Samsung SGH SGH X105, Руководство по обслуживанию

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