WINNER WINNER, CHICKEN DINNER!
I decided to call it a night at 4am after losing colour across multiple CRT's/Shutters, CRT driver boards and main processor boards.
Came back today, put it together and it works! I must have forgotten something in my bleary eyed, 4am daze, but I can't remember what....
Now to run it through a few SPC self calibration procedures to check it doesn't fail and maybe update the firmware if the later 784D firmware will work. (It'll stay as a 754D for now, but firmware is common depending on board revisions. It's easy to flash and try and flash back if no-go, just time consuming).
Does anyone have an HP 3586 that would be willing to make a simple mechanical measurement for me?
The AF knob on this one was sheared off flush, pallet rash I presume. I was able to replicate the necessary features on a fresh bit of 1/8" brass rod in the machine shop and got the pot working, but I don't know how far the shaft should protrude out past the pot body. The standard shaft length for these size pots is 7/8"...but that seems quite long to me as I look at it.
Does anyone have an HP 3586 that would be willing to make a simple mechanical measurement for me?
The AF knob on this one was sheared off flush, pallet rash I presume. I was able to replicate the necessary features on a fresh bit of 1/8" brass rod in the machine shop and got the pot working, but I don't know how far the shaft should protrude out past the pot body. The standard shaft length for these size pots is 7/8"...but that seems quite long to me as I look at it.I have one at home (i think the A model) and happy to measure but won't get there for 48hrs or so,
Rob
PS: Linux I soon I will be there...
[Richard] from [RM Cybernetics] has purchased a ZhengBang ZB3245TSS [pick and place] machine, and in the process of setting it up, dutifully backed up its software onto a USB stick – as we all ought to.
...
After static and dynamic analysis done by a third party, the malware was confirmed to collect metadata accessible to the machine and send it all to a third-party server. Having contacted ZhengBang about this mishap, they received a letter with assurances that the files were harmless, and a .zip attachment with replacement “clean” files which didn’t fail the antivirus checks.
...
It didn’t end here! After installing the “clean” files, they also ran a few anti-malware tools, and all seemed fine. Then, they plugged the flash drive into another computer again… to encounter even more alerts than before. The malware was equipped with a mechanism to grace every accessible .exe with a copy of itself on sight, infecting even .exe‘s of the anti-malware tools they put on that USB drive...
You're telling me that a Duplex is what we call a twin socket, but unlike our twin sockets which the incoming supply is shared to both outlets via busbars so that means both outlets are connected to the same breaker, that yours are not made with common connections? That is a nasty accident just waiting to happen for sure
Ehhhh... that's a wiring convention over here. Duplex outlets are made so that you can break out the bus connections between the two halves; the intent being that the top outlet can be reserved for a floor lamp across the room to be switched at the doorway. In principle, not a bad idea if done correctly.
This is usually done by breaking only the hot bus bar out in cases where the power comes from the box with the receptacle. A single run of 12/2 to the switch then is all that's required to put the switch in circuit; but it does mean that you have a white wire carrying hot to the switch. Over here convention is to look for a switch whenever you see that; real sticklers (like old man Arcangeli) will tag these white-carrying-hot wires with colored tape or uniquely numbered wiring tags. Another "correct" approach would be to use 12/3 and deadhead the unused neutral wire; I've seen that like 3 times in my entire life.
<SNIP>
You're telling me that a Duplex is what we call a twin socket, but unlike our twin sockets which the incoming supply is shared to both outlets via busbars so that means both outlets are connected to the same breaker, that yours are not made with common connections? That is a nasty accident just waiting to happen for sure
Ehhhh... that's a wiring convention over here. Duplex outlets are made so that you can break out the bus connections between the two halves; the intent being that the top outlet can be reserved for a floor lamp across the room to be switched at the doorway. In principle, not a bad idea if done correctly.
This is usually done by breaking only the hot bus bar out in cases where the power comes from the box with the receptacle. A single run of 12/2 to the switch then is all that's required to put the switch in circuit; but it does mean that you have a white wire carrying hot to the switch. Over here convention is to look for a switch whenever you see that; real sticklers (like old man Arcangeli) will tag these white-carrying-hot wires with colored tape or uniquely numbered wiring tags. Another "correct" approach would be to use 12/3 and deadhead the unused neutral wire; I've seen that like 3 times in my entire life.
<SNIP>
We have proper cable for that. Two phase colours and an earth.
It's amazing what you hear - even when you aren't listening.....
Nevertheless, I just had to know what the scope was - so I tracked down the show and registered for the TV station's online service so I could see the show ... and I was able to get this shot of the scope:Wow cool but... do you mean you PAID to get access to that show just to see the scope ?!
You must be rich !
So what kind of show was it then ?
The kind of show where people have to guess the price of items, and the guy that's closest to the price wins something ??
Or maybe the kind of show where people bring their old stuff and a panel of antique dealers bid on it and the guy makes some money this way ?
Do tell... you wet our appetite now... you can't let us down...
It's amazing what you hear - even when you aren't listening.....
I was up late last night, fettling at my desk with the TV providing some noise. There was some nondescript show on and I ignore these types of show with the appropriate amount of apathy for the "quality" of programming that they offer. Ask me later what the show was about and I would likely respond with "What show?"
However, completely engrossed in what I was poking around, my attention was immediately grabbed by the phrase "1972 Oscilloscope" which clearly penetrated my bubble of indifference to the outside world. I quickly hopped up to see what this device could be only to see it for less than half a second. As I watched, they never went back to it.
Nevertheless, I just had to know what the scope was - so I tracked down the show and registered for the TV station's online service so I could see the show ... and I was able to get this shot of the scope:
I can't remember EVER seeing an oscilloscope featured on TV before - for it's own sake. Yes, lots of times as set decoration, but never like this.
Well then, are you going to spill the beans about the station name and program name?
WINNER WINNER, CHICKEN DINNER!
I decided to call it a night at 4am after losing colour across multiple CRT's/Shutters, CRT driver boards and main processor boards.
Came back today, put it together and it works! I must have forgotten something in my bleary eyed, 4am daze, but I can't remember what....
It's amazing what you hear - even when you aren't listening.....
I was up late last night, fettling at my desk with the TV providing some noise. There was some nondescript show on and I ignore these types of show with the appropriate amount of apathy for the "quality" of programming that they offer. Ask me later what the show was about and I would likely respond with "What show?"
However, completely engrossed in what I was poking around, my attention was immediately grabbed by the phrase "1972 Oscilloscope" which clearly penetrated my bubble of indifference to the outside world. I quickly hopped up to see what this device could be only to see it for less than half a second. As I watched, they never went back to it.
Nevertheless, I just had to know what the scope was - so I tracked down the show and registered for the TV station's online service so I could see the show ... and I was able to get this shot of the scope:
I can't remember EVER seeing an oscilloscope featured on TV before - for it's own sake. Yes, lots of times as set decoration, but never like this.Well then, are you going to spill the beans about the station name and program name?
However, we also have another scenario called "split receptacle" to provide MOAR POWER ... ! (In a normal circuit, the total circuit can only supply 15A at 120V.)
In Germany there is this TV show "Bares für Rares (cash for rares)" where someone offered a Tektronix 541A.
Apart from the expert, nobody really knew what to do with the device. In the end, it was sold for 100 euros.
In Germany there is this TV show "Bares für Rares (cash for rares)" where someone offered a Tektronix 541A.
Apart from the expert, nobody really knew what to do with the device. In the end, it was sold for 100 euros.
Wow that's cool ! The Tek is the star of the show (a segment of it anyway) and you can see it really well in the picture !
I think it would be worth contacting VintageTek museum in the US so they can add it to their database ! They keep track of the old Tek scopes that appeared in moves and shows !
Look here :
https://vintagetek.org/tektronix-in-movies-shows/
VARTA Battery :
I am sad to say that the poor battery did not survive the night.
IIRC I started discharging it at 2AM last night. I just woke up, 12H45, so about 10+ hours, immediately checked on the battery.... only to find voltage was down to.... 7 V ? No... well below that.... which is still a massive understatement.... voltage was down to.... 0.8V !!
Rob I am so sorry, I failed to protect this battery from under voltage.... I am a failure....
That said... even at 0.8V believe it or not, it was still spitting out a sizable current, 1mA !!
After 5 minutes or so, battery recovered a bit and unloaded voltage went up to 2.5V.... which from memory was also the voltage it read after its 30 years of storage when I dug it out the other day !
So I guess this battery "likes" this particular voltage...
So what to do now...
First I would like to not over dramatize the fact that I let it go flat.... because it had already been flat for 30 years, so I probably didn't do any more damage than had already been done, eh ?
Also, the fact it was still putting out 1mA at only 0.8V means, to me at least, that it's a warrior, it wants to live...
So I think I will charge it again, using Wilson. Slow C/10 again.
Then will do another discharge cycle, but this time I will conduct the experiment during the day, so that I can keep an eye on it regularly, from beginning to end, and will take note of precise start time, and time stamp for every voltage and current check I do.
Would be easier if I could do it automagically with a GPIB setup and some clever S/W on a computer... but alas the lab is nowhere near as sophisticated for now ! It's my plan for it be, though...
Also, since I have plenty of real estate on the bread board, I could add a comparator chip and a little miniature relay to automatically disconnect the battery when it reaches a certain voltage threshold. That would be neat.
The saga continues....
Ah great !
Had a similar moment when I fixed my 544A I remember... I had it fixed,working... then I put it back together and it failed to boot !
After pulling my hair and being close to wanting to throw it in the trash... I eventually found the problem !
See that little " bus " board on the side of the scope, that connects the bottom and top boards together, to supply power and data lines
Well... turns out it is NOT keyed, it can be rotated 180° and it will still snap into place just fine !
So yeah, I had put it back the wrong way around... luckily it did not cause any damage and the scope has been just fine for 5 years now !
VARTA Battery :
I am sad to say that the poor battery did not survive the night.
IIRC I started discharging it at 2AM last night. I just woke up, 12H45, so about 10+ hours, immediately checked on the battery.... only to find voltage was down to.... 7 V ? No... well below that.... which is still a massive understatement.... voltage was down to.... 0.8V !!
Rob I am so sorry, I failed to protect this battery from under voltage.... I am a failure....
That said... even at 0.8V believe it or not, it was still spitting out a sizable current, 1mA !!
After 5 minutes or so, battery recovered a bit and unloaded voltage went up to 2.5V.... which from memory was also the voltage it read after its 30 years of storage when I dug it out the other day !
So I guess this battery "likes" this particular voltage...
So what to do now...
First I would like to not over dramatize the fact that I let it go flat.... because it had already been flat for 30 years, so I probably didn't do any more damage than had already been done, eh ?
Also, the fact it was still putting out 1mA at only 0.8V means, to me at least, that it's a warrior, it wants to live...
So I think I will charge it again, using Wilson. Slow C/10 again.
Then will do another discharge cycle, but this time I will conduct the experiment during the day, so that I can keep an eye on it regularly, from beginning to end, and will take note of precise start time, and time stamp for every voltage and current check I do.
Would be easier if I could do it automagically with a GPIB setup and some clever S/W on a computer... but alas the lab is nowhere near as sophisticated for now ! It's my plan for it be, though...
Also, since I have plenty of real estate on the bread board, I could add a comparator chip and a little miniature relay to automatically disconnect the battery when it reaches a certain voltage threshold. That would be neat.
The saga continues....