Only For Training And Service Purposes - LG KG280 Service Manual

(3) Checking PAM Control Signal
TEST POINT
U600
C606 (PAM_EN)
Figure 9
Waveform
Checking Flow
Check TX_RAMP and PA_EN Check TX_RAMP and PA_EN
Check if there is Check if there is
Any Major Difference or not Any Major Difference or not
Refer to Graph 6
Copyright © 2007 LG Electronics. Inc. All right reserved.

Only for training and service purposes

15
DCS_PCS_OUT
11
EGSM_OUT
19
RSVD_GND
SKY77318
21
P_GND
C650
(TX_RAMP)
Graph 6
Similar? Similar? Similar?
Yes Yes Yes
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4. TROUBLE SHOOTING
CIRCUIT
C605 C651
0.01u 0.01u
R605
R607 24
220
3
DCS_PCS_IN
R612
4
R611 30
EGSM_IN
U600
18 180
ENABLE
1
BS
C606
27p
No No No
Redownload S/W
C608
R608
33p
220
C611
R613
10p
180
R601 100ohm
PA_EN
R602 100ohm
PA_BAND
C607
NA
LGE Internal Use Only