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Re: Typo in 2901 SM or wrong value resistor?
I just checked two units, B041697 and B041608. They both have 1k 5% carbon resistors.
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George On Mar 4, 2018, at 6:48 AM, Dave Daniel <kc0wjn@...> wrote: |
Re: Another 455 bad HV multiplier ?
On 2/21/18 12:35 AM, Jeff Woolsey wrote:
I don't see my message detailing earlier progress, so I'll mention itI found the thing that lost its magic smoke:? R553, 100R to ground.? Something tells me I'll fry it again if I replace it.? Indeed, it did.? So what's causing that? -- Jeff Woolsey {{woolsey,jlw}@jlw,first.last@{gmail,jlw}}.com Nature abhors straight antennas, clean lenses, and empty storage. "Delete! Delete! OK!" -Dr. Bronner on disk space management Card-sorting, Joel. -Crow on solitaire |
Re: 7D20 pull tab
At a glance it seems quite different, but maybe I can construct a hybrid.
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On 4 Mar 2018, at 22:46, Dave Daniel <kc0wjn@...> wrote: |
Re: 7D20 pull tab
I seem to recall that someone on this list was or is making pull tabs for 7000-series plug-ins.
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DaveD On 3/4/2018 3:41 PM, Dave Voorhis wrote:
I snapped the pull tab on my 7D20. The knob is intact, but the plastic to which it attaches, isn¡¯t. Anybody parting out a 7D20 and willing to sell the plastic tab? |
Re: Tekmate floppy setup problem.
Hi,
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No, I don't think so. All 3 drives i tested are TEAC FD-235HF, which should be the factory installed ones in the TekMate, and they are 1.44 as far as I can tell. The TekMate specification also mentioned 1.44 drives. I'm using HD floppies. But I can try setting it to 720k and use a SD disk just to make sure. Szabolcs 2018-03-04 20:18 GMT+01:00 Dave Casey <polara413@...>: Are you using 1.44MB disks in 720kB drives? |
Re: Tekmate floppy setup problem.
Are you using 1.44MB disks in 720kB drives?
Dave Casey On Sun, Mar 4, 2018 at 10:35 AM, Szabolcs Szigeti <szigiszabolcs@...> wrote: Hi, |
Tekmate floppy setup problem.
Hi,
Now here is an interesting problem. I have two 2402A Tekmates, for my 2440 and 1430a. I was using one of them with an USB floppy emulator, which works just fine. I have actually never used the floppy drives (both have HDDs), but I finally did find my stack of 3 1/2 floppies, so I wanted to try and use the floppy on the other one, as it is way more col thank the cheep USB emulator :-), and it did not work. It accesses it, but then gets an abort-retry-fail. Ok, no problem, probably the drive is bad. Swapped to an other one, the one that actually came out of the other Tekmate, when I installed the USB drive. That didn't work either. Hmmm. Get a 3rd drive, no luck. Now let's try the floppies in the other Tekmate. They don't work either! I really don't believe that I have 3 failed drives, and the controllers are OK, because the emulator works. Scoping the drive line don't show anything out of order, I see the data coming, drive rotates, head moves, etc. So the only thing I can think is that there has to be some BIOS or whatever setting about the size/type that was lost when the NVRAM battery failed. I have hacked in external batteries, so that is ok. Obviously, the drive is set up as a 1.4M drive in the setup. Am I missing something? Is there any other setting that needs to be there? I really don't believe that all 3 drives are bad, but unfortunately I don't have any other means to test. I have already swapped cables, drives, even controller chips. Not a big problem, but it is bugging me now. Thanks, Szabolcs |
Re: Can I install a 2465B motherboard in a 2445B chassis? What will I get?
Walter Scott :-)
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On 4 Mar 2018, at 15:30, Chuck Harris <cfharris@...> wrote: |
Re: Can I install a 2465B motherboard in a 2445B chassis? What will I get?
Chuck Harris
The ROM's on the A5 board contain everything they need to
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know about being a 2467B, 2465B, 2445B, or 2455B. The A5 controller's are interchangeably the same. You can take one out of any member of the 24[4,5,6]5A or B family, and swap around. The only significant difference has to do with the separate Display board on A's, and early B's. You can swap a controller/display board from an A into a late B, and vice versa, if you want... [The "A" controllers have some ROM omissions for the extra diddly stuff that the "B" can do, and some changes in the calibration routines, battery voltage sensing...] The way the A5 controller knows what scope you have is by reading the P/J512, pin 11, and pin 32. Pin 11 goes with a jumper, W120, which if missing is a 2445B/2455B, if grounded, is a 2465B. P32 determines whether the scope is a 2465B, or a 2467B. The significant difference (board wise) between a 65, and a 67, is the HV power supply board, the 67 board has the control voltages necessary for the MCP. As a result, the 67 Board grounds P32, and passes the signal through the A1 motherboard to P/J512, P32, on the A5 Controller board. The only schematic where Tektronix forgot to erase this information is the analog control <2> schematic for B050000 and above in the 2465B/2467B manual (070-6863-01). Someone once said: "What a tangled web we weave, when first we practice to deceive." One of the girl poets, as I recall. Emily Dickinson maybe? I hope you won't use this information for evil. -Chuck Harris Raymond Domp Frank wrote: On Sat, Mar 3, 2018 at 02:59 pm, Sergey Kubushyn wrote:ISTR that enabling 500 ps/div horizontal speed to a 2445B just takes adding a jumper near the edge of the main board, at one of the connectors. Sorry, don't remember exactly where and I have no doc. where I am at the moment. I trust this'll ring a bell with someone on this forum who has the details. |
Re: Typo in 2901 SM or wrong value resistor?
I took a look and that's what I see. The R364 on the divider board is a 1k resistor and the manual calls out a 100 ohm resistor.
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DaveD On 3/3/2018 6:32 PM, Brian Bloom via Groups.Io wrote:
I'm replacing out-of-tolerance resistors in my 2901 time mark gen and ran across a 1k resistor where the SM says it should be 100R. The resistor in question is R364 on the divider board directly behind Q347. This isn't a model number dependent resistor, but my SN is B041433. |
Re: Can I install a 2465B motherboard in a 2445B chassis? What will I get?
On Sat, Mar 3, 2018 at 02:59 pm, Sergey Kubushyn wrote:
ISTR that enabling 500 ps/div horizontal speed to a 2445B just takes adding a jumper near the edge of the main board, at one of the connectors. Sorry, don't remember exactly where and I have no doc. where I am at the moment. I trust this'll ring a bell with someone on this forum who has the details. Raymond |
Re: Replacement of Tantalum cap removal of U450??
I would probably just clip the leads as you suggested and solder theWherever possible, I try and pull the leads by leaving a length while clipping, heating and pulling the remaining length, for fear of a remaining piece of wire dropping off inside while soldering the new part on top. Raymond |
Dating a 555
I¡¯m trying to approximate the year that my 555 was made. Maybe there¡¯s some way other than just looking at the date codes on components? What I know is the serial number is 601 and the center strip on the scope head is chrome not Tek blue. To be fair I haven¡¯t really poked around too much in the head as I¡¯m working my way the through power supply first. If you have any thoughts or suggestions I¡¯d love to hear them. Oh and the connections are all SO-239 which could be nothing more than an option but I don¡¯t know. Thanks in advance!
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Re: App Notes
Gary
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Curious ..... what is the motivation in this day and age for Tektronix to keep a repository of 30+ year old applications notes? -DC manuals@... On 3/4/2018 12:36 AM, Gary Robert Bosworth wrote:
Thank you Ronald. I hope you can find them. Hard to believe they are not readily available through Tektronix. Why can't Tektronix maintain a repository? --
Dave Manuals@... www.ArtekManuals.com |
Re: App Notes
Thank you Ronald. I hope you can find them. Hard to believe they are not readily available through Tektronix. Why can't Tektronix maintain a repository?
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Gary On March 3, 2018, at 9:13 PM, Ronald Carlson <ronald.carlson.54@...> wrote:
Gary, About 6-7 years ago I found these application notes, or most of them, online. Some are definitive tutorials and give procedures directly applicable to the J16 and its many probes. Pg 7 of the 1981 revision of the instruction manual provides the titles of the application notes. As I recall, I found them in an obscure website and am hunting around for them. Will post links with what I find. Ron |
Re: App Notes
WOW did I miss the mark.
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First I thought I was replying to the HP group. Second I see where my website suggestion seems to have disappeared in a huge string of ¡°stuff¡¯. So, regardless if your interest is HP, TEK or actually numerous other subjects it is worth visiting archive dot org. Ken On 3Mar, 2018, at 10:30 PM, ken chalfant <kpchalfant@...<mailto:kpchalfant@...>> wrote:
Greetings, I am only catching part of this conversation but allow me to suggest: <><> Applying the search term "Hewlett Packard" brings up an enormous amount of material. BTW, applying the search term "Tektronix" also delivers amazing results. Regards, Ken On 3Mar, 2018, at 10:13 PM, Ronald Carlson <ronald.carlson.54@...<mailto:ronald.carlson.54@...><mailto:ronald.carlson.54@...>> wrote: Gary, About 6-7 years ago I found these application notes, or most of them, online. Some are definitive tutorials and give procedures directly applicable to the J16 and its many probes. Pg 7 of the 1981 revision of the instruction manual provides the titles of the application notes. As I recall, I found them in an obscure website and am hunting around for them. Will post links with what I find. Ron |
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