Samsung SGH-P400 Service Manual page 32

11. DPCS transmitter
U1005 pin
NO
10 : about
2~3 dBm?
YES
CN1001, C1000
check&change
C1014 :
3.7 V?
Between
R1008& U1001
: 1.2V?
NO
R1005:
≒ -5dBm ?
C1016 :
3V?
U1001
change
NO
U901
pin9,10,12,13
U100pin39,C11
:-20dBm ?
1
change or
resolder
U901
NO
pin5,6,7,8
:1.7V ?
U700
U1001
change
change or
resolder
U1005
pin11 : 2.8 V?
YES
Between
L1001&L1007:
NO
≒ 4~5dBm?
YES
U1005
check & change
NO
BATTERY, U100
check & change
YES
NO
YES
YES
NO
YES
U700
check
U901
pin14,23,26,32 :
2.8V ?
YES
NO
U902pin5,2
5,28 : 3V ?
YES
U902
pin 7 : 13MHz?
Vp-p: 950mV
YES
U902
pin9,10,11,
1213: 3V?
U901
change or
resolder
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SGH-P400 Flow Chart of Troubleshooting
NO
U702,U703
check & change
R1008
check & change
YES
NO
U100 pin33,C110
change or resolder
YES
NO
YES
NO
U700
check or
change
YES
3-21
CONTINUS TX ON CONDITION
CH:698CH(DCS), 660CH(PCS)
TX POWER CODE:350 CODE
APPLIED
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
NO
U700
check & change
OSC801
pin 3 : 13MHz?
Vp-p : 950mV
YES
0SC801
NO
pin 4 : 3V
?
YES
U902
change or
resolder
NO OSC801
change or
resolder
U100
pin33,C110
change or
resolder