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4. TROUBLESHOOTING
(6) Checking TX IQ
TEST POINT
CIRCUIT
Checking Flow
VBAT
1
VCC3
2
I+_TX_I+
3
I-_TX_I-
4
Q-_TX_Q-
5
Q+_TX_Q+
6
VCC1
7
PED_SELECT
8
ENABLE
9
VAPC
10
BAND_SELECT
11
Check if there is
Any Major Difference
Refer to Graph 4-8
Redownload the Software
And calibrate
- 68 -
Waveform
Graph 4-8
C409
C410
C411
C412
VBAT
0.1u
33p
22u
3p
C418
C419
C420
0.1u
33p
3p
No
Replace U602
Similar?
Yes
IP
C413
39p
IN
QN
C417
39p
QP
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