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Level 3 Repair
8-37
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Check the Voltage
C103,C104 < 3.3V?
8-3-14. GSM850/GSM900 Transmitter
TX Power is too Low!!
TX ON (5Level)
CLOCK
CHECK?
26MHz @ OSC200
NO
Re-solder
OSC200
YES
PAM100 pin28
≥
-4
dBm
(R102 using spectrum
analyzer)
NO
Re-solder or change
UCP200
YES
NO
Check the UCP200 & VBAT
circuit.
YES
NO
Resolder PAM100
PAM100 Pin11
≥
30dBm
(L104 using spectrum
analyzer)
YES
Resolder RFS100.
Check the RFS100
connection with PCB?
YES
Antenna
re-solder or change
NO