Compaq 300 320 321 420 421 620 and 621 Notebook PC and 420 and 620 Notebook PC - Page 77
Fan, and then unplugging the AC adapter from the computer.
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6. Remove the two Phillips PM2.0×2.0 screws (1) that secure the optical drive bracket to the optical drive. 7. Remove the optical drive bracket (2). Reverse this procedure to reassemble and install an optical drive. Fan Description Fan for use in 39.6-cm (15.6-in) computers Fan for use in 35.6-cm (14.0-in) and33.8-cm (13.3-in) computers Spare part number 605791-001 605787-001 Before removing the fan, follow these steps: 1. Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn the computer on, and then shut it down through the operating system. 2. Disconnect all external devices connected to the computer. 3. Disconnect the power from the computer by first unplugging the power cord from the AC outlet and then unplugging the AC adapter from the computer. 4. Remove the battery (see Battery on page 56). 5. Remove the service door (see Service door on page 56). Remove the fan: 1. Position the computer upside down with the front toward you. 2. Disconnect the fan cable (1) from the system board . Component replacement procedures 69