Date   

Re: Wanted: 5000 series extender(s)

Dave Peterson
 

Magnus, thank you for your comments.

Your craftsmanship is quite nice. I like how you've created a built-in tester with the extender. A much more robust and safe build. I think I prefer your extender over Tektronix's!

Perhaps a future project for me to undertake.

Dave


Re: 7704A Vertical Amplifier Issues

Mark Vincent
 

Barry,

You can test from the two bases of the outputs to the collectors. That may indicate the output IC is bad. Q4420 is a 2N3906 and CR4419 is a 1N4152. A 2N2222A and 1N4148 or 1N4937 will work as subs for these two. At the emitter of Q4420 should be 15,6V. The 33 and 5600 ohm resistors should be 1W. The bias voltage at R4416 should be 10,1V. The output pins should be 36V and 37V when working. Since the 33 ohm resistor burned, it is likely the IC is bad. If the 50V supply went too high, that will short the output IC. There is a seller on "that site" that has some known working boards from this model. Ask if he has the vertical output board. There is a NOS IC on there also. See if the voltages at the pins are correct. These can be done at ends of resistors. The four 200 ohm resistors should have 9,3V at the IC. Voltages that are way off, will also mean the IC is bad. It looks like the parts you ordered made the power supply work.

Mark


Re: Recreating an old board for the 7854

Harvey White
 

That's a very large board.  Had you considered a smaller board with some 3D printed rails?, or two boards with an IDC jumper? I've used that approach.

Harvey

On 9/21/2021 11:19 PM, Zentronics42@gmail.com wrote:
Assembly is not to complicated now that I am prototyping in the real world not just digital I need to check the physical dimensions make sure everything lines up. I used a mix of THT and SMD everything is in current production that Is needed so it should not be too hard to source parts. All SMD parts are 1206 to aid in a stress free assembly. I will have to outsource the board as I am not able to may anything at home Larger thank 8 1/2 X 11 that board is around 15 inches long so it is rather large.

Zen

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of demianm_1 via groups.io
Sent: Tuesday, September 21, 2021 9:07 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Recreating an old board for the 7854

I have 3 7854's so a valid interest. How involved is the assembly?











Re: Recreating an old board for the 7854

Zentronics42@...
 

Assembly is not to complicated now that I am prototyping in the real world not just digital I need to check the physical dimensions make sure everything lines up. I used a mix of THT and SMD everything is in current production that Is needed so it should not be too hard to source parts. All SMD parts are 1206 to aid in a stress free assembly. I will have to outsource the board as I am not able to may anything at home Larger thank 8 1/2 X 11 that board is around 15 inches long so it is rather large.

Zen

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of demianm_1 via groups.io
Sent: Tuesday, September 21, 2021 9:07 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Recreating an old board for the 7854

I have 3 7854's so a valid interest. How involved is the assembly?


7704A Vertical Amplifier Issues

n4buq
 

A few weeks ago, I posted a message regarding something that overheated from in/around the Vertical Amplifier board in my 7704A. Night before last, I was trying to determine what might be causing the traces to occupy only about 1/10 of the vertical space on the CRT and the vertical position has very little effect. I thought that the two connections to the vertical plates might be touching something between the vertical amplifier board and where they plug in to the pins on the CRT neck. When I powered it back on, I noticed smoke again and observed that R4419 was the culprit.

In my previous post, I noted that there appeared to be a "flying wire" mod on the vertical amplifier board but after noticing which component was overheating, I investigated the schematic and found R4419 is part of what appears to be a factory upgrade to include Q4420 and its supporting components. I also discovered that Q4420 is fully open so I plan to rebuild that entire circuit as the one I have isn't done as neatly as I've seen other examples.

One of the components is CR4419 which was originally a 2N4152 and I'm not finding much in the way of cross-references for that. I think the original part is still good but has fairly short leads and I would like to have a diode with longer leads to work with. Does anyone know of a good sub? I have 1N400x and 1N5819. Would either of those be suitable? I prefer the 1N5819 due to the slightly smaller package but should be able to work with either one.

Also, from what I've seen, the problem with my vertical amplifier may be U4413. I'm holding out hope it isn't that but I have a bad feeling that it is.

Thanks,
Barry - N4BUQ


Re: Recreating an old board for the 7854

demianm_1
 

I have 3 7854's so a valid interest. How involved is the assembly?


Re: 2445B tick mode issue -- fixed (inverter and regulator board recap and repair)

Keith
 

Thanks Marcel!

I appreciate the video and the BOM file. I have a 2445b that is working fine, but I dread the day that the SMPS ever goes dead, as I know so little about them. Now, having your video and BOM provides me with a measure of peace of mind. Thanks again for your extra work to do these postings.

Keith
CoolBlueGlow


Re: Recreating an old board for the 7854

Zentronics42@...
 

Yep those sorry about the typo. The board only needs 1 cable. But it needs 5 connectors. It allows for some signal termination to cables that exist in the scope already. I have some of the micro coax lines from some scopes that had terminal issues. The pre-trigger signal gets a cable it is BNC input micro coax out to 7854. J610 is the pretrigger out. J805, J900, J1600, J1500 are the terminators for the lines already in the scope. J805 and J900 are actually mounted on the back of the board.

Zen

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of redarlington
Sent: Tuesday, September 21, 2021 4:03 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Recreating an old board for the 7854

https://w140.com/tekwiki/images/thumb/6/6b/Peltola-connector-socket.jpg/640px-Peltola-connector-socket.jpg

Those guys? Peltola?

Can you tell us how these are used with the board? Are you planning on
providing cable assemblies along with them? or just need the socket on the
board to use with existing cables in the 7854? Am I completely wrong
with this connector and it really is a Penolta?

Thanks,
Bob - N3XKB

On Tue, Sep 21, 2021 at 1:56 PM <Zentronics42@gmail.com> wrote:

As the board is moving in to real world resting there are 2 issues, I
need to make people aware of.
I do not have a price per board yet but these boards are NOT small so
I am expecting them to be on the high side.
Also there is a Tek specific connector that is used. They are called
penotla connectors and the board needs 5 each. I have a source for the
pins but I need the outer barrels to complete the connectors. I can
get some of the supplies I need if any one has any junk boards laying
around that I can pull them off of. Parts scopes in the 4xx 5xxx and
7xxx are all useful for this case.
This will ultimately be the limiting factor of how may boards I can make.
I currently only have enough parts to make 8 complete connectors. I
have a TON of pins. Not may barrels.

Zen


Tektronix 5A20N differential amplifier plug-in repair

magnustoelle
 

Good Day to the group,

I have just completed a simple repair of a type 5A20N differential amplifier plug-in for the 5000/5400 series of Tektronix oscilloscopes. There is not much to "write home about" this, but I thought I share my joy with you...

*Problem containment:* The input signal present at either the positive or negative input was not displayed properly. The trace was heavily distorted and shifted grossly over the whole screen when rotating the VOLTS/DIV deflection factor settings.
*Troubleshooting and repair:* Using my DIY-made extender, all supplies and the push-pull output stage composed of Q163/Q263 were measured with a DMM and found nominal. Injection of an external small signal into Q129A/B of the input stage resulted in a reasonable display. Both input protection fuses were found open and were replaced. A dual N-channel JFET Q120A/B (Tektronix part # 151-1049-00) in the input stage was found "toast".
As several other group member have already discussed, this is a hard-to-obtain transistor pair. So, I have used my 5CT1N curve tracer to match two standard "dirt cheap" Fairchild BF245A JFETs from my local stock. I have sanded the flat side of the package and super-glued the two units together. I was pleased to find that with this replacement the plug-in was fully restored.
*Conclusion:* A massive electrical over-load event has taken the N-channel JFET and both fuses at the input stage out.

A full calibration was completed after the repair.

I have uploaded a few pictures to https://groups.io/g/TekScopes/album?id=268328

Cheers,

Magnus


3 photos uploaded #photo-notice

TekScopes@groups.io Notification <noreply@...>
 

The following photos have been uploaded to the Tektronix 5A20N repair and calibration album of the TekScopes@groups.io group.

By: magnustoelle <magnustoelle@...>


Re: Recreating an old board for the 7854

redarlington
 

https://w140.com/tekwiki/images/thumb/6/6b/Peltola-connector-socket.jpg/640px-Peltola-connector-socket.jpg

Those guys? Peltola?

Can you tell us how these are used with the board? Are you planning on
providing cable assemblies along with them? or just need the socket on the
board to use with existing cables in the 7854? Am I completely wrong
with this connector and it really is a Penolta?

Thanks,
Bob - N3XKB

On Tue, Sep 21, 2021 at 1:56 PM <Zentronics42@gmail.com> wrote:

As the board is moving in to real world resting there are 2 issues, I need
to make people aware of.
I do not have a price per board yet but these boards are NOT small so I am
expecting them to be on the high side.
Also there is a Tek specific connector that is used. They are called
penotla connectors and the board needs 5 each. I have a source for the pins
but I need the outer barrels to complete the connectors. I can get some of
the supplies I need if any one has any junk boards laying around that I can
pull them off of. Parts scopes in the 4xx 5xxx and 7xxx are all useful for
this case.
This will ultimately be the limiting factor of how may boards I can make.
I currently only have enough parts to make 8 complete connectors. I have a
TON of pins. Not may barrels.

Zen


Re: 103-0165-00 for 7S14

Miguel Work
 

Hi, thanks, yes is 351-0217-00, I looked in the wrong page


Re: Recreating an old board for the 7854

Zentronics42@...
 

As the board is moving in to real world resting there are 2 issues, I need to make people aware of.
I do not have a price per board yet but these boards are NOT small so I am expecting them to be on the high side.
Also there is a Tek specific connector that is used. They are called penotla connectors and the board needs 5 each. I have a source for the pins but I need the outer barrels to complete the connectors. I can get some of the supplies I need if any one has any junk boards laying around that I can pull them off of. Parts scopes in the 4xx 5xxx and 7xxx are all useful for this case.
This will ultimately be the limiting factor of how may boards I can make. I currently only have enough parts to make 8 complete connectors. I have a TON of pins. Not may barrels.

Zen

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of ciclista41 via groups.io
Sent: Tuesday, September 21, 2021 3:27 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Recreating an old board for the 7854

On Mon, Sep 20, 2021 at 06:54 PM, <Zentronics42@gmail.com> wrote:


Helping out with the footprint was a huge help. My next step will be
printing out a paper copy of the board and testing fitment in to the
frame to check the connectors and physical dimensions. Then I will be on to working up a BOM.
There has been interest in the board here so I do plan on releasing it
once it has been tested and I have calibrated a scope with it. I am
just hoping parts availability will not kill me on this one. Need to get the chips ordered.

Zen
I own a 7854, and am therefore interested, as well!


Re: Recreating an old board for the 7854

ciclista41@...
 

On Mon, Sep 20, 2021 at 06:54 PM, <Zentronics42@gmail.com> wrote:


Helping out with the footprint was a huge help. My next step will be printing
out a paper copy of the board and testing fitment in to the frame to check the
connectors and physical dimensions. Then I will be on to working up a BOM.
There has been interest in the board here so I do plan on releasing it once it
has been tested and I have calibrated a scope with it. I am just hoping parts
availability will not kill me on this one. Need to get the chips ordered.

Zen
I own a 7854, and am therefore interested, as well!


Re: Tek 7603 missing readout but present when beam finder pressed

Roger Evans
 

Roy,

That looks all OK apart from the readout positioning. You should be able to adjust R2291 and bring the readouts back to their proper position.

Roger


Re: Tek 7603 missing readout but present when beam finder pressed

Roy Kalawsky
 

Hi Roger

Thank you coming back to me on this.
1. Removing both plugins produces a perfectly centred horizontal line.

2. Replacing both plugins and positioning channel 1 snd 2 as you suggest and then pressing beam finder produces a compressed display with the upper read out line above the upper line snd the lower readout line below the lower line.

3. When inputting a square wave and moving this up snd down the display there is no change in amplitude.

Cheers Roy


Re: TEK 547 no trace

Albert Otten
 

I tried the XY mode,Horizontal mode in EXT.
It takes some time for me getting used to the 547
Still no trace.
Then I tried a 1A4 module I have very recently obtained from Austria. in
stead of the 1A1 was in the 547 bay.
Now it works,all 4 channels! I tested it still only for a view minutes.
That's an unexpected good find Rob.
I still don't see how a 1A1 fault can cause a trace shift to the right, but perhaps I read your description "After about a minute the trace slowly disappeared from left to right." wrong. You could also mean that the intensity drops from left to right? You checked all LVs and HV were good. There might be an issue with plugin connector pin 15 or with switch S675 (see diagram <1>). or with an open filament in a plugin tube. Those filaments are in series with amplifier tube V1003 and with the Miller runup tube V91(!).
I now need to whats wrong with the 1A1
I still have a 1A1 I bought from,or was given by Albert Otten around may 2017
!!! I checked my email !!. What a coincidence.
I am not sure if I changed the 1A1's around.One has switches on the input
BNC's
Yes, you are right! Your memory is better than mine. The one with the AC-GND-DC switch concentric with the input BNC was an untested scrap unit. The other one a tested nuvistor type with S/N 701433. You wrote that the latter unit passed a short basic test in your 535, so if you still have that unit you could try it in your 547.

Albert


Re: 103-0165-00 for 7S14

 

On Tue, Sep 21, 2021 at 12:11 PM, Miguel Work wrote:


I´m searching for "103-0165-00" part
Are you sure about the P/N ?

I suspect you mean #85 on Exploded Fig 1 but got the P/N from the Fig 2 list.
If so the correct P/N is 351-0217-00 which was used in 7A42, 7D01, 7D02, 7L5, 7S12 and 7S14
For replacement 386-5467-00 should be used.

/Håkan


Re: Wanted: 5000 series extender(s)

magnustoelle
 

Good Day David,

thank you for sharing your photos and for your write-up.

It is surely great to see another DIY-built extender for the Tektronix 5000/5400-series of oscilloscopes. I agree that the standard JAMMA boards are low-quality, but at least they are available for us hobbyists and they "do the job" as you said.

I also like your "minimalist" design spirit - I have slightly over-done it when I have designed and built mine 11 years ago - https://groups.io/g/TekScopes/files/Test%20adapter%20for%205400%205100.pdf
On the mechanical holder, the idea to use the top & bottom frames and the side panels from another, defect plug-in may probably inspire you.

Secondly, I have never seen a D10/5110 with an (optional) P11 phosphor CRT; very nice!

I hope your extender will give you many years of good service - enjoy. I had to use mine for my recent repair of a 5A20N plug-in. A brief write-up of that to follow soon...

Cheers,

Magnus


Another update:

See: https://groups.io/g/TekScopes/album?id=268247 for one JAMMA harness
successfully converted to a 5110 extender. Pardon if my references aren't
conventional. The 5000s have quite a diversity of nomenclature. I'm still
not quite sure I'm making proper references to the equipment intended. But
I think 5110 is the appropriate name for early 5000 series scopes. These
extenders should work for all early 5000 scopes.

As you can see I was
able to use a Dremel cutting wheel to open the common traces connecting
locations 1&2 and 3&4. I just very carefully and gently let it grind off
the trace. Using an Exacto knife to score a straight line helped a lot. I
then used a 5110 plug-in card edge to match the key slots in location,
dimensions, and shape with the same Dremel tool.

The experience of
disassembly of the JAMMA harness was revealing. The quality of materials
is not good. In separating intentionally soldered together connector pins
I managed to just about completely melt the plastic socket of one pin. I
was able to use some epoxy to get it remounted. Fortunately that location
is also a NC for the 5110. But the materials and construction are as
minimal as can be. I can't complain as I'm buying the cheapest parts I
could find. But good to be aware of how bad bad can be. From now on I'll
be much more careful with the heat. I was afraid of using the heat gun on
the heat shrink. But I manage to not turn it into a molten blob.

The
wires were decent enough. The general wiring is 24 gauge, and there were
three 20 gauge wires. I used the large wires for the +/-30v and ground.

After assembly and some basic continuity verification, I plugged the
extender into each slot of a 5103N and verified first that the ground
locations were all grounding to the chassis. They were. I then powered it
up sans plug-ins and verified that the expected source voltages were
present for each slot. Finally I verified that both vertical and
horizontal plug-ins work in their entirety when connected with the
extender. No magic smoke was released, no bad smells, melting wires,
sparks, nor shocks. So I consider that a success.

I need to passivate the
card edge connector, and provide some means of physically gripping it. I'm
thinking hot-glue-gun ridges running the length of the card edge. For now
I have to be very careful in insertion and removal. Certainly not a
production nor idiot proof component at this time. But it is an order of
magnitude more affordable than what I'm finding on the market so far. And
needing two, that's a decent scope's worth of money.

I'll also say I'm
pretty darn happy with the result. For as cheap as the original materials
are, once assembled the card edge and connector have good fit and
reasonable insertion and removal forces. I'll have to see about procuring
or constructing some keys for the connector, but for occasional and
careful use these are going to work just fine.






Re: For Aussies: TEK 7603/R7603 manual available

VK1GVC
 

The manual has been taken - Simon in Melbourne will be the new owner.

Graham

On 21/09/2021 11:54 pm, VK1GVC wrote:
I have recently saved a TEK 7603/R7603 service manual 070-1429-00 from disposal as I'm sure that there must be someone out there who needs it.  No charge except to cover postage costs.

I'll offer it first to any Australian TekScopes group members as it's easier and cheaper to post within the country.  If no takers here then I'll throw it open to anyone interested.

The manual as printed is the October 1985 revision but it has the pages for manual change dated 3/17/86, or 17 March 86 as we Aussies would say.

Please send all responses direct to vk1gvc (at) iinet dot net dot au and _not via the group_.

Regards to all,

Graham
Canberra, Australia



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