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- Опубліковано 5 жов 2024
- In today's video we take a second look at the Tektronix 465 scope. Looking through several issues we then determine that the fault is in a part of the scope we repaired in video part 1.
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I'd really like to see an alignment video on this scope. Best troubleshooting video I've seen so far.
Thats what i was thinking..An alignment video for sure...please?
This is a PERFECT instructional video. There's nothing better than hearing what an experienced technician is thinking as he analyzes and troubleshoots various problems. Thanks so much for taking the time to make these videos. It's a BIG help to many of us.
Glad it was helpful!
@@TheRadioShop is pt 3 coming?
73
Hello Buddy wow can I relate to that repair. Around 30yrs ago I worked for Amalgamated Wireless Australasia Ltd (AWA) here in Sydney Australia. At that time I had the pleasure of working on Tektronix Scopes for about a year or so. I specifically remember working on a 465 that had landed face first on the floor of an Australian Navy ship. As we had the contract it was to be rebuilt as cost was not an issue. The time base knob had been pushed back into the front panel destroying the cam switch and all of those contacts you found in your repair. That was just one of the problems, however Tektronix were just down the street so all parts needed were ordered and I repaired and calibrated that scope. I did not see the final bill for the repair but I do know it gave me something to work on that I have never forgotten.
All the best with your restoration as Tektronix had a policy of having chips and other parts manufactured with their own part numbers marked on them. Generic parts were a no no :)
Also some parts were marked SOT on circuit diagrams just to keep you on your toes. It was common to spend a week solid on one repair and calibration.
That sure tests your skills and ability.
Cheers from down under.
This scope had so many problems and the guy who gave it to you was not a bad actor and knew his business but I think he did not want to stay up several times to 2:00 am fixing and fabricating. All those broken solder joints so this scope has not run for 20 years but is now golden thanks to our Buddy. The guy with diligence and wit to keep fighting for a misbehaving unit
Very kind words. Thanks
Nice repair, that sure was a tough one.
I picked up two Tektronix 465 scopes, one of them is a 465B.
I have big problems with the inputs on the 465 so I am working on the 465B, that scope seems to work okay on channel ! but channel B is dead, I think it is Q1875 because 2 of the leads were broke off.
I can't find it in the parts list but the number on the transistor is M15 and under that number is 0198 on the B channel vert board.
It must be a Tektronix part number, Tektronix is noted for using propriety parts.
One of the best troubleshooting videos on test equipment I’ve seen! Thanks for spending the long hours in a hot workshop to bring it to us. Would have loved to seen references back to the schematic when you were isolating the 5V rail. Knowing what specifically to remove from circuit was key. Thanks again!
Thank you very much!
BTW, yes I should have shown the schematic a bit more. Just so much to do I edited that part out.
Your diagnostic skills never cease to amaze me.
Thanks for that nice reply Scott
Very enjoyable and useful. I hope you post a followup on the total restoration. Great stuff!
Thanks for this video Buddy. I bought a Tektronix 475A with multiple issues a couple weeks ago and this video has been very helpful. Internally the 475A is still very similar to the 465 as far as I can tell, so there was a lot of useful information in here for me. First, mine also had no sweep, just a dot on the screen. Second, channel one would not respond to any input but channel two showed some deflection. Third, the main timebase knob seemed to work and would click as you turned it, but if you pulled it out for the delayed sweep it would just free spin, no clicks or detents. Like it was stripped out. Fourth, I went inside of the scope to check rails and the -15v rail was fluctuating between -22v and -25v. After a few minutes this caused one of the 25v rated tantalums on the -15v rail to randomly explode while I was looking inside - scared the hell out of me. I knew tantalums were very strict on their max voltage limits but wow, the rail must have gone over -25v for a few seconds or something. All the other rails seemed within spec.
Within a week, I have fixed all of these major issues thanks to videos like yours and I'm working on the smaller ones now. I will tell you this, taking apart that entire timebase section, repairing it, and then putting it back together correctly was a serious project!
Outstanding! I just picked up a 465 that is not working and look forward to getting it restored also. Watching your videos was very insightful. Thank you!
Well done as always Buddy. Couldn't agree more about replacing those tantalum caps. They are right up there with those SMD electrolytic cans for causing a lot of problems. I love it when they explode off the board and now you have a devil of a time finding where they came from. 73 Doug.
Thanks Doug, once had one explode in my face before. Not a pretty sight lol.
Great little troubleshooting series. I enjoyed this. I'm glad to see that you aren't afraid to swap in compatible components to isolate faults. That's what I do. Anyway, great video.
Enjoyable ride along, thank you. Appreciated that your video was 100% content instead of worrying about "scene transistions" and other "video production" efforts. Where's the Beef?.. you showed us! 👍😁
Thank you, I am a bit of a simpleton.
Great job on the Tektronix 465. Looks good and works good now. Keep the camera rollin, I learn something every time I watch. Thanks for your time.
Thank you, glad to be of help
Interesting to watch and learn from your systematic troubleshooting methods. I had a similar problem(s) with a Tektronix 7403N I had been given: trouble was, I am a mechanical engineer not electrical and was not certain quite where to start at first. I am sure now that I changed out quite a few parts that I need not have but hey-ho! It was a a learning experience which is what I hoped it would be but I almost gave up on it.
The main problem turned out to be in the high voltage (+12kV, -3kV) supply which also caused a 'wet' tantalum cap on the +15V rail to 'pop' and short-out a regulator transistor. I managed to find a replacement HVPS for in Sweden of all places, though I do intend to dig out the potting compound on the PDA multiplier at some point, to replace the diodes and caps so I have a spare!! Firstly, as I had no HV probe I had to make up a voltage divider probe for my multimeter to check it out, rubber gloves on, of course.
All in all, quite an experience and not a single shock. :-)
Thanks Graham, and that was an interesting fault you had. That is the problem with tants. they fail short. Many problems are mostly caused by a single fault, in your case the HV. Glad you made it through without a shock. Thanks for sharing
Hi Buddy, great work on that good old scope. Glad to see you were able to get it to behave. I have been thinking about getting one of these old gals to add to my bench. Your work on this makes me think I could probably fix anything that may be wrong with one. Love your cool style and determination.
73
Gary Bevis
Thanks Gary. I say go for it. Really great old scope. Not that hard to work on and if parts are needed they made a ton of these things.
Your welcome Buddy. I look on ebay and the ham swap sights on the web, if I can get it for under $100, I will pounce, even though I don't really have the room, but you just cannot own too many oscilloscopes. What do you think a fair price is Buddy? I know I won't beat your deal (if I had a million dollars I'd send you some goodies too!) Take care sir and try and stay cool in the heat.
I also have a 465/DM44 that I'm in the process of restoring. Like yours it has been a very interesting project. I posted the repair details in your 465 repair thread in the EEVblog.
Thanks Michael. I will have a look.
Good to see it up and running. Had a fair bit of work to do to this one to bring it back to life but well worth it.
Yes a little work but turned out great in the end. These scopes are so cool to use. Thanks Mike
Very interesting repair. It was difficult, but you stuck to it. Good job, Buddy.
Thanks Julia
It’s a pleasure to watch your videos,the way you approach the troubleshooting is amazing.beautiful learning experience thank you for your time appreciated very much.
I always learn something from your videos, Buddy, and I get a big chuckle out of your written subtitles where you give yourself grief with 20-20 hindsight. :) Thanks for all the time and effort you put into sharing this work with us.
Thank you Craig. I glad you like them my friend. Thanks again
Instablaster
I just purchased a Tek 485 for $50 on eBay. Has traces so we’ll see when she shows up. All the lights on the panel seemed to be on in the photos. Said for parts or repair, usually they don’t have any powered up photos when they describe the item like that. I hope she works, a 350mhz scope will be a nice addition to my bench. All others were $150+ for parts or repair. Maybe I got lucky. If I can’t figure it I know who to ask 😀. I have a Rigol 1054z and an old Elenco 25mhz analog scope in great shape but always wanted a Tek 400 series. Thanks for all your great videos. I’m still a relative greenhorn in the electronics game, pretty good at tube amps and radios so this will be a challenge. Guys like you give me something to shoot for.
Nice seeing you back to posting some repairs....GOOD JOB!!!!
Great video as usual Buddy, sometimes problems can be deceiving but with patients and the right troubleshooting procedure success will be found. Thanks again and I learn something from every video.
good job buddy!! sometimes I can think ahead, but not very often. I felt it was the ic at first, then changed my mind, thinking it was a tantalum because they can fail open too, but you found that 5v fault, the answer.
Yes that 5 volt rail was the failure. But I played it off a bit to make a more interesting video. So you were spot on.
Thank you for the informative videos. I just got a 465 at a small hamfest. I was told that it was not working right. Just a bit of an understatement. When I turned it on all I got was a 1" line of centre and none of the controls work to move it. I have my work cut out for me. 73, Chris VE2MW
Hi Buddy, I bought two 465s as non-workers. One I got working, the other had suffered a catastophic failure in and around the beam finder circuit. This one has a Vertical Output board in that is in neither of the manuals (early/late) and as the components are so burned up I can't ID them or refer them back to any circuit diagram. Bummer! Good work on your 465, really enjoyable videos.
Thanks. My board does not look anything like it? I will see if I can find some scans if I can.
Woooow that was a bag of worms.
Congrats for your patience.
I know this 465, have used it till the late 90s.
Personally i own a 475, had to calibrate this thing. Thankfully i have the complete manuals.
Thanks for sharing this videos.
Cheerio from germany.
Yes lots of little issues in this one. But the end results were great. Thanks for the comment and good luck on the 475
Bravo Buddy, Nice to see that old sweetheart up and running.
Thanks, it was fun to work on.
Great video Ty. I used to love working on those. So many with noisy attenuators, which we used to wash (literally) and never had any back. Must have done hundreds in the late 70's early 80's. Tektronix is beautiful equipment to work on.
Tony Griffiths. Hi Tony...just bought a Tektronix 465B and it seems to have a problem in the Horizontal. The Beam is too short of the CRT on both the Left and Right...any ideas?
The 465B had the 475 attenuator board on it and gave 120Mhz bandwidth if I remember correctly. I left the bench in 1982, so memories are somewhat limited. Could be blanking, maybe the gain of a semiconductor in the horizontal amplifier. Good luck in your fault finding.
Buddy, nicely done. One step at a time. Big thumbs up! Joel
Thanks Joel. This was a fun one to do.
Recently I bought a used 466, very similar to your 465 (466 with storage). Yes, tantalum caps are notorious, they are little time bombs. Maybe I will replace them. My 466 had a couple of broken shaft joints, which are unobtainable. I was able to glue them up with super glue. Unfortunately the switches and pots are very hard to get access to for cleaning. Tektronics did not want them to be cleaned. Now my 466 works fine. I guess it has not a lot of miles on the counter. I watched your video for future reference. Thanks for sharing. Good job. BTW, the original feet of my 466 have 3 slots. The material has deteriorated, so the feet are broken. I'll try to find replacements.
I know you comment is now 3 years old but I have an option of buying a 466M it’s an ex Canadian military scope (Don’t know if they are built differently for the military and I assume that’s what the M stands for) but it’s in very clean condition. Still dithering between that or an Hitachi V-525 50MHz or a Lecory 9400A. As a newbie wanting to put together a shop so I can begin tinkering with electronics.
Good job troubleshooting Buddy! I've got an old girl waiting for me to get her dancing again. The old tektronix scopes are not a walk in the park I do know that. The one I have weighs at least 60lbs and is very large to work with on the bench. Looking forwards to your next video on this gear.
Thanks Dale, sounds like a good time to get started.
Gracias. Mister. Por. Tener. Tan. Noble. Actitud. Pasará. Brindar. Sus. Conocimientos. Gracias.
I don't drink or have the skills to repair that scope but if I did I would be on my first drunk after all this work. Great job and vids. Carl
LOL Carl. Trust me, really not that hard to do But I think I need a drink now please.
Another great video Buddy. As always it is a pleasure watching your videos.
Great video, used to love these scopes used them at work 30 years ago , at the time I wanted to buy one but just too expensive around about £500! Second hand.
They have gotten a lot cheaper now. Thanks
Hey....
Love this repair.
Where's part 3???
Great job
I finally got back to working on my 465 and got the bent BNC replaced with a proper 10X sensing connector. I found that my horizontal position, and my scale illumination pots were dirty. At 21:24 instead of drilling a hole I took the pot apart and there was a small gap around the shaft area that I was able to spray some deoxit into. now I need to go through the rest of the scope and see what other problems it might have then try to get it calibrated. But before doing that I need to either find or make a shield for the HV area since mine was missing when I got it. I really don't want to find out what 7KV feels like any time soon.
Enjoyable ..... thanks. A Tektronix fan here.
Thanks Tony
subscribed. I thoroughly enjoyed your troubleshooting video for two reasons. Firstly, because of the excellent analysis and solution for each issue, including emphasizing starting at the power supply, and also because I have two working Tek scopes of this generation, a 464, and a 475a.
You talked about having a tube type scope you had worked on, and I was wondering if it was also a Tek scope, hopefully of the 545b era. The reason I am asking, is that I have a Lavoie 265a scope that is the functional equivalent of the 545, that has failed with power supply issues, that I wish to get running again. The reason I like the Lavoie, is that I have a couple of plugins, the CA comparator, and the diode checker plugins, that were really great troubleshooting tools. I have lots of old test gear, and will be watching a lot more of your videos.
Thanks for the comment and sub. Had a Tek 545 no rack. Wish I never sold it. Thanks for sharing.
Good job.. love the good old test equipment.
Thanks
Good job, well explained. Thanks for the vid!
You're welcome!
Hi Buddy, great video! Glad to see it working again. Can't wait to see it fully restored. Thanks for sharing!
Thanks Tony. Really a fun project getting this classic back running.
I heard no squeaks :) Good job, that was a bit of work. If you had found the ripple up front those switches would not be so clean now.
Very good job, Buddy. Thank you for posting it. Thumbs UP!
Thanks for watching Frank
Hello sir what you do for us all is beauty at its best. I am wondering did you ever release Tektronix 465 Repair Part 3 or did I miss it? Thank you kindly and have a great rest of your day.
Thanks for sharing the repair of that 457 scope. Once you get all the new parts installed would you please make a video of the alignment. Thanks again , John C
Will do John and thanks
Nice job. I also have same scope with similar problems,, so this is gonna help so much..
Let us know how it goes Jarno. You will love this scope.
Very informative video clear and precise many many thanks for your time and knowledge. Is there any chance you will do a video showing what to look for on oscilloscope when excess ripple occurs and what causes these problems.
Great job, learned a bunch, Thanks Dave.
Thanks Dave
Love this channel, man you do good work. Thanks for sharing.
Thanks for watching
2:00 in the morning? You get lost into your work. I know I do. Lol. Good job and great patience. I guess it can be seen as therapeutic, takling these projects.
Yep, wife was out of town so I stayed up and worked on the scope. This is one of the most relaxing things to do for me. Really passes the time away nicely. Thanks for watching
bonjour , hello ,
great job Monsieur !!!
eric from France
I also had some scratchy pots but I didn't take them out or drill any holes, all I did was loosen the small screws and pull them apart slightly so I could spray in some contact cleaner.
Good tip
Hi Buddy there a nice honest scope still to this day, & hold there price in the UK,I think I should invest in some type of air con in the workshop, 89.5 f to 91.00 f in the afternoons, extremely humid , I can't get anything done,apart from early mornings.
I also liked the Icom 746 video, I had one of those once. 73 Paul M0BSW
Thanks Paul. Yes I know what you mean about those temps. Was 102 F here yesterday. 9sF today.
31:06. I have those 2N2222 in a metal case if you need one. I think I purchased them from Newark (formerly MCM electronics).
Thanks. Will come in very handy.
I dragged my trusty old 465 out of a corner of my shop and powered her up. It's working, but a lot of dirty pots and switches. I used Deoxit as well, and I think I may have made a mistake by using it on this old girl. Some of the switches didn't like it, particularly the volts/div cams. The Deoxit seemed to create more friction than it had before. The worst thing is, now the channel 2 AC/GND/DC slide switch has lost its detents, it slides back and forth without "clicking", and I think it's really stuck in the AC position.
Can you show us the full alignment procedures of the 465 scope? The 465 and 465B scopes were influential powerhouses for decades, the proper procedures need to be saved for posterity!
Wow I really hope my same oscilloscope works if not I will be happy I watched this video
Great stuff, I will not attempt to fix my HP oscilloscope. Keep it up
Awesome video Thanks for sharing
Thanks
Awesome video as always!! Thanks
Thanks
I just bought one of these for $20 for the sole purpose of learning to fix it myself. Do you have any suggestions other than the Tektronix manual on Tek's website for troubleshooting and repairing these? Great videos, by the way.
GREAT job Buddy, that is a nice scope.
Thanks Bill, was fun to work on. Amazing an old country boy could get it working :-)
It amazes me how you can fix anything, you have lots of patience.
There is an AD on the ARF classifides someone it selling Tektronix 465 parts, not sure if the stuff has sold though.
Brilliant stuff, loved watching this as i have a minty Tektronics 465M ,
Ps Is there any chance you can do a video on a two tone ssb linearity test, using one of the currently available sinal gereraors that have the 2 channels eg, Feeltech FY6600 or equivalent ? apparently you have to use a SUMMING resistor Y circuit?
Much apprexiated and 73 from Australia
At 20:59 you are taking the holdoff pot and switch apart. You missed an opportunity to lubricate the pot and switch in place. Using an artist's brush paint some Caig F5 pot lubricant onto the brown plastic areas. The lube will soak through the cracks into the pot and swich by capillary action. Do that first before taking stuff apart. You will be surprised at how well that works.
Great clips on the 465. Very through. I like to know what replacements you used for those large caps.
Thanks.
Awesome job Buddy.Loved it.My 466 should be about the same.I loved how steady the scope was.I might need to start cleaning switches and controls.73 from Ronnie kn4u.
Good luck on yours Ronnie. Great scopes. You will have a blast working on that one.
Great job!
Thanks
Once again you do excellent work! I remember the 465 from college and always wanted one with the digital voltmeter on top. BTW, on my 475, I though my power light was bad but that light was actually a LOW LINE indicator to verify you had the voltage selector correct. I wonder if it's something similar on the 465?
Thanks, they are great scopes. I checked the lamp and it is blown. Has voltage on it.
I should check mine (on the 475) also since it may not work and I would never know since it only comes on if the line voltage is low. If I open it I will probably want to replace some caps and fix the scratchy graticule illumination, and address the trace fade on the left side at higher sweep speeds.
Good Job...that Repair took some Sticktooittiveness! I just acquired a Tektronix 465B and it has a Horizontal issue. The Trace is Short of the CRT on both the Left and Right!?!? Looks like I could use some of your MoJo get this one back in shape :)
On the 1st switch cleaning , why did you use alcohol - instead of contact cleaner ?
Or when do you choose to one over the other ?
Thanks again
I chose IPA due to it being a sealed control. If it would had been a "serviceable" control then DeOxit.
its lovely
Incredible videos sir, and what a MASSIVE undertaking. I’m now subscribed to your channel. Perhaps, you could help me. Here’s the issue, I recently acquired Vu-Data portable oscilloscope [ps910b]: it looks great and it is very clean, inside and out. It seems to do well, with AC signals [I got this scope 2 weeks ago - haven't had time to play with it much yet] BUT when it comes to DC, I get the reference trace just fine, but the instant I place the probe onto, say a 1.5 volt battery, the trace which should move up vertically, instead disappears - so, I end up having to fiddle around with the +/- trigger to locate it. I do find it eventually but I don't think this is normal. I should point out, that I’m just an electronic enthusiast [without any formal training] and this is my first o-scope. It’s a small single channel scope, inexpensive, clean and it came with its manual [which is really more of a technical service manual - not a user-friendly instruction manual, and somewhat over my head]. I’ve fixed a few CRT TVs, few old radios, fans, etc, but nothing as complex as a scope. I don’t want to damage it accidentally. Frankly, I couldn’t even tell you if it’s a vertical control issue or an horizontal one... Please let me know what you think. Any insight will be greatly appreciated. Thank you kindly, in advance.
I would love to see how you replace the lights especially volts/division Chanel 1 and 2. The didn’t make it easy to get at them.
is not the power pilot lamp just to indicate low line voltage on these if i remember?
Good work. :)
Thanks Sue.
@ 31:42 my guess is C1559 or CR1559
Close........
How much ripple is acceptable on such a 5v rail?
As we know zero is the acceptable limit. However in real life that is not the case. I cannot remember off the top of my head for this scope but 100mv should be ok.
Just acquired a 465...plugged it in and I can hear High Voltage Arcing under the hood!?!?
That does not sound good. I would start by checking diodes and capacitors around the high voltage circuit. I know the capacitors are failing due to age of these units. So a complete recap would be in order.
The Radio Shop
The Plot thickens! I got a 465B a few weeks ago for $75...the Traces are too Short. A couple weeks later I found a 465 and 466 in a Junk Shop...got those for $20 Bucks each. The 465 is the one with High Voltage Arcing. The 466 is all White on Half the Screen. Then the other day I got another 465 off the Internet for $15! I've wanted a Scope my whole life...now in matter of weeks I've got 4 !?!?
You could polish up your understanding of transistor and op amp theory. When the regulator is IN REGULATION the + and - inputs on the op amp will be the same voltage. Get back to your books. Glad you are saving another precious 465.
So where's your YT video showing you repairing one of these? Care to share the link - you must know a lot from the books !
МАСТЕР😎👏👍👍
Buddy awesome video!! I have one that just started to blow a fuse when I turn it on. Do you still do repairs on these?
@ 16:00 that looks like AC mains leaking through.
Good eye!
While separating the trigger board from the main board how do you detach the white block pin connectors that are soldered to each board. Do they just clip apart?
They are a type of edge connector, you just pull the board out from them and it will expose the pins.
Dacke thank you, figured it out!
Hi Buddy. I sent you an email,letting you know it was on the way. did you grt it yet ?.
All my best.
Bobby
Bobby, Yes I got it. I replied to the email. Thank you very much
Thank you buddy I never got your reply. sorry. and you are very welcome.
All my best.
Bobby
9:05 one shot trigger?
Yes.
What's making that loud background noise?
98 degrees F outside. That is the air handler you are hearing.
@@TheRadioShop Thought that's what it sounded like. Good job on the 'scope.
I've always liked the 465 myself. Never found them too hard to work on.
11:50 Now you can work on the power supply.
Yep, the original problem :)
Fix the darn creek man.
Light was replaced since this video with a new one, It creeks too.
Ah, perhaps the diode popped.
That may have been that noise I think.
Part 2, too much background noise! Can't hardly hear what you're saying.