4.4.3 PAM Control Signal part
Check Co ntro l
Signa ls
Sig nals are
Normal ?
Check
Loc os to(U1 02)
Yes
No
PAM Control
Signal is OK.
See next p age to
ch eck
ASM & Mobile SW
Circuit.
PA Enable
U400
FL400
SW400
X101
U102
Tx Ramp
CHECKING FLOW
- 48 -
4. TROUBLE SHOOTING
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
< PAM Control Placement>
< PAM Control Circuit>
< PAM Control Wave >
close to DBB
0.5p
C415
3.3nH
L400
0.01u
C407
47
R404
DNI
C418
ECCH0003002
C405
C2012JF1A106ZT
10u
C419
DNI
1.5p
C402
47
R405
R400
15K
GND8
14
GND9
16
21
P_GND
19
RSVD_GND
VAPC
20
17
VBATT
2
VCC1A
6
VCC1B
BS
1
DCS_PCS_IN
3
15
DCS_PCS_OUT
4
EGSM_IN
11
EGSM_OUT
ENABLE
18
GND1
5
7
GND2
8
GND3
GND4
9
10
GND5
GND6
12
13
GND7
C400
SKY77318
U400
68p
C412
180p
C410
15p
47p
C413
C421
0.5p
27p
C423
1.5p
C422
0.5p
C403
C417
1p
1.5p
C414
L410
2.7nH
0.01u
C408
0.01u
VBAT
10nH
L404
C406
R403
10
39p
C409
VDDRF1
18nH
L403
1nH
L401
3.3nH
L411
2.2p
C401
TXLB
TXHB
TX_RAMP
PA_BAND
PA_EN
Tx Ramp
➁
➀