FLY DS 110, Service Manual

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DS 110 Service menu
2.4 Common RF Malfunction
2.4.1 Detection and Maintenance Flow Chart of MS Transmit
malfunction
(No transmit) Connect PC and cell
phone with maintenance of line, use the
Repair software making mobile phone
access to transmit state.
Check IQ signal input
pin of Transceiver,
whether there is
IQ signal?
N
Check CPU
Y
Check RF signal output
pin, whether there is
any RF
Y N
Check antenna
switch or matching
network
CheckTransceiver,whethe
there is any RF output signal?
Y
VBAT, PA_EN,
N
BANDSW_DCS,V
APC, are they OK?
Check
Transceiver
Y
External
N
Y
Replace PA Check CPU
Replace
Transceiver
2.4.2 The maintenance process of Transmit malfunction
Use the Repair software making 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:
4