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Hi, everybody.

The formerly dead 7603 saga continues. The white connector where the
Right Vertical plug-in connects snapped apart last night. It's such a
clean break off the left side (looking into the scope) that it seems
like a bit of epoxy could hold it back on there good as new. Any reason
to avoid doing so?

I'd attach a picture, but how do I do so?

Thanks for your help.

Jim

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This email has been checked for viruses by AVG.

When my cohort gets out of the hospital, he has a 7613 in the basket for sure. The wrong person worked on the power supply and I couldn't get it going again. Storage also quit on it before that.

We also have some plugins, so it is ripe to try and build a set of extenders for it since they don't seem to readily available. That part of the scope will come apart for that.

Problem is he had open heart surgery and has no idea when they're going to cut him loose, or what kind of shape he'll be in. You might end up epoxying it first.

And to comment on that, there is no harm in trying, it is broke anyway. I would also consider using zip ties to clamp it together. I don't believe it broke due to force, it is only an edge connector. The plastic is probably brittle from outgassing for 40 years or whatever.

Keep us posted on if it works, if not I'll see what I can do. At least he lived...

Thanks, Jeff.
I'll try the epoxy, while being careful not to put too much on there and block anything.
Weekend project as I had to leave early from work and couldn't get the scrap HP 54504A DSO out of the building yet.? Monday for sure.
Jim


Sent from my Verizon, Samsung Galaxy smartphone

Jim,

I used 'J-B WELD Original' works quite well. Never had much luck with epoxy.
Mix it thoroughly and wait a little to firm up before using.

Dallas

Good day, ?
may I second Dallas‘ advice. JB Weld has worked well for repairs of 5000-series front panel bezels, also.?JB Weld was hard to get in Europe, but it is available from Conrad.de and other sources for some time now...
Cheers,
Magnus

Jim,

I used 'J-B WELD Original' works quite well. Never had much luck with epoxy.
Mix it thoroughly and wait a little to firm up before using.

Dallas

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I third the JB Weld. That stuff could hold the space shuttle together.

I don't believe it is nylon, nylon is a problem. You can like..."cement" it, but finding something that really makes a bond is easier said than done.

I had to laugh, that is so true!





I third the JB Weld. That stuff could hold the space shuttle together.

Hi Jim,

I scrapped a couple of 7603s a while ago and still have the rear interface panels (with connectors), which you’re welcome to. I’m in Scotland, where are you?

Cheers,
Mel

--
you can never have enough oscilloscopes, DMMs, valve testers or soldering irons . . .

Hi, Mel (and Dallas, Jeff, and Magnus who turned me on to JB Weld -
thanks, guys!).

While I would like to say that JB Weld saved the day, that's not quite
true.

I glued the piece back on with JB Weld, but now it's really hard to get
a plug-in in and out of the center slot (right vertical), and even
worse, the 7A26 and 7A22 plug-ins I tried don't quite work properly. In
hindsight (as always 20-20 vision), I should have stuck in a piece of
1/16 inch epoxy glass board to position the broken piece properly.
D-oh! I keep a piece of such board handy, as it protects my anti-static
mat while soldering.

So I tried sanding down the JB Weld, and it helped a bit. Also sanded
the insides on the top and bottom a bit, because the reattached piece
kind of bows so the gap between it and the piece on the other side is
greatest in the middle and least at the top and bottom. I suspect this
is why the plug-ins don't work completely. Probably the reattached
piece is pushing the plug-in contacts to the right, away from the mating
contacts on the interface panel.

I could show a photo, but I don't know how to do so. Attaching to the
email doesn't work. Thanks in advance for educating me on that.

Mel, I'm in USA, so I'd imagine shipping from Scotland would be high,
maybe even more than the $233 (wow, that's a shocker - I bought my 7904
with 7A26 and 7B85 for $100 a few years ago!) for the lowest priced 7603
on eBay that's not a Parts Only unit. Although I'd appreciate it if you
would check shipping to Laguna Hills, California, USA 92653. Thanks for
the offer!

Jim

Hi Mel,
I tried sending an email to your personal account, but it bounced... Here is what I wrote:

"Hi Mel,
You might have seen my post on Tekscopes about refurbishing/repairing a 7000-series rigid extender that I sent a short while ago. I was wondering if the 7603 backplane connectors are similar to, or even identical to, the edge connectors of the rigid extender? If there is a possibility of this and since you live in Scotland, it would be pretty painless to post one to me. There look to be two types of edge-connectors in the 7603: 204-0365-00 and 201-0365-02. Is there much difference between them? The corresponding edge-connector for the rigid extender (Tek 067-0589-00) has the P/N 204-0365-01, so there might well be compatibility here.
If there is some possibility to repair my rigid extender and you would be prepared to send one of these edge-connectors to me, what would you want me to pay for it (including postage)? I live in London SW19 8ER.
TIA, Colin."

On 08/27/2018 09:38 AM, Colin Herbert via Groups.Io wrote:

I was wondering if the 7603 backplane connectors are similar to, or even identical to, the edge connectors of the rigid extender?

Yes, that will work if they have the same pcb mounting shapes, distances as the rigid extender. Photos might help.

Hi John,
I don't have a 7603 to photograph, but I have looked up the part-numbers for both the edge-connectors on the 7603 (as I said, there are two types) and the rigid extender and there seem to be three part-numbers which only differ in the last two numbers, so I suppose they are compatible to a great extent.
Colin.

Hi Jim,

I have a couple of plugin interface cards, but the cheapest thing would probably be to desolder a couple of connectors and pop them in a padded bag to you. Give me a day or two and I’ll get them removed and a carriage cost for you.

Cheers,
Mel
--
you can never have enough oscilloscopes, DMMs, valve testers or soldering irons . . .

Hi Colin,

Yes, I can send you a connector too, once i’ve removed them. I’ll need to have a look at my extender, but think that, although the connector is the same, the actual connecting pins might be longer on the extender than the interface panel. Still, a bit of work with some link wire and a soldering iron should sort that! Not sure why your message to me should have bounced - does anyone else have any ideas on that?

Cheers,
Mel

--
you can never have enough oscilloscopes, DMMs, valve testers or soldering irons . . .

Sounds good.
Thanks for the help.
Jim


Sent from my Verizon, Samsung Galaxy smartphone

Hi again Colin,

The two different part numbers refer to either the right-hand (timebase) slot or the two left-hand (vertical amps) slots, with the LH connectors having four of the connections shortened to allow connection to a smal PCB which connects the two LH slots together. I haven't found out what this does, but it would seem that the RH slot connector would be better for you, as all of the connections are present on it. Now, as there is only one of this type of connector per 7603, i only have two of these connectors. As I've already promised one to Jim, that leaves me with one I can send to you. Is that OK?

Cheers,
Mel

--
you can never have enough oscilloscopes, DMMs, valve testers or soldering irons . . .

Hi Mel,
That sounds ok to me. I should probably tell you that according to both the Tek extenders and John Griessen's version, positions A36, B36, A34, B34, A28 and B28 have no connections. Is that anything to do with the small PCB?
Regards, Colin.

Hi Colin,

No, the pins connected to the small PCB are A11, B11, A12 and B12. The other pins that you note are actually unpopulated with connections. I have both of the connectors desoldered now, so I'll get one off to you tomorrow. I'll tell you how much the post is and you can give me whatever you think is reasonable for the connector.

Cheers,
Mel

--
you can never have enough oscilloscopes, DMMs, valve testers or soldering irons . . .

Hi Colin,

Can you give me your house number - know the rest of your address!

Cheers,
Mel


--
you can never have enough oscilloscopes, DMMs, valve testers or soldering irons . . .

Hi Mel,
My address is:
Colin Herbert
30 Brooklands Avenue
Wimbledon Park
London SW19 8ER

Colin.