Panasonic SB-WA720PP Service Manual page 14

Active subwoofer system
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Step 17: Place the P.C.B. as shown for checking.
6.3. Main Component Replacement Procedures
6.3.1. Replacement of the Power IC and Transistor
Step 1: Desolder the Power IC and Transistor terminals.
Step 2: Remove the screws from the IC501.
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