Old Logic Board
T
o modify an old logic board (one that does not have the 3-
pin CN1
1 connector on its left side):
1.
Remove the tension spring from above the upper right
corner of the logic board and unscrew the six screws
holding the board in place. Remove the board.
2.
Find the one–inch jumper wire packaged with the
daughter board installation bracket in the Optical
Sensor Assembly Kit. Y
ou must solder this wire to the
underside of the main logic board between pin 4 of
connector CN3 (Figure 22, #1) and the positive terminal
of capacitor C1 (Figure 22, #2).
FIGURE 22
The cutaway view of connector CN3 (see Figure 23)
displays what could possibly happen to pin number 4
when heat is applied while soldering the jumper wire to
the main CPU board. If pin #4 is damaged, straighten
the pin before inserting the connector into the socket;
otherwise the single wire that is later installed into
connector CN3 could be dislodged.
FIGURE 23
