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4. TROUBLE SHOOTING
4.4.3 PAM Control Signal part
CHECKING FLOW
Check Co ntro l
Signa ls
Sig nals are
Normal ?
Yes
PAM Control
Signal is OK.
See next p age to
ch eck
ASM & Mobile SW
Circuit.
➀
C400
68p
VBAT
ECCH0003002
C2012JF1A106ZT
C407
C408
C405
C406
C409
0.01u
0.01u
0.01u
39p
10u
L411
15
3
DCS_PCS_OUT
DCS_PCS_IN
C415
3.3nH
C417
11
4
U400
EGSM_OUT
EGSM_IN
0.5p
1p
SKY77318
19
18
RSVD_GND
ENABLE
21
1
P_GND
BS
L410
C419
2.7nH
C421
DNI
0.5p
< PAM Control Circuit>
LGE Internal Use Only
No
Check
Loc os to(U1 02)
Tx Ramp
R400
TX_RAMP
15K
close to DBB
L400
3.3nH
C402
C403
VDDRF1
1.5p
1.5p
L401
1nH
C410
15p
➁
C412
180p
L403
18nH
R403
C413
10
L404
47p
C418
C414
DNI
10nH
1.5p
R404
47
PA_EN
R405
47
PA_BAND
C422
C423
0.5p
27p
SW400
< PAM Control Placement>
TXHB
TXLB
< PAM Control Wave >
Copyright © 2008 LG Electronics. Inc. All right reserved.
- 52 -
U102
X101
FL400
U400
Tx Ramp
PA Enable
Only for training and service purposes
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