[ 本帖最后由 纪峰 于 2008-11-27 11:34 编辑 ]作者: 飞遍地球 时间: 2008-11-28 13:34
看你有没有办法让顾问说话，他一定知道作者: 纪峰 时间: 2008-11-28 18:38
顾问？顾问是谁？...............作者: 高级实用 时间: 2009-1-17 06:15
LZ换2501没有用.除非你能写入正确数据.
copy from web:
The "2501" was a DS2501 of 512 bit data space.
The data*** gives specifications to a max programming voltage after
EPROM write instruction of 12V. This means to protect the device from
overvoltage this zener diode connected to the pins must be a 12V zener
and the sereis resistor being a current limiter protecting the diode
in the event that the inner barrel and center pin were to come into
contact.
The DS2502 and 2501 (1kbit and 512 bit respectively) use Dallas Semi.
1-Wire (R) communication protocol. It gets its power from the data
line and when the data line is low a diode protected capacitor supplys
power for its logic circuits, Parasite Power. This means that to
communicate with the DS2502/1 one only needs two lines, a data line
(logic high idle state) and ground. The power to the data/power line
is supplied by the master through a 5k ohm resistor for short cable
lengths.作者: jinli 时间: 2009-1-17 06:20
现在的电源麻烦了，以后维修的电源也要改改了，不然修到象HP这样的板就麻烦了。作者: 寒峰 时间: 2009-1-17 14:11
我也想拆开适配器看看呢，就是无从下手！作者: 寒峰 时间: 2009-2-11 11:48 9#奕博
这样试有一定的危险。我的朋友就是测试的时候，有的电源适配器中心针带有电压，但是就烧毁了主板的充电电路了。
没有电压就不充电，CPU降频。有电压过高就烧主板！还是买原装的匹配。作者: 大修 时间: 2009-2-11 15:35
只要将市电插头接地脚悬空，电脑工作和电池充电都正常,这是什么道理
