Wcdma2100/1900 Transception Circuit - Huawei U8185 Maintenance Manual

U8185
Maintenance Manual
Failure: No reception; the phone cannot initiate or receive a call.
Solution:

9.3.2 WCDMA2100/1900 Transception Circuit

W2100/1900 RF transception circuit filter, PA, duplexer, and antenna switch
Issue 1.0 (2012-03-23)
No GSM reception
Upgrade the
software. Problem
solved?
N N
Is the antenna in
good contact?
Y Y
Are C3603, C3608,
and L3605 soldered
properly?
Y Y
Are C3607, C3604,
and L3604 soldered
properly?
Y Y
Are C3613, C3614,
and L3602 soldered
properly?
Y Y
Are C3605, C3606,
and L3603 soldered
properly?
Y Y
Send the phone to an
advanced service site
for repair
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Copyright © Huawei Technologies Co., Ltd.
Y Y
End
Re-install the
N N
antenna
Re-solder or replace
N N
them
Re-solder or replace
N N
them
Re-solder or replace
N N
them
Re-solder or replace
N N
them
9 Principles and Failure Analysis
39