FLY E195, Сервисное меню

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E195 Service Menu
12
2.4.3 Detection and Maintenance Flow Chart of MS Receive
malfunction
2.4.4 The maintenance process of Receive malfunction
Maintenance process of NO Receive: Use Repair software to make mobile phone access
to pure receive state
→
Choose 62CH, Rx Mode CH62=947.4MHZ, Input power:-60dbm
in GSM frequency bands
→
Choose 698CH, Rx Mode CH698=1842.4MHZ, Input
power:-60dbm in DCS frequency bands
→
Adjust signal generator to corresponding CH,
connect the signal line to Cable of RF
→
Measure the related key signal by using
Spectrum analyzer and Oscilloscope
→
Measure the signal output pin of Transceiver,
whether there is any correct IQ signal output to CPU
→
Y : Check CPU (MSW8533N) / N :
No Receive
Check CPU
Y
N
Are Transceiver
SDATA
、
SCLK
、
LE
、
RFVCOEN all
correct
？
Y
Check CPU
N
Whether the voltage
Transceiver used is
normal? Is 26MHz
normal?
Y
Check the
correspondi
ng power
supply and
circuits of
26MHZ.
N
Replace
Transceiver
Y
Whether PA signal
input pin has
received any
signal?
N
N
Check RX-filter
Y
Check Transceiver
External RC components
Check IQ signal output pin
of Transceiver, whether
there is IQ signal?
Check Transceiver input
pin, whether there is any
input signal?
Open Repair Software to connect PC with mobile phone, make the
phone access to receiving state, adjust signal generator to
corresponding CH, and connect the signal line to phone’s RX_SW.
Check or replace
antenna switch and
matching circuit