S7-PRO Maintenance Manual (Basic Version V2.1)
INTERNAL
2012-07-20
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Page 71 of 97
9.12.3 AWS Transmit Calibration Failure
Y
Check the input power of QTR8615
End
Check whether the 19.2
MHz crystal (X1) is
normal
Power on the
board
Maintenance procedures
No
No
No
No
No
No
Check whether QTR8615 can
output the signal TX_PCS
normally
Check whether the power
supply for QTR8615 (U23) is
normal
Check whether the power output
of the power amplifier (U25) is
within the specified range
Check whether the duplexer
(U31) works normally
Check whether the antenna
switch (U46) works normally
Replace QTR8615 (U23)
Check the input signal, output signal, and
power supply. If any exception is found,
replace the power amplifier (U25)
Replace the duplexer (U31)
Check the input signal, output signal,
logic control signal, and power supply.
If any exception is found, replace U46
Replace X1
Yes
Yes
Yes
Yes
Yes
Yes
