LG KE600 Service Manual - Page 108
Checking RX I/Q Signals
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5. Trouble shooting 5.15.6 Checking RX I/Q Signals 2V7_VCXO C633 100p R620 0 C641 C632 NA 1u 26MHz 4 VCC GND 2 3 OUT VCONT 1 X601 2V85_RF C636 0.1u 1V5_CORE R622 10 C637 0.1u C635 1000p R619 680 C634 22p Figure 14. RX I/Q Circuit AFC BT_CLK RF_CLK RF_DA QX Q IX I Checking Flow Check RX I/Q Signals Signals are N Normal ? Ye RX Part is OK. Check Base Band Circuit or Re-Download S/W and Cal Replace Transceiver PMB6272(U602) Checking Points TX_I (IX) U602 RX_I RX_Q (I) (Q) Figure 15. RX I/Q RX RX_I RX_Q TX_Q (QX) RX_I RX_Q Figure 16. RX I/Q Waveform - 109 -
5. Trouble shooting
- 109 -
5.15.6 Checking RX I/Q Signals
C641
NA
C634
22p
2V85_RF
2V7_VCXO
C632
1u
C633
100p
C637
0.1u
C635
1000p
R622 10
0.1u
C636
R619
680
0
R620
GND
2
OUT
3
4
VCC
1
VCONT
1V5_CORE
X601
26MHz
AFC
RF_DA
QX
Q
IX
I
RF_CLK
BT_CLK
Check RX I/Q Signals
Signals are
Normal ?
Replace
Transceiver
PMB6272(U602)
Ye
N
RX Part is OK.
Check Base Band Circuit
or
Re-Download S/W and Cal
Checking Flow
Checking Points
Figure 14. RX I/Q Circuit
Figure 16. RX I/Q Waveform
RX_I
RX_Q
RX
RX_I
(I)
RX_Q
(Q)
U
602
TX_I
(IX)
TX_Q
(QX)
RX_I
RX_Q
Figure 15. RX I/Q