FLY DS 110, Service Manual

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DS 110 Service menu
2.4.3 Detection and Maintenance Flow Chart of MS Receive
malfunction
No Receive
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 MT6223D
Y
Check IQ signal output pin
of Transceiver,
whether there is IQ signal?
N
Check Transceiver input pin,
whether there is any input
Y
signal?
N
N
Check CPU
Are Transceiver
SDATA
、
SCLK
、
LE
、
RFVCOEN all
correct
？
Y
N
Check or replace the
antenna switch and
matching circuits
Whether PA signal
input pin has
received any signal?
Y
Whether the voltage
Transceiver used is
normal? Is 26MHz
normal?
Check RX-filter
N
Check the
corresponding
power supply
and circuits of
26MHZ
Y
Replace
Check Transceiver
External RC components
. Transceiver
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 (MT6223D) / N : Check Transceiver input pin, whether there is any
corresponding CH input signal (Y : Check whether Transceiver has correctly
controlled the signal
→
Check whether the
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