Hi,
On Saturday, February 4, 2006, at 09:39 am, Stuart Bell wrote:
On 4 Feb 2006, at 09:30, Kevin Clark wrote:
My G4 iMac 800 keeps blowing the mains fuse in the plug when I turn
it on at the wall. I'm turning on everything simultaneously as the
iMac and my 2 external LaCie firewire-connected drives (hard disc and
CD-writer) are on the same multi-plug block. Should I be turning on
the main power to these 2 external drives at a different time to the
iMac's power - i.e. before or after it? Could this be the reason the
iMac's fuse keeps blowing or might there be another reason I should
investigate? I've upped the iMac's plug fuse from a 3 amp to 5 amp
and now a 13 amp in the hope of making it more stable....did I do
right?
I fear it's a problem with the power supply of the iMac - nothing else
wold explain the fuse blowing.
Try JUST turning on the iMac - but I fear the result will be the same.
Stuart
A rule of safety with electricity is never upgrade the fuse rating to
overcome a problem. The blowing fuse tis telling you there is a problem
that will need sorting out.
Did the iMac ever turn on without blowing the original(?) 3A fuse?
If it did and now the 3A and 5A fuses blow then there are problems.
The 3A fuse should be more than ample (no pun intended) for the iMac if
that was the original fitting. That is the reason they put a 3A fuse
in. If the current flow was nearly 3A they would put in a 5A.
The fuse ratings are there to ensure the device is safe but that if
anything does go wrong the safety margin is not so great that a lot of
damage would be done before the fuse blows.
The fuse is meant to be the weakest link in the system.
I think there is something else wrong that will need looking into.
If you put in a 13A fuse and it doesn't blow then there is a big
current leakage of some sort, potentially up to 8A, and at 250V that is
a lot of power (2kW) that could be going astray inside your iMac.
Stuart Hart
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