Dcs Transmitter - Samsung SGH-P520 Service Manual

10-2-5. DCS Transmitter

U100 pi n 12
a bout
2~5dBm?
YES
1 U100,L100,
L101,C102
check & change
U100 p in 7 : 3.7V
U100 pin4: 'HIGH'
7
c ha n g e &resolder
8
U100
cha nge or resolder
U101
pin4,5,6,7
1.25V
NO
YES
9
10
UCP300
change
NO
U100
pin 6 : 2.8V
YES
U100 pin1
3~6dBm?
NO
YES
U100 c heck & change
NO
YES
NO
YES
NO
UCP300
U100
p i n 9 : ' H IGH'
check & cha nge
YES
U100
NO
pi n 6 : 1.2V
?
YES
PAM100 pin NO
12
: -5dBm?
YES
U100
U101
pin18 :
YES
7~11dBm?
NO
NO
pin35 26MHz
Vp-p :950mV
U101
check &
U101 change or
11
change
resolder
UCP300
NO
check &
change
3
BATTERY, BATTERY C ONNECTOR
check & change
UCP300 check & change
6
U101
NO
YES
10-29
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
OSC100
YES
change or
pin 3 : 26MHz
resolder
Vp-p : 950mV
NO
OSC100
change or reso lder
U101