Huawei u8800 - RF Receiving Failure-Wcdma2100 Mhz

U8800 Maintenance Manual Basic Version V1.1 Internal
2011-03-21
Huawei confidential. No spreading without permission. Page 53 of 61
9.16.2 RF Receiving Failure-WCDMA2100MHz
Analysis：Above all, check RF parameter whether is correct, the wrong RF parameter can cause the
failure usually. Reference Figure 9-10
Signal Failure
(W2100MHz)
Measure VREG_RF
whether voltage is
normal？
Measure whether two pins
of the U3201 are
connection？
Replace the U3201
Replace U3202, check
whether it is normal？
BT/CT
Replace U201
Y
N
Y
Y
Y
N
Replace U3304, check
whether is normal？
Y
Measure whether the
U3701 is normal？
Replace the U3701
N
N
N
Replace the U301