LG KE800 Service Manual page 74

4.19.10 Checking PAM Control Signals
32 21
GND19 GND9
33 20
GND18 GND8
34 U502 19
GND17 GND7
35 18
GND16 GND6
36 SKY77340 17
GSM_OUT EN
9 8
GND5 GSM_IN
10 7
GND4 VRAMP
11 6
RSVD2 VBATT
12 5
GND3 RSVD1
13 4
GND2 BS
14 3
GND1 DCS_PCS_IN
15 2
DCS_PCS_OUT MODE
16 1
MODE
GMSK
8PSK
NA NA
VSUPPLY
C541 C542 C543
68u
27p 1000p
Figure 24. PAM Control Signals Circuit
Checking Points
Figure 25. Transceiver Output
Mode TXON_PA
LOW HIGH
HIGH HIGH
Table 4. PAM Mode Operation
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4. Trouble Shooting
2V85_RF 1V5_CORE
R510
C552
10 NA
C538 C539
0.1u 47n
TXON_PA
PA_LEVEL
Mode
PA_LEVEL RSVD1 (VBIAS)
Active x
x Active
_
C536 C537
NA NA
BT_CLK
QX
Q
IX
I
PA_BAND
C546
NA
R511
PA_LEVEL
1.2K
MODE
TXON_PA
820p NA NA
C547 C548 C549