Maintenance Manual

Maintenance Manual
8
3.2 Audio Module
3.2.1 Micphone Circuit
Figure 3.2.1 Micphone circuit
Micphone connect U200 pin U1/U2 through CAP(C504/C512) and MICBIAS voltage is about
2.8volt.
Step 1. whether SMD component of MIC Circuit is correct, not damaged and missing;
Step 2. whether PCB route is connecting;
Step 3. whether IC U200 is damaged.