Maintenance Procedures For Gsm Receive Failure - Huawei Mediapad S7-PRO Maintenance Manual

9.13.2 Maintenance Procedures for GSM Receive Failure

2012-07-20
S7-PRO Maintenance Manual (Basic Version V2.1)
Power the board
on
Check whether the antenna switch
(U46) and the GSM receive channel
work normally
Yes
Check whether the input and
output signals of duplexers
(U21) (GSM850) are normal
Yes
Check whether
QTR8615 (U23) works
normally
Yes
End
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Maintenance procedures
No
Check the input signal, output signal,
logic control signal, and power supply.
If any exception is found, replace U46
No
Y
Y
No
Check the power supply for U23. If any
exception is found, replace U23
INTERNAL
Replace U21
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