Only For Training And Service Purposes - LG KP175 Service Manual

4. TROUBLE SHOOTING
(3) Checking PAM Control Signal
TEST POINT
ASM+PAM
Figure 4.3.3
WAVEFORM
CHECKING FLOW
Check TX_RAMP and PAM_EN
Check if there is
Any Major Difference or not Any Major Difference or not
¨ Refer to Graph 4.3.3 ¨
LGE Internal Use Only
C502
(PA_EN)
C506
6
DCS_RX
7
GSM_RX
8
(Tx_RAMP)
GND1
9
GND2
10
GND3
11
ANT
Graph 4.3.3
Similar? Similar? Similar?
Yes
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CIRCUIT
C500 C501 C502 C503
56p 68p 56p 56p
VBAT
C508 C510
10u 0.01u
1
VBATT
20
GND9
U501
19
DCS_IN
18
NC
SKY77518
17
GSM_IN
16
GND8
No
Re-downl oad
S/W
Copyright © 2008 LG Electronics. Inc. All right reserved.

Only for training and service purposes

PA_BAND
PA_EN
R503
TX_RAMP
68
ANT_SW