Checking Pam Control Signal - LG C3100 Service Manual

4. TROUBLE SHOOTING

4.3.5 Checking PAM Control Signal

C401
47p
8
9
VCC_OUT
10
DCS_OUT
11
VCC2
12
VBAT
C402
C403
22p 10u
GSM_IN
7
VCC1
VRAMP
6
GSM_OUT
VREG
5
RF3133
VBATT
4
U400
TX_ENABLE
3
BAND_SELECT
2
DCS_IN
1
Check TX_RAMP and PA_EN
Check if there is
Any Major Difference or not
• Refer to Graph 4-13
TX_RAMP (R401 )
PA_EN (R402)
Figure 4-14
R401 15K
R402 100
R404 100
C405 C406 C407
27p
27p
39p
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Graph 4-13
- 48 -
TX_RAMP AD6521
PA_EN
GPO_16
PA_BAND GPO_17
No
Download S/W
Yes