HP LTE Notebook PC 5150 LTE 5000 Family of Personal Computers Maintenance and - Page 35

The MultiBay connector board is mounted between the two MultiBays and serves to route the appropriate signals to the MultiBay connectors. 1.7.3 Power Supply The power supply is an AC-to-DC converter that serves the same function as the AC adapter and DC-to-DC converter in the computer. It provides regulated DC power for all of the subsystems. The expansion base uses a standard AC power cord that connects directly to the power supply. An external fan mounted on the power supply provides cooling. When the temperature of the power supply exceeds 104oF (40oC), the fan turns on. When the temperature drops below 104oF, the fan turns off. The MultiBay ISA model has an auxiliary cooling fan mounted on the rear of the bottom case. The auxiliary fan remains active as long as power is applied to the MultiBay ISA Expansion Base. 1.7.4 IrDA Interface The IrDA interface is mounted on the front left corner of the expansion base and shares a small PCB with the removable drive status lights. The board is mounted to the underside of the expansion base top cover with a single screw. The IrDA interface on the expansion base replicates the IrDA interface on the computer. 1.7.5 Activity Lights The expansion base has two sets of activity lights. Removable-Drive Lights The removable-drive lights are installed on the front left of the expansion base and share a small PCB with the IrDA interface. The board is installed as a unit from the back side of the expansion base top cover. The status lights are identified in Figure 1-7 and described in Table 1-10.