LG MG210 Service Manual page 41

3. H/W Circuit Description
Receiver / Speaker phone Circuits
ANALOG S/W
RCV_N
RCV_P
Figure 21. Receiver and Speaker phone mode system switch
A single analog switch is employed to support both voice and speaker Phone mode with RCV_P. In the
speaker phone mode the SPK_PHN_EN port sets 'H' and RCV_SPK_SEL port sets 'H' , then the RCV_P
will be connected with MIDI sound path(NO) and operate as loud speaker. The other case, the
SPK_PHN_EN port and RCV_SPK_SEL port will remain 'L' state and RCV_P will be connected with
receiver path.(NC)
C230
C4
SPKN
A4
SPKP
C1
A1
DG2011DX-T1-E3 U 203
C234
6
10p
MIDI_SPK_I
4
R223 22 C237 C238
47p 10p
5
R224 22 C239
10p
- 40 -
VBAT
0.1u
DG3535DB-T5-E3
U202
C2
RCV_SPK_SEL
NO1 IN1
A2
NO2 IN2
C3
NC1 COM1 SPK_RCVN
A3
SPK_RCVP
NC2 COM2
V_IO
2
NO V+
1
NC IN SPK_PHN_EN
3
COM GND