Only For Training And Service Purposes - LG CP150 Service Manual

4.4.2 PAM INPUT Part(Locosto Output)
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.
VBAT
ECCH0003002
C2012JF1A106ZT
C407 C408
C406 C409
0.01u 0.01u
0.01u 39p
L411
3.3nH
C415 C417
0.5p 1p
L410
C419 2.7nH C421
DNI 0.5p
Copyright © 2008 LG Electronics. Inc. All right reserved.

Only for training and service purposes

No
Check
Loc os to(U1 02)
R400
15K
C400
68p
C405
10u
15 3
DCS_PCS_OUT DCS_PCS_IN
11 4
U400
EGSM_OUT EGSM_IN
SKY77318
19 18
RSVD_GND ENABLE
21 1
P_GND BS
C422 C423
0.5p 27p
< PAM INPUT Circuit>
4. TROUBLE SHOOTING
FL400
SW400
< PAM INPUT Placement>
➀
close to DBB
L400
3.3nH
C402 C403
VDDRF1
1.5p 1.5p L401
1nH
➁
C410
15p
C412
180p
L403
18nH
C413
R403
10 L404 47p C418
C414 DNI
10nH
1.5p
R404 47
R405 47
- 47 -
U102
X101
U400
TX_RAMP
High Band
TXHB
Type 5dB
(3 ~ 7dB)
Low Band
TXLB
Type 5dB
(3 ~ 7dB)
PA_EN
PA_BAND
LGE Internal Use Only