Samsung SGH-C140 Service Manual page 31

3-2-4. DCS Tx
Check U400 pin
16 : about 2~3
dbm?
Yes
1
Check and
change
RFS400,
L300,L301
PAM400 pin 7 :
3.7V ?
PAM400 pin 8 :
1.2V ?
PAM400 pin 12 :
about -5dbm?
PAM400 pin 6 :
3V ?
PAM400
change or resolder
No
Check U400
pin 6 : 2.8V ?
Yes
No
PAM400 pin 1 :
about 4~5dbm?
Yes
U400
check & change
No
Battery,
check & change
Yes
No
PAM400
Yes
No
Yes
No
UCP101
check
Yes
No
Check and change
UCP201,UCP101
2
3
1
4
PAM400
3
5
7
check
6
U400 pin
12,13,28,29 : 2.9V ?
Yes
U400
change or resolder
3-19
Flow Chart of Troubleshooting
CONTINUS TX ON CONDITION
TX POWER DAC : 560 CODE
APPLIED
CH : 698CH(DCS), 660CH(PCS)
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV : 10dBm
ATT : 20dB
2
4 5 6 8
2
No
UCP101
change or resolder
7
8