Blu Life Play X, Service Manual

Page: 15 / 27

15 / 27
2.2.3.2 MIC, RECEIVER LOOP
MIC Audio channel is shown below: This product uses the dual
（
OPTION
）
analog MIC in order to
reduce noise when you use voice calling. The power supply voltage is 1.8V-3.3V. When MIC is in
good condition but loop MIC has no echo, then you need to check the basic bias voltage signal of
the VMC, the language signals of the RECEIVER and MIC also need to be checked.
Receiver units are placed on FPC, the Motherboard MIC LOOP drive the FPC directly through
J301.Filter and ESD protected network, are also placed on FPC. As shown below: