Adore these early ARM machines, they seem so much ahead of its time, and at the same time, very retro nowadays! Thank you very much for yet another great video sir!
Nice repair! I’m glad you went the extra mile and actually fixed the hard drive instead of being like "I’ll replace it with a CF card" like many people seem to do. PCB faults isn’t what people usually think about when a hard drive is failing, but here’s proof that it is not always the mechanical parts that goes wrong.
@@tony359 I love watching videos like this while repairing electronics. One major pickup is "common" is NOT "ground". You can blow up a scope input or probe with that thinking.
Always so much fun when you close the computer and it won't boot. I'm glad you got it working again and I hope that many people will get to play with it.
The "inductors" are actually just 0 ohm links, the single Yellow stripe is commonly used on 0 R links. They may well have created options for inductors to be fitted in those locations, perhaps for the US or somewhere with tighter emissions regulations but they just fitted links on this board.
Fantastic video Tony! Finally youtube shows me a channel that was made exactly for my taste. Amazing job catching and beating all those faults. Consider me a new avid viewer 😁
Don't know if anyone else has said this but I had an Archimedes A310 with what I assume was a version 1 ARM inside. I'm pretty sure this came out before the A3000 series and the RISC PCs (Still using ARM). 1MB RAM and one floppy drive. For the time a brilliant machine. I think it is still in my loft somewhere. At the time it cost over £1000 but I thought it well worth while. It could emulate a PC in software if I had to. The 'Arthur' operating system was 'interesting' but worked well enough until RiscOS came out. This was about the time that Amstrad brought out their early machines . Actually bought one of those for work because we needed an actual PC to run some proprietry software. No comparison! Enjoying your videos and catching up slowly.
I have little knowledge of the Acorn machines but I have to admit they are amazing for the time they were released! The A310 was still fitting an ARM2 - I read that the ARM1 was never released. I did a bit of confusion in the video, I wanted to say the ARM2 was the first ARM CPU released, not that the A3000 was the first ARM machine released! Glad you're enjoying the videos - and thanks for watching!
Wonderful Memories for me. Been there, done that. It loads the Roms in order, so it will try and give you a primary graphics-powered OS regardless of later errors. You left it as new. I just wanted to say that I'm so happy for you. Thank you.
It always makes me happy to fix things - this one is special as from tomorrow it's on display at the Museum and everybody will be able to sit down and use it! Thanks for watching!
30 plus years ago I read an article describing RISC OS 3 and I was blown away because it was way more advanced than Windows. In fact, I couldn't understand why we all weren't using it. Anyway, I eventually bought an R7500, which incidentally I'm actually using right now, although I'm posting this from phone. Anyway, I like your video as sooner or later I may need to do the same things you just did. So thank you for sharing. BTW, while FreeBSD is my main system these days, I still keep a RPi 400 dedicated to RISC OS 5.28.
Excellent stuff, and thank you. I was an Acorn dealer (Tower Electronic) in the late 80s and up to the mid-90s in Fyvie, a village in the NE of Scotland. I mainly sold the 1 to 4-slice Archimedes Acorn system for professional and serious hobby enthusiasts. Its Graphical User interface was way ahead of Windows at that time. They were all fitted with an Intel 486 co-processor and could run Windows 3 or (later) Windows 95 in a native Acorn RiscOS window. PS Not near the end, but the BIOS battery is toast?
Hi Tony. Have the very same computer, repaired for the very same problem. Thanks for the info on LK5 & D1 (1N4005 I guess), as I wasn't aware. Will fix mine following your guidance!!! It was described in the Service Manual (doh)...
The middle mouse button was the key to much more and contact sensitive located menues. A wonderful system where the menu comes to you and not the other way around as Windows is to this day.
These Acorn machines were very well architected. Never owned one myself but I’ve seen a few videos featuring them and it’s a pity they didn’t become more popular…
I am always fond of the Archimedes range - it was the computer range in my secondary school education, and my first job was supporting and upgrading Acorn and PC systems. The RISC PC with 486 PDU was brilliant, and it pleases me that ARM continues to this day. Nb you can get a modern RISCOS to run on a raspberry pi.
Of course we enjoyed it, as always. I wonder if it would be wise to cover the ROM's legs with a thin layer of some dielectric grease in order to prevent the corrosion from developing again.
interesting - wouldn't dielectric grease cause conductivity issues? After all it's very low voltage and very low currents. I really don't know, I'm wondering! Thanks for the feedback and for watching!
Hi great video, that was my last acorn having owned all the bbc models , now im repairing ps5’s with 16 Gb ram 🤗🤗👍enjoy your videos keep up the good work
Awesome video. I love videos where you go figure out what the problem is when it's not very clear. And this one is full of that! Don't get me wrong, I don't like seeing you suffer with computers that are so evil to continuously fail at you! lol
Thank you for the nostalgic video. I had several Acorn machines (from the early Atom up to a two slice Risc PC), The ROM set contains far more than the OS (it doesn't boot from de hard drive just from the ROM) so maybe the rom nr3 contains a part that is only needed for Apps or expansion Podules? I stil have som ROM sets here even with the first Risc OS 0.3
Thank you for watching! On the forums they told me the ROM cover the 32bit bus - each ROM is 8 bits. So it's not possible to run the system without one of the ICs as the data back wouldn't be complete. Weird, isn't it? :)
Very good video. Before You opened this FDD I was thinking that there will be rubber belt like in laptop Citizen drives which is always a piece od gunk.
Thank you! Someone mentioned that - the schematics say ‘L’ so I assumed they were inductors! Good to know if something goes wrong in that area! Thanks for watching!
@@tony359 we used them extensively in the 80's when double sided boards were expensive. Because of the body auto insertion machines could handle them easier.
One of the most enjoyable repair videos ever.....i was biting my nails throughout the entire video......How about putting in a 40mm cooling fan?.......😊
@@tony359 i believe its possible to mount a fan....it might get quiet warm since the power supply,the processors and hdd are all crammed into the system case....i am no expert but you can also try some stick-on heatsinks over the main chips...maybe use an infrared thermal camera to identify any overheating components?
Mas como deu trabalho este computador, hein! Que ótimo que deu tudo certo no final. Comecei comentar os seus videos conforme pediu, para dar mais visibilidade ao canal. Você trabalha muito bem, parabéns! Abraços do Brasil.
Thanks for helping giving visibility to the channel! And happy that you enjoyed the video. As far as I know the Acorn is still working at the museum :)
Still watching the video, but lets just comment - the standing RAM chips are called ZIP RAM (stands for Zig-zag Inline Package), and it is period correct for some late 286 and 386 era machines, so end of the 80s, early 90s. It wasn't used for a long time, but it definitely wasn't that obscure. Among others, the Amiga 3000 for example has the same kind of RAM on the motherboard as "Fast RAM".
Thanks for adding that to the conversation! That's cool, why Zig-Zag? I've never had an Amiga so maybe that's why I am not familiar with them. (That said I watched many repair videos so maybe I should have paid more attention LOL!)
@@tony359 Because the pins follow a zig-zag pattern? As I wrote, it's not just Amiga (and even from that, only the A3000 and some expansion cards, I think) use it, but I've seen 286 and 386 motherboards with the same (and compatible) RAM chips..
ZIP RAM was also commonly used on video cards from the late 80s and early 90s as it gave high capacities in a small footprint making it easier to fit on an expansion card.
You can find Seagate HDD in VERY old boxes - I believe the one in the ProFile is a Seagate! It sounds like a F1 car! :) th-cam.com/video/Vg4yNmrgVn0/w-d-xo.html Thanks for watching!
Some devices I work with have the ‘super capacitor’ - wondering how long it would last and how much it would cost? What capacity would you recommend? Thanks for watching!
depends on the current draw of the cmos... voltage wont make much difference..and a bonus is a capacitor obviously is made to accept and deliver current so can be recharged while system is on@@tony359
ive used these before KEMET 1F Supercapacitor FY 5.5V dc obviously higher than the 1v minimum (3v cell) but if cap isnt working at capacity itll hopefully last longer..@@tony359
If you want to get really preventative, you should bake a old board before soldering (24hr at 100C or so). Maybe not such an issue for PTH soldering but chips and SMD reflow can blister if they have absorbed moisture.
Oh I know! :) th-cam.com/video/omV1JJqiWAc/w-d-xo.html (Old video, sorry for the bad quality!) Baking is key for SMD. I now have a "dry box" were humidity is around 10/15%. I store a board I want to work on in the box for about a week, then I bake it. And it can still popcorn. I envy those who just blast 500C to a random board and claim they never had issues! :) Thanks for watching!
Oscillator looks perfectly normal. It will be a sinewave of a few hundred mv around 2 to 3v of dc offset. You won't be seeing a 3.3v square wave if that is what you were looking for.
oh no, it was the amplitude which was concerning me. But as you say, it's fine. Also I believe that just probing a crystal will change its shape? Thanks for watching!
Probably - I’ve been looking fo a big one for ages but I also have mixed feelings about that. I know some components don’t like that. But for such a damaged board it would have probably helped. Thanks for watching!
Well done with the final repair of the CMOS IC. I wouldn't have known to replace that. Is it an EEPROM IC? It probably can only be written to a limited number of times.
Good point - I am not very familiar with the difference but would an EEPROM require voltage to keep the data? This will wipe the data if there is no voltage. The datasheet says 240 × 8-bit low-voltage RAM. Thanks for watching!
Man that thing just wouldn't let you win. 😂 It would have been interesting to see the original RTC/CMOS chip tested in the socket just to see if it was really really dead. 🙂
What a strange hard drive fault. I'm genuinely curious how that could have happened. It's so hidden out of the way there. I wonder if something was splashed on it during manufacture? A bit of flux perhaps?
It's still close to the ventilation and that IC is facing up (but covered by the HDD) so maybe something spilled and corroded overtime? Weird indeed. Thanks for watching!
I used a old phone battery on my A3000. I thought they never got charged off the motherboard. I must of heard a video wrong. I was lucky to not get so much acid on the board. I had to replace the RTC chip to get it to boot it properly. It had been stored in a freezing attic for about 10 years. And the original monitor works ok.
it's been a while but I think I had 5V at the battery connector? I cannot remember if I checked or just trusted the schematics! :) Great to hear the monitor also works!
@@tony359 I`ve put a proper RTC battery with a diode in mine now. Yes there is 5 volts at the battery. I got a RGB to Scart cable to use the old TV but it`s just a white blank screen. Works ok on mono cable. I wonder if I need to put voltage into scart pins to get the TV to turn on RGB.
@@damianbutterworth2434 If I remember right the Acorn is a... analog SCART? Or digital? One that doesn't work with the more common scart. Like the Amiga maybe? I might be mistaken though. Did you check on the stardot forums?
on this Acorn Archimedes from 1989 ? a program called Lander - it had sound ? but todays Lander has no sound at all thanks............. do u know if Lander did have sound? thanks................
I'm not familiar with the Acorn family unfortunately but this video here th-cam.com/video/MNXypBxNGMo/w-d-xo.html seems to confirm there was no sound or very little! Thanks for watching! ** I am told that Lander is basically a technical demo which then resulted in a game called "Zarch". You should try Zarch instead!
theres a Fred Harris introduction video from 1989 which shows the Lander demo having sound ? its crazy but true have a listen to it (carefully listen to it) in the Fred Harris intro video thanks.................@@tony359
Great work and an entertaining video. Nice to see what was happening on the other side of all the WhatsApp messages! Looking forward to the museum visitors using it tomorrow!
Thank you! It's an old Aoyue which I wouldn't recommend to anybody :) The iron is a Hakko clone, the de-soldering gun is a clone of the many available online, nothing special with it and not so great.
Mine clogs too, the cleaning is done off-camera! :D But I believe it's kind of normal for those things. Make sure the gun is fully warmed up as the whole pipe must be over solder melting point. If you don't wait enough, the solder will solidify before exiting the metal pipe. It takes about 8-10 minutes to be at full temperature and I usually keep my gun at 420C.
use white vinegar to neutralize the acid from the battery. that will chemically remove the residue better then iso. use iso after to clean the neutralized brine.
Maybe it ist too late, but I suggest you make a dd image of that HDD as it is an ide drive together with the drive label, so it is possible to switch to an CF drive of something when the HDD really dies.
We've formatted it :) I understand that the OS is on the ROM - the HDD is only as extra storage. The unit belonged to someone so we didn't want any private data to be available to the public! Thanks for the feedback and for watching!
Great repair - what a stubborn machine :) It really tested your patience! Thanks for the shout-out!
shout-out well deserved! Thankfully it was not too stubborn! :) Thanks for your visit!
Adore these early ARM machines, they seem so much ahead of its time, and at the same time, very retro nowadays!
Thank you very much for yet another great video sir!
Thank you for watching!
Thanks for taking us along on this repair Tony.
Thank you for watching!
Nice repair! I’m glad you went the extra mile and actually fixed the hard drive instead of being like "I’ll replace it with a CF card" like many people seem to do. PCB faults isn’t what people usually think about when a hard drive is failing, but here’s proof that it is not always the mechanical parts that goes wrong.
Thanks! I was also a bit lucky on that one :)
Can’t believe I haven’t been to the Swindon museum. Even though I work there. I shall make a special effort next week to go. Thank you.
I might be there fixing things! If you ask for the curator, he knows me! ;) I am still getting to know the staff! I hope you enjoy the visit!
Happy the museum said "YES". Great job diag and repair.
Thank you for watching!
@@tony359 I love watching videos like this while repairing electronics. One major pickup is "common" is NOT "ground". You can blow up a scope input or probe with that thinking.
@@JeepinBoon Absolutely, I learnt that the hard way! :)
Did I make that mistake in this video? I am always happy to learn something new!
@@tony359 Not at all.
Awesome work as always!
I really liked seeing that demo floppy with the catchy beeps and bops.
ahah psychedelic indeed! :) Thanks for watching!
I liked the video and I like watching Tony's videos! Thanks Tony!
Thank you!
Never ever seen a CMOS failure. Wow. Well done.
This is one of my favorite of your videos. Love that machine!
Thank you! It's an impressive one indeed!
Sadly i only just found your channel but this video was a pleasure to watch, i look forward to watching the rest of your content 👍👍
It's never too late! :) Welcome and thanks!
Great repair. I really like the new capture layout too.
Thank you for watching and for your feedback!
Another great video of a computer that is not seen very often at all.. thanks
Thank you for watching!
Always so much fun when you close the computer and it won't boot. I'm glad you got it working again and I hope that many people will get to play with it.
ahah yes, it happens very often! I'm sure the A3000 is going to be under the spotlight for a little while! Thanks for watching!
Great repair Tony. It's one of those machines I dreamed about owning when I was a kid. I may have to take a trip to Swindon so I can play with it :-)
I am so impressed by that machine! It's going on display tomorrow! :) It's so nice to know that it's having such a noble purpose! Thanks for watching!
Great video, very interesting repair and well done for getting it up and running again, esp the IDE HD spot, don't think I would've seen that!
I was lucky :) Thanks for watching!
The "inductors" are actually just 0 ohm links, the single Yellow stripe is commonly used on 0 R links.
They may well have created options for inductors to be fitted in those locations, perhaps for the US or somewhere with tighter emissions regulations but they just fitted links on this board.
Good to know - I trusted the PCB which says "L" on them :) Thanks for watching!
Interesting machine and repair.
Even if it only was replacing sockets there is still sort of a history lesson in the video.
Indeed - but "nice" that something else happened! 😉 Thanks for watching!
Fantastic video Tony! Finally youtube shows me a channel that was made exactly for my taste. Amazing job catching and beating all those faults. Consider me a new avid viewer 😁
hey thank you and welcome!
The A3000 wasn't the first ARM machine Acorn sold - that was the A305/310/410/440 series
You’re correct and not the first one to mention! I mixed up the first ARM CPU with the first ARM machine! Thanks for watching!
Keep these great videos coming, I love them!!
Thank you!
Another great job! Thanks for preserving history
It's a pleasure! Thank you!
Amazing - love to see more on these ground breaking machines 🤩
Thank you - I hope I can come across another one (or similar) in the future! I know there is a 3010 at the museum which also goes on Supervisor :)
One of my favourite computers. Well done. A great repair.
Indeed a beautiful machine! Thanks for watching!
now this museum is somewhere i Have to visit! it is a tech geeks dream!!!
It is :) Thanks for watching!
Don't know if anyone else has said this but I had an Archimedes A310 with what I assume was a version 1 ARM inside.
I'm pretty sure this came out before the A3000 series and the RISC PCs (Still using ARM).
1MB RAM and one floppy drive. For the time a brilliant machine. I think it is still in my loft somewhere.
At the time it cost over £1000 but I thought it well worth while. It could emulate a PC in software if I had to.
The 'Arthur' operating system was 'interesting' but worked well enough until RiscOS came out.
This was about the time that Amstrad brought out their early machines . Actually bought one of those for work because we needed an actual PC to run some proprietry software. No comparison!
Enjoying your videos and catching up slowly.
I have little knowledge of the Acorn machines but I have to admit they are amazing for the time they were released! The A310 was still fitting an ARM2 - I read that the ARM1 was never released. I did a bit of confusion in the video, I wanted to say the ARM2 was the first ARM CPU released, not that the A3000 was the first ARM machine released! Glad you're enjoying the videos - and thanks for watching!
Just got this vid recommended all of a sudden! Great video, subbed to your channel!
Thank you and welcome!
Wonderful Memories for me. Been there, done that. It loads the Roms in order, so it will try and give you a primary graphics-powered OS regardless of later errors. You left it as new. I just wanted to say that I'm so happy for you. Thank you.
It always makes me happy to fix things - this one is special as from tomorrow it's on display at the Museum and everybody will be able to sit down and use it! Thanks for watching!
30 plus years ago I read an article describing RISC OS 3 and I was blown away because it was way more advanced than Windows. In fact, I couldn't understand why we all weren't using it. Anyway, I eventually bought an R7500, which incidentally I'm actually using right now, although I'm posting this from phone. Anyway, I like your video as sooner or later I may need to do the same things you just did. So thank you for sharing. BTW, while FreeBSD is my main system these days, I still keep a RPi 400 dedicated to RISC OS 5.28.
I agree that RISC OS seems very ahead of its time! But we all know how things work: VHS, Windows 95 etc :)
Thanks for watching!
Very interesting chain of repairs started by a killer battery!
Batteries are evil! :) Thanks for watching!
Excellent stuff, and thank you. I was an Acorn dealer (Tower Electronic) in the late 80s and up to the mid-90s in Fyvie, a village in the NE of Scotland. I mainly sold the 1 to 4-slice Archimedes Acorn system for professional and serious hobby enthusiasts. Its Graphical User interface was way ahead of Windows at that time. They were all fitted with an Intel 486 co-processor and could run Windows 3 or (later) Windows 95 in a native Acorn RiscOS window. PS Not near the end, but the BIOS battery is toast?
indeed a wonderful machine with a powerful GUI! BIOS battery? The one which exploded?
Thanks for watching!
thanks for the upload of this video most appreciated
Glad you enjoyed it! Thank you!
Great video, Tony 👍
Thank you!
Excelent work, as always!!!
Thank you!
Another amazing repair... and repair... and repair lol. Great work once again!
Thanks again!
Thank you for another great video ! Love the attention to detail. Keep up the good work !
Thank you for your kind words!
great video as always. Hope you can repair some more computers from the museum in the future. 3, 2, 1, go Tony359!
Thank you! One is already in the pipeline, watch this space!
Had one of these for a few years, end up being absolute money pits. Parts are stupendous now (providing it's not a small fix).
finger crossed! :) Thanks for watching!
Thank you for the great video!
Many surprises… 😮
❤
It'd be boring otherwise :) Thank you for watching as usual!
Hi Tony, wonderful and interesting video. When you fixed the HDD, I had warm feelings!
Always warm feelings when something is fixed :) Thanks for watching!
Very interesting repair. And, wow, I didn't know I2C had been around that long. Looked that up and it's been around since 1982.
Oh wow! I had no idea either! Thanks for watching!
The video is very well recorded thanks
Thank you, I appreciate the feedback!
Hi Tony. Have the very same computer, repaired for the very same problem. Thanks for the info on LK5 & D1 (1N4005 I guess), as I wasn't aware. Will fix mine following your guidance!!! It was described in the Service Manual (doh)...
So cool that those pads are there for us ready to use! :) Great to be able to help and thanks for watching!
Brings back memorys of my youth... i always wanted one of theses but could not afford one as a penny less student
Well, those were expensive machines back in the days! Computers were as expensive as cars! Thanks for watching!
Amazing video as usual Tony. Hope this helps to feed the algorithm! :-)
I hope so too! Thanks!
I loved how you blew the dust out of the floppy drive over the open PC so it went into the PC instead LOL
Yep, very clever of me! (ops!)
Great video! I have an A3010 that I need to look at!
Make sure the battery has been removed! I hope you can fix it!
The middle mouse button was the key to much more and contact sensitive located menues. A wonderful system where the menu comes to you and not the other way around as Windows is to this day.
I'm very slowly learning about this OS!
Ooh that PET 2001 at 0:45 was my first introduction to computing!
I hope I can repair one of them one day!
Awesome video! I enjoyed it a lot!👍
So happy you liked it! Thank you!
Nice! Another great repair.
Thanks 👍
Hah nice work, reminds me of high school - had loads of these in the computer room, I think they were A3020's!
I know the feeling, I had PS/2 at high school and that's why I got one too (also repaired on this channel if you're curious!). Thanks for watching!
Great vid.
The VIDC is also the sound chip btw.
ahhh, I didn't know that! Thank you!
We had a few of these in the school lab, they were surprisingly powerful machines, at least as good as the highend Amigas.
I can only agree! Thanks for watching!
Thank you! I enjoyed your video very much!
Thank you for watching!
Thanks for the amazing video
Thank you for watching!
These Acorn machines were very well architected. Never owned one myself but I’ve seen a few videos featuring them and it’s a pity they didn’t become more popular…
Unfortunately the most popular thing is not necessarily the best :) Thanks for watching!
Nice, keep up the good work!
Thanks, will do!
I am always fond of the Archimedes range - it was the computer range in my secondary school education, and my first job was supporting and upgrading Acorn and PC systems. The RISC PC with 486 PDU was brilliant, and it pleases me that ARM continues to this day. Nb you can get a modern RISCOS to run on a raspberry pi.
I should try the RISCOS on the Pi, I'd like to know more about it! Thanks for watching!
Well that was a fun adventure!
Yes, totally enjoyable! Thanks for watching!
Of course we enjoyed it, as always. I wonder if it would be wise to cover the ROM's legs with a thin layer of some dielectric grease in order to prevent the corrosion from developing again.
interesting - wouldn't dielectric grease cause conductivity issues? After all it's very low voltage and very low currents. I really don't know, I'm wondering! Thanks for the feedback and for watching!
Great repair and great video ;)
Thank you!
Great outfit Doctor!
LOL! Thanks!
Great video. Got yourself a new subscriber. Keep it up. 👍🏻
Hey Welcome and thank you!
Hi great video, that was my last acorn having owned all the bbc models , now im repairing ps5’s with 16 Gb ram 🤗🤗👍enjoy your videos keep up the good work
When you think at 4MB of RAM and compare it to 16GB... mindblowing! Thanks for watching! (also, repairing PS5 is not easy!!)
Awesome video. I love videos where you go figure out what the problem is when it's not very clear. And this one is full of that! Don't get me wrong, I don't like seeing you suffer with computers that are so evil to continuously fail at you! lol
ahah no, but it's nice to be kept entertained by subsequent failures! Thankfully they happened one by one and not all together!
Well done!
Thank you!
Thank you for the nostalgic video. I had several Acorn machines (from the early Atom up to a two slice Risc PC), The ROM set contains far more than the OS (it doesn't boot from de hard drive just from the ROM) so maybe the rom nr3 contains a part that is only needed for Apps or expansion Podules? I stil have som ROM sets here even with the first Risc OS 0.3
Thank you for watching! On the forums they told me the ROM cover the 32bit bus - each ROM is 8 bits. So it's not possible to run the system without one of the ICs as the data back wouldn't be complete. Weird, isn't it? :)
It was a proper repair video.👍
Thank you!
Great work
Thank you!
Great Work!
Thank you! Cheers!
Another great video.
Thank you!
Very good video. Before You opened this FDD I was thinking that there will be rubber belt like in laptop Citizen drives which is always a piece od gunk.
Oh it never happened to me, I've only saw videos where the belt turns into goo and I hope it will never happen to me! :)
Thanks for watching!
I´m still wondering how that goo reached the hard drive IC, that was weird! Great job!
Very weird indeed! Thank you!
Lucky you noticed the hdd. It's easy to forget even the simplest components can still have ICs fail.
I was happy to see such a simple fault :)
Hi Tony @ 6:50 you said inductors, they are actually zero ohm links i.e. a short or jumper link.
Thank you! Someone mentioned that - the schematics say ‘L’ so I assumed they were inductors! Good to know if something goes wrong in that area! Thanks for watching!
@@tony359 we used them extensively in the 80's when double sided boards were expensive. Because of the body auto insertion machines could handle them easier.
Ah the duality of diagnostic repair: find the obvious broken traces and corrosion and also find the stuff that looks perfectly fine.
It's never boring :) Thanks for watching!
wew, that's an interesting machine! Never heard much about it.
Neither did I until 3 weeks ago :) I could barely turn it on! :D Thanks for watching!
One of the most enjoyable repair videos ever.....i was biting my nails throughout the entire video......How about putting in a 40mm cooling fan?.......😊
thank you! Do you think a fan would be needed? I'm not familiar with that machine so I don't know how hot it gets.
@@tony359 i believe its possible to mount a fan....it might get quiet warm since the power supply,the processors and hdd are all crammed into the system case....i am no expert but you can also try some stick-on heatsinks over the main chips...maybe use an infrared thermal camera to identify any overheating components?
it would be an interesting project indeed! I'll check the temp of the case next time I'm close to it.
ARM1 only used in ARM Evaluation Board for BBC Micro
Mas como deu trabalho este computador, hein! Que ótimo que deu tudo certo no final. Comecei comentar os seus videos conforme pediu, para dar mais visibilidade ao canal. Você trabalha muito bem, parabéns! Abraços do Brasil.
Thanks for helping giving visibility to the channel! And happy that you enjoyed the video. As far as I know the Acorn is still working at the museum :)
Still watching the video, but lets just comment - the standing RAM chips are called ZIP RAM (stands for Zig-zag Inline Package), and it is period correct for some late 286 and 386 era machines, so end of the 80s, early 90s. It wasn't used for a long time, but it definitely wasn't that obscure. Among others, the Amiga 3000 for example has the same kind of RAM on the motherboard as "Fast RAM".
Thanks for adding that to the conversation! That's cool, why Zig-Zag? I've never had an Amiga so maybe that's why I am not familiar with them. (That said I watched many repair videos so maybe I should have paid more attention LOL!)
@@tony359 Because the pins follow a zig-zag pattern? As I wrote, it's not just Amiga (and even from that, only the A3000 and some expansion cards, I think) use it, but I've seen 286 and 386 motherboards with the same (and compatible) RAM chips..
ZIP RAM was also commonly used on video cards from the late 80s and early 90s as it gave high capacities in a small footprint making it easier to fit on an expansion card.
Now you mention, I think I have a 286 board with ZIP slots!
my biggest surprise was seeing a Seagate had drive in it didn't know they had been round so long
You can find Seagate HDD in VERY old boxes - I believe the one in the ProFile is a Seagate! It sounds like a F1 car! :) th-cam.com/video/Vg4yNmrgVn0/w-d-xo.html
Thanks for watching!
The computer of my school days, don't see too much about them these days
I didn't ask but I don't think they were sold outside of the UK (or not much) so they are pretty mysterious to me too!
my old computer, and the one I learned to program in ANSI C on
it's a very nice machine indeed!
you can also use a capacitor as a replacement for the clock battery... have done this a lot on fruit machine boards...
Some devices I work with have the ‘super capacitor’ - wondering how long it would last and how much it would cost? What capacity would you recommend? Thanks for watching!
depends on the current draw of the cmos... voltage wont make much difference..and a bonus is a capacitor obviously is made to accept and deliver current so can be recharged while system is on@@tony359
data retention uses 2uA at 1V which is the minimum the IC can work.
ive used these before KEMET 1F Supercapacitor FY 5.5V dc obviously higher than the 1v minimum (3v cell) but if cap isnt working at capacity itll hopefully last longer..@@tony359
it's an idea indeed. Thanks for that!
If you want to get really preventative, you should bake a old board before soldering (24hr at 100C or so). Maybe not such an issue for PTH soldering but chips and SMD reflow can blister if they have absorbed moisture.
Oh I know! :) th-cam.com/video/omV1JJqiWAc/w-d-xo.html (Old video, sorry for the bad quality!)
Baking is key for SMD. I now have a "dry box" were humidity is around 10/15%. I store a board I want to work on in the box for about a week, then I bake it. And it can still popcorn. I envy those who just blast 500C to a random board and claim they never had issues! :)
Thanks for watching!
Oscillator looks perfectly normal. It will be a sinewave of a few hundred mv around 2 to 3v of dc offset. You won't be seeing a 3.3v square wave if that is what you were looking for.
oh no, it was the amplitude which was concerning me. But as you say, it's fine. Also I believe that just probing a crystal will change its shape? Thanks for watching!
nice repair, do you think it would be worth putting through a ultra sonic to get the small bits of remaining green crud?
Probably - I’ve been looking fo a big one for ages but I also have mixed feelings about that. I know some components don’t like that. But for such a damaged board it would have probably helped. Thanks for watching!
Well fettled!👍👍
Thank you!
Well done with the final repair of the CMOS IC. I wouldn't have known to replace that. Is it an EEPROM IC? It probably can only be written to a limited number of times.
Good point - I am not very familiar with the difference but would an EEPROM require voltage to keep the data? This will wipe the data if there is no voltage. The datasheet says 240 × 8-bit low-voltage RAM. Thanks for watching!
Man that thing just wouldn't let you win. 😂
It would have been interesting to see the original RTC/CMOS chip tested in the socket just to see if it was really really dead. 🙂
Good point! I didn't think about that! Thank for watching!
Things seem to keep braking until we have a good video lol
Maybe, it's just that sometimes things keep braking regardless! :) Thanks for watching!
What a strange hard drive fault. I'm genuinely curious how that could have happened. It's so hidden out of the way there. I wonder if something was splashed on it during manufacture? A bit of flux perhaps?
It's still close to the ventilation and that IC is facing up (but covered by the HDD) so maybe something spilled and corroded overtime? Weird indeed. Thanks for watching!
I used a old phone battery on my A3000. I thought they never got charged off the motherboard. I must of heard a video wrong. I was lucky to not get so much acid on the board. I had to replace the RTC chip to get it to boot it properly. It had been stored in a freezing attic for about 10 years. And the original monitor works ok.
it's been a while but I think I had 5V at the battery connector? I cannot remember if I checked or just trusted the schematics! :)
Great to hear the monitor also works!
@@tony359 I`ve put a proper RTC battery with a diode in mine now. Yes there is 5 volts at the battery. I got a RGB to Scart cable to use the old TV but it`s just a white blank screen. Works ok on mono cable. I wonder if I need to put voltage into scart pins to get the TV to turn on RGB.
@@damianbutterworth2434 If I remember right the Acorn is a... analog SCART? Or digital? One that doesn't work with the more common scart. Like the Amiga maybe? I might be mistaken though. Did you check on the stardot forums?
@@tony359 I`ll keep trying mate. Thanks for the reply. I`ll search stardot now.
on this Acorn Archimedes from 1989 ? a program called Lander - it had sound ? but todays Lander has no sound at all thanks............. do u know if Lander did have sound? thanks................
I'm not familiar with the Acorn family unfortunately but this video here th-cam.com/video/MNXypBxNGMo/w-d-xo.html seems to confirm there was no sound or very little! Thanks for watching!
** I am told that Lander is basically a technical demo which then resulted in a game called "Zarch". You should try Zarch instead!
theres a Fred Harris introduction video from 1989 which shows the Lander demo having sound ? its crazy but true have a listen to it (carefully listen to it) in the Fred Harris intro video thanks.................@@tony359
Great work and an entertaining video. Nice to see what was happening on the other side of all the WhatsApp messages! Looking forward to the museum visitors using it tomorrow!
Really happy to see it on display today! Thanks for watching!
Great job!
EDIT: What de-soldering station are you using?
Thank you! It's an old Aoyue which I wouldn't recommend to anybody :) The iron is a Hakko clone, the de-soldering gun is a clone of the many available online, nothing special with it and not so great.
Gotchya. Just seems like it works well. Mine clogs after just a couple uses and it’s super frustrating.
Mine clogs too, the cleaning is done off-camera! :D
But I believe it's kind of normal for those things. Make sure the gun is fully warmed up as the whole pipe must be over solder melting point. If you don't wait enough, the solder will solidify before exiting the metal pipe. It takes about 8-10 minutes to be at full temperature and I usually keep my gun at 420C.
use white vinegar to neutralize the acid from the battery. that will chemically remove the residue better then iso. use iso after to clean the neutralized brine.
Thank you! It was done before but I did give it an extra wipe as you say. Thanks for watching!
Maybe it ist too late, but I suggest you make a dd image of that HDD as it is an ide drive together with the drive label, so it is possible to switch to an CF drive of something when the HDD really dies.
We've formatted it :) I understand that the OS is on the ROM - the HDD is only as extra storage. The unit belonged to someone so we didn't want any private data to be available to the public! Thanks for the feedback and for watching!