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Re: 7403N and 7D01/DF1
Miroslav Pokorni
I did not consider screen burn, but I guess you are right.
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Regards Miroslav Pokorni -----Original Message-----
From: dd@... [mailto:dd@...] Sent: Tuesday, August 14, 2001 9:54 AM To: TekScopes@... Subject: RE: [TekScopes] Re: 7403N and 7D01/DF1 >I do not have here manual for 7104, but I think that 7D01 was listed as a >plug-in not to use. But that's because it would burn the CRT, not because there's not enough power. To unsubscribe from this group, send an email to: TekScopes-unsubscribe@... Your use of Yahoo! Groups is subject to |
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Re: 7403N and 7D01/DF1
Miroslav Pokorni
I will have a stab at it.
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As you probably know, 7D01 is a bad guy, a pig so to speak. It draws much more power than it was envisioned to supply to any plug-in. After 20 years I have hard time remembering whether it was 7D01 or 7D02 that used so much power that Tektronix's way out of that was to set 5 V supply to 4.75 V, as to reduce power drawn (the power supply is a switcher, so you can reduce power). That engineering feat was written up in Electronic Design in second half of 1979 and few months later I had a conversation about that with head of special projects at Tektronix and his words were 'that is something that I am not very proud of'. In addition, I have a military version of 7603N, one without fan; that model has a 60 to 400 Hz transformer in power supply. I was told by Tektronix field people not to plug in 7D01 because mainframe and plug-in might get damaged. I do not have here manual for 7104, but I think that 7D01 was listed as a plug-in not to use. As you can tell, there is plenty of exceptions to 'interchangeability' of plug-ins and you might be seeing a case of 7D01 not getting enough power to function. Regards Miroslav Pokorni -----Original Message-----
From: Doug Hale [mailto:DougHale@...] Sent: Friday, August 10, 2001 10:23 AM To: TekScopes@... Subject: Re: [TekScopes] Re: 7403N and 7D01/DF1 Dean, I don't think that is the problem, charactor readout on my 7904 doesn't work, yet the 7D01/DF1 does work in it. Doug dhuster@... wrote: > Hi, Doug, > > The "N" at the end of a Tek model number indicates that the unit is > not equipped for CRT readout. As I recall, the 7D01 by itself > accesses the mainframe analog character generator (geez, it's been > too long) and it's only when you slap a display formatter onto the > side than you get internal character generation. > > Let's see if I'm right. The folks here will let me know really > quickly if I'm all wet on that one. > > Dean > > > > To unsubscribe from this group, send an email to: > TekScopes-unsubscribe@... > > > > Your use of Yahoo! Groups is subject to ------------------------ Yahoo! Groups Sponsor To unsubscribe from this group, send an email to: TekScopes-unsubscribe@... Your use of Yahoo! Groups is subject to |
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Re: 465M Flaky vertical height.
Miroslav Pokorni
Well Stan, tell us about 'spot-o-gold'. Was that, by any chance, a flex
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Kapton based circuit (flat cable) with gold bumps at the ends and mating connector had gold surfaces and a pressure plate? If that description fits, that is a connector that was put out by Hughes Electronics; apparently, Hughes used it successfully. Regards Miroslav Pokorni -----Original Message-----
From: Stan or Patricia Griffiths [mailto:w7ni@...] Sent: Thursday, August 09, 2001 1:28 PM To: TekScopes@... Subject: Re: [TekScopes] Re: 465M Flaky vertical height. dhuster@... wrote: > I think that it was actually the Berg Miniserts that were the most > troublesome of all the sockets. But they were so danged cute and > since they were individual pins, they could be placed in any > configuration you wanted. I think those were the ones that had some gooey material inside of them weren't they? It wasn't really sticky . . . just flexible like silcone rubber . . . I think it was there in an attempt to keep the pins tight and prevent intermittants. > And it's also likely that most of the intermittents were from non- > gold-plated transistor leads also. I'll bet that is right. When I talked about "cheap vs expensive" sockets, the expensive ones would have been gold plated and I don't ever remember seeing any gold plated transistor sockets in Tek instruments. There were probably some LSI sockets in Tek stuff that were gold plated . . . The best of both worlds would have been gold plated sockets and gold plated transistor leads . . . > I certainly never kept records of what kind of sockets/components > were giving the most problems with intermittents. You never thought > to do that. Just fix 'em and get 'em out the door to keep your > productivity figures high so you can get that raise at the next > performance review. > > Dean I doubt that the factory would have used that info anyway . . . I never kept those records either. There's not a lot you could do about it in the field anyway. What you do or don't do in any job is closely related to what you are praised for or gigged for in any job. I do remember filling out "failure cards" for in-warranty failures but the factory always wanted a clean reason for the failure (or at least a clean "failure") and intermittants just don't fit the ideal failure pattern. The tendency was to not report them since you really did not want to report that you really don't know what fixed the problem . . . I don't remember even a token effort at the factory to try to keep sockets in Tek instruments by testing good vs bad sockets. Frankly, I think it was first concluded to eliminate sockets and then the evidence was gathered to "prove" this was a good idea . . . Like I said earlier, we don't have the data and we will never know . . . Someday, I should tell you about the "spot-o-gold" 7L18 spectrum analyzer ribbon connector problem. It practically killed an otherwise perfectly good instrument. Stan w7ni@... ------------------------ Yahoo! Groups Sponsor To unsubscribe from this group, send an email to: TekScopes-unsubscribe@... Your use of Yahoo! Groups is subject to |
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Re: The 434
dhuster@pb.k12.mo.us
Steve,
Since you rementioned intermittents (my mind was on the T900s and not the 212) that reminds me of a very common source of intermittents in the 200-series. Where two boards interconnect, Tek used square pin connectors. The female side of those connectors had a loose, gold- plated leaf spring that actually made the friction contact with the male end. Often, this little leaf wind up missing somehow -- ZAP! Intermittent connection -- and replacing the female connector would fix the problem. I usually didn't have trouble with the 200-series. I made the "mistake" of seeing a group of them on the incoming shelf at the Dallas Service Center and repaired them all fairly quickly. Pat Morrison quickly "knighted" me as Sir 200-series and I ended up repairing any of the little guys that came in the door, especially after one fairly new tech spent two weeks destroying a 221. My job was to repair that 221 no matter what and after $1800 of labor and parts (the cost of a new 221 and was the other tech's time plus mine, which was severely cut back to around $300 for the customer), it was finally working again. Other than the more rare 213, the 221 was the most difficult of the baby scopes to work on. With no exception, you'd get one repaired and calibrated, put it back in the case and it wouldn't even power up. Take it back out of the case and turn it on and it was fine. Put it back in the case and it would be fine. No explanation. It finally got to where I'd repair and calibrate a 221, put it in the case, not even bother to turn it on, then take it out of the case, then put it back and THEN turn it on for its final check. The 200-series' Achilles Heel was their CRT. It used a filament rather than a heater to save on battery power, and that filament was sooooooo delicate. Customers thought, "cute little football" and tossed it around a little too roughly and would open the filament in the CRT. In 1976, that was a $240 mistake just for the jug alone. The other problem they had was the fact that customers always thought, "little scope, little repair bill". A 212 or 221 nearly always had the same size repair bill as a 465. Dean |
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Re: The 434
Thanx Dean;
--- In TekScopes@y..., dhuster@p... wrote: Steve, the T935 is the delayed-sweep version of the T932.high quality 63/37 solder and a good iron.The ole "ringed joint" syndrome. I'll have to look at that again to be sure it isn't an ongoing prob here. The 212's biggest problem was batteries. And their batteries wereYup, my expensive TEK replacement ni-cads whizzed into the PS board a scant 2 years after installation. Still worked off ext 12V supply after clean-up, but I wouldn't bet the farm on long-term reliability now. The vertical/timebase/trigger board on the side that IThanx! This explains the intermittents neither myself or Bob Garcia could nail down, primarily shielding probs. I've pretty much now decided to retire it to the "cute li'l thingies" shelf anyway. I'll just keep the others going and use the 310A for the portable utility 'scope and the T932 for the bench, the 561,4,&5 for special projects. Best; Steve |
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Re: My trip to France
Phil (VA3UX)
At 09:15 PM 8/13/2001 +0200, you wrote:
Hello! Congratulations on your find Jose. I have just returned from a trip to the 'Cote d'Azur' (Blue Coast) inIt will take any plug-in that begins with the number "1", "53/54", or a plug-in that has a letter designation such as "A", "B", "CA", etc. I do not know of any on-line manuals for any Tek scopes. Phil Best regards from an addict ;-) |
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My trip to France
JOSE V. GAVILA (EB5AGV/EC5AAU)
Hello!
Yes, it HAS to do with Tektronix... just read ;-) I have just returned from a trip to the 'Cote d'Azur' (Blue Coast) in France (I am from Spain and it is about 850km from my home). I have enjoyed a nice week with my wife and my three lovely daughters. So far, so good... But, you know, when you are an addict to anything, you look for it just everywhere. So I asked my french friends (who gratiously hosted us at their home) about some local 'flea markets'... and I was surprised to hear that yes, there was one in Marseille (about 30km from our 'base'). It was on Sunday so, yesterday, I went there. Calling that a 'flea market' is, well, appropriate. It is not a clean place, as there they sell from meal (including alive animals) to... Tektronix gear :-)! Yes, after about two hours looking in trash piles (and, when I say trash I mean exactly that), I saw a nice 545B just facing me, almost hidden in a corner. Poor baby!, I thought. It had been there for long time, I guessed... After some give and take with the seller, I got it for the equivalent to US$50. Probably not a great bargain in other markets but, trust me, in Spain price is at least three to four times that IF you find one. So I gladly paid for it and, helped by my friend Michel, took it home. Well, not so, as it was taken to his home and just today I have got it here (my wife has been really good letting me take this monster home, counting that the car was already full of luggage!) So, once there, after a 9 hour trip (fgrom 6AM to 3PM), what do you think I have been doing lately?. Resting???. No way!. Playing with the new toy, of course! (remember I told you I AM an addict ;-) ). It has a 1A1 plug-in and a non-standard power cable (so first thing I need is a round power plug to match the 545B socket). It has all the knobs in good (but grummy!) shape and is just missing and small ground post which is broken from the base (more about needed parts in a later message, once I look in detail to the baby). But I had not looked inside the unit... and, opening the covers I have found that it is in very good shape :-)!. Everything looks original. It is dusty, as usual, but I have started to clean it and it really shines :-) Now I would like to get some info (a PDF service and/or users manual would be really useful!), as this is my very first 'classic' Tektronix (I own a 475, a 485 and a R7603 with several plug-ins). A list of suitable plug-ins would be also very nice. Any info welcomed! Best regards from an addict ;-) JOSE ---------------------------------------------------------------------- 73 EB5AGV / EC5AAU - JOSE V. GAVILA La Canyada - Valencia (SPAIN) EB5AGV Vintage Radio Site: European Boatanchors List: |
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Re: The 434
dhuster@pb.k12.mo.us
Steve, the T935 is the delayed-sweep version of the T932.
The T912/T921/T922 was plagued with a problem with the female connector on the main board that connects to the power supply. It was always developing cracked/cold solder joints. The cure was to pull the supply out, suck the solder from every terminal of the female connector on the main board and then resolder each, using high quality 63/37 solder and a good iron. However, I've only seen the problem with the three models listed above and not the T93x (why, I don't know) or the T922R (its supply was separate from the main board and connected with a ribbon cable). But it wouldn't hurt to check or even redo even if you don't see a problem. Cracked joints are sometimes difficult to see. The 212's biggest problem was batteries. And their batteries were larger in diameter than "AA" cells, although folks have success with using "AA" NiCds in them. This day and age, I'd switch the eight cells over to NiMH so that you don't get the self-discharge and memory of the NiCds. I have (well, HAD until the batteries ruined the scope during extended storage) that I built entirely from defective parts (I had to make my own output board since those NEVER went bad. The vertical/timebase/trigger board on the side that I used had no fewer than 8 open runs, some on the inner layer that connected to rotary switch contacts through blind vias. Had to trench and lay a wire in between contacts on the switch and carefully solder to the edge of the contact where the wiper didn't travel, being careful not to wet the rest of the pad, then epoxy over the wire and smooth everything out. When I got done, the scope worked great until it went into long-term storage. Dean |
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2215 deflection problem..occurs on many models
walter2@sphere.bc.ca
the 2200 series is notorious for leads popping off the neck of the
CRT (deflection plates) when the bottom board is flexed, the unit is shipped or when somebody works on the scope. the symptom is deflection that won't go past midscreen either side to side or up and down. check that the neck wires to the deflection plates are all connected! with on emissing plate, the deflection will be only partial screen, and often is distored. this also commonly happens on the 465M and numerous other models, becaus ethe deflection wires are literally tight, and even a small shock can pull them off the neck pins. regards, walter |
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Re: HP400E
Phil (VA3UX)
Good work Don. Thanks
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Phil At 11:41 PM 8/12/2001 +1000, you wrote:
Oops! The link to the test equipment site is |
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Re: HP400E
Don Black
Oops! The link to the test equipment site is
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<> . Just as well the old head's screwed on tightly, I'd forget that too. Don Black. "Phil (VA3UX)" wrote: Please read below folks. Can anyone help out Will with a schematic ? |
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Re: HP400E
Don Black
Hi Everyone,
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Here's a link site for test equipment schematics and manuals. I've posted it here as I think it's worth everyone bookmarking it for future use. It has the HP400 manual to download in PDF format. I haven't downloaded it all myself but it should be what Will is after. Hope it helps. Don Black. PS The Tektronix 564 link is to the closed down Tek Museum, if anyone needs help with this, email me, I may be of limited assistance. "Phil (VA3UX)" wrote: Please read below folks. Can anyone help out Will with a schematic ? |
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Re: 2215 trace problem
I don't know if this will translate to your situation, but my eBay 465 did
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the same thing (first vert then horiz and then I had to fix it) and I found overheated and open resistors in both vert and horiz amps. There were no other bad parts. Easy fix if that's your problem. You may notice the board dis-colored under the parts in question. Peter Florance audserv@... -----Original Message-----
From: wjordan [SMTP:wjordan@...] Sent: Saturday, August 11, 2001 10:05 AM To: TekScopes Subject: [TekScopes] 2215 trace problem I have a tek 2215 on which both traces will not go lower than about 1/3 rd from the top of the screen. any help is appreciated WDJ To unsubscribe from this group, send an email to: TekScopes-unsubscribe@... Your use of Yahoo! Groups is subject to |
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HP400E
Phil (VA3UX)
Please read below folks. Can anyone help out Will with a schematic ?
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Please reply directly to him. Sorry Will but I don't have a schematic for the 400E. Phil Date: Sat, 11 Aug 2001 19:26:16 -0700 |
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DP501/DC503A/TR503 combo ok?
donlcramer@cs.com
Hello all,
I have a DP501 prescaler, plus a TR503 tracking generator for use with a 496 spectrum analyzer. I understand that a DC503A is one counter that will hook up to a DP501, and with logic signals routed through the TM500 rear interface, allow the counter to read the correct 16x prescaled input frequency. I also understand that the DP501 will hook up to a TR502 (the TG meant for the 7Lxx series) also using the rear interface (so that no front panel cabling is needed). I further find that the DC508A opt 007 (I think that was the option number--maybe I'm thinking of His Majesty's Secret Service) counter was the one typically used with the TR503 tracking generator. Unfortunately, I been able to get a DC508A yet. I have a shot at getting a DC503A. Which brings me to my question: I am unclear from reading my manuals whether the DP501/DC503A/TR503 will all sing together properly, and by using only the rear edge card interface of my TM506A to link them together. Any clarification here greatly appreciated. Don Beaverton, OR |
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Re: Vintage Tek scopes anyone
Stan,
I have bought from you on eBay a couple of times. Sorry I can't help with the 3A2 / 3B2. I am also looking for some 56x series plug-ins: 3A8 3A9 3S1 3S7 / 3T7 (ideally the pair with GR interconnecting cable) 3L5 (ideally with the companion Frequency Converter, Tek 015-0107-00) 3L10 Other odds and ends I am looking for: One 561 CRT bezel and nuts (to replace a camera adapter). One locking mechanism for a 56x plug-in "Fastener, pawl right w/stop" Tek 214-0052-00. I am a retired IBMer (33 years service starting as a tech and ending as a technology and competition consultant to marketing). IBM sure bought a lot of Tek scopes, particularly the 453 which was the mainstay for the System/360 line of computers in the 60s and 70s (I don't think I ever saw a broken one). My first decent scope was a 561A/3A1/3B1, although I have actually used a 310 and before that the dreadful Waterman. I recall making a change to the 3B1 in the 60s. It had one bad characteristic: when switching from Intensified mode to Delayed Sweep mode, the reset of the delaying time base was changed to a "B ends A" mode. This could cause the delayed display to be different from the intensified display if the delaying time base was triggering on a pulse train. I lifted one end of C103 on the normal sweep generator to prevent this behavior. I guess someone at Tek had the same idea, because I have just looked at my recently acquired 3B3 manual, an lo and behold that circuit is gone! Test equipment is now one of my hobbies and I have a good 56x collection. Regards, Cliff Carrie From: Stan or Patricia Griffiths <w7ni@...> _________________________________________________________________ Get your FREE download of MSN Explorer at |
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