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4. 故障解决
1．检查射频供电电路
测试点
电路图
VAPP_ABB
VUSBIN
VUSB_ABB
VABB_ABB
C327
C328
C329
2.2U
1U
1U
(1608)
VSIM_ABB
VPLL_ABB
VRF_ABB
VMIC_ABB
VGP_ABB
C330
C331
C332
C333
C334
10U
1U
1U
1U
1U
(1608)
- 82 -
VLL_ABB
VEXT_ABB
VRTC_ABB
C335
C336
C337
C338
1U
0.1U
1U
1U
N1
VINT1
P1
VINT2
L1
VLL1
M1
VLL2
K1
VLLFB
A4
VEXTI
B4
VEXT2
U301-A
AD6857_2
N8
VRTCSEL
P8
VRTC
P7
VSIM
K12
VMIC
E4
VPLL
D12
VRF
A1
VGP
G13
VABB
D13
VUSBIN
E13
VUSB
D14
VAPP
E12
VAPPGATE
M12
PWREN
C339
NC
(100N)
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