Date   

Re: Mystery TM 504 screws.

Dave Seiter
 

I refurbed a pile of TM503 through TM506 a while back, and don't recall any plastic screws.  Seems to me the only place you'd need plastic on one of them would be to electrically isolate something, but even the power xstrs used steel hardware.
-Dave

On Wednesday, August 5, 2020, 05:53:08 AM PDT, Colin Herbert via groups.io <colingherbert=blueyonder.co.uk@groups.io> wrote:

Can anyone shed some light on this mystery? I was carrying out some repairs to my TM 504 mainframe, I noticed that there was a particular screw missing. I further noticed that an eBay seller (from who I had purchased before and was sure of their honesty) was selling these screws. On checking in my TM 504 Service Manual (ID# 070-1716-00) I ascertained that the description of the screws in the manual and on the seller's listing were substantially identical. The eBay listing was:

211-0040-00 TM 504 Plastic Screws 4-40 x .25"

The Manual has:

211-0040-00 SCREW, MACHINE: 4-40 x .25", BDCH PLSTC

The manual also shows in Fig. 2 Exploded that these screws are attaching a frame section and that nine are required.

This is where the mystery starts. The screws actually in place on my TM 504 are steel, countersunk head and of a much greater diameter than the plastic ones (which is what you might expect). Does anyone have any idea of what these plastic screws are for and how did such an anomaly happen in the TM 504 Service Manual?
TIA, Colin.


Re: Mystery TM 504 screws.

Colin Herbert
 

Yeah, I checked in my manual and found that they were item 39.
Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of teamlarryohio
Sent: 05 August 2020 18:27
To: TekScopes@groups.io
Subject: Re: [TekScopes] Mystery TM 504 screws.

You were looking at item 9. The others are item 39...no clue what uses the plastic ones.
-ls-


Re: AWG2021 Sample Waveform Library

Martin Hodge
 

Since there were no objections, I've gone ahead and uploaded them to the files section.
https://groups.io/g/TekScopes/files/AWG2011-2021_Sample_Waveform_Library-063-2169-00.zip


Re: Mystery TM 504 screws.

teamlarryohio
 

You were looking at item 9. The others are item 39...no clue what uses the plastic ones.
-ls-


Re: eBay / PayPal Changes and our alternatives

Tom Gardner
 

There will be alternatives for buyers, including using paypal.

What are the realistic alternatives to ebay for occasional sellers of test equipment?

Craigslist is moribund here; maybe that will change.

On 05/08/20 18:10, Michael W. Lynch via groups.io wrote:
On Wed, Aug 5, 2020 at 11:53 AM, Tom Gardner wrote:

Tom,

My replies interleaved

I hope I'm mistaken, but it looks worse for private sellers....
True! It is always worse for the sellers, even with today's rules.

- you might need to dispatch goods before receiving payment; I've had a couple
of non-payers recently
Not going to happen! No Pay, No Parts.

- you have to give ebay your checking account details; fraud opportunity
anyone?!
Again, they are not getting that financial information from me, either as a buyer or a seller. Thus PAYPAL.

- if a buyer claims a refund, that can be automatically sucked from your
checking account
- which might force you into an overdraft or prevent your normal standing
orders/direct debit payments from going through, which might.......
More BS and reason NOT to comply or participate.

E-bay is quickly becoming "Alibaba West"

I search quite often for unique or interesting test equipment. In the past year, I have noticed that almost everything has skyrocketed in cost and for shipping. Perhaps this is a sign that I have enough test gear and projects?

No PAYPAL and I am gone from E-Bay.


Re: Message to satbeginner and Saroj Pradhan re: Tektronix 2230

Dave Seiter
 

Yup!  They pop up all over user groups and youtube comments.  The "safety nazis", the folks who demand you use a crescent wrench correctly (why can't I turn it in the wrong direction or use it as a hammer- it's my wrench!?), the people who think there is only one correct way to (solve a problem/use a machine/make BBQ/think/behave), and, of course, the lawyer-driven "don't try this at home" garbage.
How does anyone truly learn anything without getting ones' hands dirty (and getting zapped by the HV anode you forgot to discharge)?
-Dave

On Wednesday, August 5, 2020, 09:49:41 AM PDT, Chuck Harris <cfharris@erols.com> wrote:
The world today has become a large cesspool of ninnies feeding
off of each others insecurities.  That wouldn't be so bad,
but they are all know-it-all ninnies, that know what is best
for each and everyone of us, and mandate all of it.

To achieve anything worth achieving, you have to take a chance.


Re: eBay / PayPal Changes and our alternatives

Michael W. Lynch
 

On Wed, Aug 5, 2020 at 11:53 AM, Tom Gardner wrote:

Tom,

My replies interleaved

I hope I'm mistaken, but it looks worse for private sellers....
True! It is always worse for the sellers, even with today's rules.

- you might need to dispatch goods before receiving payment; I've had a couple
of non-payers recently
Not going to happen! No Pay, No Parts.

- you have to give ebay your checking account details; fraud opportunity
anyone?!
Again, they are not getting that financial information from me, either as a buyer or a seller. Thus PAYPAL.

- if a buyer claims a refund, that can be automatically sucked from your
checking account
- which might force you into an overdraft or prevent your normal standing
orders/direct debit payments from going through, which might.......
More BS and reason NOT to comply or participate.

E-bay is quickly becoming "Alibaba West"

I search quite often for unique or interesting test equipment. In the past year, I have noticed that almost everything has skyrocketed in cost and for shipping. Perhaps this is a sign that I have enough test gear and projects?

No PAYPAL and I am gone from E-Bay.


--
Michael Lynch
Dardanelle, AR


Re: 7834 Missing Trace

sdferg7@...
 

I checked the +130 and -50V on the A20 horizontal amplifier, the -50, +5, -15, and +15 on the A19 vertical amplifier, and the +15, +5, and -15 on the A13 readout board going to the powered probe connectors.

Shane


Re: eBay / PayPal Changes and our alternatives

Vince Vielhaber
 

When I get converted I plan on opening a checking account specifically for that. Ebay said there's no opt-out after you're in. BS, I can close that account!

Vince - K8ZW.

On 08/05/2020 12:53 PM, Tom Gardner wrote:
I hope I'm mistaken, but it looks worse for private sellers....
- you might need to dispatch goods before receiving payment; I've had a
couple of non-payers recently
- you have to give ebay your checking account details; fraud
opportunity anyone?!
- if a buyer claims a refund, that can be automatically sucked from
your checking account
- which might force you into an overdraft or prevent your normal
standing orders/direct debit payments from going through, which
might.......


On 05/08/20 17:21, Michael A. Terrell wrote:
I may have to close my Ebay account if they stop accepting Paypal. I
average several hundred purchases, per year.

On Wed, Aug 5, 2020, 9:59 AM Michael W. Lynch via groups.io <mlynch003=
yahoo.com@groups.io> wrote:

On Wed, Aug 5, 2020 at 03:22 AM, Jay Walling wrote:

I don't think that's true. You can still buy using a credit card.
That is the whole point of using PayPal, not giving out my Card or
Financial information to everyone, not allowing card information to be
stored on E-Bay and multiple other servers or transmitting that card
information every time I make a purchase. E-Bay will do what they
need to
do and I will do the same.

--
Michael Lynch
Dardanelle, AR





Re: eBay / PayPal Changes and our alternatives

Shirley Dulcey KE1L
 

eBay will be accepting PayPal for payment from buyers through at least
2023. If they stop taking it after that, a workaround will be to get a
PayPal debit card. What they are no longer doing is letting SELLERS receive
money via PayPal.

On Wed, Aug 5, 2020 at 12:21 PM Michael A. Terrell <
terrell.michael.a@gmail.com> wrote:

I may have to close my Ebay account if they stop accepting Paypal. I
average several hundred purchases, per year.

On Wed, Aug 5, 2020, 9:59 AM Michael W. Lynch via groups.io <mlynch003=
yahoo.com@groups.io> wrote:

On Wed, Aug 5, 2020 at 03:22 AM, Jay Walling wrote:


I don't think that's true. You can still buy using a credit card.
That is the whole point of using PayPal, not giving out my Card or
Financial information to everyone, not allowing card information to be
stored on E-Bay and multiple other servers or transmitting that card
information every time I make a purchase. E-Bay will do what they need
to
do and I will do the same.

--
Michael Lynch
Dardanelle, AR






Re: eBay / PayPal Changes and our alternatives

Tom Gardner
 

I hope I'm mistaken, but it looks worse for private sellers....
 - you might need to dispatch goods before receiving payment; I've had a couple of non-payers recently
 - you have to give ebay your checking account details; fraud opportunity anyone?!
 - if a buyer claims a refund, that can be automatically sucked from your checking account
 - which might force you into an overdraft or prevent your normal standing orders/direct debit payments from going through, which might.......

On 05/08/20 17:21, Michael A. Terrell wrote:
I may have to close my Ebay account if they stop accepting Paypal. I
average several hundred purchases, per year.

On Wed, Aug 5, 2020, 9:59 AM Michael W. Lynch via groups.io <mlynch003=
yahoo.com@groups.io> wrote:

On Wed, Aug 5, 2020 at 03:22 AM, Jay Walling wrote:

I don't think that's true. You can still buy using a credit card.
That is the whole point of using PayPal, not giving out my Card or
Financial information to everyone, not allowing card information to be
stored on E-Bay and multiple other servers or transmitting that card
information every time I make a purchase. E-Bay will do what they need to
do and I will do the same.

--
Michael Lynch
Dardanelle, AR




Re: Message to satbeginner and Saroj Pradhan re: Tektronix 2230

Chuck Harris
 

Straw man much, Roy?

You would probably be mortified that my father, also an
EE, but of the power and light variety, gave me a 513D
oscilloscope for Xmas; when I was a tender young man of 13.

At 13, my sole and only electronics training was building a
xtal radio, a motor, a few Heathkits, shocking the dickens
out of myself with a model T Ford spark coil... repeatedly,
and reading many years worth of Radio Amateur's Handbooks.
Oh, that and taking apart things I found in the town's dump.

Dad had taught me to use a soldering gun, and solder back
when I was 4 or 5... Or, rather, I watched him do it, and
he did nothing to discourage me when I borrowed his gun and
solder and made things with it. He had what for him would
have been a lifetime supply of Ersin Multi-core solder, that
I used up long before I left junior high school.

When the 513D needed some service, he helped me to remove
its cabinet, handed me the manual to study, and advised me
to always wear shoes, and to keep one hand in my pocket
when I probed around in its chassis. I'm a romantic, he
probably said more, but I don't remember it that way.
Dad was way more comfortable with engines, motors, transformers
and very large generators.

My dad understood electricity, but electronics, not so much.

It took quite a while, but I fixed that scope, with plenty
of encouragement, but no real help, and I didn't kill, or
even shock myself.

The world today has become a large cesspool of ninnies feeding
off of each others insecurities. That wouldn't be so bad,
but they are all know-it-all ninnies, that know what is best
for each and everyone of us, and mandate all of it.

To achieve anything worth achieving, you have to take a chance.

Even if you work naively, and carelessly, the likelihood of
killing yourself with these scopes is small enough as to be
insignificant. Sparks and electric shocks have a tendency to
focus your attention.

You should read of the extreme effort Edison's surrogates had
to go to to make a working electric chair... all in an attempt
damage Westinghouse, and AC power transmission.

-Chuck Harris



Roy Thistle wrote:

On Tue, Aug 4, 2020 at 08:13 PM, Chuck Harris wrote:


Because of the experience level
and also... DaveC wrote:

I enjoy reading the back-and-forth between the owner and any number of helpers on a repair project
Newbie: I have a butter knife and a 10.00 meter (says DMM on it, what's that?) Anyway, I'm trying to fix my 2465 oscilloscope... it doesn't work. Can someone help me.
Gumpy Old Man: Hi Newbie. Check the voltages on the power supply. Use your digital multimeter, and an isolation transformer.
Grumpy Old Man: Hi Newbie.. did you check the power supply voltages?
... some time passing...
Grumpy Old Man: Haven't heard from you for some time. Is everything okay?
...crickets...




Re: 7834 Missing Trace

Roger Evans
 

Can you just confirm which low voltage DC supplies you checked when you said they were all OK?

Roger


Re: 7834 Missing Trace

Roger Evans
 

It looks like the 'main' Zaxis signal, which contains both the brightness level and the unblanking pulse, is not getting through to the Zaxis amplifier. The inputs to the Zaxis amplifier from the readout system and from the 'main' signal source are completely symmetric so it looks as though it should be safe to swap the plugs on J2208 and J2203 on the Zaxis board, provided the leads are long enough.

I don't think its particularly safe to leave R2135 where it is, I would restore it to something approximating its original position. Do that first and then reinstate the readout display.

If you then swap the J2203 and J2208 leads and nothing changes it suggests there is no signal on the 'main' Z axis lead where it arrives at the Zaxis board. This could be a plug/cable fault so see if you can trace the cable originally on J2208 from the Zaxis board back to the A6 Logic board at J4408, probably via the main interface board. Check end to end continuity with your multimeter. If the cable continuity looks good then you may well have a faulty U4494. Again, if it is socketed, remove it, clean the pins and reinsert.

If you swap the J2203 / J2208 leads and the main signals work but not the readout then you probably have a fault around Q2216. Is it socketed?

If you or anyone following this thread think this suggestion is too risky (7834s and 7934s are quite rare) then please ignore the suggestion.

Regards,

Roger


Re: eBay / PayPal Changes and our alternatives

Michael A. Terrell
 

I may have to close my Ebay account if they stop accepting Paypal. I
average several hundred purchases, per year.

On Wed, Aug 5, 2020, 9:59 AM Michael W. Lynch via groups.io <mlynch003=
yahoo.com@groups.io> wrote:

On Wed, Aug 5, 2020 at 03:22 AM, Jay Walling wrote:


I don't think that's true. You can still buy using a credit card.
That is the whole point of using PayPal, not giving out my Card or
Financial information to everyone, not allowing card information to be
stored on E-Bay and multiple other servers or transmitting that card
information every time I make a purchase. E-Bay will do what they need to
do and I will do the same.

--
Michael Lynch
Dardanelle, AR




Re: 155-0035-00

 

It was an admin error, they will post them

David.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Colin Herbert via groups.io
Sent: 05 August 2020 12:39
To: TekScopes@groups.io
Subject: Re: [TekScopes] 155-0035-00

FYI, although there are no 155-0035 ICs there, someone on eBay is selling Tek 155 ICs. You just have to travel to Camberley, UK to pick them up:

https://www.ebay.co.uk/itm/Tektronix-Custom-IC-155-XXXX-XX-New-Old-Stock/333676532016?var=542767266724&;hash=item4db0abd130:g:HjYAAOSwL1VfKoiU

I might point out that Camberley isn't far from London and that I have bought stuff from this seller happily. He usually posts stuff, so why he is only offering pick up on things that would go in a static-sensitive bag in a Jiffy-Bag I don't understand.

Colin.


Re: 7834 Missing Trace

sdferg7@...
 

I think the faint line between the peaks at the top is the flyback line (the trace intensity looks much higher in the image than it is in real life): https://imgur.com/a/KKS7vMp

I've discovered neither intensity control works, when either are moved to the maximum position their respective trace goes out of focus. No other change is visible when moving the knobs.

After some messing around, it does seem like the storage settings are working correctly. The only hiccup is the bright dot you can see at the lower left of the image. When I enter the save mode the image remains, but the dot creates a splotch that slowly radiates out. My work-around currently is to enter the save mode, then move the horizontal control all the way to the left so that the dot goes off-screen.

The scope also seems to have a long warm up time to me. The previous image has the calibration signal set to 4V after running perhaps 10 minutes. My other confusion, and I may just be the ultimate idiot here, is that the calibration signal seems to output half of what it is labeled to output. I confirmed this with an RMS multimeter. So the 4V setting outputs ~1.97V or so. It's a square wave so the RMS should be the same as the peak to peak voltage. The other decades behave similarly. Anyway, After running for maybe 40 minutes the scope begins to properly display 2V on one channel, then a bit later on the other. So I'm not sure if these just have a long warm up time or if something isn't right.

Shane


Re: TAS455 TAS465 SMPS 119-5024-00 (Astec AA18020) repair

 

On Wed, Aug 5, 2020 at 03:54 PM, Jon wrote:


are there any symbols or a manufacturer's logo, anything on the other side or
even just the colour
No logo or anything on the reverse side and they are red. Not much to take a picture of.
Both were originally covered by shrink tubing.

/Håkan


Re: FG 502 Adjustment and Possible New Issue

Roger Evans
 

Just had a quick read of the Theory of Operation and Calibrations setions of the manual.

R250 is to set the DC level of the triangle wave before it goes into the triangle to sine converter. It needs to be set with a distortion meter, so don't touch it for now.

The DC level at the output is set with R485 (DC Bal).

Roger


Re: 155-0035-00

Siggi
 

On Tue, Aug 4, 2020 at 8:09 PM Dennis Tillman W7pF <dennis@ridesoft.com>
wrote:

Hi pitti_pu,
I am puzzled by this part number. The 7L5 service manual confirms it is
correct but there are no 155-0035 ICs. In fact there are no ICs starting
with 155 in any of the Tek Semiconductor or IC parts catalogs I have.
On page 5-11 of this doc http://w140.com/tek_made_sm.pdf, there's a
description of this one.

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