Samsung SGH-S108 Service Manual page 30

SGH-S108 Exploded view and its Part list
12. TX_PCS
F1002 pin#7:
about 2~3
dBm?
YES
CON1, C1000
check&change
U1001
pin#3,#6=3.7 V?
pin#2=1.2V?
NO
pin#8≒-5dBm?
pin#7=3V?
change or solder
U100 pin#46,C114
change or solder again
NO
U700
change
change or solder again
NO
F1002
pin#11= 2.85
V?
YES
U1001 pin#5:
NO ≒4~5dBm?
YES
F1002
check & replace
NO
BATTERY, U100
check & change
YES
NO
U1001
YES
U1001
YES
NO
U1001
YES
U1001
U700
check
again
NO
U901
pin#14,#23,#26,
##32 = 2.8V?
YES
NO
U901pin#9,
#10,#12,#13
#25,#28 = 3V ?
=-20dBm ?
YES
U901pin#5,
#6,#7,#8 =1.7V?
YES
U1001
change or solder again
SAMSUNG Proprietary-Contents may change without notice
NO
U700,U701
check & change
U1000
pin#4,#9=3V?
YES
U1000
pin#5,#6,#7=1.2
V?
YES
U1000
pin#13≒
YES
YES
U1000
pin#16=1.2V?
NO
U902#pin5, U100 pin#39,C116
change or solder again
YES
NO
U902
pin #7=13MHz?
Vp-p=950mV
YES
NO
U902
U700
pin#9,#10,#11,
check or change
#12,#13 = 3V?
YES
U901
2-12
CONTINUOUS TX ON CONDI TION
TX POWER DAC:500 CODE APPLIED
CH:62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
NO
U100 pin#44,
C115
check & replace
NO
U700
check
NO
F1000
check & replace
NO
U1000
check or solder again
NO
OSC801
pin #3=13MHz?
Vp-p=950mV
YES
OSC801
pin #4 = 3V ?
YES
U902
change or solder again
OSC801
change or solder again
NO
U100 pin#39,C116
change or solder
again