Huawei Ascend Maintenance Manual page 39

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