UPDATE: So, a couple of days later the problem returned! So I used IPA and some slightly thicker paper to clean the contact again. I also found that those pots between the contacts are plug in modules, so I removed them giving me better access to the contact, this time I could give them a really good flush out. I also used an extremely soft professional artists paint brush (very small) and was able to wipe the Pcb down with IPA and underneath the contacts. The brush is so soft the contacts didn't even move. I also cleaned the pins on those plugin pot modules with IPA also. In addition I found the VAR pot on the Volts/Div adjust to be quite dirty, so cleaned it up with IPA also. It's working again, but I have to say, one or two of those contacts on the Pcb seem to have been soldered down squint, they are soooo close to the edge of the gold contact pads they sit on. Hmmm!
If you start to see more issues with the volts/div dial I would recommend against using Deoxit to fix them. In the Tek465 service manual section on cleaning the attenuator switch contacts (which you cleaned in this video), they write: Cleaning the switch contacts should only be done using isopropyl alcohol, especially in the area of the vertical attenuator boards. Carbon -based solvents will damage the polyphenylene oxide boards used for the attenuators. Apply the isopropyl alcohol with a camel hair brush. Do not use cotton swabs as they tend to snag on contacts, possibly causing damage, and hold strands of cotton, causing intermittent electrical contact.
Great seeing a good look inside the 465, nice repair, I had no idea the switch contacts were made like that. I love analogue Tek scopes, I have a 2235, 2236 and a 2445A :) I would love to have a modular 7000 series one, and the curve tracer 🤔
Yep, you have to stay off the Caffeine! I found if you just press down on the bridge between the two actual contacts instead of each individual finger it's a bit safer/easier.
Amazing video. I have the same exact oscilloscope that needs the same clean up. Just got it and what I have seen it is a good unit. Even with some dodgy switches I was able to fix my old B&K oscilloscope.
I repaired a teleprinter start up circuit using the paper and cleaner method on the relays once. I found the rougher, thicker recycled paper did a cracking job cleaning them 😃. Awesome video.
The good old paper trick, it does work well especially when used with Deoxit, I would have done the same to channel 2 as well though, if one is bad the other is probably close behind.
Reading about it, Tek 465 folks are saying Deoxit is frowned upon for those contacts. So I'm glad in a way I didn't mess with Ch.2, the contacts are particularly fragile. Saying that, if it were a refurb for somebody else then I might have done something......but as it's mine I can do it anytime I guess.
I like the switches and lights on the front panel. I can't imagine what it would be like to design those PCB's by hand back then. I've done a few small ones in the past (school), quite fun to do. But such large PCB's... They are nice to see though.
For the dual gang pot, standing the scope on its face would get the De-Oxit down where it is needed. But I suspect it splashes around all over the place as it is.
Yep, if my method had failed I guess that was next. However, it's quite a jet of Deoxit that comes flying out that nozzle!......tends to go everywhere.
@@IanScottJohnston It isn't quite that bad for your switches in the scope. The way they are designed means that they wipe after making contact. That does make a huge difference. you've given them a little extra wipe by bending them down a bit.
I had an intensity pot problem with my old 422 from about 1968. It would hop from too low to too high. I couldn't find an exact replacement. I took it apart and found a dried blob of grease stuck to the wiping surface. Removed it and all is well. Not sure it deoxit would have helped there.
What's the scoop on deoxit? I couldn't see the label on can but it seems it was D5, I'm thinking that D5 would be great on the switches as it doesn't leave a residue, but that F5 would be better for the potentiometers a it does leave a lubricant for smooth wiper action across the carbon track.
Umm the service manual actually explicitly tells you not to use de-ox it on the gold contacts (well at least the 475 one does and the 465 is really similar).
You're a luck chap getting hold of a 465...they were a revolution when they were introduced all those years back. Always worth the effort unless they have been abused...top kit for sure.
UPDATE: So, a couple of days later the problem returned! So I used IPA and some slightly thicker paper to clean the contact again. I also found that those pots between the contacts are plug in modules, so I removed them giving me better access to the contact, this time I could give them a really good flush out. I also used an extremely soft professional artists paint brush (very small) and was able to wipe the Pcb down with IPA and underneath the contacts. The brush is so soft the contacts didn't even move.
I also cleaned the pins on those plugin pot modules with IPA also.
In addition I found the VAR pot on the Volts/Div adjust to be quite dirty, so cleaned it up with IPA also.
It's working again, but I have to say, one or two of those contacts on the Pcb seem to have been soldered down squint, they are soooo close to the edge of the gold contact pads they sit on. Hmmm!
Brilliant fix! Love the heat shrink idea!
If you start to see more issues with the volts/div dial I would recommend against using Deoxit to fix them. In the Tek465 service manual section on cleaning the attenuator switch contacts (which you cleaned in this video), they write:
Cleaning the switch contacts should only be done using isopropyl alcohol, especially in the area of the vertical attenuator boards. Carbon -based solvents will damage the polyphenylene oxide boards used for the attenuators. Apply the isopropyl alcohol with a camel hair brush. Do not use cotton swabs as they tend to snag on contacts, possibly causing damage, and hold strands of cotton, causing intermittent electrical contact.
See update in Post #1.
Great seeing a good look inside the 465, nice repair, I had no idea the switch contacts were made like that. I love analogue Tek scopes, I have a 2235, 2236 and a 2445A :) I would love to have a modular 7000 series one, and the curve tracer 🤔
Beautiful peace of art almost, just the colours of the different parts. Must have been happy days.
Nice tip with the heat shrink nozzle.
I've tried to bend those contacts before and FAILED. You must still have steady hands. Great video.
Yep, you have to stay off the Caffeine!
I found if you just press down on the bridge between the two actual contacts instead of each individual finger it's a bit safer/easier.
Amazing video. I have the same exact oscilloscope that needs the same clean up. Just got it and what I have seen it is a good unit. Even with some dodgy switches I was able to fix my old B&K oscilloscope.
I repaired a teleprinter start up circuit using the paper and cleaner method on the relays once. I found the rougher, thicker recycled paper did a cracking job cleaning them 😃. Awesome video.
Nice idea, I have the same paper somewhere!
I love your content. Keep up the good work!
As those pots are upside down I would have also tried to get deoxit on top of it so it can run down the legs into it, that sometimes works.
I've got an old Tektronix 2211 that I bought off eBay in the late '90's for $75.00 and it works great.
That heat shrink idea is genius!
I might have to use that 🤓
The good old paper trick, it does work well especially when used with Deoxit, I would have done the same to channel 2 as well though, if one is bad the other is probably close behind.
Reading about it, Tek 465 folks are saying Deoxit is frowned upon for those contacts. So I'm glad in a way I didn't mess with Ch.2, the contacts are particularly fragile. Saying that, if it were a refurb for somebody else then I might have done something......but as it's mine I can do it anytime I guess.
I like the switches and lights on the front panel. I can't imagine what it would be like to design those PCB's by hand back then. I've done a few small ones in the past (school), quite fun to do. But such large PCB's... They are nice to see though.
Those things are wonderful, Cheers Ian :)
17:00 you could remove the attenuator. It's just a socket.
For the dual gang pot, standing the scope on its face would get the De-Oxit down where it is needed. But I suspect it splashes around all over the place as it is.
Yep, if my method had failed I guess that was next. However, it's quite a jet of Deoxit that comes flying out that nozzle!......tends to go everywhere.
I can’t stand the way they dispense the aerosol! A light pass with a small heat gun will eliminate any overspray
@@thatampguy It really needs to be wiped off. There are residues that would contaminate the board after evaporation.
@@donepearceD5 leaves behind a 5% residue apparently, so I’ll go back in with 100% IPA I think and clean off the fingers/pcb.
@@IanScottJohnston It isn't quite that bad for your switches in the scope. The way they are designed means that they wipe after making contact. That does make a huge difference. you've given them a little extra wipe by bending them down a bit.
Man I LOVE the 400 series
I had an intensity pot problem with my old 422 from about 1968. It would hop from too low to too high. I couldn't find an exact replacement. I took it apart and found a dried blob of grease stuck to the wiping surface. Removed it and all is well. Not sure it deoxit would have helped there.
What's the scoop on deoxit? I couldn't see the label on can but it seems it was D5, I'm thinking that D5 would be great on the switches as it doesn't leave a residue, but that F5 would be better for the potentiometers a it does leave a lubricant for smooth wiper action across the carbon track.
Umm the service manual actually explicitly tells you not to use de-ox it on the gold contacts (well at least the 475 one does and the 465 is really similar).
So I heard…..plan is to go back inside with IPA and clean up at some point. D5 leaves behind a 5% residue so it’s not a lot.
I'd really suggest getting your hands on the Tek service manual. Tek makes all schematics and manuals available for download!
I can't recall but I think there was one in the box
No worries I have the Service Manual PDF (50 pages).......It's the 2430A User Manual in the blue folder from what I've seen.
You're a luck chap getting hold of a 465...they were a revolution when they were introduced all those years back. Always worth the effort unless they have been abused...top kit for sure.
Got one as well, probably works and needs a clean......
And yes needs new fee, because they are rotten.
Title card says "ocilloscope".
Oops! Cheers.
I call them o so silly scopes.😄
Fixed...:-)