Will it pop?

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paulv
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Will it pop?

Post by paulv » Sun Aug 05, 2018 7:49 pm

Hi Guys,

Long time no speak. :D

Today I made a start on clearing out the back room and looking to get it up and running as my hobby room again.

As some of you know, when I was diagnosed with Cancer, everything went into storage but a fully set up BBC Micro and an Archimedes were left out on the desk which was essentially buried behind all the storage boxes... That was three years ago this month.

Anyway, I finally got to the desk and tentatively powered up the Beeb. All was fine with it (and the 6502 second processor) but to my surprise, the CUB monitor showed a display immediately with no "warm up period"...

The monitor is sat in the Microvitec touchscreen adapter so you can't see the red power light on the front... Feeling round the back for the switch, I could feel the general heat of a well used monitor. Not roasting, just warm. So it seems it has been on continuously for the last three years :-o Given its age and the amount of time it's been on but idle, is there anything I should look out for now it's powered down.

I'm just wondering whether it'll go pop when I next power it up :-o I'm thinking dry joints and dried out capacitors.. Anything else to worry about?

Should I "exercise" the caps by powering up and down for short periods 1-5 mins and lengthen the times gradually?

Paul

P.S. Don't tell Tracie, she'll have a fit if she finds out that it was left on for three years!!!!

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trixster
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Re: Will it pop?

Post by trixster » Sun Aug 05, 2018 9:05 pm

Welcome back! Hope you are well :)
A3020 | A3000 | A420/1 | BBC B + 128K RAM/ROM + 20K Shadow + Pi0 + VideoNuLA
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paulv
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Re: Will it pop?

Post by paulv » Sun Aug 05, 2018 9:25 pm

I'm good... I'll be 3 years all clear this October.

I have an awesome new selfie too :D
Pelvis-2018-sml.jpg
Paul

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1024MAK
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Re: Will it pop?

Post by 1024MAK » Sun Aug 05, 2018 9:51 pm

Welcome back to Acornville and Beebland :D

I glad that you are doing okay 8)

Err, I feel a bit boxed in on this... (sorry :lol:) If I say it will be okay, it may not be!

At my workplace we use monochrome CCTV systems, the CRT monitors typically run 24 hours a day every day (although there is always a standby monitor, so the operator may switch between them, meaning that one monitor may not be used all the time). But typically one gets prefered over the other, so in practice it's not uncommon for one to be on all the time. All other electronic systems run continuously 24 hours a day, 365 days a year, year after year. This includes rack mount PCs.

So if the Cub was working okay before you turned it off, there is a good chance that it will be fine when you switch it on again. As long as electronic equipment has been properly designed, it should have no problems running continuously. And in fact with things like CRT displays and power supply systems, the most stress it will experience is at switch on.

Electrolytic capacitors age quicker, the warmer they are, so you may well have reduced their lives a bit. But if it does work okay when you switch it back on, I would not worry. However, when you do have time (assuming you are good with a soldering iron) it may be an idea to renew the electrolytic capacitors.

I would not do the switching cycle you suggested, it's more likely to do harm than good. Just use it as normal.

Have fun :mrgreen:

Mark
Last edited by 1024MAK on Sun Aug 05, 2018 9:54 pm, edited 2 times in total.

steve3000
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Re: Will it pop?

Post by steve3000 » Sun Aug 05, 2018 10:11 pm

Great to see you back Paul, and nice selfie!

Not sure about the effect of three years continuous use of a CUB monitor, but as Mark says, it's the switching on/off which places most stress on these, so hopefully it'll be good for many more years.

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jgharston
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Re: Will it pop?

Post by jgharston » Sun Aug 05, 2018 10:23 pm

Good to see you back. I'm tempted to change my avatar as well.

Before:
(throat - ick)
After:
(throat - ouch)
Last edited by danielj on Mon Aug 06, 2018 6:50 am, edited 3 times in total.

Code: Select all

$ bbcbasic
PDP11 BBC BASIC IV Version 0.25
(C) Copyright J.G.Harston 1989,2005-2015
>_

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paulv
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Re: Will it pop?

Post by paulv » Mon Aug 06, 2018 5:36 am

Thanks all :-)

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danielj
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Re: Will it pop?

Post by danielj » Mon Aug 06, 2018 6:42 am

jgharston wrote:
Sun Aug 05, 2018 10:23 pm
Good to see you back. I'm tempted to change my avatar as well.

Before:
(throat - ick)
After:
(throat - ouch)
Oh gosh, poor you :( - I hope you're well on the road to recovery. That's 3 people I know now how've had this over the last 3 years, and the treatment is quite brutal. I've deleted the pictures simply as they were quite graphically biological and I know people (myself included) can get squicked out by images like that.

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1024MAK
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Re: Will it pop?

Post by 1024MAK » Mon Aug 06, 2018 8:13 am

@Daniel - time to add spoiler tags?
Don't know if you can hide pictures in a spoiler though.

Mark

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1024MAK
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Re: Will it pop?

Post by 1024MAK » Mon Aug 06, 2018 8:14 am

@Jonathan - that looked horrible. I hope everything is now sorted and that you are okay now.

Mark

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danielj
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Re: Will it pop?

Post by danielj » Mon Aug 06, 2018 8:41 am

1024MAK wrote:
Mon Aug 06, 2018 8:13 am
@Daniel - time to add spoiler tags?
Don't know if you can hide pictures in a spoiler though.

Mark
Attachments always show up. It's probably best to leave graphically medical imagery to medical fora. Scans/x-rays are abstract enough to not be particularly graphic.

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Re: Will it pop?

Post by Boydie » Tue Aug 07, 2018 10:50 am

The before photo did look strangely appropriate for the thread title...

Paradoxically, if you’re used to looking at them, the scans are actually more disconcertingly graphic than the photos!

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jgharston
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Re: Will it pop?

Post by jgharston » Tue Aug 07, 2018 4:36 pm

1024MAK wrote:
Mon Aug 06, 2018 8:14 am
@Jonathan - that looked horrible. I hope everything is now sorted and that you are okay now.
Just had the follow-up appointment today. Biopsy is negative - "just a lump". Whoo hoo! I can have me hair cut. :)
Though the operation revealed I've got high blood pressure (BP 187/106 resting), so I'm now on daily Angiotension Conversion Enzyme Inhibitors on top of my weekly PPIs (not them, Proton Pump Inhibitors). Seems I'm pumped full of inhibitors, no wonder I can't get out of bed in the morning. :?

Code: Select all

$ bbcbasic
PDP11 BBC BASIC IV Version 0.25
(C) Copyright J.G.Harston 1989,2005-2015
>_

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