SAMSUNG Proprietary-Contents may change without notice
Flow Chart of Troubleshooting
9-15
This Document can not be used without Samsung's authorization
9-2-3. GSM900 TX
No
No
Yes
Check U100 working
Check UCP200 working
PAM100 VRAMP
Pin #3 = High ?
Yes
Check C104
or
Check battery block working
No
Yes
No
PAM100 TX_EN
Pin #4 : 2.8V ?
No
Check UCP200 working
No
Yes
Check PAM100
Pin #27=-5dBm
Check RFS100
Pin#2=2~5dBm
Yes
PAM100 PA_EN
Pin #2="High"
PAM100 VBAT
Pin #30 :3.8V
Check and Change
C152,C100,C101,C102
Check
Main antenna
Yes
Check C119
or
Check U100 working
END
GSM900 MS: 19PLC, 190CH
*Refer to the
Line(Low band Tx path) in service schematic page1
(*Pad #4 is visible)
(C104)
(C119)
(*Pad #2 is visible)
(*Pad #3 is visible)
Yes
No
PAM100 RF_SW1
Pin#5=LOW?
Check UCP200 working