Gsm Lb Transmit Calibration Failure - Huawei Mediapad S7-PRO Maintenance Manual

9.12.7 GSM LB 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 normal
Y
Yes
Check whether the power
supply for QTR8615
(U23) is normal
Yes
Check whether QTR8615
can output the signal
TX_GSM_LB normally
Yes
Check whether the
TX_GSM850_EGSM9 power
output of the power amplifier (U47)
is within the specified range
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)
Y
Check the input signal, output signal, and
No
power supply. If any exception is found,
replace the power amplifier (U47)
Check the input signal, output signal,
logic control signal, and power
No
supply. If any exception is found,
INTERNAL
replace U46
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