Date   

Re: Tektronix 2215 problem

Greg Bowne <gbowne1@...>
 

As far as I know of, the best place I have been able to find.. around here anyhow.. is http://www.tekscopeservice.com/
 
Tek Scope Service
Dan Shores
3831 SE 92nd Ave.
Portland, OR 97266
 
Greg


From: Daniel
To: TekScopes@...
Sent: Sun, July 3, 2011 4:53:44 PM
Subject: [TekScopes] Tektronix 2215 problem

 

I recently bought this 'scope from ebay and I got a good deal on it because it doesn't work. there seems to be some problem with the PSU it just makes a high pitched whine and I get no trace on the screen. I posted a video on youtube so you can see for yourselves what it's doing. what I want to know is what I should check for, where I can get replacement parts, or, where I can send this to get it fixed. I know intermediate electronics but i'm not great at troubleshooting. I'm more into repairing tube radios. that's kind of the reason I bough the scope. anyway hope someone can help me!

http://www.youtube.com/watch?v=GFPTLrw9enk


Tektronix 2215 problem

Daniel
 

I recently bought this 'scope from ebay and I got a good deal on it because it doesn't work. there seems to be some problem with the PSU it just makes a high pitched whine and I get no trace on the screen. I posted a video on youtube so you can see for yourselves what it's doing. what I want to know is what I should check for, where I can get replacement parts, or, where I can send this to get it fixed. I know intermediate electronics but i'm not great at troubleshooting. I'm more into repairing tube radios. that's kind of the reason I bough the scope. anyway hope someone can help me!

http://www.youtube.com/watch?v=GFPTLrw9enk


Re: Best electrolytics for recapping (2235)?

Lowell
 

Not an answer but, the web site "badcaps.com" has a ton of people who seem to know an awful lot about recaping, cap types and manufactures. I've useed them extensively when deciding about a cap type to use.
NOTE: They're mostly about recapping motherboards and the high ripple requirements of the VR power supply. However, there's a lot of info about just general circuit recapping.
The general jist of it is that one should know what the specific circuit requires; high ripple capability is NOT always the correct answer (too low of a ESR).
Take a look, you may be amazed at all the knowledge and friendly advice available from them.
P.S. I'm only a user of the site.

Some years ago Panasonic had low impedance series that leaked about >a year or two in service. They dis-continued this series and every >company that used them had a product liability problem.

Since then, I have stopped using Panasonic capacitors in any >>designs.. Due to the easy availability of Panasonic parts at >>Digi-key, they have become common, but they are not always the >>ideal choice. This is a marketing strategy that has worked well for >>Panasonic.
My perfered has been United Chemi-Con, Nichicon or even CDE.
The specific type of 'lytic that should be used depends on the >>it's specific job in circuit. There is not real one 'lytic does >>all. Be aware of life, temperature, specified temperature and other >>ratings before installing any replacement 'lytic.

Bernice 
--- On Sat, 7/2/11, ab1jx <alancorey@...> wrote:

From: ab1jx <alancorey@...>
I've got some 11 khz ripple in the vertical section of my 2235 so I was thinking about recapping it. I saw Rubycon mentioned in another thread, I was thinking Panasonic EEU line or maybe Nichicon. Is there one all-around best choice or does it depend on where it is in the scope?



Alan


Re: ROM for 7854

dinosadamopoulos
 

Thank you for your advice, but I am waiting for my membership approval to the TekScopeArc2.
I found some ROM chips (MCM68764 and MCM68766) but I don¢t know which one is the most appropriate. So I am waiting about your solution. I hope to find a way to fix the problem. In the mean time I read all the links about similar problems of the 7854.
Thanks again Dinos.


Re: TEK 466 focus potentiometer

cam55orange
 

Doug,

Life it tough on these knobs. If the blue case stuck out over the front of the instrument about an inch we would not have this problem.

I have a couple of sources:

Jim Reese jreese@7010@...

Sphere Research http://www.sphere.bc.ca/

Good luck.

Bill

--- In TekScopes@..., Douglas Ho <dho695@...> wrote:


Hi bill,
I have a couple of 465 scopes need Knobs. Can you recommend the good source for me?
Thanks,
Douglas Ho

To: TekScopes@...
From: bwebb@...
Date: Sat, 2 Jul 2011 15:43:03 +0000
Subject: [TekScopes] TEK 466 focus potentiometer




























I recently purchased a very used Tektronix 466 scope. It had a few broken knobs. I have been able to purchase replacements. So far it works great. I have discovered one problem. The focus potentiometer is stuck. It will not budge with vise grips. Fortunately it is frozen in the 'focused' position. I am wondering if the wiper is welded itself in this postion. Is this a know problem? Is there a source for a replacement focus potentiometer?



Since the trace is in focus this is not a big problem, but it is annoying.



Thanks - bill


Re: No HV on tek 465

magaudiolab
 

Thank you so much Mendel!
I am still checking HV (hoping to find my good old HV probe ASAP. I had one in my lab but I have not used it for so long... God knows where is it now!).
I will use 2CL73 (easy to find) which seems a valid alternative, if it should work I will let to know.

Valerio

--- In TekScopes@..., Mendel Pearl <mypearl@...> wrote:

I can send you one for free, but I am in Holland. I think it will fit a
standard letter so cost should be no issue.

Let me know if you want one.

Mendel


Re: No HV on tek 465

magaudiolab
 

--- In TekScopes@..., "Hakan H" <hahi@...> wrote:



--- In TekScopes@..., "magaudiolab" <v.maglietta@>
How did you determine it was open ? This diode (152-0409-00) has forward
drop of about 9 V at 1 mA so it can not be checked with a normal DMM.
/Håkan
Hi Håkan,
I did not use DMM at all, but a D-R series circuit (R being 22k so current max should never exceed 3mA) powered by a variable power supply (up to 60V).
Diode never showed any measurable conduction at all. If any, current is below .01uA.
Far way from 9V @ 1mA as you stated.
If it is not opened, it is likely to be a leaky diode.


Re: TEK 466 focus potentiometer

Angela(Eastman) Ho
 

Hi bill,

I have a couple of 465 scopes need Knobs.  Can you recommend the good source for me?

Thanks,

Douglas Ho


To: TekScopes@...
From: bwebb@...
Date: Sat, 2 Jul 2011 15:43:03 +0000
Subject: [TekScopes] TEK 466 focus potentiometer

 
I recently purchased a very used Tektronix 466 scope. It had a few broken knobs. I have been able to purchase replacements. So far it works great. I have discovered one problem. The focus potentiometer is stuck. It will not budge with vise grips. Fortunately it is frozen in the 'focused' position. I am wondering if the wiper is welded itself in this postion. Is this a know problem? Is there a source for a replacement focus potentiometer?

Since the trace is in focus this is not a big problem, but it is annoying.

Thanks - bill



Re: Problem calibration TEK 495P

Bob Koller <testtech@...>
 

The first thing I would check is the input attenuator. If you input, say, 0dbm from your generator, what is the on screen amplitude display? Is it close to the top of the screen with the input atten knob at 0db? Next, reduce the sig gen output in 10db steps and verify the steps with the 495 input atten knob. One of the first things to suspect is a damaged input attenuator, and /or damaged mixer. Of course, many other things can cause this, but these are suseptable to external input overload.


--- On Sun, 7/3/11, hh wrote:

From: hh
Subject: [TekScopes] Problem calibration TEK 495P
To: TekScopes@...
Date: Sunday, July 3, 2011, 2:19 AM

 

Hello,

i've this problem on my Tek 495P.
When i start the calibration routine,with the internal generator 100Hhz -20 dB,the routine fails because the processor says taht there is any signal calibrator is present.
I've checked the output signal at 100Mhz -20 Db and is ok.

So i've connected to rf input an external RF generator at 100MHZ and the test start only when i give a signal @ 100Mhz 0(zero) dB.
Seem to be a loss of gain.
What can i verify in the instruments for repair this loss of gain?

Thanks for Any help.

MAX


Re: No HV on tek 465

J. L. Trantham
 

Oh.
 
Joe
 
 

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf Of Hakan H
Sent: Sunday, July 03, 2011 4:05 AM
To: TekScopes@...
Subject: [TekScopes] Re: No HV on tek 465

 



--- In TekScopes@..., "J. L. Trantham" wrote:
>
> When I have tested similar diodes (although lower voltage, about 5 KV) I had
> to use a power supply through a resistor to drive the diode forward to see
> the current flow since my DMM couldn't produce enough forward voltage to
> 'turn on' the diode. Which DMM are you using?
>
> Joe
>
> -------
576 curve tracer
/Håkan


Re: Tek P7001 Processor

g_kupka <ghm1@...>
 

I am looking for an extension board for the P7001

Gerhard

--- In TekScopes@..., d.seiter@... wrote:

I was on vacation until yesterday, but my P7001 is still mothballed.


Dave


Problem calibration TEK 495P

hh <ciulandro@...>
 

Hello,

i've this problem on my Tek 495P.
When i start the calibration routine,with the internal generator 100Hhz -20 dB,the routine fails because the processor says taht there is any signal calibrator is present.
I've checked the output signal at 100Mhz -20 Db and is ok.

So i've connected to rf input an external RF generator at 100MHZ and the test start only when i give a signal @ 100Mhz 0(zero) dB.
Seem to be a loss of gain.
What can i verify in the instruments for repair this loss of gain?

Thanks for Any help.

MAX


Re: No HV on tek 465

 

--- In TekScopes@..., "J. L. Trantham" <jltran@...> wrote:

When I have tested similar diodes (although lower voltage, about 5 KV) I had
to use a power supply through a resistor to drive the diode forward to see
the current flow since my DMM couldn't produce enough forward voltage to
'turn on' the diode. Which DMM are you using?

Joe

-------
576 curve tracer
/Håkan


Re: What is a Rockland 7530B Analyzer plugin for 7000 main frames?

d.seiter@...
 

As I recall, it is FFT, with a range of 0-250kHz.  Might be fun to play with if the price was right.

Dave



From: "haubmi1"
To: TekScopes@...
Sent: Saturday, July 2, 2011 5:35:09 PM
Subject: [TekScopes] What is a Rockland 7530B Analyzer plugin for 7000 main frames?

 

Hi,

What is a Rockland 7530B Analyzer plugin for 7000 main frames?
Is it an FFT analyzer and which is the frequency range?

Is it worth buying?
Is a service manual anywhere?

Thanks
Michael


Another scope topic - this time, Triggering Controls

w2aew
 

Here's a short video that describes the typical triggering controls on an analog
oscilloscope, and how to use them. Controls covered are the Source, Coupling,
Mode and Holdoff controls.

http://www.youtube.com/watch?v=OFGm-Pel4Hg

Enjoy!

73,
Alan W2AEW


Re: Transistor identification

d.seiter@...
 

Is it a solid diamond or an outline?  I think I have some similar, but they don't appear on my master list yet.

Dave



From: "Chris Moore"
To: TekScopes@...
Sent: Saturday, July 2, 2011 6:56:15 PM
Subject: Re: [TekScopes] Transistor identification

 

Hello again,
 
There is also a black diamond after the 3-71 if that is any clue as to who made it.
 
Chris

--- On Sat, 7/2/11, Chris Moore wrote:

From: Chris Moore
Subject: [TekScopes] Transistor identification
To: "TekScopes"
Date: Saturday, July 2, 2011, 11:48 PM

 
Hi all,
 
I've recently acquired a bag full of new old stock transistors, but I can't find any data on them. The one I'm holding right now has a 12H on it. Underneath the 12h is 3-71, which may be the date code. They're in a can package and have three legs so I'm guessing they are transistors, but like I said I'm guessing. Please help.
 
Thanks,
Chris
 
P.S. I also have some with 12M and some with 12N on them.


Re: Tek P7001 Processor

d.seiter@...
 

I was on vacation until yesterday, but my P7001 is still mothballed.

Dave



From: "Albert"
To: TekScopes@...
Sent: Saturday, June 25, 2011 8:39:39 AM
Subject: [TekScopes] Re: Tek P7001 Processor

 

Gerhard,
This thread is becoming a monologue... where are the other P7001 owners?
In your memory display there are no gaps horizontally, meaning that the Display Gen address counter works fine. The digital addresses are common to feed the X DAC and to retrieve Y-data from Memory (at ADD0-ADD8), with nothing in-between. So if one had an error, the other would have the same error and the produced screen position would still at the waveform (though not intended position).
More speculations:
It could be possible that the two signal levels (for 0 and 1) at ADD6 (A22) are distinct enough for U24 but not for the address bus receiver in Memory. I could be a fault of U00. Maybe also a bad solder joint to A22.
I will wait now for the result of the experiment I suggested earlier.
Albert

>
> Gerhard,
> Please forget this also!
> I have to think longer about this. It's not an error in the vertical value decoder but an error in the address where the vertical data is retrieved.
> Albert
>


Re: Transistor identification

Chris Moore <chris2phermoore@...>
 

Hello again,
 
There is also a black diamond after the 3-71 if that is any clue as to who made it.
 
Chris


--- On Sat, 7/2/11, Chris Moore wrote:

From: Chris Moore Subject: [TekScopes] Transistor identification
To: "TekScopes" <TekScopes@...>
Date: Saturday, July 2, 2011, 11:48 PM

 
Hi all,
 
I've recently acquired a bag full of new old stock transistors, but I can't find any data on them. The one I'm holding right now has a 12H on it. Underneath the 12h is 3-71, which may be the date code. They're in a can package and have three legs so I'm guessing they are transistors, but like I said I'm guessing. Please help.
 
Thanks,
Chris
 
P.S. I also have some with 12M and some with 12N on them.


Transistor identification

Chris Moore <chris2phermoore@...>
 

Hi all,
 
I've recently acquired a bag full of new old stock transistors, but I can't find any data on them. The one I'm holding right now has a 12H on it. Underneath the 12h is 3-71, which may be the date code. They're in a can package and have three legs so I'm guessing they are transistors, but like I said I'm guessing. Please help.
 
Thanks,
Chris
 
P.S. I also have some with 12M and some with 12N on them.


What is a Rockland 7530B Analyzer plugin for 7000 main frames?

haubmi1
 

Hi,

What is a Rockland 7530B Analyzer plugin for 7000 main frames?
Is it an FFT analyzer and which is the frequency range?

Is it worth buying?
Is a service manual anywhere?

Thanks
Michael

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