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8-3-14. GSM850/GSM900 Transmitter
TX Power is too Low!!
TX ON (5Level)
TCXO CLOCK
CHECK?
26MHz @ OSC201
YES
PAM100 pin27 ≥ -4
dBm
(TP:R106 using
spectrum analyzer)
YES
Check the Voltage
C106 < 3.3V?
YES
PAM100 Pin17 ≥
30dBm
(TP:L113 using
spectrum analyzer)
YES
Check the RFS100
connection with PCB?
YES
Antenna
re-solder or change
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NO
Re-solder
OSC201
NO
Re-solder or change
UCP200
NO
Check the UCP200 & VBAT
circuit.
NO
Resolder PAM100
NO
Resolder RFS100.
8-35
Level 3 Repair
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