Date   

Re: 184 Schematics

 

On Sat, Aug 22, 2020 at 10:24 PM, david wrote:


I have taken all the schematics for a 184 that were in two pieces and
assembled each schematic into a single document. All PDF files. If anyone is
interested I can put the in a ZIP file and Email them to you. Much easier to
understand circuits when looking at complete schematic.
Why not put them on TekWiki and make them available to everybody?
If you prefer, send them to me and I'll put them there.

Raymond


Re: 184 Schematics

Peter Brown
 

I’m interested

Peter

On Sat, Aug 22, 2020 at 2:24 PM david via groups.io <davide_us=
yahoo.com@groups.io> wrote:

I have taken all the schematics for a 184 that were in two pieces and
assembled each schematic into a single document. All PDF files. If anyone
is interested I can put the in a ZIP file and Email them to you. Much
easier to understand circuits when looking at complete schematic.

David








Re: 184 Schematics

Stephen
 

On Sat, Aug 22, 2020 at 09:24 AM, david wrote:


I have taken all the schematics for a 184 that were in two pieces and
assembled each schematic into a single document. All PDF files. If anyone is
interested I can put the in a ZIP file and Email them to you. Much easier to
understand circuits when looking at complete schematic.
David
I’m interested.


184 Schematics

david
 

I have taken all the schematics for a 184 that were in two pieces and assembled each schematic into a single document. All PDF files. If anyone is interested I can put the in a ZIP file and Email them to you. Much easier to understand circuits when looking at complete schematic.
David


Re: Tek 465 Sweep Start Calibration

david
 

Yeah, I checked and R1112 is 49.9 ohm, R 1111 is 562 ohm, ordered 196 ohm 1% 50ppm resistor, I can replace R1113 without removing A7 board.I will let you know if it works. Thanks for help.
David


Re: PS503A Mod FF Photos?

 

On Sat, Aug 22, 2020 at 06:44 PM, Colin Herbert wrote:


Wouldn't another power-supply be a possibility? Perhaps another PS503A or
something simpler, even. What if you want four power-sources - basically then
you do need another power-supply.
Sure, definitely, I wouldn't want to modify a PS503 *today*. In the past, I may have but reason 2 wouldn't have applied...
In the past, I would have liked to use fewer slots in my TM50x.

Raymond


Re: PS503A Mod FF Photos?

Stephen
 

This is exactly what I was gonna say.
Use another power supply... 🤷‍♂️


Re: PS503A Mod FF Photos?

Colin Herbert
 

Wouldn't another power-supply be a possibility? Perhaps another PS503A or something simpler, even. What if you want four power-sources - basically then you do need another power-supply.
Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Raymond Domp Frank
Sent: 22 August 2020 17:41
To: TekScopes@groups.io
Subject: Re: [TekScopes] PS503A Mod FF Photos?

On Sat, Aug 22, 2020 at 04:17 PM, Stephen wrote:


May I ask why one would need to modify a PS503A?
Can’t you adjust and fine tune the 20V supply? That’s what i do on mine...
🤷‍♂️
A few reasons come to mind:
1. I may want to use the +/- 20V lines and supply my ECL logic as well (-5.2V nominal). It *is* a triple-voltage supply...
2. I may be using the +/- 20V lines, at the same time wanting to supply my Raspberry Pi 3B+, which doesn't like being fed less than 5.1V (or so).
3. I may want to supply my +/-15V OpAmp circuits while finding supply voltage limits for a connected 3.3V or (TTL) 5V circuit.
4. The reason I just stole from Colin: 5V at 1A from a TM504 (high power slot at the right) or the like.

Raymond


Re: PS503A Mod FF Photos?

 

On Sat, Aug 22, 2020 at 04:17 PM, Stephen wrote:


May I ask why one would need to modify a PS503A?
Can’t you adjust and fine tune the 20V supply? That’s what i do on mine...
🤷‍♂️
A few reasons come to mind:
1. I may want to use the +/- 20V lines and supply my ECL logic as well (-5.2V nominal). It *is* a triple-voltage supply...
2. I may be using the +/- 20V lines, at the same time wanting to supply my Raspberry Pi 3B+, which doesn't like being fed less than 5.1V (or so).
3. I may want to supply my +/-15V OpAmp circuits while finding supply voltage limits for a connected 3.3V or (TTL) 5V circuit.
4. The reason I just stole from Colin: 5V at 1A from a TM504 (high power slot at the right) or the like.

Raymond


Re: Oscilloscope Operator Training Kit - TNGTDS01

 

Thanks for the idea on generating glitches Harvey,
I have been working through the Tek TDS3 Training Manual using bench generators.  An HP 3314A function generator has proven helpful for generating irregular waveforms -- but I had to re-learn how to operate it.  Next I'm going to try a noise generator to see if the scope will capture single frames.
I built a 100 kHz? EICO 425k in my teens, graduated to a Dumont 2 MHz scope; then to an 18 MHz, 75-pound, 500-watt, Tek 513; followed by a 100 MHz 465; and finally to this 500 MHz (and quite sensitive) TDS3052B.  My head is still spinning from the myriad of features found in these "digital phosphor" scopes.
Bruce, KG6OJI


Re: FG 504 problems

 

On Sat, Aug 22, 2020 at 06:24 PM, Raymond Domp Frank wrote:


I just added a version of that document with bookmarks on the TekWiki page:

http://w140.com/tekwiki/wiki/Common_Design_Parts_Catalogs

I think the original version may be removed
At least in my Chrome browser, the bookmarks aren't shown online. Firefox and downloaded document are ok.

Raymond


Re: FG 504 problems

 

On Sat, Aug 22, 2020 at 03:09 PM, Stephen wrote:


I took the TEK parts number you provided and checked the reference from this
document:

http://w140.com/tek_xref_free.pdf

You should download it. It will make your life a lot easier.
I just added a version of that document with bookmarks on the TekWiki page:

http://w140.com/tekwiki/wiki/Common_Design_Parts_Catalogs

I think the original version may be removed

Raymond


Re: FG 504 problems

Stephen
 

On Sat, Aug 22, 2020 at 04:08 AM, Colin Herbert wrote:


Yes, the cost was involved in my decision. The one from the US was cheaper and
the postage wasn't too bad. Also, the French vendor wasn't someone I had dealt
with before, so I was a bit reticent to throw a significant amount of cash at
an unknown, especially considering the plethora of fakes and dodgy electronic
bits that can come up on eBay from time-to-time. I thought that the US vendor
was a safer bet on that account, too.
Understandable.

Incidentally, I am an idiot; I had a copy of the document that Stephen posted,
but I didn't look it up and use it!
Colin.
Since someone here sent me a link to this document, it’s almost become my bedside book! 😂😂😂


Re: PS503A Mod FF Photos?

Stephen
 

On Sat, Aug 22, 2020 at 03:47 AM, Colin Herbert wrote:


You have a point, there. I just thought that the +5 VDC supply might give you
more current to play with, which is so, but using it in a high-power bay, you
have 1 A available to the 0-20 VDC supplies, rather than 400mA. I suppose
someone must have thought it a good idea for the folk without a high-power
bay.
Colin.
This might indeed be the reason. Because otherwise I don’t see what this mod would add to the table...
You’re probably right.


Re: FG 504 problems

Colin Herbert
 

Yes, the cost was involved in my decision. The one from the US was cheaper and the postage wasn't too bad. Also, the French vendor wasn't someone I had dealt with before, so I was a bit reticent to throw a significant amount of cash at an unknown, especially considering the plethora of fakes and dodgy electronic bits that can come up on eBay from time-to-time. I thought that the US vendor was a safer bet on that account, too.
Incidentally, I am an idiot; I had a copy of the document that Stephen posted, but I didn't look it up and use it!
Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Stephen
Sent: 22 August 2020 15:13
To: TekScopes@groups.io
Subject: Re: [TekScopes] FG 504 problems

On Sat, Aug 22, 2020 at 02:49 AM, <tenareze32@gmail.com> wrote:


That is a useful document, many thanks for the link.
My pleasure.

The LH0022CH is available in France and you might get it sooner from them.
https://www.ebay.fr/itm/ci-LH-0022-CH-ic-LH0022CH-pattes-dorees-de-chez-NS-boitier-TO99/201440559996?hash=item2ee6cb037c:g:KTcAAOSwU~FWDPBK
Simon
Whaoo! That’s an expensive little thing!!!


Re: Tek 465: CH1 No signal, CH2 signal reads a fraction of input, V Pos distorts signal

Roger Evans
 

Luis,

It is fairly convincing that R429 is broken and responsible for the vertical deflection errors, you can check by measuring for resistance from the ends of R427 and R428 to ground. It should be a single turn trimpot so the fact that it continues to rotate is an indication that the adjuster is not moving the wiper and possibly the wiper is completely detached leaving no connection to ground.

Either way you need to find a replacement for this 250R preset that has about the right spacing of its fixing pins. Did you make a note of the position of R455 before you tried adjusting it? If so then put it back to that position as a starting point for your adjustments after replacing R429.

Regards,

Roger


Re: Tek 465: CH1 No signal, CH2 signal reads a fraction of input, V Pos distorts signal

Greenpitu@...
 

Just wanted to add another observation:

If I calibrate V amplifier bias for maximum deflection (as per service manual), I no longer experience signal distortion and expansion or compression when operating the V pos dial. However the signal shown is 350mV, instead of the 300mV supposedly delivered by the onboard calibration.

I should be able to get hold of a second (and calibrated) scope in the upcoming weeks and make more accurate readings.

Regards


Re: PS503A Mod FF Photos?

Colin Herbert
 

You have a point, there. I just thought that the +5 VDC supply might give you more current to play with, which is so, but using it in a high-power bay, you have 1 A available to the 0-20 VDC supplies, rather than 400mA. I suppose someone must have thought it a good idea for the folk without a high-power bay.
Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Stephen
Sent: 22 August 2020 15:18
To: TekScopes@groups.io
Subject: Re: [TekScopes] PS503A Mod FF Photos?

May I ask why one would need to modify a PS503A?
Can’t you adjust and fine tune the 20V supply? That’s what i do on mine... 🤷‍♂️


Re: PS503A Mod FF Photos?

Stephen
 

May I ask why one would need to modify a PS503A?
Can’t you adjust and fine tune the 20V supply? That’s what i do on mine... 🤷‍♂️


Re: FG 504 problems

Stephen
 

On Sat, Aug 22, 2020 at 02:49 AM, <tenareze32@gmail.com> wrote:


That is a useful document, many thanks for the link.
My pleasure.

The LH0022CH is available in France and you might get it sooner from them.
https://www.ebay.fr/itm/ci-LH-0022-CH-ic-LH0022CH-pattes-dorees-de-chez-NS-boitier-TO99/201440559996?hash=item2ee6cb037c:g:KTcAAOSwU~FWDPBK
Simon
Whaoo! That’s an expensive little thing!!!

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