Date   

Re: WTF: TDS3000 Blank option modules.

Ken Eckert
 

Ebay, $10-20ish

On Saturday, February 8, 2020, Oz-in-DFW <lists@...> wrote:

Want to find - expected these might be a service part in stock somewhere.
Want to fill an empty hole.




Re: WTF: TDS3000 Blank option modules.

Oz-in-DFW
 

Want to find - expected these might be a service part in stock somewhere. Want to fill an empty hole.


Re: Dead 2430

Craig Cramb
 



I have checked the power lead - OK, plus the 5 amp quick blow fuse and that is OK
Check F961, located close to the J166/P166 along the angled area of power supply. I’ve had this fuse blow. Don’t remember all the details exactly of how the scope responded to this fuse being blown. If it is Ok, then there are a lot of caps on the PS that may need replacing. I replace all electrolytic except C105 and C305. To change the smaller caps remove PS and the S shape cover support mounted to the PS board to make the job easier. Hopefully you have a service manual.

Craig



On Feb 8, 2020, at 5:53 AM, koralrf via Groups.Io <koralrf=btinternet.com@groups.io> wrote:

Hi

I tend to run all my instruments periodically just to ensure that they are OK.

Today, I turned on my old TEK 2430 - and it was completely dead - no fan, nothing!

I have checked the power lead - OK, plus the 5 amp quick blow fuse and that is OK too..

So I presume that it has a fault in the Power Supply A16 board?

Any suggestions as to the best place to start looking please?

Thanks in advance

Tony


Re: Anyone needing parts from Tektronix 310A, 531A or 533A scopes?

Trevor
 

Brenda-
Consider saving the power transformers, as they have a tendency to develop a leakage path from the elevated potential CRT filament winding to whatever adjacent winding. Failed 310's are commonly saved by adding an external filament transformer, but that's a bit unsightly.
Trevor

On Saturday, February 8, 2020, 4:59:49 AM EST, momemeca <momemeca@...> wrote:

Hello Brenda,
Another request from the land of Oz :-)
I am restoring a number of older TEK scopes, including a 310A, and would dearly appreciate some parts if not a complete donor unit.
Perhaps the other gentleman (Morris I believe) could put me in touch with the fellow in AUS?

Cheers,

Rick
Melbourne AUS

On 8 Feb 2020, at 10:57, Brenda via Groups.Io <brendda75=yahoo.com@groups.io> wrote:

Hello everyone,

I am going to be parting out a Tektronix 310A, 531A and 533A scopes as I have lost too much money trying to get replacement CRTs for them, either damaged in shipping or getter has turned clear.  The parts that I am parting out would be the switches like the timing switch, HV power supplies from the 310A and 531A and special parts that would be considered hard to come by. I am just curious to see how many folks may be need in some parts before actually strip them. If there is enough interest, I will put the parts up on eBay.

Brenda



Dead 2430

koralrf@...
 

Hi

I tend to run all my instruments periodically just to ensure that they are OK.

Today, I turned on my old TEK 2430 - and it was completely dead - no fan, nothing!

I have checked the power lead - OK, plus the 5 amp quick blow fuse and that is OK too..

So I presume that it has a fault in the Power Supply A16 board?

Any suggestions as to the best place to start looking please?

Thanks in advance

Tony


Re: Anyone needing parts from Tektronix 310A, 531A or 533A scopes?

momemeca
 

Hello Brenda,
Another request from the land of Oz :-)
I am restoring a number of older TEK scopes, including a 310A, and would dearly appreciate some parts if not a complete donor unit.
Perhaps the other gentleman (Morris I believe) could put me in touch with the fellow in AUS?

Cheers,

Rick
Melbourne AUS

On 8 Feb 2020, at 10:57, Brenda via Groups.Io <brendda75=yahoo.com@groups.io> wrote:

Hello everyone,

I am going to be parting out a Tektronix 310A, 531A and 533A scopes as I have lost too much money trying to get replacement CRTs for them, either damaged in shipping or getter has turned clear. The parts that I am parting out would be the switches like the timing switch, HV power supplies from the 310A and 531A and special parts that would be considered hard to come by. I am just curious to see how many folks may be need in some parts before actually strip them. If there is enough interest, I will put the parts up on eBay.

Brenda



Re: Anyone needing parts from Tektronix 310A, 531A or 533A scopes?

Morris Odell
 

Hi Brenda,

A frend of mine down here in Australia is looking for a fan motor from a 531A or 533A. Would you be prepared to ship one down here?

Thanks,

Morris


Anyone needing parts from Tektronix 310A, 531A or 533A scopes?

Brenda
 

Hello everyone,

I am going to be parting out a Tektronix 310A, 531A and 533A scopes as I have lost too much money trying to get replacement CRTs for them, either damaged in shipping or getter has turned clear. The parts that I am parting out would be the switches like the timing switch, HV power supplies from the 310A and 531A and special parts that would be considered hard to come by. I am just curious to see how many folks may be need in some parts before actually strip them. If there is enough interest, I will put the parts up on eBay.

Brenda


Re: WTF: TDS3000 Blank option modules.

n4buq
 

I have a feeling that was meant to be WTD (WanTeD) but was mistyped.

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "satbeginner" <@satbeginner>
To: TekScopes@groups.io
Sent: Friday, February 7, 2020 1:00:33 PM
Subject: Re: [TekScopes] WTF: TDS3000 Blank option modules.

WTF or WTB?? :-)




Re: WTF: TDS3000 Blank option modules.

satbeginner
 

WTF or WTB?? :-)


Re: WTF: TDS3000 Blank option modules.

Ken Eckert
 


Re: WTF: TDS3000 Blank option modules.

David Kuhn
 

You want them for looks? Where those features not just added in the last
software release?

Dave

On Fri, Feb 7, 2020 at 11:08 AM Oz-in-DFW <lists@...> wrote:

I'm looking for a few of these to fill the gap in my TDS3014. Please
reply by DM




WTF: TDS3000 Blank option modules.

Oz-in-DFW
 

I'm looking for a few of these to fill the gap in my TDS3014. Please reply by DM


Re: Help with a Tek 7A26

k6whp
 

Gentlemen,

My thanks for your helpful responses. I shall employ these when I have the bench time this weekend and report back with specifics. I am very grateful!
--
William, k6whp
"A friend told me to cheer up, things could be worse.
So I cheered up and, sure enough, things got worse!"


Re: Help with a Tek 7A26

 

Hi William,
The bigger the problem the easier it is to find.
This is a biggie. There are only a few possibilities since both channels have the same problem, the cause must be common.
Power supplies are one possibility but power comes from the mainframe and if that was bad you would see it in lots of other places.

* You should start at the Display Switching and Output Schematic (#4).
* There is a small possibility that the power is not right. This entire section of the 7A26 appears to use only +15V and -15V so check these voltages first.
* Next set the CH 1 and Ch 2 inputs to 5mV/Div so there is no attenuation of the incoming signal.
* Place a small signal on the inputs or use the 40mVcalibrator signal.
* Look at the signal where it comes into schematic #4 in the upper left, from schematic 2.
* Schematic 4 shows the waveform you should get on each of the channels. You will have to look elsewhere to figure out what you should have input to the plugin to get that waveform. There has to be some overall gain from the input to the point you are measuring.
* Q820 and Q840 are in a common base configuration. The square wave going into their emitters is about 26mV pp on a DC level of 10.6V. * The signal coming out of their collectors is 200mV pp on a DC level of 0V AFTER it passes through R820 and R840.

Compare these readings to the good 7A26. That should narrow down the problem considerably.

The trigger circuit works exactly the same so it is possible you can swap transistors from the trigger circuit to the signal circuit to determine if a transistor is to blame.

Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of k6whp
Sent: Thursday, February 06, 2020 2:32 PM
To: TekScopes@groups.io
Subject: [TekScopes] Help with a Tek 7A26

Gentlemen (and ladies),

I have a sick 7A26 which I would seek advice on. The symptoms are as succinctly as follows:

(1) The vertical measurements are inaccurate; they are approximately 2/3rds of the correct value.
(2) The problem is common to both channels.
(3) The calibration of the unit does not provide sufficient range to correct the problem.

I have gone through the manual and have run the troubleshooting flow chart cursorily (he shamefacedly admits) and have scoured the schematics but would request help. I am NOT looking for a solution to be suggested (although, if something occurs..) but would appreciate a pointer or two on where to begin. I am going to borrow a friend's good 7A26 and "ohm the rails" as well as take comparative measurements on both. (I have a 7704A and can put the 7A26 in the left most slot to do the probing.) I would be grateful of some recommendations as to where to start snooping.

I am more interested in learning than ONLY fixing.

Thank you for your patience and suggestions.
--
William, k6whp
"A friend told me to cheer up, things could be worse.
So I cheered up and, sure enough, things got worse!"





--
Dennis Tillman W7PF
TekScopes Moderator


Re: Scam test equipment seller on Quoka.de and scam test equipment company Pancamega Indonesia

Mlynch001
 

There is no limit as to what these scammers will do to get your money.

--
Michael Lynch
Dardanelle, AR


Scam test equipment seller on Quoka.de and scam test equipment company Pancamega Indonesia

Ken Eckert
 

Two scams going, fellow on the R&S groups has found a seller on *Quoka.de,*I
had an email trail and purported invoice on a piece of Datron equipment.
Outlined below

A couple of weeks back a forum member was asking about a German website
called *Quoka.de* because he'd seen something he wanted to buy. I was bored
one day so I thought I've have a look and see if there's any R&S equipment
for sale. As it happened I saw an SMB100A on there for 900 euros which is
very cheap (about half the second-hand price). You never know what people's
circumstances and why they might be selling a particular item so I thought
I'd message the guy and see what he said.
After a day or two he got back to me saying that he still has the
instrument, and it was with him in Copenhagen, Denmark.
As* Quoka.de* seems to be a site that just puts buyers and sellers in touch
(similar to Craigslist in the US or Gumtree in the UK) I expressed my
concerns that neither of us was covered in case of an issue and i am not
comfortable with sending large amounts of money to people I've never met or
dealt with before. Also, randomly, I have friends and relatives in
Copenhagen so I offered to pick the item up or if he preferred we could do
the sale on Ebay. He replied saying it might be easier to use a shipping
company he knows in Denmark, but I could also pick the unit up if I wanted.
All seemed fairly legit until I started looking at the shipping website he
wanted me to use. I worked out this is an "Escrow scam" and only realised
something looked odd when the website ended in .tk instead of the Danish
.dk. Basically the shippig website is owned by the scammer and it pretends
to offer Escrow services whereby you send them money as an intermediary,
then they release the money to the seller after you've received the good
and are happy with them, except that in this case the scammer keeps the
money and the goods don't exist.
Luckily i was quite cautious and worked out what the guy was up to - I
called his bluff and said I'd come and pick the equipment up. After that he
disappeared. Some more details:

1. The guys name is Mr Rolf Bjarne Pedersen, email address
bjarnepedersenrolf@...
2. The scam shipping website http://www.dsvtransport.tk/ and the real
Danish shipping company https://dsvtransport.dk/ (the fake website has
cloned all the addresses of the real website, but it looks totally
different).

So, it turns out there are people out there who are setting up scams
selling quite esoteric high value R&S equipment, not just the obvious
Iphones or Apple laptops.

*Beware another scam site Pancamega, http://www.pancamega.com/
<http://www.pancamega.com/> *

Google Pancamega review, a couple of people were taken. Had a long email
trail about a piece of Datron equipment. Supposed to wire the money to a
bank in Jakarta, "sales manager Clara Indri"

Their address on their invoice is :
*Jl. Mohammad Kahfi 2, No 33, Cipedak,*

*Jagakarsa, South Jakarta,12630 Indonesia*

*If you Google that address you get a residential address as per one of the
reviews*


Looking for the PM-102/PM-103 Personality Module Service Manual

 

Does anyone have the Tektronix PM102/PM103 Personality Module Manual for the
6800/6802 microprocessors that is NOT this one: "070-2914-00 First Printing
August 1980".

I have two of these PM 102/PM103 Personality Modules. One agrees with the
manual that I listed above. The other one is different in significant ways
so Tek must have either
1) Issued a later revision of the manual, or
2) Included, at the very least, a significant Manual Change Notice in the
back of the same manual I listed above.

It appears from the serial numbers that my earlier PM102/PM103, Serial
#B010236, agrees with the August 1980 manual and it has a few jumpers on it.

The later PM102/PM103, Serial #, B010457, has no jumpers on it and the PC
Board is very different.

The early serial number board in question is labeled Y-6606-01 and the later
serial number board is Y-6606-02.
The official part number for the early SN board is 670-6118 and it is
670-6618-00 for the later SN. It is odd that the part number for the PC
Board didn't change except by adding the -00 suffix

Thanks in advance
Dennis Tillman W7pF


Re: Help with a Tek 7A26

Harvey White
 

Just some things I'd think about.  If the gain is the same for both channels, then either both channels have the same problem, or the problem is after where the switching happens (or may be something in the switching).

I'd put a standard signal into one channel, go for one channel only.  I'd look for the signal that Tektronix shows as a reference input.  Tek ought to show you the voltage readings (DC and AC) for a particular input value.

As an example, say that at a particular point you're supposed to see 10 volts p-p with the gain controls setup a particular way and with a specific input.  If you see 6.6 volts p/p, then I'd suspect the gain of the stage immediately before.  If there's an overall gain, I'd look at those parts specifically after you see if you can narrow down where the gain goes wonky.

I'd also look to see if the positioning controls have the proper range, although you can get much the same result with DC inputs or AC inputs.

In this case, I'd take one channel, follow it through from the beginning to the switching and then to the end.  While I suspect that the gain is bad somewhere after the switching, I'd still run a test to see if it's where it's ok.  You can run a divide by test, where you pick halfway through the chain (approximately) and then check the gain.  If it's ok, then after that point, if not, then before.  Continue to divide by  2 until you get to one, then play one stage at a time.

Harvey

On 2/6/2020 5:32 PM, k6whp wrote:
Gentlemen (and ladies),

I have a sick 7A26 which I would seek advice on. The symptoms are as succinctly as follows:

(1) The vertical measurements are inaccurate; they are approximately 2/3rds of the correct value.
(2) The problem is common to both channels.
(3) The calibration of the unit does not provide sufficient range to correct the problem.

I have gone through the manual and have run the troubleshooting flow chart cursorily (he shamefacedly admits) and have scoured the schematics but would request help. I am NOT looking for a solution to be suggested (although, if something occurs..) but would appreciate a pointer or two on where to begin. I am going to borrow a friend's good 7A26 and "ohm the rails" as well as take comparative measurements on both. (I have a 7704A and can put the 7A26 in the left most slot to do the probing.) I would be grateful of some recommendations as to where to start snooping.

I am more interested in learning than ONLY fixing.

Thank you for your patience and suggestions.


Help with a Tek 7A26

k6whp
 

Gentlemen (and ladies),

I have a sick 7A26 which I would seek advice on. The symptoms are as succinctly as follows:

(1) The vertical measurements are inaccurate; they are approximately 2/3rds of the correct value.
(2) The problem is common to both channels.
(3) The calibration of the unit does not provide sufficient range to correct the problem.

I have gone through the manual and have run the troubleshooting flow chart cursorily (he shamefacedly admits) and have scoured the schematics but would request help. I am NOT looking for a solution to be suggested (although, if something occurs..) but would appreciate a pointer or two on where to begin. I am going to borrow a friend's good 7A26 and "ohm the rails" as well as take comparative measurements on both. (I have a 7704A and can put the 7A26 in the left most slot to do the probing.) I would be grateful of some recommendations as to where to start snooping.

I am more interested in learning than ONLY fixing.

Thank you for your patience and suggestions.
--
William, k6whp
"A friend told me to cheer up, things could be worse.
So I cheered up and, sure enough, things got worse!"