Date   

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_Tillman_W7pF>
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.


Re: 155-0035-00

 

"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.

Can someone point me to a list of Tek ICs that does have the 155-xxxx IC in it?

Dennis Tillman W7pF"

Dennis and all:
Check the "Tek_RPR_155_Tek_Made_ICs.pdf", pg. 7332 as shown on page or page 40 of 90 when opened with the PDF reader, which is on the TekWiki site. It shows the 155-0035-00 and also shows that it is in the 7L5 Spectrum Analyzer as well as other Plug ins including the 7L13, 7L14, 7L18 and sampling plugins.
I opened a "hanger queen" 7L5 that I have and indeed there is a U1400 and it is marked 155-0035-00. The U730 is harder to get access to but I will assume that it is also that P/N.
Sorry if I have misunderstood the original post but Dennis indicated that he couldn't find that Tek custom IC.
If "@Tek_HP" is in the USA I can send him one from my parts unit if he still needs it.
Bill


Re: DC503 Not Working

Harvey White
 

That's a start place.  Knowing how it works, you can start at either end and work towards the other.

Harvey

On 8/5/2020 5:07 AM, Stephen wrote:
On Tue, Aug 4, 2020 at 02:03 PM, Harvey White wrote:

Vocabulary thingie......

A pulse, likely sequential, is (at least at on time) called a strobe.

Take a display with a common anode for all the segments.  It needs to be
connected to VCC (power) to light.  However, there's a limit where the
display continuous power per segment is exceeded. This is not a good
design.  However, if you pulse the LED (segment) with more current than
the continuous rating, but for less time, then the display survives.
Due to a quirk with human vision, it appears brighter.  So what you do
is connect the source of each digit to a signal (strobe) which in
sequence selects each digit.

The segments drivers themselves are selected so that the current through
each segment (assuming common anode with digit strobe to +vcc, and
segment driver (through resistor) to ground) is the nominal peak current
that they want.

So if all displays were driven in parallel, there'd be one driver chip
per display, no pullup transistor to VCC, and  a lot of chips.  If you
multiplex the displays (please look this up), then you have a sequential
pullup to VCC (called a strobe), a pulldown to ground (called the
segment driver, which determines which segments on which digit are on
when....) and a current which is more than needed for a single digit
(perhaps # digits times current per segment, because you don't know if a
segment is on or off, so you do it per segment).

So:

a scanned display turns on each digit sequentially, with more current
per segment than permitted (steady state but less than pulsed) and with
less chips, but more complex than a few digits. However, as the digit
count goes up, the circuit is simpler. Microprocessors love this kind of
thing.

Harvey
Ok, so you suggest I sweep each digit for a signal at its input? At the ribbon cable connections then...



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

Roy Thistle
 

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: eBay / PayPal Changes and our alternatives

Michael W. Lynch
 

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

Jon
 

Håkan,

Thank you that's really helpful :) . I haven't been able to find a matching VDR / MOV , are there any symbols or a manufacturer's logo, anything on the other side or even just the colour of them which might help me narrow the search down ? A photo if possible would be great.

Many thanks,

Jon


Re: Mystery TM 504 screws.

Colin Herbert
 

A typo on the diagram could just be the answer. The problem is that while I can credit that 212-0040-00 is the correct screw for where "9" is labelled on the diagram, there are only nine called out in the list, when twice this number is actually required. Perhaps whoever compiled that part of the manual had a "liquid lunch" on a Friday - it's a typo upon a typo.

It still leaves the puzzle of what the little plastic screws are meant for....
Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of teamlarryohio
Sent: 05 August 2020 14:35
To: TekScopes@groups.io
Subject: Re: [TekScopes] Mystery TM 504 screws.

My manual (same) shows 212-0040-00 are used in many places. I'd bet on a typo.
-ls-


OT Thank You

Stephen
 

I am quite new to this higher level of electronics (for me), and also new here.
My knowledge is therefore very limited compared to that of most people here.

Thus, following some posts I’ve been seeing, I just wanted to thank all the nice people that have, and continue to help me.
I have learned more here, and continue to learn, every day. Even though I don’t always yet understand everything.

So again THANK YOU for being there, and for kindly share your knowledge, time and experience with noobs/beginners like me.

I hope that someday I’ll be able to help others the way you are helping me.

Stephen


Re: Mystery TM 504 screws.

teamlarryohio
 

My manual (same) shows 212-0040-00 are used in many places. I'd bet on a typo.
-ls-


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

ArtekManuals <manuals@...>
 

I highly recommend a nap and a couple of fig newtons

Curmudgeon in Training
Dave
manuals@...

On 8/5/2020 9:21 AM, Roy Thistle wrote:
On Tue, Aug 4, 2020 at 08:13 PM, Chuck Harris wrote:

our group has a few grumpy old men
... well... some of might be grumpy; but, not old men.... and some of us may be "grumpy old men"... and some of might be other things too!

In my opinion... and this is exactly, and only, my opinion...and exactly and only what I am claiming (so please don't try to insert clandestine personal interpretations and attribute them to me)...
(1) Plainly, the whole point of having a Manager/Moderator is to arbitrate.
(2) The logical consequence of (1)

Groups.io has information pertaining to how (in their expert view) a Groups.io group ought to be managed/moderated.
Groups.io Managers Forum is where the ought is worked out in the wash.

--
Dave
Manuals@...
www.ArtekManuals.com
--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus


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

Roy Thistle
 

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


our group has a few grumpy old men
... well... some of might be grumpy; but, not old men.... and some of us may be "grumpy old men"... and some of might be other things too!

In my opinion... and this is exactly, and only, my opinion...and exactly and only what I am claiming (so please don't try to insert clandestine personal interpretations and attribute them to me)...
(1) Plainly, the whole point of having a Manager/Moderator is to arbitrate.
(2) The logical consequence of (1)

Groups.io has information pertaining to how (in their expert view) a Groups.io group ought to be managed/moderated.
Groups.io Managers Forum is where the ought is worked out in the wash.


Mystery TM 504 screws.

Colin Herbert
 

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: eBay / PayPal Changes and our alternatives

Precaud
 

They require bank data reom sellers, not buyers.


Re: 155-0035-00

Colin Herbert
 

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.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Dave Casey
Sent: 05 August 2020 01:50
To: TekScopes@groups.io
Subject: Re: [TekScopes] 155-0035-00

Page 3-6 of the 1982 Semiconductor common design parts catalog lists the
Tek made (155) ICs.

Dave Casey



On Tue, Aug 4, 2020 at 7:09 PM Dennis Tillman W7pF <@Dennis_Tillman_W7pF>
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.

Can someone point me to a list of Tek ICs that does have the 155-xxxx IC
in it?

Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
@Tek_HP
Sent: Tuesday, August 04, 2020 11:27 AM
To: TekScopes@groups.io
Subject: [TekScopes] 155-0035-00

The spectrum analyzer 7L5 contains two 155-0035-00 quad op amps. One of
the four was faulty. No direct replacement was available. Therefore, I
disconnected the three affected pins, then piggy-backed a LM324 in place
with ±15V lines attached to the 115-0035 and added three wires for the
socket. The remaining three op amps in the LM324 are not used.
Works nicely. The gain/bandwidth product of the LM324 is much smaller, but
that does not affect the performance.





--
Dennis Tillman W7pF
TekScopes Moderator




Re: eBay / PayPal Changes and our alternatives

Heinz Breuer
 

Well I was already forced to pay via Adyen by dealing with another company. No problem at all, I could chose PayPal as method of payment. They also offered credit card payment. No bank data required.

regards
Heinz DH2FA, KM5VT

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