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Old 16 September 2005, 08:08   #1
Seblington
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Problems with my Amiga 4000

Hello, I am new here but have had many years of experience with the Amiga computers, I have a A4000 which has been sitting in the loft for a few months, I was very happy with it as it was very clean. Not sure what happened, its probably due to heat but the front has started to turn yellow, is there any way of reversing it? I don’t mind a long way around but any help would be great.
Thank you
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Old 16 September 2005, 09:39   #2
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Have a look at this website. Do it by yourself. It is a selfmade page for the Amiga.
It's in Portoguese so you have to use the Babel Fish Translator
Maybe that will help you a bit.
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Old 16 September 2005, 12:27   #3
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Acetone and silicone..

Tell us how it went. Acetone basically melts the plastic when you wipe it, so be careful to get an even surface.
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Old 16 September 2005, 19:22   #4
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Hmmm, had a look at the site, didn't see much in the way of help, I don't want to melt the plastic, was hoping there was something a l;ittle safer I could soak it in
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Old 16 September 2005, 20:25   #5
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Anyway, what's wrong with a bit of yellowing. That is part of the Amiga charm IMO.
Hate it when people say on eBay 'Clean Amiga no Yellowing'. Have they never used their Amiga? Do they live under an Oxygen tent?
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Old 16 September 2005, 23:16   #6
Seblington
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lol, yellowing is part and parcel of Amigas but I love things to be in mint condition, this machine was in brilliant condition but I think it got too hot in the loft. I want to remember the things as they where when I first brought them and the Amigas where not yellow then
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Old 17 September 2005, 00:50   #7
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Quote:
Originally Posted by Seblington
I want to remember the things as they where when I first brought them and the Amigas where not yellow then
That's why mankind invented the camera.
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Old 18 September 2005, 11:13   #8
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Quote:
Originally Posted by Seblington
Hello, I am new here but have had many years of experience with the Amiga computers, I have a A4000 which has been sitting in the loft for a few months, I was very happy with it as it was very clean. Not sure what happened, its probably due to heat but the front has started to turn yellow, is there any way of reversing it? I don’t mind a long way around but any help would be great.
Thank you
http://www.atariarea.histeria.pl/for...ic.php?id=1664
http://www.atariarea.histeria.pl/for...ic.php?id=3174

Leave these parts in hot water for a half day. Then clean/scrub dry using washing-up liquid http://www.lobos.pl/sklep/images/pro...eam_maly_x.gif
 
Old 18 September 2005, 23:03   #9
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now thats interesting! i have some Cif so I am part way there, I have a microvitec monitor I can do a practice run on, does the warter need keeping hot for 12 hours?
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Old 19 September 2005, 09:03   #10
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Originally Posted by Seblington
now thats interesting! i have some Cif so I am part way there, I have a microvitec monitor I can do a practice run on, does the warter need keeping hot for 12 hours?
Keeping water warm profits during clean. Also adding liquid to 'bath' could help.
Half day is too much, one-two hours should be enough.

For lazy ones there is dishwasher

If result disappoints You then there is much better solution.
Find someone who works in 'jewellery workshop' and ask her/him to clean 'yellow dirt' using 'polish machine'.
 
Old 19 September 2005, 12:12   #11
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All these methods actually take a bit of plastic off the case. :-)

Even the polishing machine.

Basically there's no way of removing just the yellowing out of the case, since it's caused by the plastic's properties changing. You can refresh the plastic with acetone or you can polish a bit of plastic off the case, but sometimes it's impossible.

For example I have an 1541-II that's very yellow, almost brown. The plastic has turned totally brittle near at the ventilation grill, as the entire plastic has changed it's properties.
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Old 19 September 2005, 15:06   #12
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You could Tip-ex the case
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Old 21 September 2005, 22:45   #13
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I think I am going to buy another A4000, build a glass box and seal it away never to be used or seen again, therefore I will never know if it has gone yellow or not I wonder if anyone has a mold for it to make new fronts, I mean they must exist
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Old 22 September 2005, 20:44   #14
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If you don't like the yellow, paint it...

my A4000 (insides in a big tower) is yellowish, my A1200 is going yellow, both my A500's are yellow, however the CD32 is still black

Only way to stop it going yellow, is to put it in an inert atmospher in a UV proof box. Mind you, it'll be a bugger changing the CD or floppy....
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Old 22 September 2005, 21:08   #15
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Definitely paint it. Just don't do what I did years ago - apply a coat of paint by brush and without any primer.
Shops like Games Workshop should have some decent plastic primer spray paint.
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Old 17 January 2007, 22:58   #16
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Exclamation

Understanding problem - good article:
http://www.vintagecomputing.com/index.php/archives/189
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Old 18 January 2007, 06:49   #17
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@jope

I think your 1541-II is now past the point of saving *cosmetically speaking*.... (sad man )

@Seblington

the only option you have is to spray the item, use atleast 3 coats as an under coat ( a UV stopping coat is a good idea but consider that after the base coats) then finnish with a couple of coats and a laqure...

irony is Halfords has a good range of colours and have quite a close colour match too.... once done though keep you amiga away from sources of heat (like radiators) strong light and flurescent lighting as the plastic could still turn.


good luck
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Old 18 January 2007, 08:18   #18
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Quote:
Originally Posted by Zetr0
@jope

I think your 1541-II is now past the point of saving *cosmetically speaking*.... (sad man )
Yes, it's deteriorated all the way, no "white plastic" underneath. Thankfully I have five other 1541-IIs. ;-)

I wonder what the previous owner did to it, however. Was it left in the sunlight for a decade before getting to me? Perhaps the previous owner had some "greenhouse type" uv lamps for his plants. :-)
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Old 20 January 2007, 00:15   #19
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Thankfully I have five other 1541-IIs. ;-)
I've just spat coffee all over my keyboard!
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Old 20 January 2007, 00:49   #20
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well that will jump from white to brown bypassing yellow altogether, and without nicotine - the healthy way

I can recommend Parma Faskolor paints for R/C Cars try
http://www.microtechracing.com//prod...Name=AIR+BRUSH
for airbrush paints or
http://www.microtechracing.com//prod...Z&Name=AEROSOL
for rattle cans - flourescent colours any one ?
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