30 User Guide for the Platinum Series Sound ProcessorStep 3: Microphone and System StatusWhen the battery and lock sequences are complete, the microphone and systemstatus can be verified.To check the microphone and system status, turn the program control to the desiredprogram position.Adjust the volume and sensitivity controls each to the 12:00 position.Observe the green LED indicator as you snap your fingers or speak loudly near themicrophone. The green light should illuminate with each snap of your fingers andwith each syllable.If the green light still does not illuminate, try using the auxiliary microphone and repeatthe system check sequence steps 1-3, as just described. Successful verification of themicrophone and system status with the auxiliary microphone would indicate that theheadpiece needs to be replaced.Note: The green LED will not light up when using a program with the AGCdisabled. Check with your programming center regarding which programto use for assessing the microphone status.Replacing ComponentsThe three most common actions required to restore your processor to properfunctioning are: (1) changing the lithium ion battery, (2) replacing the cable, and(3) replacing the headpiece, as described below.Lithium Ion Rechargeable BatteryThe PSP is powered by a custom-designed, rechargeable lithium ion battery. Analternative battery compartment, accepting three AA (or LR06) batteries, can beused with the processor.As described in “Performing a System Check,” Step 1, a depleted or nearly depletedrechargeable battery should be replaced with a fully-recharged battery by taking thefollowing actions.To Change the Lithium Ion Rechargeable Battery:• Turn the program control to the off (o) position.• Remove the used rechargeable battery by gently pressing and raising therelease lever on the left side of the processor, while at the same time slidingthe battery case toward the lever. Return the used rechargeable battery tothe charger, according to the instructions in the “Batteries and Battery Charger”section found earlier in this user guide.• Using another fully-charged lithium ion battery, align the slide track on the topof the replacement battery with the slide track on the underside of the processor.• Guide the battery onto the processor slide track and slide the battery until it