Wcmda900 Transmit Calibration Failure - Huawei Mediapad S7-PRO Maintenance Manual

9.12.5 WCMDA900 Transmit Calibration Failure

2012-07-20
S7-PRO Maintenance Manual (Basic Version V2.1)
Power on the
board
Check whether the 19.2
MHz crystal (X1) is
Y
normal
Yes
Check whether the power
supply for QTR8615 (U23) is
normal
Yes
Check whether QTR8615 can
output the signal TX_U900
normally
Yes
Check whether the power
output of the power amplifier
(U29) is within the specified
range
Yes
Check whether the antenna
switch (U46) works normally
Yes
Check whether the antenna
switch (U46) works normally
Yes
End
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Maintenance procedures
No
Replace X1
No
Check the input power of QTR8615
No
Replace QTR8615 (U23)
Check the input signal, output signal, and
No
power supply. If any exception is found,
replace the power amplifier (U29)
No
Replace the duplexer (U32)
Check the input signal, output signal,
No
logic control signal, and power supply.
If any exception is found, replace U46
INTERNAL
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