LG MG810c Service Manual page 30

ii. Down-link path
A voice signal from ABB(HSOR, HSOL) goes to RX_IN, EXT_IN of YMU783. which ports are analog
voice input of analog mixer block. In case of using head-set, the analog mixer of YMU783 is set to
head-phone out path. The voice signal is amplified via head-phone amplifier and goes to ear-
phone(HSO_R, HSO_L). In case of using main-receiver, the analog mixer is set to Speaker out
path(SPOUT_L) and the voice signal goes to main speaker/receiver(SPK_RCV_P, SPK_RCV_N).
H. KeyPad Switching & Scanning
Keypad Map
DBB supports 6x6 keymap and Switch-ON Key is connected directly to ABB as (Figure16.).
C107 C108 C109 C110 C101
10u
0.1u 0.1u 1u 0.1u
HPOUTR
BBR
HPOUTL_MONO
BBL
EXC
EXTOUT
TXOUT
SPOUT1R2
SPOUT1R1
SPOUT2R
SPOUT1L2
SPOUT1L1
SPOUT2L
C123
22n
C127 C128
1000p 100p
Figure 15. Down-link circuits related with YMU783
Table 7. Keypad Map
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3. H/W Circuit Description
L101
HSO_R
J7
100nH
H4
L102
HSO_L
G4
100nH
J3
J6
C114 C115 C116 C117
0.1u 0.1u 100p 100p
H6
E1
J9
H8
J8
L103
J1
SPK_RCV_P
H2
100nH
C119
J2
47p
L105
SPK_RCV_N
100nH
NA NA
C121 C122
HSOL
HSOR