Egsm Rx - Samsung SGH-C250 Service Manual

3-2.RF

3-2-1. EGSM RX

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NORMAL CONDITION
catch the channel?
YES
PAM300 CHECK
pin12 ≥ -65dBm ?
YES
PAM300 CHECK
pin16 ≥ -65dBm ?
YES
F301 CHECK
pin3,4 ≥ -65dBm ?
YES
U300 CHECK
pin29,30 ≥ -65dBm ?
YES
U300
pin 17 : 2.8V ?
YES
U300 CHECK
pin 19,20 :
26MHz ?
Vp-p :380mV?
YES
U300
pin 2,3,22,23 Vp-p
: 120mV ?
YES
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UCP101 CHECK!!
SAMSUNG Proprietary-Contents may change without notice
NO
CHECK
ANT contact ?
NO
PAM300,RFS300
resolder or change
NO
PAM300
resolder or change
NO
F301
resolder or change
NO
C319,C322,L306
resolder or change
NO
UCP101 pinA13,
C115
change or resolder
NO
OSC300
change or resolder
NO
U300
resolder or change
3-15
Flow Chart of Troubleshooting
CONTINUOUS RX ON
RF INPUT : 62CH
AMP : -50dBm
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