开云体育

That part is used in several early 7000-series time bases.
7B50A and 7B53A are examples. A while ago, while still available, these

plugins could be had for a few $$.

Thanks for the info - i may even buy a whole timebase to part out in the
worst case.

You may want to check the circuits around the IC before replacing because

it could be the victim of a failure, not the source.

Yes, i will be sure the surrounding circuits are perfect before plugging in
new. Thanks!

The scorching hot IC is part number 155-0049-01 and called a 'sweep generator.'

That part is used in several early 7000-series time bases.
7B50A and 7B53A are examples. A while ago, while still available, these plugins could be had for a few $$.

IYou may want to check the circuits around the IC before replacing because it could be the victim of a failure, not the source.

Raymond

I change the path name to include recap that's why older email links no longer working?

Sent from Yahoo Mail on Android

I own a 2465 which exhibited non-linear vertical traces for Ch1 and Ch 2.
I traced the problem to failed -8 Volts from the LVPS. In particular, 1101.
I recapped and all was well. Still using the scope.

Thanks for that info, Mac. I based my response on what I remember of the (all too frequent) messages of vertical compression, from the middle increasing towards the top of the screen, for channels 1 and 2 only, as seen on this forum.
Did I miss your issue here?

Raymond

If I follow you correctly the 1,2,5 part gain changes but the decade function provided by changing the current sense resistor doesn't. That is switched by the b section of sw400 which is the wafer switch on the back of the cam switch.. Is that moving when you change vert sens?

A cheap USB oscilloscope will work to check ripple however so will a
voltmeter set to AC mode.

What sweep IC are you referring to?

Thanks for the tip on ripple and testing with a voltmeter. I found that as
an option after some digging later but didn't know if it would be accurate
enough to make diagnosis.

The scorching hot IC is part number 155-0049-01 and called a 'sweep
generator.' Here's one source
but it seems to be unavailable from there and out of stock on another site
here: I believe it's
U870 in the manual and someone with a similar issue mentioned it here:



I've confirmed a dead -8 volts at the regulator so my next steps are to
test and likely replace the rectifier.But it's hard to keep up my
enthusiasm on careful part swapping if that IC is unobtanium. I'd be fine
fixing the power supply and waiting out availability but disappointing when
the part cross reference sheet has only 4 components that don't have a
common replacement!

Thanks for your help! I can tell after a half a day the brainpower in this
group is great and even if I have to put this Tek project on hold I'm sure
I'll get a working one soon.

I have a collection of scopes, about 1/2 are Tek. This last weekend was very wet and humid. I fired up one of my 'brand X' (100 MHz) scopes to work on a preamp and was surprised to see the focus was very blurred. Could not get it sharp. Turned it off, suspecting problems.
Went back out today and since the weather had turned warm and dry, the scope focus sharpened up nicely....
First time I've seen that. Scope has a plastic dust cover on it.
FWIW

ron
N4UE

I own a 2465 which exhibited non-linear vertical traces for Ch1 and Ch 2.? I traced the problem to failed -8 Volts from the LVPS.? In particular, 1101.? I recapped and all was well.? Still using the scope.

From: "hewpatek@... [TekScopes]" <TekScopes@...>
To: TekScopes@...
Sent: Wednesday, March 30, 2016 11:11 AM
Subject: [TekScopes] Re: 2465B U400 Availability?

? > Only Channels 1 and 2 exhibit vertical linearity issues.

I haven't seen a case lately where U400 was *not* the culprit with these symptoms.

It's not abnormal for a higher BW 'scope to be a bit more noisy, resulting in a slightly thicker trace,

Raymond

[Non-text portions of this message have been removed]

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[Non-text portions of this message have been removed]

Gentlemen,
Thank you for the help ! I did some more signal tracing and found a poor/bad connection of the z-amp to the high voltage supply. I have attached two test reports -"horz-output-20us" and "horz-output-.1s." I think this output is correct.
I may be generating more problems then I am fixing. After I fixed the z-amp output I did not get a trace, when the beam finder depressed there was a trace on the left to about the center, with a shorter trace above. (Originally, I had a centered trace covering about 1/3 of the screen, so something changed.) I had to take a break and powered down when I came back and powered up, I got no trace at all with the beam finder depressed. No smoke , no unusual sound , no visual I could find. The "Troubleshooting Your Oscilloscope" Asks to check the the HV oscillator, I have no idea as to how to check the HV oscillator. My test equipment can only handle 1000v. I did check the filament voltage and it was 6.3v. I am very reluctant to do much on the HV board. I do have an older HV board and CRT. I think I am playing a game of Whack'um. No what?
Thanks, Charlie



crpederson@...

From: David davidwhess@... [TekScopes]
Date: 2016-03-27 11:51
To: TekScopes
Subject: Re: [TekScopes] Re: 5440 low-voltage power supply

On 27 Mar 2016 03:45:18 -0700, you wrote:

So that leaves a z-axis problem. I do not think it can be just a
timebase unblanking problem because that should not affect the
readout. >

No readout either? I thought you just missed the trace. If no readout either, David is right of course and my grid bias adjustment won't help.

Raymond

The grid bias adjustment applies to any trace and the readout and it
also applies to the beam finder. Of those only the beam finder works.

It (the grid bias) is still worth messing with. It is not difficult
to set correctly if it is misadjusted.

On 31/03/16 01:05, dieselchair@... [TekScopes] wrote:

Wow, I'm still not used to yahoo groups. I have yet to figure out how to quote messages. ^^;;

I reply using use my normal email program (seamonkey/thunderbird, but that's not important), and let it do the quoting. I also delete the "pretty picture" that Yahoo adds at the bottom, which I presume is the source of the "line noise" in some postings.

The other trick is to "send in plain text only" - not "html" nor "html and plain text".

Wow, I'm still not used to yahoo groups. I have yet to figure out how to quote messages. ^^;;


On 28 Mar 2016 12:26:24 -0700, you wrote:

>>There's no difference when turning on the 20 MHz limit. I do see something that bothers me on one of the connections to the CRT. If I can capture a picture of it I'll post it.


>Four things occur to me which could cause this:

>1. The CRT may be old. When you turn the intensity up, does the trace
spread before becoming bright? Check for double peaking where the
brightness dips as the intensity is increased.

>2. Ripple on the -2450 volt cathode supply would vary the horizontal
and vertical deflection making the display look fuzzy away from the
center. The one photograph does not show this so I do not think this
is the problem. You could carefully look for ripple on cathode supply
using a high voltage capacitor and precharge resistor to coupling it
to an oscilloscope probe.

>3. Could there be an external AC magnetic field? Check the location
of the oscilloscope for this. Is the CRT shield in place?

>4. Noise on both the horizontal and vertical CRT outputs could cause
this. Disconnecting the vertical CRT leads will reveal if this is the
case.


The trace brightens up very quickly and no dips that I can see. It starts to widen just a little when turned all the way up ( I de-focused the trace and did that very quickly. Turning the intensity up high makes my skin crawl. ~shivers~ )

I'm not sure yet if I would try that. You say precharge resistor? In parallel with the HV capacitor?

The only other gear on the bench is the leader scope and my Keithley DMM. Also I did power on the scope in a different room when I first got it.

I Disconnected the vertical CRT leads and the trace curved a little but it showed no difference in thickness. The vertical pins on the CRT look a little crusty to my eye. I'm going to double check for noise on the LV connections to the CRT and then check the physical connections.

7J20?! ? ("Dibs!" if one should be available!!).
? Dan

Any non 7K plugins? You wouldn't happen to have a 3T2? My 3S2 is lonely......

Cheers....

On Wed, Mar 30, 2016 at 7:50 PM, Peter Gottlieb hpnpilot@...
[TekScopes] <TekScopes@...> wrote:

7CT1N?


Peter

On Mar 30, 2016, at 11:19 AM, Jim Reese nfeinc@... [TekScopes] <TekScopes@...> wrote:

Hello to all again!
Jim Reese from Dayton, Ohio back in action. I am going through the piles of stuff and have many 7K plugins available at low prices. All have had basic function testing in a 7704A unless otherwise noted. Add shipping from zip 45344.
7A16A, $207A18, $307A26, $407B50A, $307B51A, $357B92A, $50 7B92A non-working (short on power supply line, probably bad capacitor), $25
I have many others available that I have not gotten too yet that I will post later. Let me know of anything you are looking for.
Regards,
Jim

------------------------------------
Posted by: Peter Gottlieb <hpnpilot@...>
------------------------------------


------------------------------------

Yahoo Groups Links

7CT1N?


Peter

On Mar 30, 2016, at 11:19 AM, Jim Reese nfeinc@... [TekScopes] <TekScopes@...> wrote:

Hello to all again!
Jim Reese from Dayton, Ohio back in action. I am going through the piles of stuff and have many 7K plugins available at low prices. All have had basic function testing in a 7704A unless otherwise noted. Add shipping from zip 45344.
7A16A, $207A18, $307A26, $407B50A, $307B51A, $357B92A, $50 7B92A non-working (short on power supply line, probably bad capacitor), $25
I have many others available that I have not gotten too yet that I will post later. Let me know of anything you are looking for.
Regards,
Jim

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

On Wed, 30 Mar 2016 13:32:52 -0500, you wrote:

...

Fan and lights work, knobs in good shape. Very complete scope but the sweep
IC gets super hot.

...

So far I've confirmed a solid +55v rail, +15v rail and a drooping +5v and
no -8v with my DMM. The +5v droop goes away if I isolate the horizontal amp
board by pulling the connector. I posted on the EEVBlog forum and got a
response saying to check the ripple as well; seems I need another (working)
scope? Any hope that a cheap USB scope (opposite end of spectrum from this
beast!) would suffice?

A cheap USB oscilloscope will work to check ripple however so will a
voltmeter set to AC mode.

What sweep IC are you referring to?

---In TekScopes@..., <davidwhess@...> wrote :

On 28 Mar 2016 12:26:24 -0700, you wrote:

There's no difference when turning on the 20 MHz limit. I do see something that bothers me on one of the connections to the CRT. If I can capture a picture of it I'll post it.

Four things occur to me which could cause this:

>1. The CRT may be old. When you turn the intensity up, does the trace
spread before becoming bright? Check for double peaking where the
brightness dips as the intensity is increased.

>2. Ripple on the -2450 volt cathode supply would vary the horizontal
and vertical deflection making the display look fuzzy away from the
center. The one photograph does not show this so I do not think this
is the problem. You could carefully look for ripple on cathode supply
using a high voltage capacitor and precharge resistor to coupling it
to an oscilloscope probe.

>3. Could there be an external AC magnetic field? Check the location
of the oscilloscope for this. Is the CRT shield in place?

>4. Noise on both the horizontal and vertical CRT outputs could cause
this. Disconnecting the vertical CRT leads will reveal if this is the
case.


The trace brightens up very quickly and no dips that I can see. It starts to widen just a little when turned all the way up ( I de-focused the trace and did that very quickly. Turning the intensity up high makes my skin crawl. ~shivers~ )

I'm not sure yet if I would try that. You say precharge resistor? In parallel with the HV capacitor?

The only other gear on the bench is the leader scope and my Keithley DMM. Also I did power on the scope in a different room when I first got it.

I Disconnected the vertical CRT leads and the trace curved a little but it showed no difference in thickness. The vertical pins on the CRT look a little crusty to my eye. I'm going to double check for noise on the LV connections to the CRT and then check the physical connections.

Hey y'all,

so I'm starting to play around with this. It's trivial to expose IO ports
at dosemu, and the NI-PCIIA card is documented to pieces <
www.ni.com/pdf/manuals/320045.pdf>. There's even a whole section on how the
cards are supposed to be acceptance tested, listing register writes and
test reads, which should make it easy to test the virtual board
implementation.
The bus protocol is quite well described at <
>, but what I'm having trouble
with is wrapping my head around the internal state of the NEC uPd7210, how
it relates to the bus state, and how it's used to actually communicate with
other GPIB devices.

It would be nice to have a sample of the beast to play with and compare to,
but I haven't found any reasonable suppliers for it. Anyone?

Siggi

On Thu, 4 Feb 2016 at 16:10 Sigur?ur ?sgeirsson <siggi@...> wrote:

Hey y'all,

I've seen a couple of threads on EEVBlog and the Tek forum where people
claim to have hacked dosemu to emulate the NI GPIB card(s). Presumably this
forwards the GPIB calls to Linux-GPIB.
This would allow running TekMate and the TDS field adjust software on
contemporary hardware. I've tried to contact the people who made these
claims a couple of times without success.
I've looked into what this takes a little bit, and it looks pretty trivial
to emulate the hardware, but I'm too much of a GPIB noob to make headway on
the translation by myself.
I've mainly played with this because I'd love to be able to take a look at
TekMate hooked up to my 2430, and one day I'm sure I'll have to run the FAS
at my TDS784D :).

Have any of y'all done this, or know of code drops related to this that I
could work from?

Siggi

[Non-text portions of this message have been removed]

Someone at Tek had a sense of humour; the photo clearly indicates the scope is dead: x_x

(think cartoon characters with x'd out eyes)

Hello TEK 1502 experts.
The slow ramp does not seem to function.With the logic boar connected?there is a slow trace on switch on, as though the print switch was pressed, which does not repeat/ fly-back.When the print switch is pressed, then a slow trace is initiated?- again without fly back.The default, slow ramp generated, trace is not available. ... only the more complicated, logic board generated, trace.
With logic board disconnected and the print switch re-routed, as described in?my (August 1982) ?instruction manual, a slow trace is available only on switch on, it does not repeat when the switch is pressed.
The instruction manual does not give detailed (scope type) data relative to the test points available on board A3, vert amp/ slow ramp - which is a pig to get at.
The board does not have pluggable semi conductors.
All voltages are correct.Everything else appears to function.
So before I attempt major surgery, is there something I have missed that gives me a fix?

Clive

[Non-text portions of this message have been removed]

Cal labs are pretty thorough.? My advice for checking voltages is that a new U400 could fail if the circuit has severe problems.? I always check the circuit before installing a new part unless the part is plentiful and cheap.

From: "Barry n4buq@... [TekScopes]" <TekScopes@...>
To: TekScopes@...
Sent: Wednesday, March 30, 2016 3:46 PM
Subject: Re: [TekScopes] Re: 2465B U400 Availability?

? I've only played around with it briefly, but I'm pretty sure both cursors move smoothly. Everything seems to be pointing to U400 but have not checked voltages yet.

Previous owner had taken it to a cal lab and the paperwork came back from there stating U400 is bad. I don't know if a cal lab would have checked voltages, though. Will know more soon.

Thanks,
Barry - N4BUQ

----- Original Message -----

From: "very_fuzzy_logic@... [TekScopes]" <TekScopes@...>
To: TekScopes@...
Sent: Wednesday, March 30, 2016 3:21:35 PM
Subject: Re: [TekScopes] Re: 2465B U400 Availability?

Two points:

Barry's 2465B and mine have very similar issues with non-linearity on ch1 and
ch2 but ch3 and ch4 OK. At least on my scope the power rails are ok for
voltage and ripple. I also checked the power supplies where they have
common decoupling to U100 and U200 and so far have not found anything amiss.
There are threads here and elsewhere suggesting U400 as a possible cause
and it's price is consistent with it failing frequently! I haven't yet
checked U400 bias current or the voltages on the channel select inputs.

Secondly, Barry has several noisy analogue controls, DAC stability could be a
common cause. Do the y and t cursors move smoothly? If they don't then it
would be well worth checking the DAC output, there is setup procedure near
the beginning of the calibration section of the manual that puts the DAC
output on one of the DIP header pins and it responds to cursor movement -
should be a good test.

Meanwhile my replacement U400 has been stuck in transit for over a week en
route to the UK!

Roger

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