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SAMSUNG Proprietary-Contents may change without notice
Flow Chart of Troubleshooting and Circuit Diagrams
10-23
This Document can not be used without Samsung's authorization
10-2.RF
10-2-1. EGSM Receiver
Continuous RX on
RFinput : 62CH AMP :
-50dBm
Yes
Yes
No
Yes
Yes
Yes
Check UCD701
U903 check or resolder
UCD701 pin B10, C736
Check or resolder
TCX901
change or resolder
C907, R902
check or resolder
No
No
U903 check
pin 25,26,27,28
Vp-p:100mV
U903 check
pin 1,8,31,36,41
clean 2.8V
No
No
UCD701 pin A13, C735
check or resolder
TCX901 check
pin 4 = clean 3V?
TCX701 check
pin3 = 26M ?
Vp-p : 1V
U903 check
pin 35 = 26M ?
Vp-p : 860mV
C925, C926, L907
resolder or change
No
U903 check
pin 6,7 = -65dBm
Yes
F901 resolder or
change
No
F901 check
pin 1,2 = -65dBm
Yes
RFS901 resolder or
change
No
F901 check
pin13 = -65dBm
Yes
Check soldered status
of C916,L901
No
Normal
Condition catch
the channel?
Yes