Huawei Ascend - Maps

Y210 Mobile Phone
Maintenance Manual
9 Principles and Failure Analysis
Issue 1.0 (2012-11-28)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
34
Figure 9-8 WCDMA transmission failure
W2100 transmission
failure
When the RF cable is not
inserted, are J3204's pin 1
and pin 2 connected?
Check J3204
Are U3201's control signals
normal?
Check U401
Is the insertion loss
between U3304's pin 1 and
pin 3 approximately 1.1–1.4
dB?
Check U3201 and
U401
Check U3304
Y
N
Y
Y
Y
N
N
Is U3301's output 24 dB?
Check U3301
N
Y
Y
Y
Is the insertion loss
between U3302's pin 2 and
pin 9 approximately 0.6 dB?
Check U3302
N
Check U3801
N
Does U3801's pin A7 have
output?
Check J3204