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• "3.5-inch primary hard disk drive cage" on page 68
2. Disconnect the power supply assembly cables from the system board.
Removal steps
Coin-cell battery
Prerequisite
Before you start, read Generic Safety and Compliance Notices, and print the following instructions.
Your computer has a special type of memory that maintains the date, time, and settings for built-in features,
such as parallel connector assignments (configurations). A coin-cell battery keeps this information active
when you turn off the computer.
The coin-cell battery normally requires no charging or maintenance throughout its life; however, no coin-cell
battery lasts forever. If the coin-cell battery fails, the date and time information is lost. An error message is
displayed when you turn on the computer.
To dispose of the coin-cell battery, refer to the "Lithium coin-cell battery notice" in the Safety and Warranty
Guide.
For access, remove these parts in order, if any:
• "Computer cover" on page 49
• "Optical drive" on page 50
• "Front bezel" on page 51
• "Optical drive cage" on page 55
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M90t Gen 3 Hardware Maintenance Manual
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