G Sm Trans M I T T Er - Samsung SGH-S300 Service Manual

SGH-S300 Fl ow Chart of Troubl eshooti ng and Ci rcui t Di agram s

4. G SM Trans m i t t er

F1002 pi n 13
about 2~ 3dB m ?
YES
CN 1001, C 1012
check & change
pi n 4 : 3. 7 V ?
pi n 2 : 1. 2 V
V and pi n3: 3V
U 1001 pi n 7
change & r esol der
U 100 pi n46, C 114 U 901
change or
pi n9, 10, 12, 13:
resol der -20dB m ?
U 901
N O
pi n5, 6, 7, 8
U 700 U 1001
change check & change
N O
F1002
pi n 11 : 2. 8V
YES
U 1001 pi n 9
pi n 3~ 4dBm ?
N O
YES
F1002
check & change
N O
U 1001
BA T T E RY , U 100
check & change
YES
N O
U 1001
YES
N O
U 1001pi n2: 0
U 700
check & change
YES
N O
U 1001pi n 6:
1. 2 V ?
YES
N O
: -5dB m ?
YES
U 1001
U 901
N O
pi n14, 23, 26, 32
2. 8V ?
YES
U 901
N O
pi n5, 25, 28
3V ?
YES
U 902
pi n 7 13M H z
V p-p : 950m V
1. 7V
YES
U 902
pi n9, 10, 11, 13
3V ?
U 901
change or
resol der
SAMSUNG Proprietary-Contents may change without notice
N O
U 700, U 701
check & change
U 100 pi n39, c116
N O
change or
resol der
YES
N O
YES
N O
U 700
check & change
YES
6-10
CO N T I N U S T X ON
CO N D I T I ON
M S T X l evel 19
CH : 62
RB W : 100K H z
V BW : 100K H z
SPA N : 10M H z
REF LEV . : 10dB m
A T T . : 20dB
OSC 801
OSC 801
N O
pi n 3 : 13M H z?
change or
V p-p : 950m V
resol der
YES
U 100 pi n39, c116
N O
OSC 801
change or
pi n 4 : 3V ?
resol der
YES
U 902
change or
resol der