FLY E195, Сервисное меню

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E195 Service Menu
7
2.4 Common RF Malfunction
2.4.1 Detection and Maintenance Flow Chart of MS Transmit
malfunction
2.4.2 The maintenance process of Transmit malfunction
Use the Repair software and make mobile phone access to transmit state. Choose 62CH
in GSM band, POWER Level for 5, DCS for 700CH, POWER Level for 0. Then, first
observe whether the current rises, and use the spectrum analyzer and oscilloscope to
observe the signal given in the above-mentioned flow chart, the specific signal waveforms
shown as below:
Check IQ signal input
pin of Transceiver,
whether there is IQ
signal?
Check RF signal output
pin, whether there is
any RF signal?
Y
Check CPU
N
Y
Y
Check Transceiver,
whether there is any
RF output signal?
N
VBAT, PA_EN,
BANDSW_DCS,
VAPC, are they OK?
Replace PA
Y
Check CPU
N
Replace
Transceiver
N
Check
Transceiver
External RC
Y
(No transmit) Connect PC and cell
phone with maintenance of line, use the
Repair software making mobile phone
access to transmit state.
Check antenna switch
or matching network