Samsung SGH-X105 Service Manual page 24

10. PCS Reciever
CONTINUOUS RX ON
RF INPUT : 660CH
AMP : -50dBm
NORMAL CONDITION
catch the channel?
YES
F40 0 CHECK
pin13 ≥ -65dBm ?
YES
F40 0 CHECK
pin6 ≥ -6 5dBm ?
YES
F40 1 CHECK
pin4,6 ≥ -65dBm ?
YES
U401 CHECK
pin17,1 8 ≥ -65 dBm ?
YES
U4 01
pin 12 ,13≥
-20 dBm ?
YES
U401 CHECK
pin 1 4,23,2 6,32:
clean 2.8 V?
YES
U401 pin3,4
Vp-p : 240 mV?
YES
U4 01 pin1,2
Vp-p : 25 0mV ?
YES
U40 0 pin 2 ,3,4,5
Vp-p : 1 00mV ?
YES
NO
Check soldered status of
R402 ,L4 01
NO
CN40 0
resolder or change
NO
F4 00
reso lder or change
NO
F4 01
reso lder or change
NO
C41 5,U41 5,L404
reso lder or change
NO
U4 03 CHECK
pin 25 ,28 : 3V ?
YES
U403 CHECK
pin 7 : 13 MHz ?
Vp-p : 8 60mV?
YES
U403 change or
resolder
NO
U1 00pin39, C11 1
check or resolder
NO
U4 00 CHECK
pin6, 20 : 2.8 V ?
YES
U40 0
resolder or change
NO
U401
resolder or change
NO
CHECK
U200
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SGH-X105 Flow Chart of Troubleshooting
NO
U10 0pin33 , C11 8
check or resolder
NO
OSC400 CHECK
pin 3 : 13 MHz ?
Vp-p : 9 50mV?
YES
C439
resolder
NO
U10 0pin33 , C11 8
check or resolder
4-14
NO
NO
OSC400 CHECK
pin 4 : clean 3V ?
YES
OSC4 00 change or
resolder