Discuss modifications you have done or plan to do to your Dreamcast or any other hardware, or discuss devices you want to build. If your console does not work or is acting up, ask about fixing it in here.
LyingWake
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by LyingWake » Wed Aug 31, 2005 5:57 pm
On a working resistor, these are what the colors look like to me going from top to bottom:
Oragne
Blue
Yellow
Silver
Silver
Blue
BuddyJ
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by BuddyJ » Thu Sep 01, 2005 12:58 am
Weird. On mine (PAL-E, Revision Number 1)
the colors are:
Brown
Orange
Black
Gold
as far as i can see it in the half-darkness
Edit: Changed yellow to Gold, last time I couldn't see it evry well...
Last edited by
BuddyJ on Mon Sep 05, 2005 7:37 am, edited 2 times in total.
LyingWake
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by LyingWake » Thu Sep 01, 2005 1:35 am
Incase it matters, mine is an NTSC-U.
Alexvrb
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by Alexvrb » Thu Sep 01, 2005 4:20 pm
They probably used random colors just to confuse you.
If you have twenty monkeys,
banging randomly on typewriters,
they will in twenty minutes produce the complete source code to World of Warcraft.
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by semicolo » Fri Sep 02, 2005 3:36 pm
I don't think that's random colors, I've seen in datasheets that constructors of fusing resistors seem to use different color codes
and so we have f1 with 4, 5, or 6 colors quite challenging !
I'm considering hooking a psu to a working f1 and blowing it by increasing intensity, but I don't have a good lab psu at hand for the moment.
Alexvrb
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by Alexvrb » Sun Sep 04, 2005 5:45 pm
I wasn't being literal.
If you have twenty monkeys,
banging randomly on typewriters,
they will in twenty minutes produce the complete source code to World of Warcraft.
semicolo
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by semicolo » Mon Sep 05, 2005 2:04 am
Do you know any other good method ?
Alexvrb
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by Alexvrb » Tue Sep 06, 2005 10:53 pm
What? I was saying I was not being literal when I said they used random colors.
If you had really precise lab hardware you could find when it blows, yes. Or at least get close enough to get a suitable replacement.
If you have twenty monkeys,
banging randomly on typewriters,
they will in twenty minutes produce the complete source code to World of Warcraft.
semicolo
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by semicolo » Wed Sep 07, 2005 6:43 am
Sorry I thought you were the one saying "blow it"
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by semicolo » Mon Sep 19, 2005 11:34 am
Assuming the readings are
orange white silver silver green
according to this page
http://www.koaproducts.com/english/cata ... RF25_C.htm
those fusing resistors use a blue coating and a green color band for identification, this would give us
39 * 0.01 10% = 0,39ohms 1/4W
It can handle up to 800mA without blowing and more for short time, voltage drop at 0.8A = 0.3V so the 5V would read 4.7V for the controllers, which should be ok
This makes sense, I'm still searching other datasheets for the other f1 markings.
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by mikozero » Mon Sep 19, 2005 3:01 pm
nice work, keep it up
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by Alexvrb » Sun Sep 25, 2005 8:47 pm
Yeah, keep us posted if you dig up more.
If you have twenty monkeys,
banging randomly on typewriters,
they will in twenty minutes produce the complete source code to World of Warcraft.
semicolo
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by semicolo » Wed Sep 28, 2005 11:40 am
I've seen other datasheets telling they use a fifth yellow ring to indicate fusing resistors.
could everybody post their color codes ? it's easy, just open the dreamcast and f1 can be seen.
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by semicolo » Thu Sep 29, 2005 7:43 am
those having an ohmmeter, take f1's value in the same time to be sure it's very low, below 1ohm.
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by semicolo » Sat Oct 01, 2005 8:51 am
My two dreamcasts have the 0,39 ohms resistors (orange white silver silver green).
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by LyingWake » Sat Oct 01, 2005 1:21 pm
So, would it be safe to say (if there are any out there) that a 1 ohm resistor would be a pretty close replacement?
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by mikozero » Sat Oct 01, 2005 6:07 pm
you should be able to find 1/2 ohm resistors which would be closer,
but the thing is these won't blow when nesseccery,
it could maybe be better repaced by a fast acting mini fuse holder (or even a resettable mini breaker).
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by semicolo » Mon Oct 03, 2005 10:57 am
problem is we still don't know if these are 1/4W, 1/3W or 1/2W
safest bet is to use a 800mA fuse, but I would use a slow fuse, since fast acting won't allow short transients.