Rick, Maybe not the solution to your particular problem but for $5.00 (on AliExpress) or $10 (on Amazon) you can get an amazingly useful 25 MHz, 8 channel logic analyzer.
You can use it with sigrok, free software that comes with a large number of protocol decoders. I just got one and I have used it quite a bit in the last couple of months to troubleshoot serial data issues with a UART and I2C issues that would have been extremely hard or impossible with my digital storage oscilloscope. It's not a replacement for a scope but a very useful complement and far and away the best $5 I have ever spent on anything. It may not be useful when troubleshooting buses wider than 8 bits or faster than a few MHz but everyone should have one of those. For a few $ more, they do have faster, 16 bit models. Didier KO4BB On Mon, Apr 20, 2020, 1:33 PM Rick Bale <[email protected]> wrote: > I's been a while since I last posted on my 7081. I needed to wait to > receive new earthy CPU and DMA chips. They are cheap and easy to swap. So > far, with Joe's help, I've replaced the earthy side PROMS. Also new is all > the RAM, DMA and microprocessor. I also went back and rechecked all the > power rails. I found a little extra noise on the +5v & +40v power rails. > I corrected this by replacing C56, C57, C58 filter caps. They all measured > about 50% or less of their original uF. The 12v filter C59 was okay. > > I have the same symptom of all LED stuck on and nothing on the screen. I > feel like I need to check the data during boot up. Probably means decoding > the logic. Maybe it's hung on a reset since all the LEDs are on. It would > seem reasonable that they would all come on during boot up or on a reset. > The problem is I don't have a logic analyzer or probe but mainly don't > really know where to start in the circuit. > > Does anyone have any suggestions on where to start. Do you think I should > move the conversation to the Solartron Group? > > Thanks, Rick > > > > > ---------------------------------------------------------------------- > > > > Message: 1 > > Date: Wed, 8 Apr 2020 13:23:17 -0400 > > From: Rick Bale <[email protected]> > > To: [email protected] > > Subject: Re: [volt-nuts] Solartron 7081 > > Message-ID: > > < > > cad2mu-meqokcshn2ljj4ako1whteuyk2mdjurg51pyhmsgn...@mail.gmail.com> > > Content-Type: text/plain; charset="UTF-8" > > > > Thank you David that is good information. This is good news is I have > the > > correct PROMs. My board is the 70810504X with 2564 PROMs. Joe has > > programmed up a new set of PROM's plus I have the old ones. > > > > I'll reassemble the unit after doing an alcohol scrub down on all the > > boards because there evidence of water damage on the top cover's shield. > > It's turned the shield green and has a mildew smell. Joe saw some > corrosion > > on the old PROMs too. In the long run I'll need to replace the cover's > > inside shield. I should be able order a custom one from a PCB shop as > it's > > just a large un-etched tin coated PCB board. > > > > If the cleaning doesn't work then it seems like I need to find a test > point > > to monitor the boot up data stream. Does that seem like a good place > > to start since power rails are good? Is it best to watch it from the GPIB > > connection? > > > > Rick > > > > > > > > > Message: 2 > > > Date: Wed, 8 Apr 2020 14:17:52 +0100 > > > From: "David C. Partridge" <[email protected]> > > > To: "'Discussion of precise voltage measurement'" > > > <[email protected]> > > > Subject: Re: [volt-nuts] Solartron 7081 > > > Message-ID: <[email protected]> > > > Content-Type: text/plain; charset="us-ascii" > > > > > > There is a downloadable high quality scan of the Service Manual which I > > > produced a while ago, that you can download from here: > > > > > > < > > > > > > https://groups.io/g/Solartron_Schlumberger_Equipment/files/Solartron%207071 > > > %20and%207081 > > > < > > > https://groups.io/g/Solartron_Schlumberger_Equipment/files/Solartron%207071%20and%207081 > > > > > > > > > > > > > It has the schematics for both the early (7504) and late (7514) earthy > > > processor boards, and contains numerous corrections to the text and > parts > > > lists. The schematics have been cleaned up and corrected where > > necessary. > > > > > > You can tell which ROMS the earthy processor uses based on the board > > > number: > > > Board 70817504 uses 2564s while 70817514 uses 2764s. > > > > > > If you use the wrong ROMs - it won't work! > > > > > > The Test Spec document is also of interest. > > > > > > Keep well > > > D > > > > > > -----Original Message----- > > > From: volt-nuts [mailto:[email protected]] On Behalf Of > > > Rick > > > Bale > > > Sent: 08 April 2020 13:45 > > > To: [email protected] > > > Subject: [volt-nuts] Solartron 7081 > > > > > > All, > > > > > > Here's an update on my 7081 that hangs during boot up > > > > > > > > > > > > > > > ------------------------------ > > > > > > Message: 3 > > > Date: Wed, 8 Apr 2020 14:29:09 +0100 > > > From: "David C. Partridge" <[email protected]> > > > To: "'Discussion of precise voltage measurement'" > > > <[email protected]> > > > Subject: Re: [volt-nuts] Solartron 7081 > > > Message-ID: <[email protected]> > > > Content-Type: text/plain; charset="us-ascii" > > > > > > Grrr why was my link split across two lines - it was sent as one line > ... > > > > > > Be warned you'll need to re-constitute the link ... > > > > > > David > > > > > > -----Original Message----- > > > From: volt-nuts [mailto:[email protected]] On Behalf Of > > > David > > > C. Partridge > > > Sent: 08 April 2020 14:18 > > > To: 'Discussion of precise voltage measurement' > > > Subject: Re: [volt-nuts] Solartron 7081 > > > > > > There is a downloadable high quality scan of the Service Manual which I > > > produced a while ago, that you can download from here: > > > > > > < > > > > > > https://groups.io/g/Solartron_Schlumberger_Equipment/files/Solartron%207071 > > > %20and%207081 > > > < > > > https://groups.io/g/Solartron_Schlumberger_Equipment/files/Solartron%207071%20and%207081 > > > > > > > > > > > > > It has the schematics for both the early (7504) and late (7514) earthy > > > processor boards, and contains numerous corrections to the text and > parts > > > lists. The schematics have been cleaned up and corrected where > > necessary. > > > > > > You can tell which ROMS the earthy processor uses based on the board > > > number: > > > Board 70817504 uses 2564s while 70817514 uses 2764s. > > > > > > If you use the wrong ROMs - it won't work! > > > > > > The Test Spec document is also of interest. > > > > > > Keep well > > > D > > > > > > -----Original Message----- > > > From: volt-nuts [mailto:[email protected]] On Behalf Of > > > Rick > > > Bale > > > Sent: 08 April 2020 13:45 > > > To: [email protected] > > > Subject: [volt-nuts] Solartron 7081 > > > > > > All, > > > > > > Here's an update on my 7081 that hangs during boot up > > > > > > > > > _______________________________________________ > > > volt-nuts mailing list -- [email protected] > > > To unsubscribe, go to > > > http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com > > > and follow the instructions there. > > > > > > > > > > > > > > > ------------------------------ > > > > > > Message: 4 > > > Date: Wed, 8 Apr 2020 13:33:48 +0000 > > > From: Shaun Merrigan <[email protected]> > > > To: Discussion of precise voltage measurement > > > <[email protected]> > > > Subject: Re: [volt-nuts] Solartron 7081 > > > Message-ID: > > > < > > > > > > mwhpr22mb0142778e26799873fc21114bda...@mwhpr22mb0142.namprd22.prod.outlook.com > > > > > > > > > > Content-Type: text/plain; charset="Windows-1252" > > > > > > Rick, > > > > > > I have two 7081?s with the relevant configuration as follows: > > > > > > S\N 1395 with board 70817514 and 2764 ROMS > > > S\N 415 with board 70817504 and 2564 ROMS > > > > > > I can also confirm that swapping ROMS between the board revisions does > > not > > > work. > > > > > > Hope this helps. > > > > > > Shaun Merrigan > > > https://www.shaunmerrigan.info > > > > > > ________________________________ > > > From: volt-nuts <[email protected]> on behalf of David > C. > > > Partridge <[email protected]> > > > Sent: Wednesday, April 8, 2020 7:17:52 AM > > > To: 'Discussion of precise voltage measurement' < > > [email protected]> > > > Subject: Re: [volt-nuts] Solartron 7081 > > > > > > There is a downloadable high quality scan of the Service Manual which I > > > produced a while ago, that you can download from here: > > > > > > < > > > > > > https://groups.io/g/Solartron_Schlumberger_Equipment/files/Solartron%207071 > > > %20and%207081 > > > < > > > https://groups.io/g/Solartron_Schlumberger_Equipment/files/Solartron%207071%20and%207081 > > > > > > > > > > > > > It has the schematics for both the early (7504) and late (7514) earthy > > > processor boards, and contains numerous corrections to the text and > parts > > > lists. The schematics have been cleaned up and corrected where > > necessary. > > > > > > You can tell which ROMS the earthy processor uses based on the board > > > number: > > > Board 70817504 uses 2564s while 70817514 uses 2764s. > > > > > > If you use the wrong ROMs - it won't work! > > > > > > The Test Spec document is also of interest. > > > > > > Keep well > > > D > > > > > > -----Original Message----- > > > From: volt-nuts [mailto:[email protected]] On Behalf Of > > > Rick > > > Bale > > > Sent: 08 April 2020 13:45 > > > To: [email protected] > > > Subject: [volt-nuts] Solartron 7081 > > > > > > All, > > > > > > Here's an update on my 7081 that hangs during boot up > > > > > > > > > _______________________________________________ > > > volt-nuts mailing list -- [email protected] > > > To unsubscribe, go to > > > http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com > > > and follow the instructions there. > > > > > > > > > ------------------------------ > > > > > > Subject: Digest Footer > > > > > > _______________________________________________ > > > volt-nuts mailing list > > > [email protected] > > > http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com > > > > > > > > > ------------------------------ > > > > > > End of volt-nuts Digest, Vol 125, Issue 1 > > > ***************************************** > > > > > > > > > ------------------------------ > > > > Subject: Digest Footer > > > > _______________________________________________ > > volt-nuts mailing list > > [email protected] > > http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com > > > > > > ------------------------------ > > > > End of volt-nuts Digest, Vol 125, Issue 2 > > ***************************************** > > > _______________________________________________ > volt-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com and follow the instructions there.
