Sjouke Burry said:
Mice. Two couplers in each of them.
I have an old mouse I couldn't bear to throw out, even though it didn't
work and the piece that holds the ball in place got lost. I kept thinking
that someday I'll learn something about it. It's a Hewlett-Packard with S/N
(serial number) 50C5806 and P/N (part number?) 5183-9012 Rev A and
M/N (duh?) MO15K. I couldn't find the screw to open it up and decided to
resort to force it open with a screwdriver. Eventually, I saw a kind of
cylinder bending and realized that that must be where the screw was housed.
Then I remembered that someone here once told me to look under labels for
hidden screws and, in fact, it was under the label with the information I
The mouse has a kind of track wheel which I find works very well as
a top. I removed the board, which automatically left the interrupter
wheels behind. The opto-isolators are on the board. There are two of them.
Also, 3 pushbutton switches, even though the mouse only has two buttons.
There is a chip on which is written:
EM01 D 9948
A google search for EICI127400 turns up some hits for it as a chip but
I haven't found a data sheet yet. There is a component that might be some
kind of inductor. It's shaped like a piece of Wonder Bread with a hole
in the middle and has three prongs descending from the bottom, like the
three on a voltage regulator. All the circuit layout is on the bottom
of the board. I'm thinking of photocopying it just to see if it helps
make sense of the device. There is also a 5 wired (black, green, blue,
yellow, orange) cable that plugs into the board and which, at the other
end, is the jack for the mouse port on the PC.
I don't want to ruin the parts with heat, so I'll see if I can think of
a way to remove the optoisolators without heat. They look pretty accessible.