Samsung GT-E2550 - Page 48

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Flow Chart of Troubleshooting
9-16
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9-2-4.
DCS
1800
TX
*
Refer to the Line(GSM900 Tx path) in service schematic page1
No
No
Yes
Check U100 working
Check UCP200 working
PAM100 VRAMP
Pin
#3 =
High
?
Yes
Check C104
or
Checkbatteryblockworking
No
Yes
No
PAM100 TX_EN
Pin
#4 : 2.8V ?
No
Check UCP200 working
No
Yes
Check PAM100
Pin
#27=-5
dBm
Check RFS100
Pin
#2=2~5
dBm
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 L103,C125,C126
or
Check U100 working
END
GSM1800 MS:
15
PLC,
700
CH
(*
Pad
#4
is visible)
(
C104)
(
C119)
(*
Pad
#2
is visible)
(*
Pad
#3
is visible)
Yes
No
PAM100 RF_SW1
Pin#
5=
High?
Check UCP200 working