Dell OptiPlex 270 Service Manual

Contents

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 shutdown 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 stand, if it is attached.6. Open the computer cover.7. Reset the current CMOS settings:a. Locate the password and RTC_RST jumpers on the system board.b. Remove the password jumper from its pins.c. Place the password jumper on the RTC_RST pins and wait approximately 5 seconds.d. Remove the jumper from the RTC_RST pins and place the jumper back on the password pins.8. Close the computer cover.9. Attach the computer stand, if used.10. Connect your computer and devices to electrical outlets, and turn them on.Removing the System Board1. 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 shutdown 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 stand, if it is attached.6. Open the computer cover.7. Remove any components that restrict access to the system board.8. Disconnect all cables from the system board.9. Before you remove the existing system board assembly, visually compare the replacement system board to the existing system board to make surethat you have the correct part.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 thecomputer. While you work, periodically touch an unpainted metal surface to dissipate any static electricity that could harm internal components.NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.CAUTION: Before you begin any of the procedures in this section, follow the steps in "Safety Instructions."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 thecomputer. While you work, periodically touch an unpainted metal surface to dissipate any static electricity that could harm internal components.NOTE: Your replacement board may or may not be attached to a metal tray. If your original system board was attached to a tray, you will transfer thereplacement board to the metal tray before you install the new board. See step 1 in the next procedure.