Samsung SGH-S108 Service Manual page 26

SGH- S108 E xploded view and its Part list
8. TX_EGSM
F1002
pin#13:about
2~3 dBm?
YES
CO N1, C1000
check&change
U1001
pin#3,#6=3.7V?
YES
U1001
pin#2=1.2V?
YES
U1001
NO
pin#1¡Ö
- 5dBm?
YES
U1001
pin#7=3V?
YES
U1001
change or
solder again
NO
U901 pin#14,#23,#26,
U100
pin#46,C114
change or
solder again
U901pin#9,
#10,#12,#13
=- 20dBm ?
U901pin#5,
NO
#6,#7,#8
U1001
U700
change or
change
solder again
NO
F1002
pin#11= 2.85 V?
YES
U1001 pin#5:
¡Ö4~5dBm?
NO
YES
F1002 check & replace
NO
BATTERY, U100
check & change
NO
U1000 pin#4,#9=3V?
U1000 pin#5,#6,#7=1.2V?
NO
YES
U700
check
##32 = 2.8V?
YES
NO
U902#pin5,
#25,#28 =
YES
U902 pin
#7=13MHz?
YES
U902
pin#9,#10,#11,
YES
U901
change or
solder again
SAMSUNG Proprietary-Contents may change without notice
NO
U700,U701
check & change
YES
YES
U1000
pin#12¡Ö- 20dBm?
YES
U1000
pin#16=1.2V?
U100
NO
pin#39,C116
change or
solder again
YES
NO
O SC801 pin
#3=13MHz?
Vp- p=950mV
YES
NO
U700
check or
change
2- 8
CONTINUOUS TX ON
CONDITION
TX POWER DAC:500 CO DE
APPLIED
CH:62
RBW : 100KHz
VBW : 100KHz
S PAN : 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
change or
solder again
YES
NO
OSC801
U100
pin #4 =
pin#39,C116
change or
solder again
YES
U902
change or
solder again