加拿大外贸
如题谢谢大家了~~~~~~~~~~
The diode should be put across the coil at the relay with the “line” side of the diode on the positive terminal. This allows the energy built up at the coil (when it is energized) to be released at the relay when it is de-energized instead of being transmitted along wires that are connected to the coil. This not only protects the device driving the relay coil from getting this energy (not a problem here since it is just a key switch), but it also reduces EMI generated on these wires, which seems to be the issue here.
A little more investigation yesterday seems to confirm that EMI is the problem. All the tie wraps holding the wires/USB cables under the hub were undone and we ran a separate 79 and 22 wire to the key switch. Without the diode on CR13, if we held the 79 and 22 wires close to any USB device cables at the pod (keyboard, trackball, and/or joystick) while turning the maintenance key on/off repeatedly, it would cause that device or other USB devices to eventually lockup (sometimes just for seconds and sometimes until a reboot).
[ 本帖最后由 Namiko-zs 于 2011-10-10 11:29 编辑 ]
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= = pls give me a hand～～～～～～～
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水清洗机……
加拿大电商刚从事这行半年，对电子行业不了解，自己整理了些，算是学习，供大家分享，也请大家补充。我毕竟是个文科生，对这方面知识严重欠缺。 DVD:英文全名是Digital Video Disk, 即数字视频光 加拿大电商昨天我把提单复件发给了客户，今天收到了他回信，如下： Dear Nicholas, please send all shipping documents. We will check B/L copy and we will reply ASAP. Thank you Best Regards .........................................
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