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9-10. GSM850 RX
NORMAL CONDITION
catch the channel?
pin17 ≥ -65dBm ?
PAM100 CHECK
pin11 ≥ -65dBm ?
pin7,6 ≥ -65dBm ?
pin24,25 ≥ -65dBm ?
GSM Receiver is O.K?
YES
PAM100 CHECK
YES
YES
F100 CHECK
YES
RFT100 CHECK
YES
RFT100
pin 31 : 2.9V ?
YES
RFT100 CHECK
NO
pin 9,10
freq :26MHz ?
Vp-p : 380mV?
YES
NO
RFT100
pin 1,2,3,4 Vp-p
: 120mV ?
YES
NO
YES
END
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CHECK soldered
NO
ANT contact
L101,C107,C108,L121,L100,C106,C112,C136
NO
PAM100, RFS100
resolder or change
NO
PAM100
resolder or change
NO
F100
resolder or change
NO
RFT100
resolder or change
NO
UCD300 pin F3, C313,C314
change or resolder
OSC100
change or resolder
RFT100
resolder or change
GSM RX path component
resolder or change
9-25
Flow Chart of Troubleshooting
CONTINUOUS RX ON
RF INPUT : 190CH
AMP : -50dBm
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