No.096 - Keithley 225 Current Source Repair - Part 1
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- Опубликовано: 30 сен 2024
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This Keithley 225 was supplied by a viewer, I couldn't resist it for the workshop!
Several faults with the unit keep me on my toes in this interesting Part 1 repair.
UPDATE: Check out Part 2 here:-
• No.097 - Keithley 225 ...
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The rubber cube is probably used as a complacent feet on an automotive 2 post lift to lift cars...
Correct!
... and to lift one side of electronic devices, it seems ^_^
I was also surprised that you didn't bench check the transformer. You must have been confident with your repair. I have one of these old current sources and it is surprisingly accurate considering its age.
Great product
Rubber block:
A spacer for a multi-post car lift (ex. Bendpack). As in, this goes onto the lifting arms and touches the cars jack points when lifting a car.
Help ma boab!.......I didn't think anyone would get it....WELL DONE!
@@IanScottJohnston I think you under-estimate the small, but not insignificant cross-section between people who are into electronics AND racecars :)
Clearly!
very good!! ...my guess was somewhere in a wider ballpark. but also not close enough to know. in fact have never encountered such thing before myself. well done 👍👍
The grooves on only 1 face kinda gave it away. Was the first thing I thought of too.
Kind-of looks like the rubber blocks you use to lift a car when using a hoist.
Wonderful job so far - looking forward to the next part (as always) =D
Good to have a well stocked junk box! What are the odds you’d have those transistors!
I think I got them 30yrs ago from a retired TV engineer who donated boxes of components to me. I kept everything!
"Let me just screw up off-camera."
LOL. No, please, we want to see it when you screw something up :)
Nothing odd about the mains plug to me, mine are all identical to that one, what are you talking about?
So you needed to rob the local museum for replacement transistors?
Hey that is an NZ/AU/China plug...... shouldn't they have sent it to me as I am closer ? LOL
Well that looks familiar.... i'm sure i've got one of those here somewhere LOL.
I thought it looked like a cover for the water supply stop valve on paving outside a house! They are all hard
Plastic nowadays, they used to be cast iron! Plumbers used to call them Toby Covers!
Rings a bell from days gone by!
is it.... one of those rubber shock absorber vibration isolation thingies used in the construction industry? i.e. in buildings floor or something like that? perhaps am wrong... ok i will peek now to ssee the correct answers heeheehee
Great another fix vid from Ian ! My first thought was optical polishing but thats 'pitch' but I still think it could be as the channels I think are for draining water or massive brake blocks on something very heavy ! what sort of rubber is it I wonder, perhaps 'Viton' dunno, any how lovely old current source and I'm looking forward to part 2. Oh did the DP move when you switched range ?...cheers.
Yes the DP moves.
@@IanScottJohnston Oh well a mile out with the rubber block !
@@andymouse I was going to go with melted down rubber dolls. :-)
Cheese!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
@@TheEmbeddedHobbyist LOL !
I have a hate relationship for those big rubber blocks, the Big one stopped me driving for life! it fell off a lorry I was behind, hit the screen & I ended up in a squashed car up a tree.
There is 2 other places I have seen them one is on my brother in-laws car lift & back when we was kids they had them in swimming pools @ the deep end, was fun! trying to grab them.
When I decided to replace the orignal exhaust hanger I struggled to fine anything cheap on Ebay......harder than one thinks to find a "rubber block", but these seem like they'll do the job. Sorry to hear about your experience though!
It's a flat tire,(a peace) ;)
hey! any chance you could say / or recommend that what was that high temp epoxy? was it jb weld or something elsse? seems like it could be pretty useful
btw (this is not related). but have you watched yet any of the robrenz youtube videos? he does some fantastic stuff. with the goop, and also with maching his own 4 point test probes. it is really outstanding quality of workmanship. the dude is a genius
I have two types I use:
JB Weld = good to 288degC (I used this one on the 225)
Permatex High Heat Epoxy = good to 500degC
I think I have one of these,... Nice to see another video Ian.
I expected you to check the transformer while it was removed!
Did you do that?
Yes I did, and both the primary side and secondary side had dodgy/broken connections (hence the rework).........but afterwards I didn't pay too much attention to the ratio of resistances of the various taps.......I just knew they were intact.
@@IanScottJohnston my faith is restored ;-}
Great job, these are videos "more realistic" of what may happen with 'restoration repairs', as always that you for the wonderful work.
It'll be a crapacitor... its always a crapacitor.