Prima LC-20S3 Service Manual page 14

3. STR-W6856N switch adjustment IC
4. AN7522: dual-channel single-end push and pull audio power amplifier (10Wtyp)
AN7522 PINS instruction
Pin Function
2, 5 Input
7, 12 Output
Figure 1-3STR-W6856N internal block diagram
Figure 1-4 AN7522 internal block diagram
Pin Function
8 MUTE
4 GND(input)
Pin Function
9 GND(output)
10 VCC
12