User Guide

SAMSUNG Proprietary-Contents may change without notice
SGH-E400 Flow Chart of Troubleshooting and Circuit Diagrams
4-11
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2. DCS Receiver
CONTINUOS RX ON
RF INPUT : 698CH
Cell power : -50dBm
NORMAL CONDITION
catch the channel?
F1002 CHECK
pin13 ≥ -65dBm?
F1002 CHECK
pin6 ≥ -65dBm?
U901 CHECK
pin17,18 ≥ -65dBm?
CHECK
C1012,L1015,L1016 contact?
NO
CN1001
resolder or change
NO
F1002
resolder or change
NO
C1014,C1017,L1002
resolder or change
NO
YES
YES
YES
U901
pin 12,13 ≥
20dBm?
U902 CHECK
pin5,25,28 : 3V?
U902 CHECK
pin 7 : 13MHz?
OSC801 CHECK
pin 3 : 13MHz ?
V p-p : 950mV?
OSC801 CHECK
pin 4 : clean 3V?
U901 CHECK
pin14,23,26,32 :
3V?
U901 Pin3,4
Vp-p:240mV ?
U900 CHECK
pin 6,20 : 2.8V?
U901 Pin1,2
Vp-p:250mV ?
U900 Pin2,3,4,5
Vp-p:100mV ?
U100, PIN39, C116
check or resolder
U902
change or resolder
C808, R805
resolder
OSC801
change
U100, PIN 46, C114
resolder or change
U900
resolder or change
L1006,C1015,C1019
resolder or change
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES YES
YES YES
YES
YES
YES
YES
YES
YES