Hi James, My MacBook Pro, has 3 USB Ports. The one I mentioned below is the High Speed USB Port 'Built-in iSight'. This Port has 500 (mA) Current Available & 500 (mA) Current Required.
The USB Port - Apple Internal Keyboard / Trackpad / IR Receiver has 500 (mA) Current Available & 40 (mA) Current Required. The USB Port - Bluetooth USB Host Controller has 500 (mA) Current Available & 0 (mA) current required. This is your field, I don't profess to understand it, I was only pointing out that "All USB Ports are Not Equal". Cheers, Ronni On 17/01/2010, at 9:06 AM, James / Hans Kunz wrote: > hi Ronni > 500ma av & 500ma req that's really is a tight fit so i'm not suprised if > there is a on/off/on/off effect...... > the required power should be clearly below of what's available for reliable > steady work & you say "at least" which would confirm that my guess is right, > then in the beginning of the charge cycle any charger take more power then > towards the end of a cycle > James > > On 16/01/2010, at 16:39, Ronda Brown wrote: > >> >> Hi James, >> >> This is why I suggested to Kevin to check in System Profiler all his USB >> ports. >> System Profiler will show him what the Current Available, Current Required & >> speed. >> Similar to this: >> Current Available (mA): 500 >> Current Required (mA): 500 >> Speed: Up to 480 Mb/sec >> >> The iPod Touch requires at least 500 mA for proper charging as well as >> voltage within specification. >> >> Cheers, >> Ronni >> >> On 16/01/2010, at 4:25 PM, James / Hans Kunz wrote: >> >>> there is a strong possibility that the usb port you are using delivers only >>> 100ma which is not enough for recharge, it has nothing to do with speed >>> only with the 5v power coming out of the usb, "high powered" equipment >>> (chargers, harddisks) should not run directly of a usb port any >>> way......(if you overload the usb port shuts down) a external!!!!powered >>> usb hub could be a solution aswell >>> some dark world pcs front give you the same trouble & if you connect to a >>> backside port all is fine >>> try all usb ports i'm sure one gives the power for your recharging >>> James >>> >>> On 16/01/2010, at 11:25, KEVIN Lock wrote: >>> >>>> >>>> My wife's new iPod Touch will only charge using USB on her MacBook, not on >>>> our iMac. >>>> >>>> I have tried different USB ports, a powered hub, but no go. Both >>>> machines are running 10.4.11 with plenty of RAM. >>>> >>>> Not a big problem, but it is interesting...any ideas for me? >>>> >>>> Regards >>>> >>>> Kevin -- The WA Macintosh User Group Mailing List -- Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> Unsubscribe - <mailto:wamug-unsubscr...@wamug.org.au>
