Pcs Transmitter - Samsung SGH-X105 Service Manual

SGH-X105 Flow Chart of Troubleshooting

11. PCS transmitter

NO
F40 0 pin 13 :
about 2~3 dBm?
YES
CN40 0, R40 2
NO
check&change
C42 0 : 3.7 V?
YES
Between
R40 8& U402
:1.2V?
YES
NO
R100 5:
≒ -5dBm ?
YES
C42 7 : 3V?
YES
U4 02
change or re solder
NO
U40 1
pin9 ,10,12 ,13
U1 00 pin3 9,C11 1
:-20dBm ?
change or re solder
YES
NO
U40 1
pin5,6 ,7,8 :1.7V ?
YES
U2 00
U4 02
change
change o r resolder
NO
F4 00
pin9 : 2.8 V?
YES
Between
F400&L407 :
≒4~5dBm?
YES
F400
check & change
NO
BATTERY, U1 00
check & change
NO
NO
U2 00
check
U401
pin14,2 3,26,3 2 :
2 .8V ?
YES
NO
U40 3pin5,25,2 8
: 3V ?
YES
U40 3
pin 7 : 13MHz?
Vp-p: 95 0mV
YES
U40 3
pin9 ,10,11 ,1213
: 3V?
YES
U4 01
change o r resolder
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
U 200,Q20 4
check & change
NO
R408
U2 00
check & change
check
YES
NO
U1 00 pin3 3,C11 8
change or re solder
NO
NO
U2 00
check or change
4-15
CONTINUOUS TX ON CONDITION
CH : 698 CH(DCS),660CH(PCS)
TX POWER CODE: 350 CODE Aplied
RBW : 10 0KHz
VBW : 100KHz
SPAN : 10 MHz
REF LEV. : 10dBm
ATT. : 20 dB
NO
OSC400
OSC40 0
pin 3 : 13MHz?
change o r resolder
Vp-p : 950 mV
YES
NO
OSC400
U1 00 pin3 3,C11 8
pin 4 : 3 V ?
change or re solder
YES
U4 03
change o r resolder