http://www.blogger.com/blogger.g?blogID=1840459474737789074#editor/target=post;postID=2458390805831201608
Now I have mounted the PSU and the GPIO router board on the rack mount chassis base board.
I have used the test programs to make sure that the test LED, buzzer, and button echo progrograms are working OK. However, I found that the buzzer is weak, barely audible. I suspect that earlier I made a careless mistake of making a wrong polarity connection of the GPIO pin connected to the buzzer. Perhaps that particular pin is damaged.
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