January 1st 20, 06:00 AM
posted to microsoft.public.windowsxp.general
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External drive problem
Paul wrote:
KenK wrote:
Paul wrote in :
As long as the WinXP is a desktop and has two stacks,
you can gain the benefit of two fuses in parallel.
I ordered a USB 7-port powered hub from Amazon today. Hope it works. $30
Normally, these are green in color, and have a "notch"
on at least one end. That helps tell them apart
from any resistors.
https://www.digikey.com/product-deta...CT-ND/11205790
You have to check the dimensions, to see if it's an
exact replacement. That one is an 0805.
They also make huge ones.
https://www.digikey.com/product-deta...TR-ND/11205746
That one is 2920, 0.290" L x 0.202" W.
It would not fit on the lands on the motherboard
for the existing fuse.
Page 3 here, has the solder profile. The fuse trips from
the heat of soldering.
https://www.littelfuse.com/~/media/e...asheet.pdf.pdf
R1max = Maximum resistance of device at 20°C measured one hour
after tripping or reflow soldering of 260°C for 20 sec.
Because it uses a polycrystalline chemical, when it cools off,
new crystals form and it conducts again.
If you replace the fuse with a "copper wire", you lose fuse
protection, but you always have the power needed. If a short
develops in your external drive, the connector will then get burned.
Because the +5VSB on the PSU is only rated at 2 or 3 amps,
a second possibility is the computer will shut off if you
draw too much current, and that will be your "warning" of trouble :-/
The computer can't stay running, if the +5VSB gets shorted out.
It caused PS_ON# to be deasserted.
Paul
How neat!
I like components.
Will have to get a poly fuse to experiment with.
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