electrical engineer and have experience.

author: shakalnokturn
author_rank: Super Contributor
timestamp: March 28, 2021, 05:48:46 pm
content: Thanks Kowilli for going to the trouble of imaging the HDD, I don't know yet whether I'll be able to make use of it of if I'll need the user manual but if your image allows me to get the DSO running again I'll be pleased to help you in buying the documentation.

author: shakalnokturn
author_rank: Super Contributor
timestamp: March 31, 2021, 12:30:18 am
content: Thanks to Kowilli I have a HDD image to work from.When I bought this scope I was told that the internal LCD had stopped working and that it had been used with an external monitor until the HDD failed.Points noticed recently:One cracked hybrid resistor network on CH2, I assume it's for attenuation.PCI interface board to acquisition system also containing internal LCD graphics and an additional VGA output (+GPIB?) has had the FPGA's and ASIC's reworked.Power connector to acquisition board had previously heated at the white wires, burnt contacts had been corrected by soldering straight to the power header.Bad contacts related to the ATI Mach64 VT4 regular VGA output. (Not sure how the 2 VGA outputs are handled, I assume one can mirror the scope screen while the other can be used for the PC.After copying the HDD image to a spare 40GB drive I'm greeted with a German Win 2k boot screen followed by a blue screen failure that seems to indicate that the OS is missing the IDE drivers.Going by the photos Kowilli posted we have different mainboard models mine is a Tyan S1854.Next step is getting hold Win 2k pro setup files to see if I can get away with just a system refresh and change of language. (My German is poor...)

author: shakalnokturn
author_rank: Super Contributor
timestamp: April 02, 2021, 01:38:48 pm
content: After loosing many hours on not understanding the requirements to install Win2k (which are basically having a CDROM drive or a BIOS that supports booting from USB) I have a running OS with a Franco-German flavour to it. No additional drivers were needed after all for the Win2k install.The ATI graphics shows some artefacts seeming to confirm that it is defective as previously mentioned. I have old cards around when I get round to that.Next big problem is that when running the Ultima.exe DSO sotware it reports "PCI card not found".I'm guessing that his refers to the heavily reworked card pictured in the previous post.There are no unknown devices showing in the hardware list.I'd expect it to be plug and play but maybe it needs an IRQ allocated in BIOS.I'll check the voltages on the LDO regulators on the DSO interface card but by now chances of repair are starting to look low.

author: shakalnokturn
author_rank: Super Contributor
timestamp: April 03, 2021, 11:25:42 pm
content: I feel as if I'm making some progress in the fault finding although once more I wont get any further without help.I shuffled the PCI cards around a little just in case it was bad contacts: No better.Then went to test the onboard voltages from the LDO regulators, all were good.Because they were socketed and it's in my habit to collect data I went and dumped the socketed IC's on that board.There's a 24LC08 for the AD9884A configuration which I still suppose is there for an independent from Windows oscilloscope display.A PIC16C558 which is likely there for power sequencing and other housekeeping stuff.A 93C46 for the PCI9050 low-cost PCI bus interface identification and configuration.The daughter board not showing up in Windows or being found by the specific software, the PCI9050 was a decent suspect.Browsing through the datasheet confirmed that the board identification should be in the 93C46, comparing the example table in the datasheet and my dump confirmed something was wrong...The 93C46 makes no sense, I wanted to write the identification data given in the datasheet to see if it would show in Windows that way and found out after a few erase re-write attempts that my 93C46 was defective.No 93C46, no identification on the bus no setup for mapping PCI to local address space!So now I'd need the contents of U41 to get any further.https://datasheetspdf.com/pdf-file/540195/PLXTechnology/PCI9050/1

author: shakalnokturn
author_rank: Super Contributor
timestamp: April 11, 2021, 06:21:28 pm
content: Another small update.Once more thanks to Kowilli's good will I have a dump of the 93C46.Because I had no DIP8 around I programmed a SOP8 version and soldered that to the back of the PCB to try.Still "PCI card not found"...I went and probed the 93C46 during several PC startups, hardware detections and launching the Ultima.exe software. Absolutely no bus activity.The PCI9050 is quite warm to the touch, the hottest IC on the card in fact.I checked the PCI clock input and reset, nothing stuck there.I'll try ordering a new PCI9050 they can be found for 6€ approx. If no better I'll be tempted to give up, this scope is looking like a compilation of defective parts.

author: Kowilli
author_rank: Newbie
timestamp: April 14, 2021, 08:54:05 pm
content: There is a way to check the PCI controller.- Download the software fromhttps://www.broadcom.com/products/pcie-switches-bridges/software-dev-kits.- Install it on any computer with PCI slot.- Remove the acquisition card from the Ultima and insert it into the computer, of course not into the switched on PC.- Start the software. The software operation is quite intuitive. The PCI controllers from PLX, then AVAGO and now Boerdcom are automatically recognized. With this software I also read the EEPROM.Here is the description of the software.

author: shakalnokturn
author_rank: Super Contributor
timestamp: April 15, 2021, 04:32:13 pm
content: Thanks once more for your input Kowilli, you've been really helpful on this. (Did you get notification of my help towards your user manual?)I've ordered a spare PCI9050 the scope is reassembled and back in the pile of "to do" until I receive the spare.I'll reopen the case then and try the diagnostics software before replacing the PCI9050.(Note to myself) should also try to remember to take a couple of thermal shots for reference.

author: shakalnokturn
author_rank: Super Contributor
timestamp: May 25, 2021, 12:40:17 pm
content: Some news on this epic mess...I've been running round in circles a little but have made some small progress:Received the PLX9050 from China, it took me some time to unwrap it when I eventually did it was clearly a pulled and cleaned part not a NOS one, some of the corner pins had lost about 1/3 of their width.Ebay seller is "yyen4650" just in case you want to avoid him too.Anyway not having anything better I took a couple of thermal images of the original running then replaced the PCI9050 (it's only TQFP-160). Results were exactly the same PCI card not found, PCI9050 temperature exact same.No luck with the PLX monitor software either.Not knowing if my replacement PCI9050 was actually any good I started looking for another source, while looking around I discovered that some dual RS-232 boards used the PCI9052, downloaded the datasheet to check compatibility. As far as I can tell they should be interchangeable, just the 9050 is long obsolete while the 9052 isn't.Scrolling through the PCI9052 datasheet I came across this: "Notes: 2k-bit devices such as the FM93CS56, are not compatible.The PCI9052 does not support serial EEPROMs that do not support sequential reads (such as the FM93C46L)."Oh, crap! That's precisely what I used a 93C46L... Bad!!!One EEPROM replacement and programming later, the board was detected by windows and the Ultima.exe software able to run, which initialises the scope's front panel and brings up a window with the DSO traces and menus. Scope seems to be mainly working although it looks like a recalibration will be needed, I'll have to look into the cracked resistor network on CH2 too later.Next problem is getting the integrated LCD display running again. I was hoping for a dead backlight inverter but there's no display at all neither on the LCD or on the slow acquisition PCI card's VGA output.The integrated LCD is connected to 30 conductor FFC socket named SK2, the backlight is separate.LCD is a 10", NEC_NL8060AC26-11, 3x6 bit parallel bus model. The video path seems to be analog to digital through an AD9884A, then through U19 (EPM7128SLC84) before the LCD.The analog video goes through groups of AD8055 voltage feedback amplifiers, one group before the rear VGA output the other before the AD9884A.The problem is I can't seem to find the origin of the analog video anywhere on the board, AD8055 inputs all lead to SK1 - 15 conductor FFC connector on the rear of the board so i'm assuming the VGA source is elsewhere...The illustrations of the back of the scope on the user manual don't show any other VGA output than the one on the slow acquisition board, I have a separate VGA PCI board but that was likely dropped in by the previous owner.There's a "Microsoft SMS Mirror Driver" in the display adapters, I'm not sure how that works having never met it before.If another owner could confirm this it would be quite helpful. Then I'd have to try and discover the FFC pinout.

author: shakalnokturn
author_rank: Super Contributor
timestamp: May 25, 2021, 12:50:02 pm
content: Looking back at Kowilli's pictures I see there's a FPC from the his AGP graphics card VGA output so I suppose that answers one question - not the pinout unfortunately.

author: shakalnokturn
author_rank: Super Contributor
timestamp: May 26, 2021, 10:01:58 am
content: The pinout for SK1 should be along these lines, a small doubt on the Sync lines, confident enough for the others.FFC pin 1 is furthest from the rear mounting bracket.1- GND2- Red IN3- GND4- Green IN5- GND6- Blue IN7- GND8- GND9- GND10- DDC-SCL11- Vsync? (100k Pull-up, U19-54)12- GND13- Hsync? (100k Pull-down, 68R->U19-14)14- DDC-SDA15- GND

author: shakalnokturn
author_rank: Super Contributor
timestamp: June 02, 2021, 10:21:36 am
content: SK1 pinout confirmed.I tried with a couple of AGP graphics cards, the first was a Radeon 9200SE with a convenient 15 pin header for the VGA output and DVI as a second output. That was good enough to get the internal LCD working.There were a couple of issues: I liked the idea of having the M$ Windows desktop available on an external LCD while the internal scope screen was still active. This worked, but annoyingly on a cold start the primary display is DVI so the Ultima software won't automatically come up on the internal screen. There were also some hard to describe display glitches made worse by mouse movement bad enough to want to try another graphics card for comparison.Second graphics card was an older still SIS6328, on the whole it works better than with the ATI one, there are still a few glitches in the display but not enough to be a real bother.The PCI slow acquisition / VGA to digital LCD adapter board is a strange setup... During the Win 2k start-up screen the 640x480 is scaled to fit the 800 horizontally on the internal LCD while the 480 isn't stretched to fit 600 pixels, it's displayed with a large black bar at the bottom.While I had the front panel removed to reattach the HDD (LCD must be removed to access HDD...) I dumped the configuration EPC1441 EEPROM for the front panel FPGA.Next problem:I've removed the frontend PCB to look at the broken resistor network on CH2, once again it looks as if I've been sold the worse of 2 or 3 scopes, the lower shielding for CH4 had previously been removed and refitted without solder. (I hope there isn't another surprise problem hiding somewhere in the coupling relays on CH4...)The resistor network seems to be a 8 resistor ladder of which I was able to measure 5 on the cracked network, 3 values are unknown because the resistors themselves are cracked.I also measured some values between pins on a good network removed from another channel. (Attached schematic and values/measurements.)Is there an easy way to calculate the 3 unknown resistors (Ra, Rb, Rc) from what I have? I'm sure it's possible but my maths are a little rusty...

author: shakalnokturn
author_rank: Super Contributor
timestamp: June 04, 2021, 10:16:47 pm
content: Removing pins 2, 3, 5 on the resistor network breaks all parallel connections, I was able to measure all resistors separately which worked out quicker than solving the equations for me.Previous network sketch is wrong for one value due to a link assumed cut on the split component that wasn't.Confirmed good enough values attached. It turns out as an almost R-2R ladder.

author: Parus
author_rank: Newbie
timestamp: June 19, 2021, 11:37:22 am
content: Any luck yet?Recently I have saved one of these with the repair of itś PSU. On the disk I found the original (UK) installation files and utilities. These will install a kernel plug-in in the OS for communication with the custom PCI card and the scope program. I have upgraded the Tyan board with a new PIII/1Ghz processor and more memory. With XP pro installed no problems, after that with W7 no luck.A manual and maybe some of the special intelli-probes would be very niceOscar

author: shakalnokturn
author_rank: Super Contributor
timestamp: June 19, 2021, 09:54:09 pm
content: Getting there slowly, it's mostly a working scope now.I previously mentioned the CH4 front-end shielding having been removed... It does appear there's some kind of grounding problem on CH4, applying pressure on the front BNC's can add quite a bit if noise to that channel and others to a lesser extent.Also a problem on 8 bit real time sampling at 2GS/s (4CH interleave) with maximum (1Mpt) sampling memory it just won't display the waveform. I'm not sure if this is a hardware fault or software problem.Can other users confirm how their Ultima 500 reacts to this setting?It would be great if you could get an archive of the original install files online somehow for people with dead hard disks. KO4BB's website is one of the most reliable places to go for TE documentation and has an upload option.I'll try and upload the user manual there soon.As for the dedicated probes I've never ever seen any around but must admit to never having searched.

author: Parus
author_rank: Newbie
timestamp: June 20, 2021, 08:30:22 pm
content: Sounds like the huge thermal cycles have done their job, That board really gets hot with 160W on itś legs. Specially on the right hand side (channel 4) with the airflow on the bottom going from left to right. Inspection and reflow of that complete area, but most likely you have done that already.I will create some zip archives of the different versions of installers, automated measurement scripting and reporting software Proview and put it on KO4BB if i can find it all together. The old HD is quite a mess with several Gb'ś of rubbish and many backups of the same.For your question about the upper limit behaviour i have no answer yet. After many experiments i am now putting it all back together and a sticky message came up about missing/corrupt skew and ets calibration data. A auto calibration does not solve this, "see manual for special calibration instructions" but i don't have ...... (little hint: my email is public). Inserting a old calibration file from one of the many backups might solve the message but this is not the way to go.Still some work to do.

author: shakalnokturn
author_rank: Super Contributor
timestamp: June 22, 2021, 07:14:02 pm
content: Yes I noticed that (front) end got quite a bit hotter than the CH1 side.I'll do a close inspection of the solders or bulk reflow I only hope it isn't the preamp ASIC that's whacked.I'm not sure this could affect your ETS/skew error, mentioning it just in case:After patching up my cracked resistor network (CH2) I was experiencing some intermittent offset problems on CH3, poking around at the acquisition board while running lead me to the resistor network on that channel. Problem was solved by reflowing the solders where the pins connect to the ceramic.It's worth checking the power connector to the acquisition board and power header solders on acquisition board they run warm.A couple of other disturbing findings about this scope: A lot of interconnect is through longish FFC's.Hooking a probe to the probe compensation output without attaching the ground clip you can expect some DC offset, the current draw from the front panel makes the probe comp. output above ground...Similarly there are PS test points at the rear middle of the frontend board. On my scope the +/-5V supplies only read around +/-4.85V most of the loss is in the FFC's between the acquisition and frontend board.

author: Parus
author_rank: Newbie
timestamp: June 24, 2021, 11:34:00 am
content: I have uploaded a zip to KO4BB with the utilities, a OS system driver for the Jungo PCI of the Tyan PC board, 3 full setup versions (V3.05/7/8) and a GUI only V3.10 that runs fine on the 3.08 drivers. Many thanks to Shakalnokturn (and Kowilli) for the 3.10 GUI and a preview of the manual. Shakalnokturn has also uploaded the manual to KO4BB, so soon the full package is available to download for those in need with a crashed or missing HD.Yeh i have noticed some weird and shortcut engineering in it's design. Looks like it was a quick and dirty HP Infinium clone job with the same look and feel to get a piece of that market share for way less $ (but still 15K $). Don't let these things fool you, it may just be so by design. It got me with the repair of it's PSU, chasing rabbits based on some weird measurements. Just wondering how many of these where sold, and how many are still alive today.My skew/ets problem is not an error, its just wants a calibration of that (with a very sticky boxed message) but this is not a part of the standard auto calibration and there is nothing in the manual about it. I have been swtching around al ot between different OS's and setup versions and one time it did a not-so-standard calibration, but how i got it there i can't remember anymore. I was busy getting the system to work stable,, and calibration was step 2. It's a bit time consuming.btw. 4-ch interleaved, full BW, 8 bit is one of the auto calibration tests

author: shakalnokturn
author_rank: Super Contributor
timestamp: June 24, 2021, 03:35:56 pm
content: Thanks for the uploads...Now because of that, once I get CH4 sorted, I feel I ought to install a windows XP on a much faster mainboard / CPU. No doubt that will get me into a whole lot of extra trouble.What was wrong with your PSU?Quote from: Parus on June 24, 2021, 11:34:00 amYes I noticed that as I've been through a few auto-calibrations myself.Funnily it does not throw an error when calibrating that mode, maybe I'm foolish in assuming it should if something is wrong.Searching around the system files I noticed there were several versions of the Jungo drivers:GNT_PCI_4700_9050_V503.infGNT_PCI_2730_V505.infGNT_PCI_4700_V522.infGNT_PCI_4701_V522.infGNT_SYNCHRO3_V522.infI was expecting my scope to use the GNT_PCI_4700_9050_V503 driver as the slow acquisition board is PLX9050 based but it doesn't. Maybe I ought to experiment forcing other drivers to see how it behaves on 4 channel interleave.Does your cal error actually show anything obviously wrong when looking at a waveform in ETS such as a very jagged / jumpy waveform with sample points out of sequence?I'm not sure where the calibration is stored and if all in a single place, I've attached whatever seemed calibration related on my scope (CalibrationData.dat / CalTestResults.txt / VGen.log) maybe replacing CalibrationData.dat and running an auto cal over that will be enough to satisfy yours...

author: Parus
author_rank: Newbie
timestamp: June 26, 2021, 02:03:25 pm
content: If it ain't broken, don't fix it. Specialy a mainboard upgrade is a bit useless and might fail. It's very timing sensitive, changing the more advanced settings in the bios other than default often makes the system hang. My NT4 system had errors that I could not repair with the standard install cd because it was a high security version (that made me smile), no USB support, obsolete network and a terrible user interface. I have upgraded CPU, memory (windows really likes that), networkcard and a extra USB card to create a bit of extra head room for a "newer" OS. With XP running it's just a bit more user friendly but not a better scope. If you are happy with your W2K install, just leave it.Because this is a little bit difficult to accept for us explorers you can also add a second scratch HD and start experimenting.For the search enigine archives:The PSU in the Ultima is a third party Ferrus FP250-710. Itś a low frequency (36kHz) push-pull smps with 3 separate switching circuits on a common PWM, 7 output rails at 700W max total.A real pain in the nose to work on, no schematics, no info, compact, components hard to reach, testleads don't fit or hitting other components and because of the layout of the 3 circuits on the baseboard no clear separation between prim. and sec. So most of it is hot and can bite humans and equipment pretty bad what made live testing a bit tricky.My PSU was very dead, no output, not looping in startup and no visible damage. First thing: check primary, all ok DC present. Next: gate signal at the regulated startup rail, present but low and not a happy PWM, at least not enough to pull the FET open. That signal comes from a driver transformer which is just a small ring core with 3 solid wire windings, not a real failure suspect. So I started chasing a short of some kind that pulled the PWM down in the other circuits.Driver circuit second switcher, OK. Third switcher OK, feedback OK. PWM circuit: SG3525 fully functional but output weak. This is a common old age thing where the open collector output drivers are getting leaky, higher voltage drop, lower output voltage and some extra heat that accelerates this proces. Chip will fail in the near future, specialy if it drives the transformer directly.. Simple fix, just replace. Now with the PWM on level again i'ḿ back to starting point, but this time on the primary side of the driver transformer. Desoldering it's leads, check: open .... shoot.Easy fix: made with a piece of wire a new primary winding on top of the other, and with this it came back to live.Next big question is how is this possible? The 100mA running can't even scratch that wire so it must be a combination of thermal and the ultra-sonic coil beating.PSU fact: it has a small 12V standby DC/DC supply that is powered from the main bulk capacitor. Without powerswitch the complete primary is always on including the divider/bleeder resistors. That explains the 15W standby power usage.For the calibration i will try a "smart" approach with compairing the files of the old with the new (and yours).A bit long weekend story, salut

author: Parus
author_rank: Newbie
timestamp: July 03, 2021, 12:24:03 pm
content: After reading the service manual of a Gould 400 DSO i tried the same approach on the Ultima 500 and found the "hidden" section of setup and calibration.In the GUI go to utils menu with a.o. auto calibration, push the last button of the vertikal screen colunm 4 times and an extra option "engineering" will appear. In this section all the low-level magic can be monitored and calibrated.I have cleared my sticky Skew/ETS warning, but meanwhile CH2 got very noisy and the trace is jumping around, grrrr

author: shakalnokturn
author_rank: Super Contributor
timestamp: July 03, 2021, 10:44:08 pm
content: RaymondMack: Thanks for the photos and too bad for the HDD ..It looks as if the hardware doesn't share much in common with the Ultima 500 after all, the acquisition and front-end PCB's are very different. The common parts seem to be the PCI slow acquisition, front panel, LCD, CCFL inverter. (Maybe PSU?)Parus: Nice find that secret service menu, I wouldn't have thought of it...Maybe worth reflowing the resistor network on CH2 as mentioned in a previous post.If you have removed the coax interconnect make sure the connecors have been mated correctly. If you don't align them perfectly the inner pin can easily plug just next to the two curved spring contacts, giving a poor contact and the symptoms you have.If this has happened the spring contacts will need realigning slightly. Don't ask me how I know...

author: shakalnokturn
author_rank: Super Contributor
timestamp: July 07, 2021, 11:49:23 pm
content: Went back inside and see if the CH4 intermittent noise could be solved. Took a few more shots.In the end the most likely was that there were also weak solders on the other half of the shielding (the one that wasn't almost floating around) and that was causing the problem.Took a few pictures and found a couple more details in there that didn't impress me: Lowish clearance between the aluminium plate that holds the BNC's and tracks on each input, what looks like solder paste residue, some found on the tops of a couple of SOT-23 packages, worse on the front sides of two of the FE ASICs, over several leads.Also a tendency the shielding has to rip one of the tracks to a nearby capacitor... (Pictured on CH2.)

author: Parus
author_rank: Newbie
timestamp: July 13, 2021, 11:21:47 am
content: Hi, thanks for sharing these nice detailed pic's, can be usefull. I hope this will clear your noisy problem.My patient is on a waiting list for it's inspection and reflow operation of ch2. A selftest also reveilled an attenuator problem on ch4. On the lowest range (zero path) everyting is fine, but on the middle or high range the attenuator kick's in with a relais click and the signal (and trace) are gone. So it will not only be a reflow session but also a probing one.Not a happy scope yet

author: Copeland
author_rank: Newbie
timestamp: June 30, 2024, 12:04:19 pm
content: Did you already found the software rfor this scope? I happen to have a Gould Ultima 500 and can make a copy of the drive inside the scope.Do you have a service manual of some sorts?

author: shakalnokturn
author_rank: Super Contributor
timestamp: June 30, 2024, 01:00:28 pm
content: Did you read the fyll thread? Parus uploaded the software to KO4BB's excellent archive. Feel free to donate if his website helps you, he makes it available from personal funds, donations help it stay alive.

author: Copeland
author_rank: Newbie
timestamp: July 23, 2024, 09:07:56 pm
content: Hi,I did not: I only saw the first page (somehow my browser showed me the web page in a rudimentary fashion: after using a different browser I was able to see the whole page.I'll make sure to visit the KO4BB's web page!Best Regards,Robert