Compaq 300 320 321 420 421 620 and 621 Notebook PC and 420 and 620 Notebook PC - Page 117
Modem module, Remove the hard drive see
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2. Release the RTC battery from the socket (1) on the system board and lift the battery (2) up. Reverse this procedure to install the RTC battery. Modem module Description For use in all countries and regions except Australia and New Zealand For use only in Australia and New Zealand Spare part number 510100-001 510100-011 Before removing the modem module, 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). 6. Remove the hard drive (see Hard drive on page 59). 7. Remove the optical drive (see Optical drive on page 68). 8. Remove the fan (see Fan on page 69). 9. Remove the palm rest (see Palm rest on page 73). Component replacement procedures 109