DC Controller Not Responding

[semicolo]

Yes a fuse has a resistance but very low, that's why i used the words "about 0" for the fuse resistance.

I remembered checking f1 and it was 0 ohms, I'll check again just to be sure (no need to be sarcastic :-)

And I meant that a bad controller could short the psu in case of jumping f1 (sorry for my english)

[ptr.exe]

Sorry, just my sense of humour

The F1 fuse has a resistance of 10 ohms, of that i'm sure.

Jumping the connection IMO wouldnt be dangerous at all, how likely is a faulty controller? and even if there was, there are many more resistors that would blow before the PSU, like in the main board.

[semicolo]

Well my dear ptr check again because I checked my 2 dreamcasts and ...
OH MY GOD 0.3 ohms !!! HOW COULD THIS HAPPEN

I LOVE when I'm right.

(in fact my ohmmeter showed 1.2 ohms for f1 and it shows 0.9 ohms when touching the probes, why don't have I the same lab material as the university's, sigh sigh)

[ptr.exe]

???

Let me check.

[ptr.exe]

lol.

You are indeed right.

I deserved the obnoxious response.

I checked my 4 DC's and found all F1 fuses to be near to 0.3 ohms accounting for error (0.4 ohms).

The truth is i never bothered checking in the first place just remembered at DevCast it said it was 10 ohms, me being lazy and not checking just meant i repeated what they said in a sarcastic manner.

This has been embarressing, and so this topic will now be promptly deleted, j/k

[semicolo]

errare humanum est

But really did you think of the voltage drop you would get if using a 10 ohms resistor ?
At 5 V, 100 miliamp you would only get 4V for the peripherals
and 3V at 200 miliamps ! that can't be, if you use 4 controllers with vibration packs, it certainly drains more than that, and controllers wouldn't work at 3V

I'll try to search fusing resistor datasheets, maybe some of them will make sense with the color codes we have.

[kgenthe]

Just twist the thing so the bottom prongs of the fuse touch. Easier than trying to sodder in a replacement wire or resistor.

[ptr.exe]

Easier but messy, if i had the problem i would desolder it and then make a solder bridge, nice clean connection and no wire needed.

[semicolo]

yeah but what would protect the psu or the motherboard traces if you've got a faulty controller ?

[ptr.exe]

semicolo, i seriously doubt that's any danger.

How likely is it that a controller has a direct short?

Anyway, the DC is pretty resiliant, ive shorted the PSU directly a couple of times before whilst building my MF DC, perhaps i should of been more careful the point is the psu and mobo were fine, nothing blew. btw, i shorted the +5v line via a dodgy internal VGA circuit that i should of checked first.