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(4) Checking RX IQ
TEST POINT
C413
C417
Waveform
Checking Flow
Check C619,C620.
Check if there is any
Major difference
Refer to graph 4-4
I+_TX_I+
I-_TX_I-
Q-_TX_Q-
Q+_TX_Q+
PED_SELECT
ENABLE
BAND SELECT
Graph 4-4
Similar?
Yes
Redownload software and calibration again
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4. TROUBLESHOOTING
CIRCUIT
VBAT
C409
C410
C411
C412
VBAT
0.1u
33p
22u
3p
1
VCC3
2
3
4
5
6
VCC1
C418
C419
C420
7
0.1u
33p
3p
8
9
VAPC
10
No
Replace U602
IP
C413
39p
IN
QN
C417
39p
QP
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