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(2) Checking TX I/Q
TEST POINT
C537
U502
WAVEFORM
CHECKING FLOW
Check C509, C537.
Check if there is any
Major difference
Refer to graph 4.2.3
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
C509
Similar?
Yes
Redownload software and calibration again
- 45 -
CIRCUIT
C509
NA
2V75_VVCXO
RX1900B
25
RX1900
VLDO2
26
RX1800B
VLDO1
U502
27
RX1800
VBAT
28
RX900B
AD6548
VDD
29
RX900
EUSY0280101
VCC_TXVCO
30
RX850B
TXOP_HI
31
RX850
TXOP_LO
32
VLDO3
GND
33
C537
NA
No
No
Replace U502
QP
QN
C519
0.1u
16
15
14
13
12
11
10
9
IP
IN
LGE Internal Use Only
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