420 Series 4-25
Installing the Sub-Battery and VGA Board
To install the sub-battery and VGA board, follow the steps below and refer to Figures 4-26
back through 4-22.
1. Connect the VGA cable to PJ302 and PJ303 (TFT model only) on the VGA
board. Make sure the ferrite core is seated properly.
NOTE: Make sure the PJ301 connector on the VGA board and PJ16 on the
system board are not dirty, if these are dirty, clean them. If a connector is
broken, replace the VGA board or system board with a new one.
2. Be sure the microphone cable is on top of the VGA board and rotate the board
into place. When it is seated flat, press evenly to connect the VGA board
connector to PJ16 on the system board.
3. Connect the microphone cable to PJ3 on the sound board. Route the cable in a
groove on the top cover and secure it with two tapes (Figure 4-25).
4. Seat the sub-battery and connect the cable to PJ503 on the system board.
CAUTION: Be sure to connect the sub-battery connector to the white socket,
not the orange one. The orange socket, PJ10, is for the panel close sensor
cable. If these connectors are switched, the system will be damaged.
5. Use a multimeter to measure the TP2 (+) and ground voltage according to the
following value.
TP2 6.0 V to 8.0 V
If the voltage is too low, replace the sub-battery with a new one.
Figure 4-26 Measuring the voltage at TP2
6. Install the keyboard, HDD, FDD or CD-ROM drive, optional memory module,
optional PC card, and battery pack as described in Sections 4.8 back through 4.2.
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