LG KE820 - Call waiting; Auto redial

5. Trouble shooting
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5.12.12 Checking PAM Control Signals
100p
C401
33u
C408
R407
0
27p
C414
C402
100p
C409
100p
VSUPPLY
100p
C403
14
GND5 GND6
16 17
GND7
19
GND8
21
GND9
1
HB_RFINHB_RFOUT
18
7
LB_RFIN
LB_RFOUT
12
NC1
10
15
NC2
NC3
20
3
TX_EN
VBATT
4
5
VMODE
VRAMP
6
RF3158
U401
BAND_SEL
2
GND1
8
GND10
22 23
GND11
GND2
9 11
GND3
13
GND4
MODE
HBAND_PAM_IN
LBAND_PAM_IN
TXON_PA
PA_BAND
PA_LEVEL
Figure 26. PAM Control Signals Circuit
Figure 27. Transceiver Output
Table 4. PAM Mode Operation
Checking Points
MODE
TXON PA
PA LEVEL
MODE MODE PA_LEVEL TXON_PA
GMSK LOW Ramp Burst Control HIGH
8PSK HIGH Control Amp bias HIGH