How to repair Heathkit IO-4510 Oscilloscope Vertical Channel Part 2

Part 2 of the Heathkit oscilloscope restoration. In this video, I will troubleshoot and repair Channel 1 vertical input circuit. This is a vintage piece of test equipment. Back in the day, I would kill for one of these scopes. Now you can find them for peanuts. In a way, I like that, but in another, it makes me sad for the Heath company. What a great point in history. Plus, what a loss for our culture. Heathkit was not just about selling kits, however promoting a culture of common sense electronics. They were my elmer's. I followed their direction, formed me to the technician I am today. My goal was to be the goto electronics guy. They made it happen. I wish that I could go back in time, work at HEATHKIT!

[@jukeman57]

So gratifying to fix old gear and make it useful again. Used a lot of Heath Kit instruments in my career. Good job Terry.

[@msaradio7455]

I am a heathkit collector, I always love your ham radio/related video's. By all means continue with "those old things" :) .

[@ianbutler1983]

Thank you. Those of us who are learning from your channel will never ask why you are repairing an item.

[@georgethomas9436]

Oh WOW! I watched pt1 & pt2. Now can't wait for pt3 where your going to use a Heathkit calibrator. Really, thanks for sharing.

[@rciancia]

The moral of the story is learn how to read a schematic and anything can be fixed. Great Job as always Terry - you always nail it. !

[@d-labelectronics]

Thanks man, Its a great hobby, rewarding!

[@robertcalkjr.8325]

Thanks Terry! Great job! It doesn't look like anyone is going to complain about you eating and talking at the same time... Can't wait to see the Digi-Sizer!

[@shyleshsrinivasan5092]

You have got a style sir ! Thanks a lot for this video !

[@sam127001]

Very interesting to see you work through the issues on this gear !

[@SuperBuzzbomb]

Nice touch having that D-104 mike connected to the input of the scope!

[@tomk1tl]

I noticed that too ;-))

[@robertcalkjr.8325]

I noticed it also, but forgot to mention it.

[@kenhancock8931]

thx terry. hope you have a great day! great info for trouble shooting.

[@Pastormark1H]

Hoping you will do part 3 ! Very cool.

[@luigiamorini912]

Toca a por o meu osciloscópio Heathkit a trabalhar. The best videos from Heathkit repairs. Abraço from Portugal.

[@SIXSTRING63]

Great video as usual Terry. I just can’t figure why you don’t use a nice auto ranging DMM. I have and use some manual ranging meters but love my Fluke 189 and Brymen BM869s. Both can look at DC with AC components in the signal along with frequency, duty cycle, DB, VFD..............with dual display. Love them for quick checks you would have to use a scope at times to see. I love my old VTVM, Simpson and Triplett analog meters but can’t live without the newer meters with the features I mentioned. The mixed AC and DC signal feature is great for seeing leaky caps while running a test signal. I’ve heard you say in many videos you don’t like the auto range meters but I bet you’d dig the hell out of the Fluke 189 or the Brymen 869s. Watch Joe Smiths video of running these two meters through his torture tests. Keep the great videos coming. Always look forward to tube amp theatre. 👍

[@n8nkqrp595]

I agree in part... but will never get over my love affair in Biomedical Engineering when I met a trusty old Beckman Instruments 300. Our shop took over hemodialysis maintenance that's what the previous tech used. I laughed. Until I used it. it was simple, accurate, and fast. No crap that I would never use. The boss gave it to me, such was my love affair. It died. Beckman just sent me a new one for free... years later, no questions asked. I couldn't believe it. Alas, a thief finally got my 300. Time goes on. And i still miss my old Beckman.

[@rayvoorhies7180]

Very nice job. It's so satisfying to see an old scope brought back to life. Do you remember the 520B B&K transistor tester? I had one in the late 1970's. It beeped as the leads on the transistor were checked. Very quickly identifying the bad one.

[@bullwhipjohnson8247]

At the U.S. Army Signal School, I learned that if a transistor is PNP or NPN, you should have a high and a low and a high and a low from Base to Emitter and Base to Collector. Switching leads between B and C. Then again between C and E. Should be Open in one direction and mid-range in the other. A high and a low. 1 or Open. .500 or low.

[@RobertKohut]

Nice!! Sometimes when dealing with transistors you need to "draw the line".... LOL

[@meirionlloyd-jones7645]

White wine Terry?thought you preferred reds,ho ho? Have you tried Viogner(I think there are some Californian producers)its pretty good.Great video as usual chief!

[@bones007able]

People claim these are not worth 50 bucks... but I have the IO-4210...built it back in the early 80's ...I know is only a 10 mhz but it still works great and it is still useful for tracing signals and basic trouble shooting ... most hobbyists don't have the luxury of blowing big $$$$ on a good scope...

[@danielwoody865]

I like watching your videos, when is the Digi-sizer video going to be posted?

[@mcconja]

I have a scope where the vertical drivers seem to become saturated very easily . If I adjust the volts per division down, it starts clipping the peaks of the waveforms.

[@qzorn4440]

very nice repair... now to fix a heathkit io-101 vector-scope with no crt beam...Mmmm:/ this is a great how to video...:) thanks

[@paulmcclay8697]

Three years late, but because I just did this: it's not that hard to pull the vertical/Y input board. I agree it looks like a pain but I cheated and read the assembly manual backwards for clues. De-solder the signal connections from the center lugs of the three BNC connectors. The ground lugs for the Y input BNCs & neighboring switches are tack-soldered together and separate easily (if built per instructions). Pull knobs to expose & remove the nuts that secure the switch gear to the front panel. Pull the white/black "gate out" lead straight up to disconnect. Take a screw from each corner of the board and lift the back/inboard edge to disconnect from the chassis. Easypeasy. Reinstalling the board is complicated because it's impossible as designed. (Oops.) First poke the switch gear thru the front panel, then rotate the back edge of the board down onto the chassis connectors -- which would be easy if you were placing the board straight down onto the connectors but isn't because you're not. The assembly manual says to bend the chassis connector pins towards the back/away from the front panel sufficiently to allow the M pins on the chassis to get started into the F pins on the board. That probably won't make sense unless you're looking at what isn't fitting together. Rather then bend a bunch of pins (again - once 40 yrs ago was probably enough) I popped the front connector (+15V,...,MODE IN) back thru the chassis, installed the board, then pressed the connector into place through the chassis and straight into the board. In retrospect I'm not sure that's a better idea because it's a lot harder to mash the connectors straight through the chassis than to fit them into place one end at a time. D-lab's top-side repair looks like a sensible expedient for replacing one part. I'm in for replacing two tantalum caps that burned, plus all the tants that want to burn next, plus at least one resistor that burned before its tantalum friend gave up, and whatever else ain't right :-/

[@lambertax]

Just a question : why aren’t you beginning with the inputs instead of the final stages of the output of the verticals?

[@d-labelectronics]

Typical solid state amplifiers, you always start with the outputs and work your way back.

[@dhpbear2]

17:57 - Horizontal form-factor. The case width is greater than its height.

[@maxwarfield6699]

Great videos sir, I’m now subscribed to your channel. Perhaps, you could help me. Here’s the issue with my 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, cheap, 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.

[@micjam1986]

work on an old philco console radio...(47-1227) nos tubes installed, wax caps and electrolytic changed out, 90%resisters changed.. no sound but when im turning the tuning capacitor i get to a spot where i hear a tapping sound coming out of the speaker and as i continue to turn the tapping sound gets faster until it disappears.. sounds like a machine gun so to speak before it stops.. any idea what that might be?? anybody?...

[@apollorobb]

Nice Silver eagle

[@michaelchambers7691]

Bad transistors can very likely be due to outdated electrolytic capacitors.

[@daleburrell6273]

I USED TO HAVE ONE JUST LIKE IT!!!

[@sam127001]

a quick search tells me that $550 in 1974 is about $3000 dollars in 2018 !!!

[@faultlessguitarsandamps1116]

What snacks you got in that ramekin man?

[@Bleats_Sinodai]

That Digi-Sizer sounds like the "song" from CrazyBus...

[@d-labelectronics]

Yep, I built it back in the late 1990s. Plan to revive the project if there's enough interest

[@n8nkqrp595]

You're not D-Lab. You're my friend Joe S! Jesus you look like him. Act like him. Talk like him. Move like him. And yes- drink like him. Damn... a live doppleganger. Joe S... D-lab... thanks for the video. I didn't know that you knew anything about electronics, Joe. Electrical power distribution and Allen Bradley robotics, yes. Electronics? No! Huh. go figure

[@michaelchambers7691]

Heathkit should have used sockets in this oscilloscope.

[@daveogarf]

Scoperamus!

[@lelandclayton5462]

first!

[@coldfinger459sub0]

👍another great video. But the noise maker killing my ears 👂