Samsung SGH-U600 Service Manual page 40

3-2-5. GSM850 Transmitter
F101 pi n 8
a bout
2~5dBm?
YES
1
F101, C100
check & change
PAM100 pin 4 : 3.7V
PAM100 pin3: 'LOW'
PAM101 pin
7
c ha n g e &resolder
8
C112
cha nge or resolder
U100
pin27,28,29,30
1.7V
NO
YES
9
10
UCP300
check &
change
change
NO
F101
pin 6 : 2.8V
YES
PAM100 pin7
3~6dBm?
NO
YES
PAM100/R105 chec k & cha nge
NO
YES
NO
YES
NO
UCP300
PAM100
p i n 1: ' H IGH'
check & cha nge
YES
PAM100
NO
pi n 6 : 1.2V
?
YES
NO
12
: -5dBm?
YES
PAM100
U100
pin31 :
NO 7~11dBm?
YES
U100
NO
pin17 13MHz
Vp-p :950mV
U100
U100 change or
11
resolder
UCP300
NO
check &
change
3
BATTERY, BATTERY C ONNECTOR
check & change
UCP300 check & change
6
NO
pin 3 : 13MHz
Vp-p : 950mV
YES
change or reso lder
3-25
Flow Chart of Troubleshooting
2
CONTINUS TX ON
CONDITION
MS TX level 19
CH : 190
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
4
5
OSC100 U100
YES
change or
resolder
NO
OSC100