Hi check out what I saved from the dumpster. A classic Hewlett-packard none of this agilent, let alone keysight rubbish. 1740 800 Megahertz, dual channel analog scope Aha Beauty or CRO as we call it here in Australia Cathode Ray Oscilloscope and that's what I still call it here in Australia and I passed the chromate and thanks to Charles at Trio Test and Measurement who actually was I'm quite surprised he was going to dump it. but anyway, he says that it was, it was going to keep it but then it failed and they're moving shop and they really had to get rid of some stuff.

So he reluctantly decided to dump it but asked if I would save it from the dumpster. So I was more than happy to and look at this. it's a Bobby does like it works, but Joel said there was some weird stuff happening on the display. left it on overnight apparently and like it was working fine.

Then he left it on overnight accidentally and yeah, came in the next day and he thought he smelt something funny so maybe some magic smoke escaped or something. But anyway, it seems just fine and dandy. Check it out, it's a it's a Bobby Dazzler and it's an excellent NIC for the 1970s as well. Um, the manual is printed in 1976 which we have for it.

I'll show you and but it's still got a very sharp trace. There's no screen burning, everything seems to be working just fine on it. We trigger off channel B and we can actually get channel B hooked up here. Let's have a look I'm sure we can display B Trigger off B Bingo there we go.

Bob's your uncle? Look at that. So both Amb channels working, find the horizontals working, find the trigger. All seems to be working and it's got delayed sweep time base as well. so all the triggering seems to be just fine as well.

We can whack it in normal mode and there we go. It vanishes once we get outside the trigger window or in normal just roll. Of course when we don't trigger so everything looks like it's working just fine. We can turn on time.

let's try X 10 mag. it's working. There we go and it's an absolute winner. Can't fold it at all.

And of course, as usual with some of these things there we go for. Get in with the Vernier. You can see that it's all squishy and scratchy there. So yeah, we have to I have to clean that up.

In fact, that's not, in fact that one's not working at all. Yeah, it's a physical. Yeah, that's just dodgy as looks like Channel A is doing a similar thing. It's Jack.

Ah yeah, it's doing the business, but you tap on it and yep, it's It's all scratchy so we get in there with some. We can clean those up with some contact cleaner most likely, but the actual main vertical one doesn't seem to have any issues and the horizontal doesn't seem to have any issues. We've got our horizontal vernier that seems to work pretty well, so this is in fruits age. It's in amazing condition.

Well hang on. Something's started to go horribly wrong here. Well whoa, there was something I wasn't getting any response I was getting. You saw that horizontal law I'm sure you saw that horizontal line there on the display and then my vertical uh, position adjustment wasn't doing anything that was.

That was really weird. Hmm and it's done it again. It's done it again. I Was playing around with the delayed time-base here which is very nice by the way.

it's got the nice vernier control up here, separate trigger level. It's got auto as well, sweep, after delay, and manual. I Would let's try and reboot it. no reboot it.

What goal? Repair it? Hey there we go. We're in like Flynn no see Spanish in. Hmmm alright. hopefully I can show you this Hola Turn the intensity down.

you can see the highlight there. Okay, so it's got intensity and this is a this is what are we in. We're in auto trigger delay trigger mode. You can see our Vernie I can move that along so we can actually say zoom into that edge there.

and then we can use our delayed time-base Bingo! We've actually zoomed in to our time base there. And then we can do the auto mode where it actually jumps between the trigger points. Very very nice. I Like that.

that's a winner winner winner chicken dinner and this would have been a very advanced um scope. Well there we go. It's just failed. Look the horror.

The verticals gone, The verticals gone. But you can see how horizontals its jittering as something happen with the like jittering on the horizontal. Okay, well oh yeah, it's back. Oh yeah, this is this is one sick puppy I think Anyway, this is very nice how you can get the intensified delayed sweep mode.

You can never get that automatically or mixed mode operation and it's just yeah. it's it's terrific. This would have been really advanced back in the day, but check out what we got with it. The original operating and service manual.

This thing is pornographic. This is how you do manuals. This one's printed in August 1976 I don't know the original release date of this scope I Haven't done any research on it, but ah, we got into Principles of operation and you wait and see what we've got in here. Here we go.

So this is the operational part of it. We've got our specs and all that sort of jazz. But then we start getting into the AHA The centerfolds. Look at the centerfold.

Look at this. It's a. well, it's not even the centerfold. We're not to the center yet.

Um, but look at that are all the operational controls. Fan-freaking-tastic Wow Do you get that sort of stuff these days? Not in fold-out form? Geez, lucky if you get a bloody PDF that it's hard to got anything anyway. Not much and actually how to use the thing because, well, everyone knows how to use a scope, but principles of Operation looks straight into it. So basically the rest of this thing is all principles of operations, service, schematics, everything.

Billa materials, the whole work. So here is the theory of operation. Got ourselves a nice block diagram of how it all works. and ah, check it out.

This is how the complete theory of the main sweep and the integrator and how it all works. Wow With this fantastic bedtime reading, then we've got performance tests and adjustments if you want to do all that. Oh, it's just beautiful performance test records. And then here's the replaceable parts.

Here's inside. we'll take a squiz inside, no doubt. There we go. And so they're all fallouts and then replaceable parts.

We got exploded 3d diagrams at La God Little that, ah, my hat's off to whoever was it The drafts people at HP at the time who I did this, they would have had a whole drafting. Department You know, back in the day to do all that, look at the Bill of Materials Wow That's just insane. Manual changes. It's got the original Hey the original addendums.

There you go. Various changes. Here we go. but look at this component overlays, what else we got? Yes, how to take it all apart? Oh, and then of course we get into Tada.

The good stuff. There's the schematic. There's where I suspect might be an issue I'd be. you know, golden little troubleshooting.

thou shalt test voltages. But ah, so there we go. So I've just got basic art, linear stuff happening here. Nothing fancy at all, but there's our CRT driver.

There it is. There's our driver board with all the high voltage generation and everything else. Once again, we've got all the waveforms. all the test waveforms.

No problems whatsoever. What else have we got? Dave assembly. What's this? Here we go is. channel.

Is this channel A Here we go. Here's the important here is the input schematic for those scoped front-end fanboys. There we go. That's all.

Yeah. Jeff Ed Inputs are very typical for a you know, 100 megahertz, our bandwidth scope like we've got in here, this E or the input attenuation and that's interesting. They've got a is that like a custom chip to do as the differential? Our preamp look at that differential driver output. Oh well.

basically I'm You know, a single ended input there. There are ground reference there, but differential output drivers. and yeah, if they rolled their own custom chip there, that's interesting. I Thought this would have been almost entirely discrete, so that's that's.

rather fascinating. but as you can see, there's just a ton of stuff. There's a lot of things that go inside A You know, a Well, this is a reasonably advanced dual channel 20 mega F sorry dual channel hundred megahertz scope. You know it's got the delayed time-base in the auto and sweep and intensified modes and all that sort of stuff.

so you know it's it's a it's a fairly it isn't You know, pretty much as advanced as an analog scope got back in its day. So as you can see, there's no shortage of stuff. That means there's no shortage of stuff to go wrong as well. So yeah, hopefully we can do something with this puppy.

But yeah, there's the delayed sweep assembly. Whoa man. Beautiful. Just ah, beautiful.

Bed time ready I Love it! I Love it. Look at it all. Oh yeah baby! and there's all the inner connection diagram for all the boards as well. That fantastic what? Bobby Dazzler Well there it is.

It's been on for like an hour and it's doing this funny business. So I got ya and now I here we can see the bottom of the square I just had like the compensation square wave on there and no it's it's due real funny business so I'm not sure. not sure what the deal is there at all. um display Oh Looks like doesn't matter whether or we got with a what, Inb doesn't seem to matter, it's still doing still doing funny business.

So yeah, that's one sick puppy. let's pair it off and OOP oh you can still actually oh no I thought you needs to see the trace there. No, that's a reflection of the light. Sorry.

There we go. It's come good. Let's put it back over here and we're a nope, nope, no good whatsoever. So yeah, oh yeah, the position display doesn't even work anymore.

Wow There you go. So that is. That is one sick puppy. Beam find finds the beam.

No problems whatsoever. but horizontal works. There we go. horizontal position.

but it does not like, does not like that vertical at all. There's nothing. not a sausage, no vertical thing. so it looks like something possibly wrong with the vertical.

Well I know because they you just saw it. the horizontal was playing up - um hmm. interesting power supply perhaps. And here it goes again.

look at that. so that's sort of. you know. Ah, it's almost like a classic old power supply hiccup or something like that causing something to go away.

Look at that. Ah, that's hilarious. Wow I Like that. Check it out.

That's bizarre. Look at that. Hope that's showing up on camera. Yeah.

I think it is. Wow and if I disconnect this like it's still like actually measure doing something. Something's getting through the oh no, hang on No. I'm just I just disconnected the one kilohertz signal on Channel A.

There it's go to channel B Here we go. Wow Jeez, look at that. That's funny. something's going on I Haven't got Chop Mode on by the way, so it's nothing to do with the chop.

Um, and because if you don't know Sky old fashioned analog scopes, they have chop mode and alternate mode where they let the display go across once and draw a channel one and then draw channel two is alt mode. You put in chopped mode and then it actually has a high frequency chopper that chops between the two inputs at once. It does slow sweep speeds. It does that, so that almost looks like it had something to do with that for a second.

but hmm. wow. I've never seen anything like that. It's bizarre and if we turn the puppy off and turn it back on again, we might find that it's not-- hasn't come good.

It's got some other failure mode. No, no, not a sausage. so something. Siri going backwards.

Yay! It was like I swore that went backwards. did it? or was I imagining things I swear I'm not running this video backwards. Oh well, please do that again. Please come on.

That's hilarious. There we go we go. Hey Look at Swept-back so that's the UM What? I was going to say. It's like the retrace the CIT retrace but uh, it should be quick, not slow across like that.

It should be blanked, of course, not not visible. That's bizarre. and there's some more funny business after a while. I Push the beam fine like that.

I Think you'd probably be a bit foolish to initially start go trying to analyze this and trying to pick a you know a particular fault with it. You just go straight in. Check the power supplies. Off the bat because we're getting in a vertical issues.

horizontal issues. probably not the high voltage stuff because we're getting you know CRT operations so that's you know. And really, it's not like the HV is actually collapse down so it's still doing the business there. But so yeah, maybe a main power supply? That's that's a obvious first bet.

Anyway, let's crack her open. take a look for some visuals first, by the way, something that wasn't very common back in the day. It's got usual AC ground and DC coupling, but it's got 50 ohm input impedance R mode as well and you couldn't. Actually, if you just flick it like that, you couldn't accidentally go into 50 ohms and that is a safety feature so that you don't you know it, load down your line.

you've got to actually pull it out like that and then put it down like that and you can move it back. but you can't move it down. So that's very clever engineering someone was thinking. But if you asked me to nitpick about the design of this, look at just how small the font is it.

But you know it's hard to get a relative size here, but if you didn't have good eyesight, you know, like in is that 5 or is it 0.5 You know, like with decimal point is absolutely tiny. Look like I Can barely even see that on the LCD of my monitor in my camcorder here, so you know it really is quite small. But anyway, just a quick look at the back. Yes, we do have the very handy Z-axis input.

If you don't know Z-axis ascended, think of it as intensity modulation so you know X and Y on the screen and then Zed allows you to change the intensity of the displayed signal. That's a very handy for external stuff and how you can do those you know you scope demos and all those other real fancy graphical demos and stuff like that using the Z-axis input and it's also known as the blanking input as well because you know if you put digital into there instead of analog intensity modulation, you can essentially blank the trace out so we can. you know, draw fancy stuff on the screen and then not have all those trade and you know those trace and retrace lines actually show up and weave. Got both main and delayed gated outputs.

Fantastic and a couple of adjustments for the stigmatism on the screen and the trace alignment. Warning: Will Robinson Three thousand volts beneath this and tested by good Anya Robb Is it good on your Rob All right, let's lift her up. Just four screws on the top here. No workers don't have to do anything with the tilting bail which is really nice.

and Tada, we're in like Flynn Look at that. Ah, that's very neat and tidy. Wow Look at the yeah, look at these daughter boards. Beautiful.

Nice 10 turn pots in there that's very clean Look at that. Well, there's not a bit of dust inside this thing. It's really clean as a whistle. Wow Anyway, you can see the I of course love the the buttons coming back here on their extender arms there.

Look at that. There's not much bit flapping around in the breeze, there, not not any bracing on that edge of the board so you can maybe see the board move a little bit. but yeah, that's I Love these old school scopes. and of course you've got the horizontal here going back so you can probably see.

Should be able to see that there's our secondary time base. You can see that, like like something like a multimeter wiped. Contact that thing on the board down in there so it's actually on dual sides. I Can show you the other side actually.

There we go. so you can see that down in there. so there'd be some internal wipers in there and contacts. You should be able to see the stopper.

come around there and bingo, that's the end of the travel. That's for the delight. Delayed time-base setting it to be really easy to spray some my contact cleaner under there if you had to, but this one seems pretty good. and of course that is for the delayed time-base if you do the center one.

What happens? Well, there's our board for our So this would be our delayed time-base and our delayed sweep board. This would be our main horizontal time base port or horizontal time base election. The the main horizontal oscillator could be down on the main board there, but yeah, nice. Check out the heat sinks on some of the metal can packages.

They're old-school and there's our CRT shielded of course and no touchy. Now interestingly if we have a look at our main block diagram here and here's this like like ASIC chip I was talking about before for the differential preamplifier, front-end and driver. They call it a preamplifier substrate so that that to me implies some sort of maybe a ceramic hybrid module or something like that. and I Love the switch maintenance here.

Look, use the Freon degrees. A contact service should be lubricated with something from plate FML produced by the Fisk Brothers refining company. Does anyone know if they're still in business now? Tucked to right on the side of the CRT Here is this interesting looking board: I Believe this is the vertical output driver and look, they've got a HP ceramic device in there. Looks like a ceramic hybrid of some description and you can actually see contacts down in there.

Very interesting. Hmm. and packaged pin outs for the wind. There's a schematic for that vertical output board and that looks like our ceramic hybrid module down in there.

There we go. There's our plate, so it goes directly onto the plates as you can physically see over here and there we go. You can see that at the output of the board right smack on the back. There, it actually goes through the through the metal shield there wired right in there and goes straight in to the vertical plates, the vertical deflection plates.

There we go. And if you're wondering where our voltage mains voltage selection was, well here it is. down in here. They've actually got some a little switch and recess switcher right down in their hand.

We'll see that hopefully when we take this off. Tada. Ah, look at the access you get on this thing that is a thing of beauty and a joy forever. Ah, look at the layout.

Everything's accessible. All the controls are accessible. It's just this minimum of internal wiring. Ah, it's fantastic.

But check out our old-school caps around here. Hmm, well this stands out like a dog's hind leg. Look at them, nip on chemi-con cap in there. that's got like for all the world modern replacement written all over it, doesn't it? Hmm, just seems out of place.

Anyhow, if we have a look at our main power supply, look how accessible all this board is. It's just absolutely fantastic. We've got a linear transformer of course, one, two, three, four, five bridge rectifiers down in there, all our various filter caps and look at the beautiful wiring on our regulation pass transistors out here for our regulated rails. Fantastic.

Everything neatly cable tied and are the caps. our arm cable tied down and sits brilliant. And one thing on old products like this, be it scopes or anything else, always beware of our sockets like this. They were often very often not single wipe contacts ie.

only contacts on one side and they can get crusty and pitted and all sorts of stuff. so you might want to reset and thermal expansion can mean the chips can wear loose and stuff like that. So you want to want to go in there and give them, give them a push down and maybe even I get out your IC extract to take him out. Just inspect the pins, make sure there's no corrosion or anything like that, but these ones look brand new.

I Mean this thing could have rolled off the assembly line yesterday. Look at that National Semiconductor chip. Got some weird ass probably custom HP part number on it. Is that a date? 82? Perhaps ninth week? maybe? Not sure.

Ah, note: we have a date code. folks. there we go. 79 The 45th week 1979.

So this dates this scope to at least um, early Nineteen eighty. And there's a genuine factory botch. Look at that. Very nicely done.

There's tact this diode between the two pins of the switch. there someone went. oops, but fair dinkum. I Don't think I've ever taken apart such an old scope that's in such good physical condition.

There's not a little tiny bit of dust on there. It helps when these things don't have fans. Of course, there's none of that fan cooling rubbish. And the capacitors? jeez, that brings back some memories like that.

Mallory Brand? Yes, prog, no worries. I Can't say I've heard of a singer mo Hmm. and none of this Mu for micro are rubbish. that's genuine.

MFD Thank you very much. Fifty Three hundred Microfarads with a Big M at the Capital M and I've mentioned this many times. But I'll say it again. back in the old day when it made these scopes, you know, the 70s.

even in well into the 80s. Ah, there was no such thing as a Nano Farad. Nobody used Nanofarads. It was Eva Micro Farad's MFD right? and no actual Micro Mu symbol like you get these days.

It was that MFD Maybe because they had to actually type things you know and you couldn't get a muse symbol on a typewriter or whatever you know. So yeah, they say they use MFD Capital M. so it was even Micro Farad's or it was pico, Farads or Puff as its are called in the trade. So you know you would get a ten thousand puff capacitor where you get a point zero zero one micro Farad capacitor you'd never seen.

Anna Faris I Don't know about you, but I Just think that's just nicely engineered how they've got this plate and they've got all the adjustments under there and it's all nicely silkscreen and look. they've got to the trouble to put the heat shrink over here to keep those tidy. you look? they've got a little toroid. they're flapping in the breeze I Had to take the edge off something there, so they installed that afterwards.

But it's just all beautifully neat and tidy. And look at the spaces down here. keeping these wires a separated distance Is that because of a a capacitance thing they wanted? Uh, you know, a similar crosstalk is that like a differential output so they had to keep them a set distance. Oh Check out that gold-plated puppy down in there.

It looks like it's on a ceramic base with a gold top. He looks special HP branded and these output transistors. look at them. They've actually got connectors going directly onto the bent pins of the transistor that is I Don't know whether that's brilliant or whether or not that's date.

I Don't I like it though. I Can just imagine how easy it is to repair that. Jeez, you don't even have to stoke up the soldering iron. well.

How low do we have ourselves socketed Voltage regulator chips here? There we go. 45th Week 1975 RCA 1820 That'd be like a HP part number, no doubt. But look, are they. It looks for all the world like they're socketed.

if you get in there. yeah, you can certainly leave those up. Look at that. Wow Haha.

Metal cans socketed flush with the board. Fantastic. And here's another good example why it's not a bad idea to have a couple of multimeters lying around so that I can actually measure all the voltages are simultaneously. Because when you've got a fault like this um, it's you know it's good to see what's happening on multiple rolls.

You don't want to go probing around in there and around. And sometimes if you're working on high voltage stuff, it can be not be saved. So you want to go hands-off and set up the rig like this. You just want to be able to set it up so that when you've got a long-term failure like this that takes some time to materialize, you just want to turn the scope on and just leave it there.

And you know so that you can sit there and just monitor all the rails. So there you go: I Think we've got our five volts. we've got plus minus 15 volts. We've got 42 volts I think and this is 122 volts.

I Haven't powered it on yet. It's given a bill and see what we got. Make sure I've got none of them plugged into the amps Jack? foolishly? Nope. So let's say let's give it a go.

Here we go: Four Point nine. We got our five, we've got our plus minus. Fifteen will get out forty-two We've got our 121. Everything's hunky-dory There we go.

and we do. We have our trace the scopes upside down. all the electrons are going to fall out. Oh there we go.

We've got our trace up. Now we're going to do is our wait could take tens of minutes. could even take an hour before it does something. silly.

But yeah, you just want to work one of those voltages. I'll come back when it's doing something. see if there's any just any funny business. you always want to check your power supply voltages First first step for everything because I don't really trust these Doug dodgy old arm Sprague catch up with our fantastic quality back in the day.

but they've been in there since 1980, right? So they've been in there for like 35 years. So yeah, you know. Um, so when these things heat up the internal air so they could go, but you know, so it could be causing that funny business. Anyway, the only way to check that is to monitor the voltages.

I'll come back. Wellhow I swore I saw that drop down there I was just actually tweeting a photo of it and here we go. If you don't follow me on Twitter you probably should. If I can bloody expand that photo out there, we go.

look. drop down to 33 there, 96 there. ah 11. Ah, there we are.

No the plus might look three point nine volts tada. I capture just like as I was takin the photo but it's came good. it's come good again. So I think there's um, yeah, something wrong I'll wait until it goes funny business on the CRT here.

But I think we might have got something. Well, it's been on for well over an hour now and absolutely nothing. three of the meters have turned off and not a sausage. So since that initial little drop which I don't know maybe lasted a couple of seconds.

why coincidentally took a photo, it hasn't budged since. So I have we got thermal issues caused by the fact that we've got the case off? Now this actually happens. Murphy will get you every time, right? That you know, because we've got that lens off. Like the heats able to escape, it's not able to heat up as much inside as it normally would and it's also upside down.

So if this power if there was an issue with the power supply, then you know it normally be upside down. The heat doesn't really have much place to go. it's trapped inside the thing and you know. So I got annoying.

It's maybe time to our thermally provoked it and there's probably no point getting the freezer spray because if there is a thermal issue in here that takes some time to do it, it's going to be caused by heating up, not cooling down. If it's good, it's working fine. Cooling it down, it's not going to be a problem. it's not going to be I Doubt it's greatly doubt it's going to be a, you know, a joint somewhere, or maybe a socket.

You know it's not going to be probably not going to be a dry joint. a solder joint like you might get on BGA devices or something these days. So cooler downs not really going to help. You're probably clutching at straws there in this particular case.

I Think you're better off maybe going it over with a hairdryer perhaps? or a your heat gun and potentially trying to warm it up. But hey, just for kicks, let me spray some stuff. see everything's hunky-dory I don't know. spray some red, the board's spray some random chips out.

you know it's just it's just not gonna happen. So I'll try the old heat gun I've got it set to the lowest I Can go a hundred degrees and and we might just start to might just start having a look around shall we? I Have no idea if we're gonna get anything, but hey, it's probably worth trying at this point. So although what I suspect is Oh a lot of you might actually be screaming at me at this point as Dave It's probably not the linear power supplies. it could be something if you are paying attention in the schematics a while back.

I'll show you in a second what I'm talking about. It could be some sort of our current limiting happening further on inside this thing which is dragging down all the rails because you saw before like it was 3.9 These were dragged out of 12 and these are all basically all of them were down. So that's more indicative of you know, some other weirdness happening, potentially dragging them dragging them all down I Don't know, but we're not getting any luck there so it might not be a thermal issue. Of course that this is not extensive I'm not gonna do, were not gonna rule it out at all, but we've got nothing doing there at the moment.

And here's the schematics for the linear power supply and you can see you know we're going to stand up, redirect two fires. There is our main filter caps down there and then we've got some of these aren't regulator chips. you saw those in the sockets there and they've all got current limit, current sense in there you can see as they're our pass transistor mounted on the back. that's why it's got these socket symbols with a separate thing means it's mounted off the board as a current sense resistor and these are have current sensing in them and same over here.

We've got this one here, this one here all got our current limiting on them so maybe there's you know, something not inherent in the power supply somewhere else in this unit that's actually causing all of these rails to drop. So yeah, it seems to be a time-based thing. So whether or not its thermal, it heats up or whether or not it's electronic in some way or a combination. don't know.

But the thing is though, to bring all of these rails down and you saw, like all five rails, drop there to bring them all five down. When they're linear supplies it, you know it can't really can't see a mechanism where it could be an individual like line. Let's say, the 5 volt something was happening weird over on this board. some board over here that was powered from the 5 volt rail.

Then the current limit should just limit that rayo. It shouldn't drag down all the others. It's not like they're all linked together. Here's these three regulator chips here and they're all doing the same thing.

We're going to series pass transistor mounted on the back. They've all got their individual current sensing resistors and stuff like that. So why would the other one's over here? Drop the 42 on the and the 122 volt rails drop. It's almost as if like like the mains input over here was dropping.

So you know I wouldn't rule out a mechanism where maybe something in the power supply somewhere else is dragging down one of the rails and then it's causing a you know it's upsetting the one of the secondary sides here which is then affecting the primary which then. but you've got low impedance from the main, so it should. you know? Ah, it's just why would they all drop all of them all at once as evidence by that photo? but I cannot bloody well reproduce it? Hmm, it's extremely what rare. but perhaps the instant I took that photo, the mains dropped or something that would be that'd be a ridiculous coincidence.

The mains is rock stable around here, so yeah, but bloody Murphy get you every time. Well sorry folks, this thing is just not failing. It's near the end of the day and once it's probably been going like two hours now or something and it's just it's just is not failing at all. So yeah, I could probably put the case back on I don't want to leave it like overnight and run in and come back in the morning because Charles said that he did actually smell something.

So yeah, I don't really want to risk you know, the fire brigade being called or the lab burning down or whatever. So and yeah, it's a long shot, but hey, it's expensive if that alarm goes off. Yeah I can cover the center but you know. hmm um so I'm fortunate ly gonna leave it.

um call it quits there I know people hate this where I don't actually repair something like this but it takes time. and yes, I could sit on the video for you know until I get around to you know, actually solving this thing and fixing it. but then you know yeah I think it's good material its own right? I've got like it's been going like 35 minutes or something now. So anyway I hope you enjoyed that sort of tear down and first debugging and a little play around with this classic HP Scope and isn't it just gorgeous Lee Built I Love it.

Fantastic. Huge thumbs up! Anyway, if you liked it, um please leave comments and jump on over the forum and all that sort of stuff. Support me on Patreon, etc etc. Follow me on Twitter blah blah blah.

Catch you next time you.