PS4210 Hardware Owner's Manual 3 Maintaining Control ModulesFigure 21: Inserting the MicroSD Card3. Install the control module in the array. See Installing a Control Module on page 23.4. Ensure the control module is operational. See Interpreting Control Module LEDs on page 16.Battery ReplacementThis section describes the steps that must be followed when replacing the battery in a PS Series array controlmodule.Many repairs may be done only by a certified service technician. You should perform troubleshootingand simple repairs only as authorized in your product documentation, or as directed by the online ortelephone service and support team. Damage due to servicing that is not authorized by Dell is notcovered by your warranty. Read and follow the safety instructions that came with your system.For information on removing and reinstalling system parts, see the system's Hardware Owner's Manual,available at support.equallogic.com.Control Module Handling RequirementsFollow these control module handling requirements:• Do not remove an active control module.• Protect control modules from electrostatic discharge. Always wear an electrostatic wrist strap whenhandling a control module.26