Thanks Clark. That puts my mind at ease, somewhat. Still don't know why this ADC box died twice--I guess I'll have to look for some other explanation. But with its innards replaced by the factory maybe the trouble is past anyway.
I read your response to someone else's query. You stated it was repaired twice, the first time it sounded like a component was replaced, the second time the whole board. A component failure on the board could have damaged some other part which after some time could have failed. So hopefully a board replacement will fix it for good. A lot of this type of equipment only has the single board so replacing it is equivalent to a new (or refurbished) unit.
Tom
On Feb 8, 2005, at 7:47 PM, Clark Martin wrote:
At 5:35 PM -0700 2/7/05, Tom Baker wrote:If you have a peripheral that draws its power from the Mac through a FireWire cable, can an overly long cable significantly reduce the power getting to the peripheral? I've got an analog-to-digital video converter box at the end of a fifteen foot FW cable that has died twice on me, and I'm wondering if that's why. This G-4 is also loaded with internal hard drives and cards that may be straining its power supply to begin with.
The long FW cable shouldn't adversely affect the Video ADC. From what I know of FW the supply voltage is not fixed. This means the peripherals are likely using a switching regulator to provide 3.3, 5, 12 or other voltages. Any voltage drop in the line would be compensated for by the regulator.
The switching power supply in the computer is overload protected so if that was a problem you'd know it because the whole computer would shut down.
-- Clark Martin Redwood City, CA, USA Macintosh / Internet Consulting
"I'm a designated driver on the Information Super Highway"
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