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Re: 2465 - impending U800 failure?
Bob Koller
The first thing, always, is to check the power supply for voltage and ripple, and repair as required. But, the symptom you describe does sound like a failed U800, or, less likely, one of the horizontal deflection plate leads came off the CRT pin. Good Luck! From: cmjones012003 To: TekScopes@... Sent: Thursday, January 17, 2013 1:16 AM Subject: [TekScopes] 2465 - impending U800 failure?
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Hello all,
I haven't posted to this list in a long time but have just been lurking, I'm afraid. One of my trusty 2465s has started to give trouble. It's serial number 102481. I bought it used, surplus about 10 years ago and it's had plenty of hard use since, being my daily workshop scope. I've never even undone the case screws - it's Just Worked, and stayed spot-on accurate. I think the tube is a bit tired, since the trace loses focus at high brightness and it's impossible to get the whole screen (corners and centre) exactly in focus at the same time, though it's always been like that and it's good enough. Yesterday, I switched it on to use it, and it came up as usual but after a couple of minutes the entire display, readouts and all, suddenly jumped off the right hand side of the screen and stayed there. I could just about see the left hand end of the trace by winding the horizontal position all the way over to the left, and the scope was clearly still working otherwise: the bit of trace I could see responded to input signals and adjustments of the controls. I noticed also that pressing the 'beam find' button put the display back in the centre, but shrunken as I'd expect. I tried the scope again a little later on and the display came back, but tried it again today and it worked for a few minutes then suddenly jumped off to the right again. I do have the service manual for it, but before I start digging in, are these the typical symptoms of U800 failure? Searching the group, it seems that U800 failure tends to push the display to the left, and I haven't seen anyone document how 'beam find' behaves in that case. Thank you in advance Chris Cambridge, UK -- http://www.martin-jones.com/ |
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Re: 7104 Horizontal Amplifier
chrismh_somenumber
A Fluke 87V and a Tektronix 2467.
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--- In TekScopes@..., Artekmedia wrote:
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Re: 7104 Horizontal Amplifier
Artekmedia
¿ªÔÆÌåÓýChrisWhat are you using to ( equipment wise ) to measure the voltages? that click momentarily? If the supply voltages are spot on ..time to move on the horizontal Amp Dave ArtekManuals On 1/17/2013 8:36 AM, chrismh_somenumber wrote: ? -- Dave Henderson Manuals@... PO Box 175 Welch,MN 55089 651-269-4265 |
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Re: 7104 Horizontal Amplifier
chrismh_somenumber
Update...
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First, can someone explain this statement to me, from the note between steps C-5 and C-6 on page 4-9 of the service manual: "Look for a power supply where the burst voltage is very low in relation to the specified supply voltage". I'm not sure what I'm looking for there. I have been working my way through the power supply maintenance section. I checked the resistances at the test points specified on page 4-9. They are all OK. The voltages at those test points are spot-on. I moved on the the Rectifier board. I scoped all three of the test points given and they looked OK. I did notice that test point 3 near the I Sense Port (pin 13) of U1275 was about half the amplitude of the waveform given in the service manual. The shape is similar. The waveform also seemed very noisy and it was difficult to get a stable trigger. The voltages on the rectifier board were in the ballpark of those given in the service manual with the exception of the 7.5V at pin 6 of U1274. It was about 6.8v. No idea if that indicates a problem. One other interesting thing I noticed was that probing the 108V test point caused a clicking on the inverter board. It sounds like the power supply is going into pulse mode, but only for a second. Coincident with the clicking, the neon lamp on the inverter board flickered, and the neon lamp on the Z-axis board briefly flashed on and off. Unless someone notices something here that is seriously out of whack, I'll be moving on to the horizontal amplifier board. All input is appreciated, Chris --- In TekScopes@..., "chrismh_somenumber" wrote:
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Re: Sweep generator IC for a Tek1401A Spectrum Analyzer
Hello Tom,
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The part number according to the service manualfor the 1401A, of which I have a copy, is 155-0042-02. The manual does not have any change note for this part. It is an old manual, I guess Looking at the schematic for the Tek 7B53A/7B53AN, a Miller Integrator IC is used at positions U580 and U650 Both positions were 155-0042-03 in the earlier builds. From serial number B191180 onwards they were changed to 155-0028-00. The pin functions appear to be identical (with 1401A) but the voltages/resistor values differ from those in the 1401A. There is a 95++% chance that all these ICs are drop in replacement for each other. I have noted that "Qservice" have the part in stock (155-0028-00). Unfortunately I cannot buy this part from them as they require payment via Paypal, and Paypal does not operate in Pakistan. I can only pay directly through my Visa card, using a secure site. Two other sellers show a stock position but upon inquiry it turns out that their stock is in fact nil. Which is of course typical. Azzy --- In TekScopes@..., "Tom Miller" wrote:
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Re: Tektronix 6 Unit Power Supply
g_kupka
Dennis,
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The seller sent me in advancen a pdf copy(2 MegaByte) of the power supply schematics. The quality is not outstandind but better than nothing. If you are interested, i can send it to you by email. Gerhard --- In TekScopes@..., "Dennis Tillman" wrote:
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Tek 2247a PS question, "What did I do"?
DiPaolo Richard
????? Thank you to all who assisted me on getting a scheme for the 2247a. That's where this group shines :0). I just don't care for when the group gets bogged down in repetitive emails that run into silly mode. ????? I do have another question regarding the 2247a. I removed the top board, saw on the PS there was a push button switch with a long extension on it and I pushed it, put the unit back together and Voi la! The unit is working perfectly! What did I do to make it work? What does that switch do? Was it the connections reset? ????? I paid $125 for a now perfectly working 2247a. This group helped me achieve that!!!!! Thank You!! ? ? ?? All The Best, Rich D. From: David To: TekScopes@... Sent: Wednesday, January 16, 2013 8:55 PM Subject: Re: [TekScopes] Tektronix 2247A service manual needed
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The one here is what I have been using. As far as I know it is free.
You can find the same copy in other places via a Google search: http://www.cnyara.com/_manuals/index.php?dir=Test_Equipment/&sort=size&order=desc On Wed, 16 Jan 2013 11:49:33 -0800 (PST), DiPaolo Richard kathnrich@...> wrote: > Can anyone supply me with a 2247a service manual. I am having some difficulty finding one. |
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Re: Tektronix 6 Unit Power Supply
The part number was no help to me.
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On the rear panel the part number says: CRT ELECTRONIC INSTRUMENTATION INST. #015.015 Dennis -----Original Message-----
From: g_kupka, Sent: Thursday, January 17, 2013 3:11 AM Hi Egge Siert, I get the Power Supply next week and then I'll have the p/n hopefully. Gerhard --- In TekScopes@..., "Egge Siert" wrote: it. Maybe you can search for it when you know the exact Factory/Product Name or PN of it.
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Re: Tektronix 6 Unit Power Supply
Gerhard,
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Welcome to a very exclusive club that has only 3 members that I know of. There is no manual. There is no mention of this unit anywhere on the internet. This unit was not designed to be shipped. The PC boards in the back section will snap their side rails and fall out if they are not removed and marked with their orientation and location first before shipping. Each board is different but nothing prevents them from going into the wrong socket or from being put in backwards. It took me hours before I figured out where mine PROBABLY where before I brought it back to the US in my luggage. I still don't know for sure if I figured out their location and orientation correctly. I have an extensive set of pictures I took of mine which I can send you, which I think, but I am not sure, shows the correct location of the boards. It shows all the other curious details of the unit as well. Dennis -----Original Message-----
From: g_kupka, Sent: Thursday, January 17, 2013 2:44 AM Yes, I bought it. I'll get it next week. Gerhard --- In TekScopes@..., Stefan Trethan wrote: Supply? best regards |
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Re: Type 184 Time Mark Generator Transistor Question
That could be but there is some variation in marker height between
different output settings anyway. On Thu, 17 Jan 2013 08:40:35 -0000, "andersen_bill@..." <andersen_bill@...> wrote:
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Some Suggestions on RF-Connector Brands
Hi to Fred and others,
The problem with new Amphenol connectors is that they don't pop up very often, except their pricey APC (Amphenol Precision Connector)7 Series. Some suggestions: Huber + Suhner (my absolute favorite) Midwest Microwave Narda W.L.Gore (cables) Tektronix 015-xxxx-xx Partnumbers Greetings, Egge Siert |
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Re: Tektronix 6 Unit Power Supply
g_kupka
Hi Egge Siert,
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I get the Power Supply next week and then I'll have the p/n hopefully. Gerhard --- In TekScopes@..., "Egge Siert" wrote:
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Re: Tektronix 6 Unit Power Supply
g_kupka
Yes, I bought it. I'll get it next week.
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Gerhard --- In TekScopes@..., Stefan Trethan wrote:
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Re: Tektronix 6 Unit Power Supply
Stefan Trethan
Did you buy it?
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I briefly considered making a 7k power supply to use as a front end for other scopes but luckily had a bout of sanity when the auction ended and abandoned the idea. ST On Thu, Jan 17, 2013 at 10:58 AM, g_kupka <ghm1@...> wrote:
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Re: 7623A CRT
Mark Wendt
On 01/16/2013 10:58 PM, David wrote:
The floor demo inkjet I picked up a couple years ago does 11x17 duplexAnd if you don't have a large format printer like David's, I've pulled the schematics out of the pdf and taken them to Staples or Kinkos and had them print them out on the 11x17 or larger sheets. They've usually got plotters there too, so if you want to enlarge a schematic, they have the capability. Mark |
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Re: Tektronix 6 Unit Power Supply
g_kupka
Hi Egge Siert,
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Do you know whether a manual exists for the Tektronix 6 Unit Power Supply? best regards Gerhard --- In TekScopes@..., "Egge Siert" wrote:
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2465 - impending U800 failure?
Hello all,
I haven't posted to this list in a long time but have just been lurking, I'm afraid. One of my trusty 2465s has started to give trouble. It's serial number 102481. I bought it used, surplus about 10 years ago and it's had plenty of hard use since, being my daily workshop scope. I've never even undone the case screws - it's Just Worked, and stayed spot-on accurate. I think the tube is a bit tired, since the trace loses focus at high brightness and it's impossible to get the whole screen (corners and centre) exactly in focus at the same time, though it's always been like that and it's good enough. Yesterday, I switched it on to use it, and it came up as usual but after a couple of minutes the entire display, readouts and all, suddenly jumped off the right hand side of the screen and stayed there. I could just about see the left hand end of the trace by winding the horizontal position all the way over to the left, and the scope was clearly still working otherwise: the bit of trace I could see responded to input signals and adjustments of the controls. I noticed also that pressing the 'beam find' button put the display back in the centre, but shrunken as I'd expect. I tried the scope again a little later on and the display came back, but tried it again today and it worked for a few minutes then suddenly jumped off to the right again. I do have the service manual for it, but before I start digging in, are these the typical symptoms of U800 failure? Searching the group, it seems that U800 failure tends to push the display to the left, and I haven't seen anyone document how 'beam find' behaves in that case. Thank you in advance Chris Cambridge, UK -- |
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Re: SEX
--- In TekScopes@..., jerry massengale wrote:
I have always been confused with connector terminology. A standard BNC pip cable has connectors on both ends with what I would call a female shell and a center pin that I would describe as male. I see this called a bnc male. Obviously the center pin names the sex.Jerry, This is an RP-SMA, (reverse polarity) the thing that is half-male and half-female invented for Wi-fi use to avoid people could use regular amplifiers and boost their wifi range. You should avoid anything thet mentions RP for non-Wifi use. For your use, you are searching for something like item 150893862849. Cut and keep the female end to the needed length. |
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Re: Type 184 Time Mark Generator Transistor Question
Thanks for the replies.
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The 184 is up and running. Who ever had been into it turned it into a real mess 5 other transistors on the countdown board had been replaced with the wrong parts. Everthing else in the unit looks original with no repairs to any of the boards. The only thing I notice is the 1us marker is slightly higher in amplitude versus the other markers. ~ 1.95v vs `1.5v on the other markers. I am thinking the 3251 A vs a regular 3251 in Q134 is the cause? Thanks again. B --- In TekScopes@..., "andersen_bill@..." wrote:
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David Hess
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