The early   repair of Agilent 54810A - Page 1
Forum section: electronics / repair

author: GGMM
author_rank: Frequent Contributor
timestamp: June 22, 2024, 08:28:38 am
content: Hello,Well, now my Agilent 54810 is starting to work.Power pb is set (Short circuit capacitor reminder on -12v on main acquisition board)The keyboard works and I can enter the setupThe hard drive that seemed strange to me works (Loads a windows 95), I disconnected and put aside. Save to be do after.I still have a problem with the backlight.The SVGA board operates both an external monitor (ok) and an internal LCD monitor. (Nok)If I look at the control signals of the backlight board,it is in OFF mode(See picture)Normally the backlight should work as soon as the power is turned on.So something is blocking on the SVGA board. I wonder if there is not an info to check in the setup to activate the 2 modes?I checked the fuse specs on this board everything is good.The LCD screen must work immediately when power on (See example)I did the test by removing the cable that is common to both cards, it’s the same.And idea?cdtcdt

author: GGMM
author_rank: Frequent Contributor
timestamp: June 24, 2024, 08:25:57 am
content: Hello,After some investigations i found the documentation of the screento be seeI Have to verify my flat cable (cut?)All fuses( VGA card and screen) e are OKif anyone had this scenariocdt

author: GGMM
author_rank: Frequent Contributor
timestamp: June 29, 2024, 07:24:27 am
content: Hello,Can someone put his advanced setup settings of the Atlas 757 motherboard of an Agilent 54810A, I do not understand that my LCD screen does not work. As if disabled(?)Yet I apply to the letter the instructions of the manual service for the set-up.There is something that seems limited to the SVGA screen.Bizarre.Thanks

author: GGMM
author_rank: Frequent Contributor
timestamp: June 30, 2024, 02:22:32 pm
content: hello,I just did another test:Only on the motherboard CPU Atlas 757 and the video PCI card (66525).The additional video module card (66502) is present, but not inserted into a PCI slot, and is only used to interface the power button with the acquisition board to the power.The wire of the connector to the black light pin 5 is diconnect from the VGA card and grounded brings up the LCD screenAt this time the LCD screen worksSo the chips 65550 on the video card don't seem to send the signal to ground to active the back light.why???

author: coromonadalix
author_rank: Super Contributor
timestamp: June 30, 2024, 04:02:45 pm
content: normally this card is seen as an external video card, upon boot it is supposed to set itself correctly unless i forget somethingwhen windows boot it is supposed to see the video card lcd as the first display / peripheral, and thru windows you are able to select the second vga / display portand in windows you need its related driver to be installedhave you seen this documenthttps://www.keysight.com/us/en/assets/9018-40076/service-manuals/9018-40076.pdfyou are supposed to leave it inserted in the pci slot, while your translation is not perfectly goodtake a full photo of the card and it's hp number(s) on it, it is supposed to be this numberHP Agilent 54810-66502 or 54810-66503if it is the right one, does the battery is still good ?

author: GGMM
author_rank: Frequent Contributor
timestamp: June 30, 2024, 04:57:30 pm
content: Coromonadelix,I would like to make a few clarifications.The LCD screen seems to me it must be active from the start.If we look at this picture of ebay (and one I put before in the posts), we see that the bios is displayed well before the start of windows.Regarding, the other card that is supposed to be connected with the PCI VGA card, I think it only transcribes the formatted scan data with the program running windows to the PCI VGA card and displayed.I do not touch the battery (still good 3.2v), I think where are some data as calibration. (?)I specify that the set-up of the Atlas motherboard has no effect on this problem.I am thinking of doing the following tests:The same when changing PCI port for VGA cardTesting with other memory (you never know), I have stockAnd as a last resort, test with other more recent motherboard (I have stock), + the famous card VGA card + alim ATX, and connect the front to see that happen on the LCD screen.NB: I have contacted the society Humgar, they said that the LCD must work at power ONcdtExample picture Ebay:https://www.ebay.fr/itm/186482101844?itmmeta=01J1N036574SVAVF6J2GVGR7NW&hash=item2b6b330e54:g:v2oAAOSwDk5mYzHI&itmprp=enc%3AAQAJAAAA4LPe2AI%2BOlt916d8eXKGX9CuTHjcruBXW8%2FNWdfD8KBdPE1dku3fx8hIOATFonDaot9TTlYOyj5DblgjCcqnUzvIovgFAIHKYUtk5I11%2BRvFHN0RkQQGYa9WoSJulkqpAjkccGpvV%2FrknxbOY7sKOQKgZIUcAQW3yH7cDQJXsHj215RIIQyTnfLIebbws2S5ONvHh1c%2FvCRpklWrCyPB%2F9TMQJG9lpyY58hNIWS0ZKN9t%2FEsM%2F9DI7l2Z68%2F4Xgt%2FNNfOZsg6oujTZAB4%2BbZnxrt68ouAc%2FTzIWFRkH0mVxZ%7Ctkp%3ABk9SR9jijKCNZA

author: coromonadalix
author_rank: Super Contributor
timestamp: July 01, 2024, 12:25:22 am
content: normally the internal or external vga setting in bios where put later on following motherboard generations / chipsetsyou have choice like internal video card and external ..... something like pcieg pcig ... for sure the lcd must be active on boot to see the bios post .... and press DEL to enter biosok i found the vga section / card i dont see under this card, is the voltage on the yellow tantalum is there / ok ?the ebay link do show a keyboard error / keyboard not present is normally a bios setting, the computer will not boot further because the keyboard is missingIs the computer motherboard battery died ? it could explain some configuration errorsif you can enter in the bios try default settings if this option existthis is the chips 65550 datasheet check where the backlight control originatehttps://www.versalogic.com/wp-content/themes/vsl-new/assets/resources/support/pdf/65550.pdfyou have in it 7 instance of backlight informations, unless the chip registers have been changed or got corrupt ?? or the eeprom / bios on the card got corrupted ?

author: GGMM
author_rank: Frequent Contributor
timestamp: July 01, 2024, 08:40:52 am
content: Coromonadelix,I agree with you.As already said, I did a lot of tests with the BIOS (Total erasure, various tests of configurations..)A priori without result.The pictures are examples that prove you have the bios on the LCD screen at power onFor me:The VGA card is like "forced" to have a backlight blocked to NO.I think like you said a register of CHIPS 65550 may have been modified.The Windows 95 system is sensitive to card locations relative to the PCI port number.Let’s imagine, that this VGA card comes from another device and/ or moved slot.Maybe a start to the end of the application infinivision will "reactivate"?In any case I have a temporary solution by forcing the signal to 0v for the LCD screen to work.I will make a small connector to switch from card to ground easily.For the capacitor, I tested the multimeter, RAS, but I can remove it.Q3 which is an NPN has also been replaced.Now, I would like to save the disc, I will see if I can connect a burner DVD CD, for the power supply just solder a cable.I think I have exhausted the solutions, and I think the history of the registry seems to be the right direction. I hopecdt

author: GGMM
author_rank: Frequent Contributor
timestamp: July 01, 2024, 08:51:45 am
content: If you have time to read the datasheet of the Chips 65550, some informations page 269.It's become very technical... LOL.........Activity Timer Action0 When the activity timer count is reached, the ENABKL pin is activated (driven low to turn thebacklight off)1 When the activity timer count is reached, Panel Off mode is entered.5 Reserved (R/W)4-0 Activity Timer CountFor a 37.5KHz power sequencing clock, the counter resolution is 28.1 seconds. The minimumprogrammed value of 0 results in 28.1 seconds delay, and the maximum value of 1Eh results in a delay ofabout 15 minutes. A value of 1Fh results in no delay.This register controls the activity timer functions. The activity timer is an internal counter that starts froma value programmed into this register (see bits 0-4 below) and is reset back to that count by read or writeaccesses to graphics memory or standard VGA I/O. Reading or writing extended VGA registers does notreset the counter. If no accesses occur, the counter increments until the end of its programmed interval,then activates either the ENABKL pin or Panel Off mode (as selected by bit-6 below). The timer countdoes not need to be reloaded once programmed and the timer enabled. Any access to the chip with thetimer timed out (ENABKL active or Panel Off mode active) resets the timer and deactivates theENABKL (or Panel Off mode) pin. The activity timer uses the same clock as the power sequencinglogic. The delay intervals below assume a 37.5 KHz clock. If using a 32KHz input, scale the delayintervals accordingly.

author: coromonadalix
author_rank: Super Contributor
timestamp: July 02, 2024, 12:31:59 am
content: if you have 95 in this upgrade to 98se ... you had 95a 95b and supposedly an 95c called OSR 2.5they updated many things98se was better on most hardware ... my 2 centsthe video card bios is supposed to contain the lcd resolution / vertical / horizontal sizes and refresh rates ...some chips and technology "chipsets" had some software to help configure the vga card ... i'm not sure if this apply to this chips 65550 variantfound some drivers ---- attachedand yes as you wrote it could be as simple as the card position in the motherboard slots, just try this card alone remove the other(s) just to do the tests like a normal computer without the scope part(s)unless this card as problems ?? but you wrote it works if you play with the backlight on / off signal, personally to make the tests i would force the backlight on and try to install everything to see if the scope works as intended, or you have more problems waiting ...on ebay there is some at 100$ USD, but you need to be sure of the scope model since the resolutions are coded in the bios eeprom of the card ....

author: GGMM
author_rank: Frequent Contributor
timestamp: July 02, 2024, 09:03:27 am
content: Coromonadelix,Thanks for the information.I will no longer focus on making a backup of the disk for now.I modified the wiring of the back light to have it either directly to the ground (Active forced) or via the VGA interface (normal mode)Then I’ll see if there’s anything we can do.I out my old motherboards, it’s really a shame because they are bigger side of the slots.I could have put a motherboard more modern as seen on this forumAnyway I will make a complete uc, exploded mode to clone and save.Anyway, I would have to put back the VGA card of the 54810A because the connection to the IBM disk is not standard.I need a little time to do all this junk again. Lolcdt

author: coromonadalix
author_rank: Super Contributor
timestamp: July 02, 2024, 10:01:14 am
content: well your motherboard as isa and pci slots, so far you have 2 (vga and scope interface) who are pci, do you have other cards like gpib or else who are ISA slots ?on theses the gpib is an isa model, wich can be changed into an pci if you need external control, if not put it asideyou have some compatible motherboards with more punch and peripherals ...a thread with upgrades / mods ...https://www.eevblog.com/forum/testgear/agilent-54835a-scope-%284-channel-1ghz-4gss%29-repair-uphack/

author: GGMM
author_rank: Frequent Contributor
timestamp: July 02, 2024, 07:06:48 pm
content: Coromonadelix,I prepared a motherboardIt is an Asus P5A with K6 500mhz.There are 4 pci slots and 2 isa +AGPI will do a burst mount, the purpose is to recover the data from the IBM diskAs this one is not standard in terms of connectivity, I will put the PCI vga card of the oscillo for connections.Before I will put a 80 GB disk and install unXP.I have on USB key all the cloning softs and the drivers.Then I will quietly transfer to an SSD.The card will not fit in the oscillo because too wide side connector slots.We have to find an ATX baby if I want to improve.It’s a return to the 2000s. LOL. It will rejuvenate us.cdt

author: GGMM
author_rank: Frequent Contributor
timestamp: July 05, 2024, 02:39:35 pm
content: Hello Coromonadelix,I prepared a 64GB SSD with an IDE adapter loaded with windows XP on an another PC.I sacrificed an old power supply to recover the cable +5v, +12v and I soldered it.The setup of the oscilloscope recognizes a hard disk, but does not load because cannot read.In fact, it recognizes anything as a model (80 GB instead of 64GB)I think we need to change the setup, a story of number of heads I think.Good to see.see picturescdt

author: coromonadalix
author_rank: Super Contributor
timestamp: July 05, 2024, 05:39:46 pm
content: normally the IDE AUTO mode should place everything for you ...but a motherboard could reject more modern ssd drive(s)some oldies use IDE SSD with no trim support since some OS'es dont like trim featuresyou could have tried some ide to compact flash, or IDE DOM (disk on modules), they snap directly on ide plugs male or female ... they offer speed and good compatibility, and come with an 5v cabling, i use them in old P3 era pick and place machines with XP ...they exist in sata mode too ... SATA DOM ...

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: July 05, 2024, 11:11:22 pm
content: coromonadalix:Just my 2 cents.....My 54810Windows 9848 MB RAMSpace on disc 29603 of total 30601 MBGeneric IDE 47 DriverMy SSD was partitioned by the fellow I bought it from, Have not looked at the disc itself.I think the machine cannot use a larger disc.

author: GGMM
author_rank: Frequent Contributor
timestamp: July 06, 2024, 07:05:40 am
content: Coromonadelix, Wallace,As the xp was prepared on a other PC , it would crash because some drivers are incompatible. (i think)By the way, it bundles XP, but then crashes even with 64GB partition. I reduced it to 8 GB, it’s the same.I will put a CDROM drive and use hiren, I have already used it. This allows to make a mini XP and adapt the drivers with the new motherboard.Note that the motherboard has signs of weakness, remains on black screen, or booted once out of 10.I tried other ram, same.I’ll take it apart and clean all the contacts, same for the pentium.A machine that combines all possible breakdowns. LOLto be continued....cdt

author: coromonadalix
author_rank: Super Contributor
timestamp: July 06, 2024, 11:15:59 am
content: i would say you have chances it work, if the 1st pc has/had an intel chipset and the mobo scope has an intel chipset,same for amd chipsets from one to another, not amd to intelfor sure it will need drivers, the main one is the intel inf chipset drivers, this one goes first ... you have good chance to start it ...but no offence i do question some of the choices or decisions on how you try to start your rig .... remove all the scope cards and focus on the pc side, i do have doubts on what peripherals this mobo can accept, mostly the ssd technologies involvedsadly i dont have this scope but i would have started a new, fresh install, maybe a new motherboard, but i would have done psu checks, capacitor checks etc ...no offence once again, but you're trying too many things at the same timeyou need to find old ide drives to start the scope, and to recover the drive, it's an ide 44 pins, many adapters / docks / usb to 40-44 pins ide can be used ...you do battles with oldies as i did on a TEK 7404took me 2 weeks just to find floppies, tons of cd-roms, some 2.5" drives etc ... originals cd's (not engraved, they where rejected) .... usb and ide interfaces, and i have a few ... but i succeeded, it was a pain in the b #%$#

author: GGMM
author_rank: Frequent Contributor
timestamp: July 07, 2024, 03:35:39 pm
content: Coromonadelix,I will not spend more time on this vintage Atlas 757 motherboard.First, it starts when its wants, its sometimes takes 10 stops Power on for it to decide. (Even without any card in the slots).It will not please the acquisition board too much. LOLIn addition, there is only 32MB of ram, it must take the mini 64MB for an XP.The ram will cost me more than a more modern motherboard.We find them with the processor and the ram (++1Go) for 10/15 euros.I have to find a Baby-AT style model for it to fit.So il will need to change the power connector for the boardI see adapters, but it’s more ATX (20 pins) to AT (P8 P9) not the other way around. (If you find one, I want the link)I can cut and solder a 20 pin connector. (I have already sacrificed some power to power the cdrom and SSD)A "official " schematic would please me, although one can reason with examples of adapter in other sense.We don’t do new things with old , but we try. LOLcdt

author: coromonadalix
author_rank: Super Contributor
timestamp: July 07, 2024, 05:30:46 pm
content: lollif you switch psu at for atx, or find any temporaries ones with 20 pins ...the main psu connector a 20 pins will work in a 24 pins to do your tests, the 4x supplemental pins where added for more current, unless you do find a mobo who reject that, witch i never foundyou could do some interface cables if you remove your AT connectors on the Atlas and fit them to the atx psus, i had atx mobos and removed the 20 or 24 pin connectors and did a interface cable ...the big change is the new "added 4 pins" for the cpu connector floating cable ... new atx psus now have an supply line for video(s) toosure the Atlas is way overdue, check intel 945 series they had a tons with more or less pci isa, pci only, no isa slots ..... tons of models at very low prices, some will come with cpu and ram ??so far no isa would mean : you loose your gpib interface for sure, i dont recall other isa card in this scope seriepci gpib card are now very expensive thks chinabtw i'm an oldie of 53 years loll i've seen a lot

author: coromonadalix
author_rank: Super Contributor
timestamp: July 14, 2024, 10:55:52 am
content: and if you don't want to put any more time on this .... don't start another thread on the same subject with a title variationthis is your main thread ....

author: GGMM
author_rank: Frequent Contributor
timestamp: July 26, 2024, 04:31:26 pm
content: Hello,I have the option to purchase either a QDI P51430TX titanium IB+ or an ATC motherboard (Trend 7110) for my Agilent 54810AI think they are the right width for a 54810A. The ATX 244mm format is too wide.It’s not the same price (QDI more expensive) but I would like to have your opinion (and your choice ) on these cards (chips, speed ide, etc). It is not for the same processors. I have k6, but no CeleronAnd especially know if it will work well with the infinium software.That would be fine because the EDO ram is very expensive. (I have only 32m edo), i can put 256mo on these motherboards.Thanks

author: GGMM
author_rank: Frequent Contributor
timestamp: September 05, 2024, 05:01:49 pm
content: Hello,I think Murphy’s law follows me... LOL.I had therefore disassembled the Atlas 757 board (From Agilent 54810A) and installed a trend 7110M which allowed me to have a maximum Ram at 256MO.I drew from my stock rams and had put a 128Mo 133Mhz.No boot problems, installation of a 16GB SSD, installation of XP from a DVDrom. Everything was functional.NB: I’m using the VGA output of the motherboard.The card that allows the connection to the power button (which is in theory coupled with the graphics card 65550) is mounted "Flying", only used for connections to start the power.And there after some days, no more screen display, nothing. I put a PC Analyzer card. I have a code C1 00 C3. A problem of RAM.(?)Message C1 00 if you do not put any RAM.I tested with 3 other RAM128MO 133 and 100Mhz. same message.Test with another processor, same.Voltage and OK signals to the oscilloscope on the RAM connectors seem ok.It seems impossible to have 4 rams broken down.I don’t know anymore where to dig, and a lot of trouble to modernize this Agilent 54810A.NB: Of course the mounting studs incompatible with this card are removed to avoid short circuits.some ideas?cdt

author: GGMM
author_rank: Frequent Contributor
timestamp: September 05, 2024, 05:04:47 pm
content: here some links for this mother board if you are interisting...https://theretroweb.com/motherboards/s/a-trend-atc-7110-atc-7110mhttps://www.elhvb.com/mboards/a-trend/manuals/ATC-7110/7110M.pdfcdt

author: GGMM
author_rank: Frequent Contributor
timestamp: October 25, 2024, 08:51:19 am
content: Hello,I was busy with something else since the power outage. Now, I’m resuming my research.So I’m at the same point, the only thing I find is that I do not have the same behavior of the analyzer PC test card, depending on the PCI slot used.But the breakdown is always the same, black screen.I tested with new RAM, other processor, it’s the same.There is 3.3v power supply on the RAM.There are 4 * L3103S mosfet and one L1084S regulator. I will test them.If anyone has the electronic schematic of this card, I am the holder. Trend ATC 7110M.cdt

author: GGMM
author_rank: Frequent Contributor
timestamp: October 27, 2024, 05:06:11 pm
content: hello,I did some more checking today.I confirm that the RAM is well powered.That it is not defective. (Tests made with several memories).Without a schématic, it’s a bit difficult.I still found 2 things.The F837 is very hot. I did not find any documentation. (Regulator??)If anyone finds the documentation, I’m a taker.The L1084S component which is an adjustable voltage regulator, gives 1.25V output, the value of voltage on its adjustable pin is 154mv, and the input voltage is 5v. Don’t heat it up.Documentation here:https://www.alldatasheet.com/datasheet-pdf/view/157328/ETC/L1084S.htmlThe card worked well for several days. As it is a card that dates back 30 years, maybe just a capacitor to be out?. But, nothing to the naked eye (Leak , inflated, etc) no heating.Ideas welcome.cdt

author: GGMM
author_rank: Frequent Contributor
timestamp: October 27, 2024, 05:06:51 pm
content: the second

author: GGMM
author_rank: Frequent Contributor
timestamp: December 21, 2024, 03:48:06 pm
content: hello,After being busy on something else, I started testing again this video card 65550. ref: 54810-66505It’s simple, I tried to insert it into the PCI port of a Daewoo CB656 motherboard, a Gigabyte K8NF9 card, and also another MSI card.The observation is always the same, black screen.If you put also a TEST Analyzer card in an other PCI port, there are only dashes on the display.It worked on the original Atlas motherboard.Some have changed their motherboard from their 54810.An idea?cdt

author: GGMM
author_rank: Frequent Contributor
timestamp: January 31, 2025, 08:59:37 am
content: Hello,I have resumed my tests with my oscilloscope 54810 and its original motherboard Atlas III 757.I managed to get a PCI video card for testing (It becomes rare, it is a trident "Daytona"This starts correctly with this card. I deduce that the original graphics card 54810-66505 blocks the motherboard (bus??).Despite everything, I have a problem with the date (Bios?), it does not support the 2000s.If you put 2025, it will come back to 1925 at the next reboot!The bios date is 06/04/99.Does anyone have a more recent one for this motherboard or a link ?It’s a bit gadget to go back to this famous bug of the year 2000. Lolcdt

author: GGMM
author_rank: Frequent Contributor
timestamp: February 23, 2025, 04:16:20 pm
content: Hello,I am still at the same point with my oscilloscope 54810.I still have this video card pb:I tried to put the original graphics card 54810-66505 in a PCI slot of another "Old" motherboard. This one seems to have blocked the motherboard. (No start, no beep, only dashes on the Analyzer pc card).if I remove it, this "old" motherboard worksNow, I have the same phenomenon on my Atlas motherboard when i put it. Nothing video. If I replace it with a Trident Daytona card, the video appears.I don’t see why, it could have broken down on my original video card.I tested everything I could on this card, found nothing abnormal (Selfs, capacitors, resistors, transistors)After, I could not test the 65550, the memories, and the "rom" HP.I also tested all the PCI port with the oscilloscope, I don’t see much, because the bus doesn’t "turn", so the signals are frozen. But only state up or down.Do you have an explanation, a technical to reset this card?cdt

author: GGMM
author_rank: Frequent Contributor
timestamp: March 19, 2025, 08:10:26 am
content: hello,As said in the vintage computer part, I managed to troubleshoot my ATC motherboardhttps://www.eevblog.com/forum/vintage-computing/old-motherboard-atc-trend-7110m/Now I can work with this motherboard.I connected the video card of the HP54810 to power only and connected the IBM disk. This allowed me to recover all its data that I was able to save on a SSD.It works well when booting with the SSD, and W95 works after asking for all specific drivers of this card. ( media FM801, USB ports, etc...)Why did you simply connect the power supply to this card 54810-66505?In fact this card seems to block the PCI bus and prevents any startup of the motherboardThis seems to exist since the time I had tested it on an ASUS motherboardIs there a component out of service, a specific change to be made in the bios?In any case, if I put a Trident video card it worksWhat PCI signal, can it block the motherboard? nothing special seen at the oscilloscopeAn idea?So I’m stuck at this levelNote: the card 54810-66502 is well recognized on the PCI port, this even required the file HP548XX.vxd for its installation.The software Infinimiun start, There is a normal error because the acquisition board is not connected.cdt

author: GGMM
author_rank: Frequent Contributor
timestamp: March 19, 2025, 10:22:27 am
content: re,I’ve been through the webIt appears that there may be a mismatch with cards (HP? or old?) on the PCI connector and Intel chips of the motherboard.You have to Isolate B5 B6 SMBushttps://superuser.com/questions/105335/installing-pci-e-sata-card-results-in-no-video-on-boothttps://forums.servethehome.com/index.php?threads/hp-331t-network-adapter-on-asus-p9d-m-motherboard.4254/if you have information about this anomalyit’s just a clueif I can get answers from time to time, I feel like I’m making a monologue LOLcdt

author: GGMM
author_rank: Frequent Contributor
timestamp: May 10, 2025, 07:50:51 am
content: hello,Yesterday, I took back my Agilent 54810 and wanted to replace my Atlas motherboard with my A-Trend 71110M Card.This motherboard works perfectly with an ATX power supply (it has the 2 types of power connectors)Once installed, (connection power is done by connectors P8 P9) it does not seem to start (a bit like the Atlas board that seemed to have a random start), I see that the signal "Power Good" is at 78 millivolts!The 5v seemed to be at 5.18V (from memory). I don't know if it's to much?On the power supply, there is no voltage setting (ex potentiometer)I took the acquisition board apart and followed the Power good signal. It arrives on a circuit TL7770-5, which controls the 5v I think.The components around seem good. (résistors)An idea apart from a circuit out of service?Have you the scehmatic of this board 54810-66501? Not surecdt

author: GGMM
author_rank: Frequent Contributor
timestamp: May 11, 2025, 03:21:36 pm
content: hello,First the TL7770 is on the back side of the acquisition board, so you have to take it down to see.So you can’t track the signals once they’re up for testing.Nothing special at eye’s sight.I tried to follow the tracks, but could not see the reset entry from acquisition board.The values are slightly different from the schematic.Apart from changing (Increase ) the value of CT, I do not see what can be done.your ideas are welcomecdt

author: GGMM
author_rank: Frequent Contributor
timestamp: May 12, 2025, 07:58:01 am
content: Hello,It is not easy for me to understand the whole datasheet of this circuit 7770. English is not my native languageCan you tell me the values to have on pins 1 to 7 to have a "good power" signal (value 1--> + 5v) once everything is well stabilized.Explanations would be appreciatedMoreover, I do not have the schematic of the acquisition board which complicates the thing.Thank you, I’d like to bring this scope back to life.help. (see picture)cdt

author: GGMM
author_rank: Frequent Contributor
timestamp: May 12, 2025, 04:55:47 pm
content: re,sorry for all my questions!You will find a picture of this forum on the power.I had written a little earlier in this post, that there was no power setting.It’s a mistake on my part, there are 3 potentiometers.R1 appears to act on 5v (page 6), R2 acts on -5v (page 7) and R3 acts on +12v (pageDo you think after analyzing the power supply pattern, that a signal can force the power signal "power good" on the acquisition board to bad?cdt

author: GGMM
author_rank: Frequent Contributor
timestamp: May 13, 2025, 01:22:55 pm
content: here it is rather the monologueCoromonadelix, you’re the only one to answer, an idea?

author: GGMM
author_rank: Frequent Contributor
timestamp: July 07, 2025, 02:15:23 pm
content: Hello,After 2 months, I resumed the modernization of my Agilent 54810A.To summarize I am:Replacement of the Atlas 757 motherboard with a Trend 71110M (More memory)Switching from IBM disk to a 16GB SSD.It remains to wire the entire audio part (less urgent)To do:Replace the video card 66505 (Broken) Rom Rev 1.0This one is coupled with a 66502 Rom Rev1.0 cardI retrieved a card 66525 and a card 66529.Physically they are the same the original cards, but have a Rom1.1 versionSimple question, can we pair a 66525 with a 66502, or is it absolutely necessary to have a 66525 and a 66502. Rom version compatibility issue?Is there an influence on the program that is on the SSD disk? Modification to do?Thanks for your answers. Ihope.cdt

author: GGMM
author_rank: Frequent Contributor
timestamp: July 07, 2025, 02:21:57 pm
content: sorry an error on text, you have to read:I retrieved a card 66525 and a card 66529.Physically they are the same the original cards, but have a Rom1.1 versionSimple question, can we pair a 66525 with a 66502, or is it absolutely necessary to have a 66525 and a66529. Rom versioncdt

author: sj_phz
author_rank: Newbie
timestamp: July 11, 2025, 01:48:09 pm
content: Quote from: GGMM on July 07, 2025, 02:15:23 pmIf I was an Agilent Engineer designing a card, I'd probably be lazy and reuse as much code + pin outs as I possibly could. I'd likely have been encouraged by Agilent to do this as well, as it would result in faster timelines. Maybe a different driver label when the card enumerates at the BIOS/Windows level. I'd love to learn how to talk to these cards at a low level, maybe draft up a simple program after BIOS where we'd query what devices are enumerating and then maybe address some commands over through PCIE. Maybe someone's already built this.....Bill at Watronics might be able to help you. On his ebay page he advertises free advice. Dude's a designer from HP so he likely knows a thing or two about it.

author: GGMM
author_rank: Frequent Contributor
timestamp: July 11, 2025, 05:00:56 pm
content: Sj_phz,for my 54810aRegarding the card 54810-66529 I cannot put it because the cable coming from the front side is too short and the connector of the acquisition card does not seem the same.So I have a couple 54810-66525 (my 66505 is broken, was rom 1.0) and 54810-66502.So Card 66525 has rom1.1 and card 66502 has rom 1.0The test is ok for the video, all acquisition tests failed...i don’t know if it’s compatible, I haven’t delved more for now and the motherboard is now an Trend 7110Mcdt