Toshiba 420CDT User Manual page 142

Installing the RTC Battery and Top Cover with Display Assembly
To install the RTC battery and top cover with display assembly, follow the steps below and
refer to Figures 4-30 back through 4-27.
1. Seat the top cover and display assembly and secure two latches at the back of
the computer and four latches at the front. Be careful to seat the left front corner
over the sound jacks.
2. Connect the LED cable to PJ14. Make sure the cable connection is secured with
the pressure plate.
3. Connect the panel close sensor cable to PJ10 (orange) on the system board.
CAUTION: Be sure to connect the panel close sensor cable to the orange
socket, not the white one. The white socket, PJ503, is for the sub-battery
cable. If these connectors are switched, the system will be damaged.
4. Secure the ground cable with one M2.5x6 screw on the system board.
5. Secure the sub-battery base with one M2.5x8 screw.
6. Connect the Real Time Clock battery to PJ3 on the system board. Using the
multimeter, measure the voltage on the test point of PJ3 (Figure 4-30).
+2V to 4V
If the voltage is too low, replace the RTC battery with a new one.
7. Turn the computer upside down and secure three M2.5x8 silver screws and four
M2.5x6 screws.
8. Install the sub-battery, VGA board, keyboard, HDD, FDD or CD-ROM drive,
optional memory module, optional PC card, and battery pack as described in
Sections 4.9 back through 4.2.
4-28
Figure 4-30 Measuring the voltage at PJ3
420 Series