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SAMSUNG Proprietary-Contents may change without notice
SGH-P400 Flow Chart of Troubleshooting
3-
13
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U1005 CHECK
pin15 ≥ -65dBm ?
7. EGSM Reciever
CONTINUOUS RX ON
RF INPUT : 62CH
AMP : -50dBm
NORMAL CONDITION
catch the channel?
Check soldered status of
L1000, L1003
U901
pin 12,13≥
-20dBm ?
U1005 CHECK
pin1, 2 ≥ -65dBm ?
U901 CHECK
pin21,22 ≥ -65dBm ?
U902 CHECK
pin5,25,28 :
3V ?
CN1001
resolder or change
U1005
resolder or change
C1003,C1004,L1001
resolder or change
U100pin33 , C110
check or resolder
U902 CHECK
pin 7 : 13MHz ?
Vp-p : 860mV?
U902 change or
resolder
U901 CHECK
pin
14,23,26,32:
clean 2.8V?
C804,R803
resolder
OSC801 change or
resolder
U100pin39, C111
check or resolder
U901 pin3,4
Vp-p :
240mV?
U900 CHECK
pin6, 20 : 2.8V ?
U900
resolder or change
U901 pin1, 2
Vp-p : 250mV
?
U901
resolder or change
U900 pin
2,3,4,5 Vp-p
: 100mV ?
CHECK
U700
NO
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
OSC801 CHECK
pin 3 : 13MHz ?
Vp-p : 950mV?
U100pin33, C110
check or resolder
NO
OSC801
CHECK
pin 4 : clean
3V ?
NO