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(4) Checking PAM Control Signal
Test Points
Figure 4-11
TX_RAMP (R509)
Waveform
Checking Flow
Check TX_RAMP and PA_EN
Check if there is
Any Major Difference or not
i
Refer to Graph 4 - 7
C507
PAC_ENABLE
PA_EN (R502)
DCS_PCS_IN
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- 61 -
4. TROUBLE SHOOTING
Circuit Diagram
VBAT
22u
BS
4
2
R503
GSM_IN
6
36
R504
R505
150
150
5
R506
30
R507
R508
180
180
C506
0.01u
TX_RAMP
PA_EN
Graph 4-6
No
Yes
R501
100
PA_BAND
GPO_17
C501
27p
R502
100
PA_EN
GPO_16
RF2.85V
RF2.85V
C509
27p
C532
C525
100p
22n
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