开云体育

ctrl + shift + ? for shortcuts
© 2025 Groups.io
  1. TekScopes
  2. Messages
Expanded Topics Messages Polls
Date
Re: Service Maual for TM502 frame

 

My TM504 is very clearly marked with a sticker that only the right
most compartment is high power and the other three compartments have
the switch cut-outs which disable high power.

On Tue, 29 Jan 2013 19:09:30 -0500, Ray <w4byg@...> wrote:

Dennis,

Thank you for your comments. I appreciate your inputs.

I have a TM501, TM502A and a TM504 as well as about 8 modules to go in
them. The TM501 has a lighter 35 watt max supply. the TM502A has the
high power supplies for the dual modules that require it. The TM504 has
a combo of 2 normal and the last 2 compartments on the right will
support the higher power required by the SC504 scope and the like. So
there are a good bit of component variations and locations in the above.

Ray, W4BYG
Re: Tek 2235 power issue - A6RT901

 

RT901 is 10 Ohm, measures 10-15 ohm out of circuit. Shouldn't really have a hole in it tho' JC

--- In TekScopes@..., "electric_quattro" wrote:

Hi everyone,

I have just acquired this scope which was sold as not powering on. Once opened up I spotted that RT901 which sits on board A6 had a hole in it. I also measured it at 15ohms out of circuit.

According to the service manual this is a 100ohm thermal resistor, 10%, NTC. However, I am having problems finding a replacement in the UK. Is this part known under a different name?

I've taken a photo which I will add to the site.

Any help greatly appreciated.

Thanks

Alex
Re: Tek 2235 power issue - A6RT901

Tom Jobe
 

开云体育

Hi Alex,
I have a good 2235 A6 board that has been removed from a scope, and RT901 measures 15 Ohms in circuit.
The component has no other markings (of use) other than "10 Ohm" (where Ohm is the Ohm symbol).
The A6 schematic shows it as a "10 ohm" part as well.
A?look around the Mouser web site suggests that it might be called an "NTC?thermistor".
Look at this link:
There are links to the datasheets for most of the thermistors, and I would guess that you could figure out the amperage backwards from the physical size of the?RT901 you have.
There is about 20 mm of vertical room under the plastic cover for the thermistor, but?there is room to lay?it over a bit to get some extra space.
I?would consider putting in the highest rated part?there was the?physical room for.
From reading some of the data sheets, it looks like the thermistors have a resistance around 3k to 4k when they are hot.
Perhaps one of the members will be able to add onto this story about thermistor characteristics.
Your local suppliers should be able to help you once you figure out what you want.
tom jobe...
?
?
?

----- Original Message -----
Sent: Tuesday, January 29, 2013 2:31 PM
Subject: [TekScopes] Tek 2235 power issue - A6RT901

?

Hi everyone,

I have just acquired this scope which was sold as not powering on. Once opened up I spotted that RT901 which sits on board A6 had a hole in it. I also measured it at 15ohms out of circuit.

According to the service manual this is a 100ohm thermal resistor, 10%, NTC. However, I am having problems finding a replacement in the UK. Is this part known under a different name?

I've taken a photo which I will add to the site.

Any help greatly appreciated.

Thanks

Alex
Re: 2215A

 

Just want to correct this, the 2215A is a 60MHz scope based on the 2235, in fact you could easily reconvert this to a 2235 with the addition of a few components. It uses the same CRT and is actually an excellent scope. OP, Hope you bought it from the pawn shop for a good price.
JC

--- In TekScopes@..., "Steve" wrote:

Dave,
2215 is a very low BW scope, and hence not worth much. I would say in working condition, $25-30 is the most it is worth. You probably won't get a pawn shop to go down that low, as they won't under stand BW and why a 20 MHz scope is worth much less than a 200 MHz one.
- Steve
Re: Service Maual for TM502 frame

Ray
 

Dennis,

Thank you for your comments. I appreciate your inputs.

I have a TM501, TM502A and a TM504 as well as about 8 modules to go in them. The TM501 has a lighter 35 watt max supply. the TM502A has the high power supplies for the dual modules that require it. The TM504 has a combo of 2 normal and the last 2 compartments on the right will support the higher power required by the SC504 scope and the like. So there are a good bit of component variations and locations in the above.

Ray, W4BYG
Re: Service Maual for TM502 frame

 

开云体育

As you probably discovered by now, there was no TM502. There was only a TM502A.

All of the TM5xx mainframes are virtually identical in the most important respect – how power is provided to the plugins. They all use a classic transformer power supply. So if you have schematics for one TM5xx power supply almost everything will be similar in you TM502 except for the location of the parts and some parts values.

?

The TM5003 and TM5006 used switching power supplies to save weight so they are significantly different.

?

From: Ray, Sent: Sunday, January 27, 2013 12:44 PM

Looking site to download a manual for my TM502 (it holds my SC504 scope).? Bama doesn't have one listed nor do I see one in a web search.? Anyone able to offer any help?

Your attention is appreciated.
Ray, W4BYG
Re: pinout for mosfet to-3

 

开云体育

Jerry,

This drawing would be clear to anyone who ever had to read a mechanical drawing or to anyone who had a mechanical drawing class in school.

?

There are several clues in the way the drawings are shown which follow standard mechanical drawing conventions. Your local library will have introductory books on mechanical drawing that can show you more of the conventions. Knowing how to read a mechanical drawing is something that is almost essential for anyone working in electronics.

·???????? Solid lines in a mechanical drawing are used to show the shape and dimension of things that are directly visible.

·???????? Dotted lines are used to indicate the shape, dimension, and (on occasion, the depth) of something that is not visible.

·???????? There will always be three mechanical drawings, each from a different orthogonal axis, unless because of symmetry or because the shape is simple, only two are necessary, as in this case.

·???????? When there are three drawings they will be aligned with each other, and at right angles. These three orthogonal (right angle) drawings provide an unambiguous description of the object’s shape and dimension.

·???????? When combined with the dotted lines, portions of the object that are not visible can be unambiguously determined. ?

·???????? Finally, it is a convention to show the bottom view of the pin outs unless it is stated otherwise.

Dennis

?

From: jerry massengale, Sent: Monday, January 28, 2013 12:00 PM

Hi,

The drawing is ambiguous for anyone who in in doubt about the meaning of the dashed lines. That the drawing was a bottom drawing was my conclusion also. I have another vendors footprint that is reversed and does not have the dotted line. It is the top view I am sure. Some vendors show the angle drawing that is unambiduous. I am planning a device that will use a test socket that will handle Bipolar and Mosfet devices. I would rather not make it wrong. My poor old head is easily confused.

?

?

Jerry Massengale

-----Original Message-----
From: Ladislao Bastetti <lbastetti001@...>
To: TekScopes <TekScopes@...>

Hi , the drawing is not ambiguous , the two round dashed lines (the round dome over the case) mean that are not directly visible, so the view is from bottom .

Laszlo

2013/1/28 David <davidwhess@...>

?

That is the one I found as well. The problem with it is that the
diagram showing the pinout on the last page is ambiguous about it
being the top or bottom view. As far as I know, they are always the
bottom view.

Some data sheets use an isometric drawing or label top and bottom to
resolve the ambiguity.


On Mon, 28 Jan 2013 19:12:34 -0000, "g_kupka" ghm1@...> wrote:

>Hi Jerry
>
>Look here:
>
>Gerhard
>
>--- In TekScopes@..., jerry massengale wrote:
>>
>> Hi,
>>
>> I cannot find a good datasheet for a to-3 mosfet like a irf440 that shows the pinout. The only one I found would be okay if they had said if it is a top or bottom view.
>>
>> Jerry Massengale
Tek 2235 power issue - A6RT901

 

Hi everyone,

I have just acquired this scope which was sold as not powering on. Once opened up I spotted that RT901 which sits on board A6 had a hole in it. I also measured it at 15ohms out of circuit.

According to the service manual this is a 100ohm thermal resistor, 10%, NTC. However, I am having problems finding a replacement in the UK. Is this part known under a different name?

I've taken a photo which I will add to the site.

Any help greatly appreciated.

Thanks

Alex
Re: Tek 1240/1241 modules: Any use? Sell? Barter?

Alexandre Souza - Listas
 

The 1240 is infamous for having a pacemaker battery as the backup power
for the SRAM. After many years, it leaks nasty stuff all over the processor
board. I've replaced that battery with a more modern lithium battery on my
units.
That is what happened to mine :(

Sadly, I rarely power up my 1240s (100Mhz), or my Tektronix 3001GPX
(1Ghz) anymore.
I had a 3001GPX for a time, but never found the pods to buy. Gave it away to a friend (which never found the pods,anyway). I use my HP16500C a LOT, even doing reverse assembly work.
Re: 465B +5V

 

"I understand some tants have a bad habit of going bad, and it sure would be nice to know their board designations and, even better, their locations."
that info in the first archive group at:

--- In TekScopes@..., "jreeder75006" wrote:

I'm getting +.79V on the +5V section of my 465B. I only see .7V out of the rectifier, but about 9VAC in (don't know how I see less out of the bridge than on +5V test).

Cap on output of bridge looks like a cap on a meter with power off.

I see about 80 ohms on +5V test. Of course, that's with power off and therefore static, but seems reasonable.

Has anyone ever tried a 7805 in place of the regulator circuit, just in case the regulator circuit is bad?

Sure would like to get hold of a schematic and board layout. The service manual I downloaded only has block diagrams. I understand some tants have a bad habit of going bad, and it sure would be nice to know their board designations and, even better, their locations. At 69, the eyes need all the help they can get.

In the past, I have heard a click shortly after turning on. I saw a thermal in there the other night. Wonder if that's the click and what it's for.
Re: Motorola SC67127 processor for 2464

 

Glad you found the problem.

I had a 6808 go bad in a 2445 and fixed it a few weeks ago. The A8 address output line failed in a sort of open floating state.

Do you have any indication of what the failure on the 6802/8 was?

John

--- In TekScopes@..., "poolguy967" wrote:

Hello all-

After going through the troubleshooting guide for my 2465DMS, I believe that I have a bad microprocessor. The service manual references a 6802 processor, but the physical chip is labeled SC67127P.

So... I Google around for the 67127 without much luck. Where does a guy find these old uP's???

Thanks as always. This is an incredible forum.

Rich
Re: Tek 1240/1241 modules: Any use? Sell? Barter?

 

If the pods include the p6460 *with* the plug-in wire grabbers, I've often
seen them go for more than the 1240 analyzers themselves on ebay.
And shipping from Brazil should be a lot less than the mainframe itself, I hope.

Not sure what anyone would do with the X86 stuff these days, unless they were
building a retro-computing project of some sort. I've never actually seen any of
the expansion packs.

The 1240 is infamous for having a pacemaker battery as the backup power
for the SRAM. After many years, it leaks nasty stuff all over the processor
board. I've replaced that battery with a more modern lithium battery on my
units.

Sadly, I rarely power up my 1240s (100Mhz), or my Tektronix 3001GPX (1Ghz) anymore.
Unless I need a ton of signals, I usually pull out a Saleae Logic16 instead, and I'm still tempted
to pick up a 34 channel Intronix Logicport if I needed to go to 500Mhz (yes, I'm aware of the limitations
of both of these units).

Scott

On 1/28/2013 6:41 PM, Alexandre Souza - Listas wrote:
Today was a happy day!

A good friend of mine called me on his house, because he found "some HP
junk" and wanted me to drag it out.

And I found a complete set of tools for 1240/12xx (color model) Tektronix
Logic Analysers, with 8086 pod, 80186 pod, 80286 pod (all in mint
condition), mostly (if not) all the ROM packs, the 64K ram expansion,
serial/parallel expansions, common pods, the whole nine yards! Just misses
the analyser itself (I got it early, but it had the main processor board
fried by the supercap eletrolite which leaked) and some more junk, a

Is someone in need of the fluke and tektronix parts? I don't think I'll
use it in a lifetime. Remember I'm in Brazil :o)

Thanks
Alexandre Souza

---
Enviado do meu Motorola PT550
Meu site:



------------------------------------

Yahoo! Groups Links
Re: Motorola SC67127 processor for 2465

 

That's great! I was really expecting you to come back and say "I put in the new processor and it doesn't work".
This is the first uP failure that I have heard of in a 2465x scope.

--Victor
Re: TDS 744A colour shutter

 

OK, I ended up buying the panel Dan mentioned below as I could never get the screen settings to hold properly on that other panel someone recommended. I just got new panel today, and it is a 16:9 panel, not a 4:3 panel! My bad as I should have pulled the datasheet for the panel I suppose, although the listing states it is 4:3. So, I am now out $150 and still don't have a workable solution. Argh!

Does anyone know for sure where a suitable 7" 640*480 4:3 LCD and controller can be found for these scopes? Please? (whimper...)

Thanks.

Jay

--- In TekScopes@..., "jayw_comark" wrote:

Thanks Dan,

I'll fiddle around with this one for a bit, and if I don't get anywhere with it, I'll give that one a try.

Weird, every LCD controller I've ever seen (And I've seen a lot as I work in the industrial computer field) always saves the settings after a power cycle. On this one, I can get everything all set up perfectly, then remove the VGA cable from it and allow it to go to sleep. When I reconnect the VGA cable, the settings are lost. So, not even a power cycle is required. To me, this is a serious bug! Additionally, when I use the OSD and select auto config, it still can't set the horizontal and vertical properly.

Jay

--- In TekScopes@..., Dan Fish wrote:

I bought from nyjtouch (for example

about $60) and after doing the automatic screen size and automatic video
setting, I have not had to touch it since. The screen angle was default
as view-from-below and I left it there because I keep the scope on a
shelf above me. If you would rather view-from-above then figure that
out and reverse the screen before attaching to the scope.

Dan


Hi Picredburner,

I went ahead and bought one of thess LCDs and am having a bit of
trouble with it - hoping you may be able to help.

I got it to power up and display fine, and I was able to set the
brightness using the menu buttons. However, when it powers up the
vertical and horizontal are a bit off. I was able to adjust this
through the menu as well, but after a power cycle these settings are
lost and I have to adjust both H and V again. Brightness settings are
remembered, though. Did you have a similar problem?

Thanks.

Jay
Re: My 453 is tough to twist

 

Good idea....

I was able to get all the knobs off of the unit. The plastic ring was a bit tight. I driped a drop of 3/1 oil onto the concentric part of the shaft and we'll see what it does.

Thanks everyone for your input.

klc

--- In TekScopes@..., David wrote:

I picked up an oiler from a local hobby shop and filled it with the
spray contact cleaner and lubricant that I have. The thin needle
makes it easy to reach in and apply the oil to specific spots without
Re: My 453 is tough to twist

 

I picked up an oiler from a local hobby shop and filled it with the
spray contact cleaner and lubricant that I have. The thin needle
makes it easy to reach in and apply the oil to specific spots without
making a mess.

A couple of times I have found stuck shafts on Tektronix equipment
where the problem was entirely caused by a tight fitting plastic
grommet right under the knob. Most of the time though the plastic cam
inside the switch split but I am not sure the 453 uses that design. I
was not able to find any useful pictures of the sweep switch assembly.

On Tue, 29 Jan 2013 17:33:56 -0000, "one6146" <one6146@...>
wrote:

T,
As far as oil, thats watt I did last night. The Break Free is a good idea. The other possibility is drilling out the allen screws and replacing the knob. The scope is not earning its keep. And i've got to get my RM 45 working as its not working either....

klc
--- In TekScopes@..., "Tom Miller" wrote:

Maybe you can still run it down the center of the knob?

I use PB Blaster penetrating oil with good results. Or a good gun oil like Break-free CLP?

Regards,
Tom
Re: My 453 is tough to twist

 

T,
As far as oil, thats watt I did last night. The Break Free is a good idea. The other possibility is drilling out the allen screws and replacing the knob. The scope is not earning its keep. And i've got to get my RM 45 working as its not working either....

klc

--- In TekScopes@..., "Tom Miller" wrote:

Maybe you can still run it down the center of the knob?

I use PB Blaster penetrating oil with good results. Or a good gun oil like Break-free CLP?



Regards,
Tom

----- Original Message -----
From: one6146
To: TekScopes@...
Sent: Tuesday, January 29, 2013 11:11 AM
Subject: [TekScopes] Re: My 453 is tough to twist



Thanks for the inputs..... Now I can't get the plastic knobs off. The 'red' one came off ok; on the 'gray', I can't get the allen wrench into the set screw. This is going to be a fun project.
klc
--- In TekScopes@..., "Tom Miller" wrote:
>
> Take the knob off and try dripping it down the shaft. A little at a time and let it soak in for a while.
>
> Tom
>
> ----- Original Message -----
> From: one6146
> To: TekScopes@...
> Sent: Monday, January 28, 2013 6:31 PM
> Subject: [TekScopes] Re: My 453 is tough to twist
>
>
>
> Lars,
> Thanks for the input. What I'm trying to figure out is a way to lubricate the switch without having to remove most of 'scopes' parts. This thing is packed tighter than a sardine can. Is there is an easier way?
>
> k
>
> --- In TekScopes@..., Lars Ahlstr?m wrote:
> >
> > That switch wants to swim in electronic spray with some oil components in
> > it.
> > You know that crap that makes your fingers slippery. ;)
> >
> > The rod is probably heavily in love with some old, surrounding, once nice
> > smoothly slippery, now glue-ish molybdensulfide-like material.
> >
> > It gets resurrected by mixing in some fresh "you know what". (that spay is
> > sold with various brandnames, in Sweden we call it "EMF200F (also very good
> > for potentiometer carbon tracks) or CRC 5-56 (Do not use 5-56 on
> > potentiometers, will kill the carbon tracks directly))
> >
> > Preffossor Lars
> >
> >
> >
> >
> >
> >
> >
> >
> > From: TekScopes@... [mailto:TekScopes@...] On Behalf
> > Of one6146
> > Sent: den 28 januari 2013 19:42
> > To: TekScopes@...
> > Subject: [TekScopes] My 453 is tough to twist
> >
> >
> >
> >
> >
> > I'm striking out with the search engine. My 453 " Time/DIV " switch is
> > getting very hard to turn. Watt I'd like to do is to lubricate it and see if
> > she'll work for me.
> >
> > Is there an easy way to get to this thing, or do I have to go the surgical
> > route? The manual says to get Tek 006-0220-00 which includes the lubrication
> > schedule and instructions. No luck Googeling it.... ..
> >
> > thanks
> >
>
Tek scopes for sale at Orlando HamCation Feb 7,8,9

Bob W5UQ 2
 

开云体育

I will be there Thursday afternoon, Friday and Saturday until early afternoon.? (Feb. 7, 8 and 9)
Look for my four tables in the swap building next to restrooms.?

My? equipment is guaranteed to work.? I have checked calibration on it all and repaired whatever was necessary.

I'll have some Tektronix scopes and other scopes and HP signal generators (8640A and B)

Look for my big Yellow Sign with W5UQ.COM on it.?
Near the center of building.

Bob Hardie
W5UQ 
-- 
...

Re: manual for 013-0099-00

Tom Jobe
 

开云体育

Thanks Pete,
This downloading method worked perfectly.
You even have pictures of the later A1007 version!
tom jobe...
?
?
?
?

----- Original Message -----
From: cnc_joker
Sent: Tuesday, January 29, 2013 8:53 AM
Subject: [TekScopes] Re: manual for 013-0099-00

?



Some people have had problems getting my pictures so I
have put them up on the net for a while.















I will leave them up for a few weeks so If you are interested
then you should grab them.

Pete.

--- In TekScopes@..., "cnc_joker" wrote:
>
>
>
> I have taken some high resolution pictures of the insides of
> the FET adapter and two different generations of the
> transistor/FET adapters. I can send them to you if you
> would like. They cannot be completely
> disassembled without a lot of un-soldering. However, you
> can see the traces on the reverse side as shadows in my pictures.
>
> Pete.
>
> --- In TekScopes@..., jerry massengale wrote:
> >
> >
> > Hi,
> >
> > I need documentation on tek's fet adapter for curve tracers.
> >
> >
> >
> > Jerry Massengale
> >
>
Re: manual for 013-0099-00

cnc_joker
 

Some people have had problems getting my pictures so I
have put them up on the net for a while.















I will leave them up for a few weeks so If you are interested
then you should grab them.

Pete.

--- In TekScopes@..., "cnc_joker" wrote:



I have taken some high resolution pictures of the insides of
the FET adapter and two different generations of the
transistor/FET adapters. I can send them to you if you
would like. They cannot be completely
disassembled without a lot of un-soldering. However, you
can see the traces on the reverse side as shadows in my pictures.

Pete.

--- In TekScopes@..., jerry massengale wrote:


Hi,

I need documentation on tek's fet adapter for curve tracers.



Jerry Massengale
121961 - 121980 of 208714