Author Topic: Test Equipment Anonymous (TEA) group therapy thread  (Read 1720957 times)

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Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #16875 on: September 25, 2018, 11:11:13 am »
I didn't get my knobs this morning as planned, the printer said that he was going to be very busy today, in and out a lot that he would also kindly deliver them for me as I was local and that he would happen around 1pm today so not long to wait. He has also given me his direct email address so if anyone else wanted to make use of his services, we could contact him directly and not have to go through the agency and hence get a discount, if the quality is OK.

So once I have the knobs and if I'm happy with them, I'll post his email address up along with photos of the printed knobs and then if anyone who requires something printing could contact him directly.
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Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #16876 on: September 25, 2018, 11:23:19 am »
Cool stuff. Pretty high demand for them. Order a load and sell 'em on ebay :)

BTW 7L12 diagnostics: -15V rail is short. +5V lights rail is short. Fix that, should at least be safe to plug it in.
 

Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #16877 on: September 25, 2018, 11:40:25 am »
That thought had crossed my mind, giving it a thought. Hopefully it will just shorted tants and then the moment of truth will it or wont it?
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Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #16878 on: September 25, 2018, 01:05:09 pm »
Well this one is definitely being difficult :)

Have managed to isolate it to the IF board. Fortunately the -15V comes into a distribution and filtering board and then off via jumpers to other boards. Moment you put the IF board back in it drops. There was a short on the 2nd LO board as well so haver replaced them. Getting there! There is still hope left.

I will say that this is the most complicated bit of electronics I have ever seen. Much  :-/O :scared: :phew: :-BROKE
 

Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #16879 on: September 25, 2018, 01:16:40 pm »
Slowly slowly catchy monkey, you'll win I know it, especially if you show those remaining tants what's in store if the misbehave by way making examples out of the others with a club hammer  :-DD :-DD

In other news:-
Knobs have arrived look OK, have a slight texture to them, had a go over with a piece if fine wet and dry. Also they are loose on the shafts but is easily fixed with a small square of sellotape pushed onto the end of the shaft before pressing the knob on.

Colour is never going to a perfect match but I think this colour is as near as my print depot could get and it's called light stone. No doubt once its been used a few times it will begin to get a bit darker with finger grease etc.

Just noticed that there is a slight colour variation on the other knobs anyway.

EDIT:
For anyone interested in getting some 3D printing done here is the address of the printer direct as promised Print3d@techie.com and this is more suitable to people in the South East of the UK but postage would not be a problem but I could imagine that long distance printing / communication / checking samples could get a bit fraught with distance but its your choice if you don't either have a 3d printer or know anyone willing to do some for you.


« Last Edit: September 25, 2018, 03:23:40 pm by Specmaster »
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Offline xrunner

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #16880 on: September 25, 2018, 01:46:24 pm »
Get a small file and file the four slots on the side of the knob around the corner like the others it'll look even better.
I am a Test Equipment Addict (TEA) - by virtue of this forum signature, I have now faced my addiction
 

Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #16881 on: September 25, 2018, 01:49:39 pm »
I did think about this but as the walls are not particularly thick decided to leave well alone for fear of making it weaker or worse still making holes in it.
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Offline med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #16882 on: September 25, 2018, 02:21:52 pm »
Working on the RCA scope. Things are not going too well.

Here's the power supply board re-capped and installed.



Results? Not so great. No horizontal sweep, which I had before. But the trace is no longer thick and out of focus so some progress there. Did some quick voltage measurements and from what I can tell all is OK. Checked the horizontal output transistors and they are sitting at +126VDC which seems right. Apparently I have to go back and check my interconnects again from the supply board. I'm overlooking something. But not this morning...gotta get some shut eye.

An old gray beard with an attitude.
 
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Online mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #16883 on: September 25, 2018, 02:39:33 pm »
Some quick porns. Will reply to other threads later. Major busy today  :--

Excellent packaging. Literally the best I've ever seen. Double wall box. Totally rigid packed and wrapped with cut outs for fragile controls  :-+
(SNIP)

(SNIP)
Too busy to stuff it in the mainframe at the moment. Unfortunately however it appears to be full of tantalum shaped wankers so I'll probably have to dig around in there before I fire it up and check for shorts. Some of them result in toasty resistors which is bad for the general health of the unit.

Edit: couldn't resist. Took covers off sides. There isn't a square cm in that which hasn't got something crammed in it.  :scared:

Lead on, MacDuff! ;)

*Sipping coffee*

I SO want to work for a company called "NapTech." I think I'm going to go practice "R&D" for them right now...   :-DD

Ok taken some time out to look at it. Literally the first tant I hit on the second mixer was short. This is going to be a long one.

https://youtu.be/3qYbVQu7YAQ


Slowly slowly catchy monkey, you'll win I know it, especially if you show those remaining tants what's in store if the misbehave by way making examples out of the others with a club hammer  :-DD :-DD

   In other news:-

Knobs have arrived look OK, have a slight texture to them, had a go over with a piece if fine wet and dry. Also they are loose on the shafts but is easily fixed with a small square of sellotape pushed onto the end of the shaft before pressing the knob on.

Colour is never going to a perfect match but I think this colour is as near as my print depot could get and it's called light stone. No doubt once its been used a few times it will begin to get a bit darker with finger grease etc.

Just noticed that there is a slight colour variation on the other knobs anyway.

Careful with the sanding... typical is 0.5-0.8mm outer wall thickness.

Now you see why I wanted to know which knob hole was closest to what you need.  (Jeezus; that sentence just sounds FILTHY)  :-DD

mnem
*Makes mental note to develop "Decades of Fade and Grime Boatanchor Knob" colored filament and make killing on Shapeways*   
 

Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #16884 on: September 25, 2018, 02:47:21 pm »
Oh, I see, I thought you wanted which knob was the closest to the original because you did the 2 sizes that this scope has. It turns out that almost if not all the TDS range uses the same knobs albeit I think the later models had 6 flutes instead of the 4 on the smaller of the knobs.

I only did a very light sanding because of the wall thickness was not going to be that great so careful examination of the knob will reveal that it is a printed one even now after sanding but it has removed the worst after effects so it feels the same when you touch it.  :-DD
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Online mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #16885 on: September 25, 2018, 02:55:15 pm »
As long as touching doesn't devolve into fondling, I think you'll be okay.  :-DD

You DID say you were going to have to let this one go... ;)


mnem
"One can get too familiar with vegetables, you know!" ~ Chef Skinner
« Last Edit: September 25, 2018, 03:28:11 pm by mnementh »
 

Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #16886 on: September 25, 2018, 03:03:09 pm »
Arh yes, Ratatouille, a great cartoon film that one. I quite enjoy films of that nature, my family I'm daft as they are kids films but I can see beyond that and appreciate the craft that has gone into the making of them.
« Last Edit: September 25, 2018, 03:11:06 pm by Specmaster »
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Online mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #16887 on: September 25, 2018, 03:27:42 pm »
In all honesty, with the vast wasteland that "Mainstream TV & Movies" has become; willfully pandering to and driving lower and lower the lowest common denominator, the last refuge for the truly creative has become children's programming.

The popularity of specialty segments like Adult Swim and Curiosity Stream are proof that adults still enjoy content that makes them think, FOX network and the peurilization of Public Broadcasting be damned. ;)

 They've learned that they CAN make content that actually appeals to both kids and adults, and more importantly, that content SELLS.

mnem
*Desperately seeking a hard-to-find part for his AC that SHOULD NOT be so hard to find*
 

Offline Cerebus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #16888 on: September 25, 2018, 03:56:23 pm »
Ok taken some time out to look at it. Literally the first tant I hit on the second mixer was short. This is going to be a long one.

Especially with all that rigid/semi-rigid coax to crawl around. Good luck, something tells me you're going to need it.
Anybody got a syringe I can use to squeeze the magic smoke back into this?
 

Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #16889 on: September 25, 2018, 04:43:46 pm »
Ok taken some time out to look at it. Literally the first tant I hit on the second mixer was short. This is going to be a long one.

Especially with all that rigid/semi-rigid coax to crawl around. Good luck, something tells me you're going to need it.

Fortunately the rigid coax end is ok. I traced the short to the board I have excavated but I can't find the damn thing. There was a wet tant that was short. Fixed that. I've pulled every socketed semiconductor out and tested for shorts. All the remaining tants are fine. this is NOT fun  :-DD

3 hours in ...



To confirm, if I yank out the supply cable loom for that board it comes up and sweeps and shows noise. Yig isn't running, neither is the IF strip though.

Edit: also I found tin whiskers in one of the RF cans. These should clear with a few tens of mA though so it isn't that.
« Last Edit: September 25, 2018, 04:46:23 pm by bd139 »
 

Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #16890 on: September 25, 2018, 04:52:47 pm »
There sure is a lot going on. on that small bench, mind the 867 doesn't get knocked off the end  :-+
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Online mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #16891 on: September 25, 2018, 04:52:59 pm »
Mmmmmm.... Tektronix spaghetti in Metcal sauce, with a parts bin garnish and a side of buttered PCB. Yum.

mnem
Maybe I need to go make some lunch...
 
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Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #16892 on: September 25, 2018, 04:54:15 pm »
That's just what I was thinking  :-DD so I'm off to eat.
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Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #16893 on: September 25, 2018, 05:05:43 pm »
Me too!
 

Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #16894 on: September 25, 2018, 05:34:21 pm »
Found the wanker! Was pretending to be a silver mica inside the phase lock search oscillator.
 

Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #16895 on: September 25, 2018, 05:36:06 pm »
Now teach him a lesson!

I think we need a hammer emoji
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Offline Cerebus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #16896 on: September 25, 2018, 05:41:30 pm »
I must have been low on caffeine earlier to have missed this one:

I didn't get my knobs this morning as planned, ...

Oo, er, missus./That's what she said./More tea Vicar?
Anybody got a syringe I can use to squeeze the magic smoke back into this?
 

Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #16897 on: September 25, 2018, 05:44:44 pm »
I must have been low on caffeine earlier to have missed this one:

I didn't get my knobs this morning as planned, ...

Oo, er, missus./That's what she said./More tea Vicar?
I hope she didn't say that cos she's in Madeira with her sis on hols. :-DD
Who let Murphy in?
 

Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #16898 on: September 25, 2018, 05:58:49 pm »
Ooh Madeira. Fancy some cake now.
 

Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #16899 on: September 25, 2018, 06:00:09 pm »
Got some Jaffa Cakes only  :-DD
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