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4. Reinstall the hard drive(s). 1 screws (2) 2 I/O panel 3 I/O panel cage 1 side hinges 2 front panel 5. Replace the computer cover. 6. Connect your computer and devices to electrical outlets, and turn them on. Back to Contents Page NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer. Back to Contents Page Power Supply Dell™ OptiPlex™ 160L Service Manual Removing the Power Supply Replacing the Power Supply DC Power Connectors 1. Shut down the computer through the Start menu. 2. Ensure that your computer and attached devices are turned off. If your computer and attached devices did not automatically turn off when you shut down your computer, turn them off now. 3. Disconnect any telephone or telecommunication lines from the computer. 4. Disconnect your computer and all attached devices from their electrical outlets, and then press the power button to ground the system board. 5. Remove the computer cover. Removing the Power Supply 1. Remove the fan assembly. 2. Disconnect the AC power cable from the AC power connector on the back of the power supply. 3. Unplug the DC power cables from the drives and system board. 4. Remove the four screws that secure the power supply to the back of the computer. CAUTION: Before you perform this procedure, see the safety instructions in your Setup and Quick Reference Guide. NOTICE: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an unpainted metal surface (such as the back panel) on the computer. NOTICE: Before you disconnect a device from the computer or remove a component from the system board, verify that the standby power light on the system board has turned off. To locate the light, see "System Board Components." NOTICE: To disconnect a network cable, first unplug the cable from your computer and then unplug it from the network wall jack. CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover. NOTICE: Before touching anything inside your computer, ground yourself by touching an unpainted metal surface, such as the metal at the back of the computer. While you work, periodically touch an unpainted metal surface to dissipate any static electricity that could harm internal components. 5. Remove the power supply from the computer. Replacing the Power Supply 1. Slide the power supply into place. 2. Replace the four screws that secure the power supply to the back of the computer. 3. Reinstall the fan assembly. 4. Reconnect the DC power cables to the drives and system board. 5. Replace the computer cover. 6. Connect the AC power cable to the AC power connector on the back of the power supply. 7. Connect your computer and devices to electrical outlets, and turn them on. DC Power Connectors Power Supply DC Connector Pin Assignments Main Power Connector 1 screws (4) 2 power supply NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer. Pin Number Signal Name 22-AWG Wire 1 +3.3 VDC Orange 12-volt Power Connector Peripheral Power Connectors Floppy Drive Power Connector Back to Contents Page 2 +3.3 VDC Orange 3 COM Black 4 +5 VDC Red 5 COM Black 6 +5 VDC Red 7 COM Black 8 PWR_OK Gray 9 +5 VSB Purple 10 +12 VDC Yellow 11 +3.3 VDC [+3.3 V default sense] Orange [Brown] 12 –12 VDC Blue 13 COM Black 14 PS ON# Green 15 COM Black 16 COM Black 17 COM Black 18 N/C N/C 19 +5 VCD Red 20 +5 VCD Red Pin Number Signal Name 22-AWG Wire 1 COM Black 2 COM Black 3 +12 VDC Yellow 4 +12 VDC Yellow Pin Number Signal Name 22-AWG Wire 1 +12 VDC Yellow 2 COM Black 3 COM Black 4 +5 VDC Red Pin Number Signal Name 22-AWG Wire 1 +5 VDC Red 2 COM Black 3 COM Black 4 +12 VDC Yellow Back to Contents Page System Board Dell™ OptiPlex™ 160L Service Manual System Board Components Jumper Settings Replacing the System Board System Board Components Jumper Settings 1 power connector (J21) 10 front-panel audio connector (J29) 2 hard-drive connector (J23) 11 PCI card Slots (3) (PCI1, PCI2, PCI3) 3 CD drive connector (J20) 12 modem telephony connector (J25) 4 floppy-drive connector (J18) 13 CD audio connector (J8) 5 control panel connector (J28) 14 12V POWER connector (J10) 6 battery socket (BT1) 15 processor connector (U16) 7 clock jumper (CLEAR CMOS) 16 fan connector (J30) 8 front-panel connector (J27) 17 memory module connectors (DDR1, DDR2) 9 password jumper (CLEAR PASSWORD) 18 power indicator (LED1) To change a jumper setting, pull the plug off its pin(s) and carefully fit it down onto the pin(s) indicated. Resetting CMOS Settings 1. Shut down the computer through the Start menu. 2. Ensure that your computer and attached devices are turned off. If your computer and attached devices did not automatically turn off when you shut down your computer, turn them off now. 3. Disconnect any telephone or telecommunication lines from the computer. 4. Disconnect your computer ...