Huawei YU220 Service Manual page 35

YU220 service manualV1.0
From above principle part, we can see speaker access from U501, R513,R541's
OR set out , and pass B703，B704 to reach speaker, so need to make sure the
resistance and magnetic bead whether is OK.：
Huawei secrets, no dispersion without permission
2013-10-18