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Tek 2440 initial troubleshooting
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Hi all,
Got a 2440 w/ attached Tekmate 2402A and the scope appears partially dead. (I detached the Tekmate until the scope is up and running.) S/N is B016685. Graticle lights up when the power button is depressed, Trig'd/Ready/Arm and Slope +/- lights will flash momentarily then the top two will remain lit after some relay cycling occurs. All three GPIB lights are illuminated. There is no trace on screen. Pressing the various Trigger Select buttons do not change Trigger parameters. I'd read that the scope remembers its last state upon power-off and that the Status/Select buttons could be pressed to bring up a 65% intensity display. Tried that; no dice. Is there something else I'm missing before I go diving into this thing and examining the power supply? Seller advertised that it wouldn't power up, though it has a calibration sticker with 9/26/18 affixed to the case...so I'm assuming it worked as recently as last year. Appreciate any tips. ...John... |
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The lights at power up are giving you an error code. Consult the manual to
decode what they are indicating. Last I checked, a very nice scan could be downloaded directly from the Tektronix website for free. Dave Casey On Tue, Apr 2, 2019 at 5:30 PM John Mullens via Groups.Io <johnmullens= [email protected]> wrote: Hi all, |
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When you get it running I have a web page on the Tekmate with
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software, hardware manual links, etc. Did your tekmate come with software? Most of them don't. Tracking down the dso app took me forever. Here's a link to the webpage: Ignore the coming soon links, I'm not doing any more work on it. I got buried under a ton of other projects and I think it would be better to turn a rasberry pi into a tekmate equivalent when I get back to it. Paul On Tue, Apr 02, 2019 at 10:30:26PM +0000, John Mullens via Groups.Io wrote:
Hi all, --
Paul Amaranth, GCIH | Manchester MI, USA Aurora Group of Michigan, LLC | Security, Systems & Software paul@... | Unix & Windows |
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I got the same combo a few months ago, with I think about the same symptoms. The fix was to replace several Ta caps on the top-most board (controller, I think). It's easy to check the power supplies on jumpers and chokes near the right front area. There are maybe ten or so epoxy-molded axial Ta caps sprinkled around the board, mostly toward the back. I found two or three bad, and replaced all with hermetically sealed type Ta ones I had in stock. This cleared the shorts on the supplies, and it came right up and worked just fine.
Just keep checking all the supplies, and lifting any Ta caps found until you get the right one(s). Some were hard to spot at first. There are others in the instrument, but these were the culprits in this case, and fortunately the most accessible of all. I had unplugged the various boards from each other until I had it isolated to this one, before looking at the details. I studied up on the 2402A, and decided it was not worth keeping, so junked it out. Ed |
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On Tue, Apr 2, 2019 at 04:30 PM, Paul Amaranth wrote:
Hi Paul: I read your Webpages on the Tekmate, and found them useful (for the links), and interesting (for the description of the Tekmate/24xx system components and their limitations) Some useful stuff on manuals, DOS, 24xx software, NVRAM, GPIB, and SCSI. Thanks! Best regards |
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Hi,
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I would definitely check the power supply first. These are notorious for dead electrolytics. I have three 24xx DSOs, and all of their PSUs had to be repaired, most of the secondary side caps were dried out or leaking. . So I would first check the power supply voltages and ripple, that can be easily done on the side panel test points. If they are right, then look at the trigger leds, they flash out a n error code in case the scope cannot boot up to a state where it has display. The codes are described in the service manual. If voltages are not right, then look at the PSU. There are test point on the PSU too, and you can also disconnect the rest of the scope from the PSU to see if there are any shorts on the boards pulling down the power rails. Also look out for a pcb mounted fuse in some (maybe the 5V?) output of the PSU. But my first suspect would be the capacitors. If any of they are bad, just go ahead and replace all on the secondary side, do not forget the one for the standby supply of the pwm controller chip. (Sorry, I don't have the service manual at hand, so I cannot tell you component number, but it will be evident from the schematics/theory of operations sections.) Whie you are there, replace the smoke-bomb wifa X caps too...3 Also, it is sometimes easy for some of the board interconnect cables to come loose, definitely check all of them. Szabolcs John Mullens via Groups.Io <johnmullens@...> ezt ¨ªrta (id?pont: 2019. ¨¢pr. 3., Sze, 0:30): Hi all, |
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Hi,
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I have two Tekmates, and both of them came with software, including one with something called DITS, which seem to be some quite complex software to analyze signal integrity for various high speed (then....) digital communicatios. Is there anyone familiar with it? I could get it off the Tekmate, I just need to install a USB floppy emulator, as I was unable to get the floppy working on either of them. I'm actually very puzzled, I have tried 4 different drives, and none of them works with any of the Tekmates, and just cannot figure out why. A floppy emulator works just fine, so it is not the floppy controller, and I could really not imagine that all 4 of my drives are faulty in exactly the same way. The start the read/write but fail. Trying to format fails with bad 0 track and the disk is ruined (needs to be reformatted). This is independent of what i set in the motherboard setup as floppy type. But, maybe, I need to try it with a 5th drive... Szabolcs Paul Amaranth <paul@...> ezt ¨ªrta (id?pont: 2019. ¨¢pr. 3., Sze, 1:30): When you get it running I have a web page on the Tekmate with |
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Probably bad drive belt. I have also had some success back in ze days of acorn with replacing just the drive mechanism with one from a mechanically similar donor.
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Maybe i can find a drive or 3 in my shed? Will you contact me with photos of the mechanism and pcb and i can check. My email should work, its testing underscore h at yahoo dot #include "802701.h" -------------------------------------------- On Wed, 3/4/19, Szabolcs Szigeti <szigiszabolcs@...> wrote:
Subject: Re: [TekScopes] Tek 2440 initial troubleshooting To: [email protected] Date: Wednesday, 3 April, 2019, 8:26 Hi, I have two Tekmates, and both of them came with software, including one with something called DITS, which seem to be some quite complex software to analyze signal integrity for various high speed (then....) digital communicatios. Is there anyone familiar with it? I could get it off the Tekmate, I just need to install a? USB floppy emulator, as I was unable to get the floppy working on either of them. I'm actually very puzzled, I have tried 4 different drives, and none of them works with any of the Tekmates, and just cannot figure out why. A floppy emulator works just fine, so it is not the floppy controller, and I could really not imagine that all 4 of my drives are faulty in exactly the same way. The start the read/write but fail. Trying to format fails with bad 0 track and the disk is ruined (needs to be reformatted). This is independent of what i set in the motherboard setup as floppy type. But, maybe, I need to try it with a 5th drive... Szabolcs Paul Amaranth <paul@...> ezt ¨ªrta (id?pont: 2019. ¨¢pr. 3., Sze, 1:30): > When you get it running I have a web page on the Tekmate with > software, hardware manual links, etc. > > Did your tekmate come with software?? Most of them don't. > Tracking down the dso app took me forever. > > Here's a link to the webpage: >? ? > > Ignore the coming soon links, I'm not doing any more work on it.? I got > buried under a ton of other projects and I think it would be better to > turn a rasberry pi into a tekmate equivalent when I get back to it. > >? Paul > > On Tue, Apr 02, 2019 at 10:30:26PM +0000, John Mullens via Groups.Io wrote: > > Hi all, > > Got a 2440 w/ attached Tekmate 2402A and the scope appears partially > dead. (I detached the Tekmate until the scope is up and running.) > > > > S/N is B016685. Graticle lights up when the power button is depressed, > Trig'd/Ready/Arm and Slope +/- lights will flash momentarily then the top > two will remain lit after some relay cycling occurs. All three GPIB lights > are illuminated. There is no trace on screen. Pressing the various Trigger > Select buttons do not change Trigger parameters. > > I'd read that the scope remembers its last state upon power-off and that > the Status/Select buttons could be pressed to bring up a 65% intensity > display. Tried that; no dice. > > Is there something else I'm missing before I go diving into this thing > and examining the power supply? Seller advertised that it wouldn't power > up, though it has a calibration sticker with 9/26/18 affixed to the > case...so I'm assuming it worked as recently as last year. > > Appreciate any tips. > > ...John... > > > > > > > > > > !DSPAM:5ca3e312319719390710628! > > > > -- > Paul Amaranth, GCIH? ? ? ? ? ? | Manchester MI, USA > Aurora Group of Michigan, LLC? |? Security, Systems & Software > paul@...? ? ? ? ? ? ? |? Unix & Windows > > > > |
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The 2402A and other gear from that era may use the older style 720/800 k FDDs and disks. It could be that you've been trying the later "HD" 1.44 MB drives, which supposedly should work and handle the older disks too, if set up right, but maybe not. I've not had much luck in trying the newer FDDs in old gear - that's why I keep every old-style one salvaged from stuff like this, just for maintenance. Years ago, I had saved some 800k ones from old PCs, and found even they didn't work in my old Data I/O programmers, but I found some info online about modifying them (solder jumper settings) to be backward compatible to 720k.
Ed |
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Hi,
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No, the Tekmate motherboard supports 1.44 drives and I'm pretty sure that those are the original Teac drives, which are capable of 1.44. I did try 700kb disks too, though. Anyway, puzzling and I'll investigate further someday. Until then a cheap USB floppy emulator works fine. Szabolcs Ed Breya via Groups.Io <edbreya@...> ezt ¨ªrta (id?pont: 2019. ¨¢pr. 3., Sze 20:10): The 2402A and other gear from that era may use the older style 720/800 k |
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I looked a little closer at the power-up sequence LEDs after reading the manual - Error 2120; DC OK Fault. Time to look at the supplies.
With regards to the Tekmate website: You're what got me started down this rabbit hole. At one time I had a 2402 and gave it plus a bunch of manuals to a buddy of mine. Will try to retrieve them. Incidentally, the new one has a hard disk instead of a second floppy so it may boot successfully from that. (VGA video card inbound to test.) As far as a Pi emulating a Tekmate: Color me interested. I got hold of an NI RS-232-to-GPIB controller and am going to try same with an old Tandy 102 I have laying around, albeit for purposes of simple instrument control. Will let the group know of any successes and failures. Thanks again for the suggestions. ...John... |
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