Huawei Mediapad S7-PRO Maintenance Manual page 79

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 Z18 pin 4 can
receive the GPS signal
normally
Yes
Check whether Z22 pin 4 can
receive the GPS signal
normally
Yes
Check whether the LNA U44
works normally
Yes
Check whether Z5 pin 3 and
pin 4 can receive the GPS
signal normally
Yes
Check whether QTR8615
(U23) works normally
Yes
End
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Maintenance procedures
No
Replace X1
No
Replace Z18
No
Replace Z22
Check the input signal, output signal,
No
logic control signal, and power supply. If
any exception is found, replace U44
No
Replace Z5
Check the power supply for
No
U23. If any exception is found,
replace U23
INTERNAL
Page 79 of 97