Samsung SGH-M310 Service Manual page 51

Flow Chart of Troubleshooting
10-2.RF
10-2-1. EGSM RX
NORMAL CONDITION
catch the channel?
PAM100
pin12 ≥ -65dBm ?
PAM100 CHECK
pin17 ≥ -65dBm ?
pin6 ≥ -65dBm ?
RFT100
pin29,30 ≥ -65dBm ?
pin 17 : 2.9V ?
RFT100 CHECK
Vp-p : 380mV?
pin 2,3,22,23 Vp-p
GSM Receiver is O.K?
YES
NO
CHECK
YES
YES
NO
F100 CHECK
YES
CHECK
YES
NO
RFT100
YES
NO
pin 19,20
freq :26MHz ?
YES
NO
RFT100
: 120mV ?
YES
NO
YES
END
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NO
CHECK soldered
ANT contact,C130,L101,C100,R100
PAM100,RFS100
resolder or change
NO
PAM100
resolder or change
F100
resolder or change
NO
RFT100
resolder or change
UCD300 pinF3, C311,C312
change or resolder
OSC101
change or resolder
RFT100
resolder or change
GSM RX path component
resolder or change
10-13
CONTINUOUS RX ON
RF INPUT : 62CH
AMP : -50dBm