Date   

Suface Mount Spreadsheet

Chris Moore <chris2phermoore@...>
 

Hi folks,

Here is a spreadsheet a Navy electronics man made and gave me. I hope you find it useful. You can add to it as needed. Please note the multiple tabs at the bottom. He has spent a lot of time on this thing.

Chris


Re: What value is this chip capacitor?

fjh001
 

Probably the right part number is SMBJ12A, since device code is LE (the other letter and number after the Fairchild logo are factory and date codes). Since it has a polarity band, it is not the bidirectional SMBJ12CA.

http://www.fairchildsemi.com/pf/SM/SMBJ6V0A.html
http://www.fairchildsemi.com/ds/SM/SMBJ6V0A.pdf

Regards,

Javier

El 16/06/2011 19:24, Stefan Trethan escribi�:


First line is plant / date code, only second line is part identification.

<http://www.marsport.org.uk/smd/mainframe.htm> identifies it as
SM6T6V8CA ST - SMB bi-directional transil 6.8V 600W


Which is not from Fairchild, but would make an awful lot of sense looking at how it is mounted as a crowbar on a supply line. I expect this is the equivalent part from fairchild.

ST


On Thu, Jun 16, 2011 at 6:00 PM, Jim Reese <nfeinc@... <mailto:nfeinc@...>> wrote:



It appears to have the Fairchild Semiconductor logo and then the
T302LE number. Doesn't come up anywhere I can find.
I would suspect it might be a diode.
Regards,
Jim

--- On *Thu, 6/16/11, GeorgeP /<@georgeplhak
<mailto:@georgeplhak>>/* wrote:


From: GeorgeP <@georgeplhak <mailto:@georgeplhak>>
Subject: [TekScopes] What value is this chip capacitor?
To: TekScopes@... <mailto:TekScopes@...>
Date: Thursday, June 16, 2011, 11:43 AM




This is not a Tek related question. Please forgive my asking
this incredibly knowledgeable group this question:
What is the value of this cap chip? I don't know how to read
it. Thanks! George





--
------------------------------------------------------------------------
Javier Herrero EMAIL: jherrero@...
Chief Technology Officer
HV Sistemas S.L. PHONE: +34 949 336 806
Los Charcones, 17 FAX: +34 949 336 792
19170 El Casar - Guadalajara - Spain WEB: http://www.hvsistemas.com


Re: What value is this <chip capacitor> transil?

Chris Moore <chris2phermoore@...>
 

My search also comes up with smbj12a from fairchild.

Chris



From: GeorgeP
To: TekScopes@...
Sent: Thursday, June 16, 2011 2:25 PM
Subject: [TekScopes] Re: What value is this transil?

 
Thank you! Everyone.

I had ASSUMED that it was a capacitor because of its location across the +5VDC supply of a Seagate hard drive. The actual faulted part had blown up and was certainly shorted. Removing it allowed the customer's C: drive to live again, long enough to be cloned - certainly a close call.

Again, thank you!

George

--- In TekScopes@..., Stefan Trethan wrote:
>
> First line is plant / date code, only second line is part identification.
>
> identifies it as
> SM6T6V8CA ST - SMB bi-directional transil 6.8V 600W
> Which is not from Fairchild, but would make an awful lot of sense looking at
> how it is mounted as a crowbar on a supply line. I expect this is the
> equivalent part from fairchild.
>
> ST
>
>
> On Thu, Jun 16, 2011 at 6:00 PM, Jim Reese wrote:
>
> >
> >
> > It appears to have the Fairchild Semiconductor logo and then the T302LE
> > number. Doesn't come up anywhere I can find.
> >
> > I would suspect it might be a diode.
> >
> > Regards,
> >
> > Jim
> >
> > --- On *Thu, 6/16/11, GeorgeP * wrote:
> >
> >
> > From: GeorgeP
> > Subject: [TekScopes] What value is this chip capacitor?
> > To: TekScopes@...
> > Date: Thursday, June 16, 2011, 11:43 AM
> >
> >
> >
> >
> > This is not a Tek related question. Please forgive my asking this
> > incredibly knowledgeable group this question:
> > What is the value of this cap chip? I don't know how to read it. Thanks!
> > George
> >
> >
> >
> >
> >
> >
>




Re: What value is this <chip capacitor> transil?

GeorgeP
 

Thank you! Everyone.

I had ASSUMED that it was a capacitor because of its location across the +5VDC supply of a Seagate hard drive. The actual faulted part had blown up and was certainly shorted. Removing it allowed the customer's C: drive to live again, long enough to be cloned - certainly a close call.

Again, thank you!

George

--- In TekScopes@..., Stefan Trethan <stefan_trethan@...> wrote:

First line is plant / date code, only second line is part identification.

<http://www.marsport.org.uk/smd/mainframe.htm> identifies it as
SM6T6V8CA ST - SMB bi-directional transil 6.8V 600W
Which is not from Fairchild, but would make an awful lot of sense looking at
how it is mounted as a crowbar on a supply line. I expect this is the
equivalent part from fairchild.

ST


On Thu, Jun 16, 2011 at 6:00 PM, Jim Reese <nfeinc@...> wrote:



It appears to have the Fairchild Semiconductor logo and then the T302LE
number. Doesn't come up anywhere I can find.

I would suspect it might be a diode.

Regards,

Jim

--- On *Thu, 6/16/11, GeorgeP <george@...>* wrote:


From: GeorgeP <george@...>
Subject: [TekScopes] What value is this chip capacitor?
To: TekScopes@...
Date: Thursday, June 16, 2011, 11:43 AM




This is not a Tek related question. Please forgive my asking this
incredibly knowledgeable group this question:
What is the value of this cap chip? I don't know how to read it. Thanks!
George






Re: What value is this chip capacitor?

Chris Moore <chris2phermoore@...>
 

I agree with Ed Breya. Thanks.


From: Ed Breya
To: TekScopes@...
Sent: Thursday, June 16, 2011 2:00 PM
Subject: [TekScopes] Re: What value is this chip capacitor?

 
Stephan, that is a great information site. Thanks for posting it. Ed

--- In TekScopes@..., Stefan Trethan wrote:
>
> First line is plant / date code, only second line is part identification.
>
> identifies it as
> SM6T6V8CA ST - SMB bi-directional transil 6.8V 600W
> Which is not from Fairchild, but would make an awful lot of sense looking at
> how it is mounted as a crowbar on a supply line. I expect this is the
> equivalent part from fairchild.




Re: What value is this chip capacitor?

Ed Breya
 

Stephan, that is a great information site. Thanks for posting it. Ed

--- In TekScopes@..., Stefan Trethan <stefan_trethan@...> wrote:

First line is plant / date code, only second line is part identification.

<http://www.marsport.org.uk/smd/mainframe.htm> identifies it as
SM6T6V8CA ST - SMB bi-directional transil 6.8V 600W
Which is not from Fairchild, but would make an awful lot of sense looking at
how it is mounted as a crowbar on a supply line. I expect this is the
equivalent part from fairchild.


Re: What value is this chip capacitor?

stefan_trethan
 

First line is plant / date code, only second line is part identification.

<http://www.marsport.org.uk/smd/mainframe.htm> identifies it as
SM6T6V8CA ST - SMB bi-directional transil 6.8V 600W

Which is not from Fairchild, but would make an awful lot of sense looking at how it is mounted as a crowbar on a supply line. I expect this is the equivalent part from fairchild.

ST


On Thu, Jun 16, 2011 at 6:00 PM, Jim Reese <nfeinc@...> wrote:


It appears to have the Fairchild Semiconductor logo and then the T302LE number. Doesn't come up anywhere I can find.
 
I would suspect it might be a diode.
 
Regards,
 
Jim

--- On Thu, 6/16/11, GeorgeP <george@...> wrote:

From: GeorgeP <george@...>
Subject: [TekScopes] What value is this chip capacitor?
To: TekScopes@...
Date: Thursday, June 16, 2011, 11:43 AM




This is not a Tek related question. Please forgive my asking this incredibly knowledgeable group this question:
What is the value of this cap chip? I don't know how to read it. Thanks! George






Re: What value is this chip capacitor?

Dave Wise
 

Fairchild doesn't make caps, as far as I know.  They do make diodes by the millions.
 
Dave Wise


From: TekScopes@... [mailto:TekScopes@...] On Behalf Of J
Sent: Thursday, June 16, 2011 9:05 AM
To: TekScopes@...
Subject: Re: [TekScopes] What value is this chip capacitor?

Doesn't appear to have any tol / voltage markings either.  Leads look pretty big for a cap too!

 


From: Jim Reese
To: TekScopes@...
Sent: Thu, June 16, 2011 11:00:52 AM
Subject: Re: [TekScopes] What value is this chip capacitor?

 

It appears to have the Fairchild Semiconductor logo and then the T302LE number. Doesn't come up anywhere I can find.
 
I would suspect it might be a diode.
 
Regards,
 
Jim

--- On Thu, 6/16/11, GeorgeP wrote:

From: GeorgeP
Subject: [TekScopes] What value is this chip capacitor?
To: TekScopes@...
Date: Thursday, June 16, 2011, 11:43 AM



This is not a Tek related question. Please forgive my asking this incredibly knowledgeable group this question:
What is the value of this cap chip? I don't know how to read it. Thanks! George



 


Re: What value is this chip capacitor?

rpoz28cam
 

Doesn't appear to have any tol / voltage markings either.  Leads look pretty big for a cap too!

 


From: Jim Reese <nfeinc@...>
To: TekScopes@...
Sent: Thu, June 16, 2011 11:00:52 AM
Subject: Re: [TekScopes] What value is this chip capacitor?

 

It appears to have the Fairchild Semiconductor logo and then the T302LE number. Doesn't come up anywhere I can find.
 
I would suspect it might be a diode.
 
Regards,
 
Jim

--- On Thu, 6/16/11, GeorgeP wrote:

From: GeorgeP <george@...>
Subject: [TekScopes] What value is this chip capacitor?
To: TekScopes@...
Date: Thursday, June 16, 2011, 11:43 AM



This is not a Tek related question. Please forgive my asking this incredibly knowledgeable group this question:
What is the value of this cap chip? I don't know how to read it. Thanks! George



Re: What value is this chip capacitor?

rpoz28cam
 

3000pf.. or .003 uf

 


From: GeorgeP
To: TekScopes@...
Sent: Thu, June 16, 2011 10:43:06 AM
Subject: [TekScopes] What value is this chip capacitor?

 

This is not a Tek related question. Please forgive my asking this incredibly knowledgeable group this question:

What is the value of this cap chip? I don't know how to read it. Thanks! George


Re: What value is this chip capacitor?

Jim Reese
 

It appears to have the Fairchild Semiconductor logo and then the T302LE number. Doesn't come up anywhere I can find.
 
I would suspect it might be a diode.
 
Regards,
 
Jim


--- On Thu, 6/16/11, GeorgeP wrote:

From: GeorgeP
Subject: [TekScopes] What value is this chip capacitor?
To: TekScopes@...
Date: Thursday, June 16, 2011, 11:43 AM



This is not a Tek related question. Please forgive my asking this incredibly knowledgeable group this question:
What is the value of this cap chip? I don't know how to read it. Thanks! George



What value is this chip capacitor?

GeorgeP
 

This is not a Tek related question. Please forgive my asking this incredibly knowledgeable group this question:

What is the value of this cap chip? I don't know how to read it. Thanks! George


Re: PG 509 Output circuit oddity

Ivan Cousins
 

Taking the output from the base-collector junction is not odd.
The base to collector junction is what goes into avalanche breakdown.
Driving the base-emitter junction is just a way to get the current started in the collector-base junction. The circuit on the board is connected as the schematic shows.
Try a transistor on a Tek576 curve tracer to see how it works.
Set the Tek576 series resistance high, 14K ohm(0.1Watt), so that the transistor does not burn out.
Simulations are OK, but a measurement is better.
I think Jim Williams would approve of the "measure it yourself approach".
John

--- In TekScopes@..., "dj0ud" <dj0ud@...> wrote:

Hello Tek friends,

after a look into the PG509 Manual

( <http://www.ko4bb.com/cgi-bin/manuals.pl?dir=Tektronix/Tektronix_-_TM-500_Series/Tektronix_-_PG-509> )

i found that the Avalance-Transistor output circuit
is a bit odd, all other Av-T circuits i have seen before takes the pulse from the emitter, in this circuit they took it from the base...!?!?

(The collector is, as usual, connected to the charge line)

Is that a drawing error or is that an for me unusual way to connect the Avl-Transistor?

Maybe a 509-Owner would/could peer onto the board, where the output is actually connected to?

Best regards,

73's

Jorgen
dj0ud


Re: 7854 Display Board problems

Albert <aodiversen@...>
 

Rob,
Without asking permission I put 4 photo's at your folder "7854 Readout Problem". All taken in scope mode and only one taken with ID on.
The strategy with ID on is different in that only visible characters take time (so 1V is shorter than 500mV), no delay time between characters, and the time per character is reduced (faster character colums scan).
Albert


OT Eprom Problem

Jerry Massengale <jmassen418a@...>
 

 
Hi,
 
I have been trying to fix a 9400 with no screen display and no front panel lights. I found that the clock to the front panel was not running. I then found that the microprocessor appeared to be running in a closed loop. Scoping the address and data lines showed no apparent problems. I swapped the 2.06AV firmware with 2.06 firmware from a parts unit and found that the front panel now comes alive and I have a partial display. I am assuming I have a problem in my 2.06AV eproms. It has been 15 years since I had to deal with eproms. Going out to ebay shows many programmers available. Can anyone advise me on an easy to use programmer? Can someone diagnose my set and correct the error?
 
jerry 



Re: Newbie shopping questions

Brad Thompson <brad.thompson@...>
 

On 6/16/2011 2:23 AM, ab1jx wrote:
OK, so rejuvination is out for my old 2213. It seems roughly analagous
to desulphating a lead acid battery in terms of mystique and success
rate. The TV repair shop I worked at in the 70s bought a Sencore
rejuvinator right before I left but I didn't stick around to hear any
case histories.<snip>
Hello, Alan--

I don't recall reading about the nature of the fault in your 2213's
CRT, but the classic fix in black-and-white TV days involved raising
the CRT's heater voltage by 10-20 percent.

In a B&W CRT, most of the electron emission takes place from a small
spot on the electron gun's cathode. As the CRT ages, the cathode coating
in the spot's area gets depleted and the picture dims. Raising the
heater voltage expands the emitting area, effectively changing the
emitting area from a spot to an annulus (ring).

On the downside, the ring-shaped emission area doesn't focus as well
as the original pinpoint spot did-- usually not an issue in TV viewing,
but possibly undesirable in a scope if the defocusing effect is extreme.

To increase the heater voltage, aftermarket TV accessory manufacturers
devised a "booster"-- basically an stepup autotransformer with all other
signals passed straight through to the CRT.

I recall reading an account by a TV service tech who answered a "dim picture" house call [1] and discovered that the set's owner had
cascaded four boosters and was running the CRT at roughly double its heater's design voltage.

I don't have the 2213's schematic available and it's possible
that the CRT's heater may be powered with high-frequency AC via
the HV supply. If that's the case and if space on the HV transformer
permits, you could try adding a well-insulated auxiliary winding
to the transformer and connecting it in series-aiding phase with the
existing CRT winding. You'd have to determine the number of turns
via experimentation. I haven't tried this fix, but perhaps someone
in the group has made the attempt.

When the CRT's heater is powered by a winding on a 60-Hz transformer
(e.g., on a 503 scope), it's possible to disconnect the existing
heater winding and patch in a separate filament transformer, adjusting
the primary voltage to deliver the proper voltage (in the case of a
core-to-winding short in the heater winding) or an elevated voltage
(for a dimming CRT). Make sure that the replacement heater transformer
has an adequate breakdown-voltage rating. IIRC, Prem Magnetics offered
4KV-rated filament transformers.

73--

Brad AA1IP


[1] Once upon a time, TV techs and physicians made house calls; nowadays, not even tree surgeons make house calls<g>.


Tek 500 series valved scopes. Any available?

fred.bloggs53
 

Just a quick call out to see if anyone may have one of the older Tek valve scopes for sale (or better still just surplus to requirements!) in North East England.....?
I have lots of modern scopes and other test gear but have always wanted to own an example of the breed to which we owe the phrase "built like an old Tek scope"!
Preferably one of the latter ones that would have sufficient performance to be a useful classic, working or not (but if not working then U/S CRT or burnt-out mains transformer would be a bit too broken!)
Cheers,
Jez.


Re: SG5010, SG505 performance

magnustoelle
 

Good Day,

nice work, Jeanette, thank you! Those FFTs are particularly useful and I do not think I ever came across any decent FFT plot of the popular HP 8903B on the web so far.

When looking at the Tek SG5010's performance, I agree that this is quite impressive. No wonder that all this has lead to the founding of AP in the end...

Side note: When comparing the HP 8903B FFT-plot with plots I have taken for the venerable HP 339A, its noise floor is lower, but its harmonics distortion products are worse. One can see the 8903B's first harmonic at about -95 dB, and one may compare this to this plot (kindly hosted by Ralf Ohmberger:
http://www.amplifier.cd/Test_Equipment/Hewlett_Packard/HP_analyzer/339A_rep_und_kal/FFT_1kHz_1Vrms_HP339A_Dec09.pdf 

Cheers,

Magnus


Re: Newbie shopping questions

ab1jx
 

OK, so rejuvination is out for my old 2213. It seems roughly analagous to desulphating a lead acid battery in terms of mystique and success rate. The TV repair shop I worked at in the 70s bought a Sencore rejuvinator right before I left but I didn't stick around to hear any case histories.

I'm looking at little at the 7704A and 7904 but they both seem bigger and more expensive than what I'm looking for. They look like they're at home on a cart, but I'm looking for something a little more portable (like my 2213). I might be able to carry them but I'd be constantly bumping into things (my legs, doorcasings) with them. Before I got laid off at 55 and retired with $400/month income I would have considered them.

What's with the 2336 YA? I've seen some on eBay with Buy It Nows around $100 with what seem like fairly minor problems: 140561752749 and one that sold. Also the 2335 looks interesting. It's a silly reason to consider one but I just like the way they look. (23xx)

If I got a 2235A or 2236A how many of my parts from my 2213 would fit I wonder? I was 1 of 2 bidders on a 2235A today that went for $110. I was trying to weigh the probabilty of getting ripped off again compared to the chance of getting outbid. I'd buy a 2213 or 2215 except I'd want to be sure it was a late model or one that got modified early on for this filament voltage problem.

Is there someplace online I can check for Tektronix service bulletins? The filament voltage was fixed by Tek mod # M50226 but I only found out (too late) by Googling "Tektronix 2213" dim

Oh, and I've got a $41 bid on a 422 that comes up in 3 days.

Alan AB1JX


Re: 2235 with 360 kHz 100mV P-P ringing on +100V PSU rail

Vaugha Brewchuk
 

Thank you Ed! I will have a look at the restorer circuit. I also read message 62540, but my scope does not have a fan. I was thinking of installing one, but now I am having second thoughts.

Vaugha.

--- In TekScopes@..., "Ed Breya" <edbreya@...> wrote:

Try adding small resistors in series with the rectifiers for damping the current pulses to the restorer circuits - if they don't already have some circuit resistance that would do that anyway. Look at the circuit and see if there can be any large, sharp-edged charging currents for caps. If you soften the edges too much, you may affect the z-axis response, causing different display problems.

Also, look at message number 62540 regarding the fan circuit being half-wave rectified.

Ed


--- In TekScopes@..., "vaugha69" <vaugha_brewchuk@> wrote:

I am now definitely convinced that I am OCD...

I purchased another very inexpensive Mil 2235 "for parts", and it appears to be mostly functional. I also found an old Hammond isolation transformer that I need to re-wire to provide proper grounding (it's quite old with an ungrounded plug). When I have some time I will do a bit more experimenting to see if I can somehow reduce the ringing. I understand that it will likely make no difference in the display noise/ripple, but I'm looking at is as an interesting project.

The fact that the ringing is present only every second ripple makes me believe that it could be induced by the DC restorer circuitry, as Ed suggested below. Perhaps installing ultra fast, soft recovery diodes in the DC restorer circuit could clean it up a bit?

Vaugha.

--- In TekScopes@..., "Tom Miller" <tmiller@> wrote:

Hi all,

I opened up my 2215 and got on each end of CR-961, the same point as the
2235 we have been looking at in other pictures. I have attached a picture
of what is on each end of that diode. Test scope is a 475.

The top trace is ch-2, 50 V/Div, x10 probe, DCcoupled, 10 uS/Div, chop mode sync on ch 2.
The bottom trace (ch-1) is the anode of CR-961, the 100 Vdc supply. 5 mV/Div
AC coupled x1 probe.

The grounds were to the case. I did not see much noise on the negative side
of the filter cap C-961.

I can see the effect on the 2215 on the 2 mV input if it is ungrounded but without
a probe. I don't think that is related to what we are seeing on the 100 volt line. I
would be more inclined to believe it is just noise around the channel 1 input circuit.

I'll play a bit more later today.


Thanks guys, very interesting (and somewhat obscure) subject.

Tom M

----- Original Message -----
From: Ed Breya
To: TekScopes@...
Sent: Wednesday, May 25, 2011 2:08 PM
Subject: [TekScopes] Re: 2235 with 360 kHz 100mV P-P ringing on +100V PSU rail



This has been a very busy thread, so I got curious and had to look through it a bit. You have received many good suggestions and clues, so maybe I can summarize it with my one-cents' worth.

1. I believe the ringing on alternate ripple cycles of the +100V is due to an asymmetry of damping, probably due to the feed to the DC restorer circuitry from one end of the winding, or maybe a replica from the HV multiplier winding. A component failure would likely cause a much more dramatic effect.

2. Adding snubbers is generally the easiest way reduce the ringing, presuming the proper high speed rectifiers are used (and each pair are same type). For common-mode ringing on cables and lines (even probe leads), lossy ferrite "prayer beads" can help.

3. Eliminating that ringing should clean things up a bit, but probably won't make much difference in the displayed noise. The observations that the 2200 series scopes have this tendency is true as far as I know, and in my experience.

4. Message number 62109 is exactly right in explaining the come-and-go effect. The "noise" is constant, either apparent as trace thickness, or observable when the beat frequency is right.

5. Some amount of converter ripple is present on every supply, and ripple current circulates throughout the entire scope structure - even out through the probe leads. It's just a question of how much, and where does it cause problems. The CRT anode lead and face will have the highest electric field, while the power supply zone and heaviest loads will tend to have the highest magnetic fields.

Most scope vertical amplifier circuitry is differential, and tends to have very good CMR at the ripple frequencies. The most susceptible part is the front-end, where the smallest version of the desired signal exists in single-ended form, to be amplified and converted to differential form. There, the shielding protects it from electric fields, while the grounding system and signal path control protect from currents.

If setting the input to ground eliminates the "noise," then that tells you a lot about the source. If you trigger externally from the supply, you will probably still be able to see some even then. You can experiment and add improvements to make it better, but with diminishing returns - again it's a question of how much better do you want it to be, compared to "normal" performance.

Ed

--- In TekScopes@..., "Jon" <jonathan_harrison@> wrote: