Test Equipment Anonymous (TEA) group therapy thread

[med6753]

About to power up the “repaired” 2235 switcher. Wish me luck. If I don’t post again it took me out as well this time 

Safety glasses and ear protection donned!

Looking for some smoke signals from across the pond. 

[bd139]

Well unexcidedly it just blew the fuse. Boring. More debugging!

[mnementh]

   

What sorcery is this?!?     I don't know whether to be terrified, amused, or nauseated. 

And I suppose more importantly... do I dare leave this crushed, folded, spindled, and otherwise accursed Kung-Fu cribbery alone in a room with my two small children, lest they offend it with their irrepressibly rude, unruly behavior and become the subject of its supernatural ire? 

mnem
It's like they turned a TARDIS inside-out. 

Looks like an ideal companion to my Cat Eating Quilt-Monster^tm - which is  simply really the huge real down duvet that I used to have that could eat as many as four cats for Breakfast and still have room for more.

Yes, we similarly have a "Child-Eating Bed-Couch of Doom"™ that my little ones STILL try and hide inside of to jump out and go "BOOO!!!" at mommy and daddy... of course, now the ruse is given away by quivering little butts under the end couch-cushions all awry, but we do still try and "EEEEEK!!!" appropriately...   

Holy crap, who pissed in your wheaties this morning?  Go have some more coffee and calm the fuck down. 

Dude... if I was any calmer, I'd be comatose. I got it ALL out now; I'm good.   

About to power up the “repaired” 2235 switcher. Wish me luck. If I don’t post again it took me out as well this time 

Safety glasses and ear protection donned!

Looking for some smoke signals from across the pond. 

Safety squints engaged here as well! You never know how far that shrapnel will reach! 

mnem
"Smoke 'em if you got 'em!"

[mnementh]

Well unexcidedly it just blew the fuse. Boring. More debugging!

mrrp?

Don't forget to check Q9070 for short. AGAIN. 

mnem
"Coffee good. Internet bad."

[bd139]

That’s fine. Have checked that. This is weird.

[shakalnokturn]

Anything to do with this?

[med6753]

Well, I'm going to go get some sleep. If there's going to be fire, carnage, or general mayhem I'll have to view the aftermath later. 

 

[bd139]

That’s fine. Have checked that. This is weird.

CR907 in wrong way. Nope switcher not gonna switch there.

 

[shakalnokturn]

Who else needs sleep?

[med6753]

Who else needs sleep?

I do. I work at night. Mornings are my "evenings" and it's time for bed.

[shakalnokturn]

As part of my therapy I need to grumble about the stuff I ran for and missed recently:

Tek THS 720A (dead battery) for 80€ 
Working Hameg HM1007 for 55€ 
Working Fluke/Philips PM3384B for 40€ 

Frustration is such that I chewed my soldering iron.

I'll get back in a few days on the stuff I did get my hands around, not bad, but still not as much of a bargain...

[bd139]

Who else needs sleep?

Me for sure.

Turned CR907 around and it works 

[mnementh]

https://youtu.be/nod7rUzIX8w

Okay... Now I am calm... for real. 

That’s fine. Have checked that. This is weird.

CR907 in wrong way. Nope switcher not gonna switch there. 

Sorry... somehow I infected you through the computer screen; you've caught my chronic IDID : "Intermittent Diode Inversion Disorder". 

mnem

[mnementh]

[Random Corner of the Internet Mode]

https://youtu.be/CKUcFhJLm34

https://youtu.be/7wHS2bwg-aw

Jeebus... this is really "a Thing"... seeking out and eating the oldest C-Rats & MREs you can find. 

[/Random Corner of the Internet Mode]

mnem
You cannot unsee that.

[bd139]

That’s fine. Have checked that. This is weird.

CR907 in wrong way. Nope switcher not gonna switch there. 

Sorry... somehow I infected you through the computer screen; you've caught my chronic IDID : "Intermittent Diode Inversion Disorder". 

mnem

Hahaha

All working now. Apart from a put a quick blow fuse in the inlet which promptly blew as it was supposed to. Ordered some slow ones otherwise they don't survive the inrush! Has two other issues I will resolve over the next few days but that's oscilloscopes for you!

This is running off 46V DC here instead of mains. Joy to switching power supplies! When they're not exploding 

[Specmaster]

Well unexcidedly it just blew the fuse. Boring. More debugging!

Oh good, I had thought it might have all gone south as I have just seen 3 fire engines with the their blues and twos on racing down the A12 London Bound 

[bd139]

I'd be toast by the time they got round the M25 

Two issues remaining on that scope:

1. flickering. Looks like it's related to the fact the previous numpty owner bodged in a couple of random 470K resistors in the intensity control circuit rather than suitably rated ones and made a vile fluxy mess of the board around them. They even burned holes in the power switch bar with a soldering iron. Or the intensity knob is knackered. Going to substitute some VR37s in there when RS have stock (around 12th of december) and see what happens. I will replace all the 510K ones and clean the board to kill any leakage paths at the same time as they are trouble!
2. channel 1 doesn't want to work just on its own. channel 2 goes me too and appears as well. Switch needs cleaning I suspect.

Everything else works!

Look at this shit:

[Terry01]

As part of my therapy I need to grumble about the stuff I ran for and missed recently:

Tek THS 720A (dead battery) for 80€ 
Working Hameg HM1007 for 55€ 
Working Fluke/Philips PM3384B for 40€ 

Frustration is such that I chewed my soldering iron.

I'll get back in a few days on the stuff I did get my hands around, not bad, but still not as much of a bargain...

That made me LOL a little! 

[Cerebus]

Who else needs sleep?

I do. I work at night. Mornings are my "evenings" and it's time for bed.

I'm currently working German time, but working remotely from my home in England. I spend the whole day talking to people about things in Central European Time, then knock off around 17:30 CET to suddenly come to ground here at 16:30 GMT. It's discombobulating in a way that working nights (or shifts) is, but different.

[bd139]

Last time I did that I made it mandatory that I worked on my schedule because I'm in impossible bastard.

It was US as well so there was about an hour of overlap at the end of the day.

[Specmaster]

I'd be toast by the time they got round the M25 

Two issues remaining on that scope:

1. flickering. Looks like it's related to the fact the previous numpty owner bodged in a couple of random 470K resistors in the intensity control circuit rather than suitably rated ones and made a vile fluxy mess of the board around them. They even burned holes in the power switch bar with a soldering iron. Or the intensity knob is knackered. Going to substitute some VR37s in there when RS have stock (around 12th of december) and see what happens. I will replace all the 510K ones and clean the board to kill any leakage paths at the same time as they are trouble!
2. channel 1 doesn't want to work just on its own. channel 2 goes me too and appears as well. Switch needs cleaning I suspect.

Everything else works!

Look at this shit:

Yep, I'd hoof those resistors right out of there, I'd bet they are getting really toasty  after a while and drifted way out of spec. What the heck was it they were soldering with, a red hot poker?

Yes, a dirty switch could be the culprit, more likely to be a duff switch or sticking on?

[bd139]

Probably got crap in the switch.

Found another problem. If you hold the delay timebase knob it triggers! Might be because it's open, not grounded and it's floating on DC though.

[tautech]

Two issues remaining on that scope:

1. flickering. Looks like it's related to the fact the previous numpty owner bodged in a couple of random 470K resistors in the intensity control circuit rather than suitably rated ones and made a vile fluxy mess of the board around them. They even burned holes in the power switch bar with a soldering iron. Or the intensity knob is knackered. Going to substitute some VR37s in there when RS have stock (around 12th of december) and see what happens. I will replace all the 510K ones and clean the board to kill any leakage paths at the same time as they are trouble!
2. channel 1 doesn't want to work just on its own. channel 2 goes me too and appears as well. Switch needs cleaning I suspect.

Everything else works!

Look at this shit:

Don't ya grit ya teeth when ya see that !
Someone needs a good kick in the nuts.
Retards.....who would relace a 1W with a 1/4 ?   

BTW, congrats on the progress.

[med6753]

I'd be toast by the time they got round the M25 

Two issues remaining on that scope:

1. flickering. Looks like it's related to the fact the previous numpty owner bodged in a couple of random 470K resistors in the intensity control circuit rather than suitably rated ones and made a vile fluxy mess of the board around them. They even burned holes in the power switch bar with a soldering iron. Or the intensity knob is knackered. Going to substitute some VR37s in there when RS have stock (around 12th of december) and see what happens. I will replace all the 510K ones and clean the board to kill any leakage paths at the same time as they are trouble!
2. channel 1 doesn't want to work just on its own. channel 2 goes me too and appears as well. Switch needs cleaning I suspect.

Everything else works!

Look at this shit:

Yep, I'd hoof those resistors right out of there, I'd bet they are getting really toasty  after a while and drifted way out of spec. What the heck was it they were soldering with, a red hot poker?

Yes, a dirty switch could be the culprit, more likely to be a duff switch or sticking on?

The result of allowing dumb asses to have soldering irons. 

[bd139]

Indeed. Usual ham radio lot 

One of the guys at the local club was fixing his rig with a flipping great big weller gun. Give a monkey a gun...

Ordered 50x VR37 510K resistors from RS. Need 6!  Was £1.00 each for 6 off or £0.10 for 50x. So was cheaper to buy 50x  .  Unfortunately no stock until 13th of December so I’ll have to wait for ages to fix this scope 

Will sell the rest on eBay