This Beeb will self-destruct in 30 seconds...

discuss both original and modern hardware for the bbc micro/electron
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BeebMaster
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This Beeb will self-destruct in 30 seconds...

Post by BeebMaster »

Beeb 1:
ExplodingBeebs1.jpg
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ExplodingBeebs5.jpg
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Re: This Beeb will self-destruct in 30 seconds...

Post by BeebMaster »

Beeb 2:
ExplodingBeebs6.jpg
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ExplodingBeebs7.jpg
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ExplodingBeebs12.jpg
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Quite an average afternoon's destrution, really...
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iomanoid
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Re: This Beeb will self-destruct in 30 seconds...

Post by iomanoid »

Did it make that delicious "fupplefupplefupplewupwupwupwupspfffffff" sound too?
irrelevant

Re: This Beeb will self-destruct in 30 seconds...

Post by irrelevant »

Two machines in one day? You're pulling the stops out now, Ian!

Had a Master do that to me the other day .. first time I've had one happen and startled me more than a little until I realised. and yep, that's very descriptive of the sound it made, iomanoid, maybe with a few extra clicks thrown in.
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Re: This Beeb will self-destruct in 30 seconds...

Post by BeebMaster »

Yes, the popping sound as well, but I couldn't capture that as it had already happened!

The second Beeb was today, the first one was Friday I think. I'm currently working through the pile of 8 Beebs which have been in my room since about 2003 ready for going into storage, and it didn't happen till the fifth & sixth Beebs, which I thought was pretty good going.

It's happened to me many times, of course, but this is the first time the lids were off and the camera on hand at the exact moment.

I took a couple of videos as well, but they are just of the smoke clearing and they're a bit big to upload here (25MB and 80MB).

Is it something to do with a Beeb having been out of use for a long time? I've never had it happen on any of my regularly-used machines (fingers crossed).

I've also never had it happen to me with a Master, that is, apart from the time I was cleaning the case of one with hot soapy water and I obviously hadn't quite dried it fully before switching on....

Can somebody remind me of the benefit of changing whatever it is that has popped inside the PSU, since they still work afterwards. In fact, I don't even turn them off any more, just carry on!
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Re: This Beeb will self-destruct in 30 seconds...

Post by Test Pilot Monkey »

Maybe you just singed some spiders, or burned some bugs.
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Re: This Beeb will self-destruct in 30 seconds...

Post by BeebMaster »

Yes, I've always wondered that, but I think it is the caps exploding rather than some little hibernating insect being fried alive!

Having said that, I did observe something crawling out from under the PSU when I was photographing the second one, but it just turned out to be a speck of dust inside the viewfinder of my camera happening to move about a bit at the same moment!

These Beebs have been neglected for such a long time, though, that I have found a dead wasp and flying beetle inside them so far!
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Re: This Beeb will self-destruct in 30 seconds...

Post by BeebMaster »

Test Pilot Monkey wrote:Maybe you just singed some spiders, or burned some bugs.
Sorry, I didn't appreciate the lovely alliterative quality of this comment, very poetical!
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Re: This Beeb will self-destruct in 30 seconds...

Post by station240 »

BeebMaster wrote: Can somebody remind me of the benefit of changing whatever it is that has popped inside the PSU, since they still work afterwards. In fact, I don't even turn them off any more, just carry on!
Not having a room that smells like smoke perhaps [-X

That second one does have that nice ground fog effect you only get from expensive smoke machines though.
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Re: This Beeb will self-destruct in 30 seconds...

Post by BeebMaster »

The next Beeb has given off the smell quite strongly but no pop or smoke, so maybe it's threatening to go...
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Re: This Beeb will self-destruct in 30 seconds...

Post by retroclinic »

Can you see it crying out in terror on the screen...

No Clock...No Clock...NO CLOCK MAN!!!! :lol:
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Re: This Beeb will self-destruct in 30 seconds...

Post by BeebMaster »

That one is a suspected A-to-B upgrade, because all the upgrade chips (ICs 61 to 77) are socketed, and the two 6522s are different types. Apart from wild guessing, is there any real way to tell?
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Re: This Beeb will self-destruct in 30 seconds...

Post by iomanoid »

Messy soldering on the underside front ports is a dead giveaway.
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Re: This Beeb will self-destruct in 30 seconds...

Post by BeebInC »

Mine just did this :(
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Re: This Beeb will self-destruct in 30 seconds...

Post by BeebMaster »

Did you manage to film it though?
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Re: This Beeb will self-destruct in 30 seconds...

Post by station240 »

Only one solution, put a number of soon to be faulty caps in a big bank and video them.

Shame these are high voltage caps, otherwise my 240v to 2x alligator clips adapter would work.
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Re: This Beeb will self-destruct in 30 seconds...

Post by sorvad »

I'd be sending those pics in to Ivette Fielding and the most haunted crew, they'll be wetting their pants to show 'em.
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Re: This Beeb will self-destruct in 30 seconds...

Post by BBCB+64K »

I had this happen last night to my BBC B+ 128K. The original PSU that was in it started smoking after I bought it on ebay about 5 years ago, so I got my carer back then to swap out the PSU from my BBC B+ 64K and it has been working until 2007.

Last night my Brother got my B+ 128K out of the attiic and plugged it, after about an hour of using it smoke started pouring out of the keyboard and underneath the PSU. So my Brother immediately switched it off at the mains, unplugged it and put it outside in a dry place since the smoke was a strong smell.

I have bought a PSU like this one here http://www.giz10p.co.uk/Electronic-Part ... rod_3.html off ebay, I'm just wondering if 15 Amps on the +5v line would be too much amperage for the BBC's motherboard. Would it be safe to use it? I will be adding 2 disk drives to the PSU as well, so I'm assuming it would be ok to test it first before adding disk drives?

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Re: This Beeb will self-destruct in 30 seconds...

Post by retroclinic »

That PSU will work fine, but why not have the original ones refurbished? I do them, as do several other people. It's only one or both of the X2 caps that split and start smoking, and at the same time, it's good practice to replace the startup cap, and any others that look overheated or bulged.

Mark.
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Re: This Beeb will self-destruct in 30 seconds...

Post by broadcaststorm »

retroclinic wrote:That PSU will work fine, but why not have the original ones refurbished? I do them, as do several other people. It's only one or both of the X2 caps that split and start smoking, and at the same time, it's good practice to replace the startup cap, and any others that look overheated or bulged.

Mark.
I can recommend this service, Mark turned it around in good time for me (even over xmas).
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Re: This Beeb will self-destruct in 30 seconds...

Post by BBCB+64K »

retroclinic wrote:That PSU will work fine, but why not have the original ones refurbished? I do them, as do several other people. It's only one or both of the X2 caps that split and start smoking, and at the same time, it's good practice to replace the startup cap, and any others that look overheated or bulged.

Mark.
Hi Mark,

I do have several BBC PSU's that are in need of repair, and I wasn't sure how much it'd cost to have them all refurbished in one lot. I have 7 BBC B'S (including the B+'s) and 4 or 5 Master 128's. I will have to ask my Brother or Uncle to take out the PSU's when they have some spare time and send them to you to be refurbished.

Cheers,

Steve
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Re: This Beeb will self-destruct in 30 seconds...

Post by AndyF »

This happened to a machine that me and Jon W were looking at yesterday, it went with a very loud pop (louder than normal) :lol: , then the usual magic smoke.

Capkit soon then I guess (have whipped the PSU out for the moment and set it aside for further examination over the weekend to check nothing else is amiss)

It's been a while since I've had one do it though in front of me.
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Re: This Beeb will self-destruct in 30 seconds...

Post by andyt31 »

Just had this happen to my Model A. I knew it was going to happen at some point... :x
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Re: This Beeb will self-destruct in 30 seconds...

Post by AndyF »

andyt31 wrote:Just had this happen to my Model A. I knew it was going to happen at some point... :x
Was it the usual PSU or the early (black) linear one ?
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Re: This Beeb will self-destruct in 30 seconds...

Post by andyt31 »

Not a linear in this one.
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Re: This Beeb will self-destruct in 30 seconds...

Post by AndyF »

Ah OK :)

Was not sure if they would suffer the same 'fate' as the later ones, just curious really.

At least (the later ones, not looked at an early one) they are easy to fix or just obtain replacement.
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Re: This Beeb will self-destruct in 30 seconds...

Post by jimmy »

I can now join this club too :-(
My lounge currently stinks of caps that've gone bad. There was some smoke out of the back, but that smell lingers for quite a while.
It's odd how the BBC carries on as normal yet there's smoke coming out of it :shock:
This was a BSR manufactured power supply. My other (newly acquired) BBC is an Astec PSU. Is there a league of least-likely-to-pop BBC B power supplies?
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Re: This Beeb will self-destruct in 30 seconds...

Post by retroclinic »

A few later Beeb, and some Master PSUs had different X2 caps from the regular Rifa ones - I've not seen these type explode, but I do replace them anyway when doing a service.

What did make me concerned is having done a few Arc A4x0 refurbs now, the PSUs in those also had the Rifa X2s, exactly the same as the Model B ones. Yes, the PSUs are younger, but it's only going to be a matter of time before they start going poppie bang bang too.

Mark.
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Re: This Beeb will self-destruct in 30 seconds...

Post by sirmorris »

Here's one for BeebMaster - enjoy Ian!
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Re: This Beeb will self-destruct in 30 seconds...

Post by BeebMaster »

Been there, seen it, done it, got the third-degree burns...
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