Dcs Transmitter - Samsung SGH-U100 Service Manual

3-2-5. DCS Transmitter

F101 pi n 6
a bout
2~3dBm?
YES
1
F101,C101
check & change
PAM101 pin 4 : 3.7V
PAM101 pin 3 : 'HIGH'
PAM101 pin
7
c ha n g e &resolder
8
C106
cha nge or resolder
UCD101
pin35,36,37,3
8 = 1.7V
NO
10
9
U300
change
UCD101
check &
change
NO
F101
pin 2 : 2.8V
YES
PAM101 pin14
3~4dBm?
NO
YES
PAM101/R104 chec k & cha nge
NO
YES
NO
YES
NO
U300
PAM101
p i n 1: ' H IGH'
check & cha nge
YES
PAM101
NO
pi n 6 : 1.2V
?
YES
NO
14
: -5dBm?
YES
PAM101
UCD101
pin40 :
NO 7~11dBm?
YES
UCD101
pin21 13MHz
NO
Vp-p :950mV
YES
UCD101
11
resolder
U300
NO
check &
change
3
BATTERY, BATTERY C ONNECTOR
check & change
U300 check & change
6
NO
YES
change or
change or reso lder
3-27
Flow Chart of Troubleshooting
2
CONTINUS TX ON
CONDITION
MS TX level 12
CH : 698
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
4
ATT. : 20dB
5
OSC101
UCD101
YES
change or
pin 3 : 13MHz
resolder
Vp-p : 950mV
NO
OSC101
12