![background image](http://html.mh-extra.com/html/samsung/sgh-c120/sgh-c120_service-manual_1190366019.webp)
SAMSUNG Proprietary-Contents may change without notice
SGH-C120 Flow Chart of Troubleshooting
2-
15
This Document can not be used without Samsung's authorization
F101
CHECK
pin8
≥
-65dBm ?
2-2.RF
2-2-1. EGSM RX
CONTINUOUS RX ON
RF INPUT : 62CH
AMP : -50dBm
NORMAL CONDITION
catch the channel?
CHECK
ANT
contact ?
U100
pin 12,13,25,26,27:
2.8V ?
F101 CHECK
pin10
≥
-65dBm ?
U100
CHECK
pin21,22
≥
-65dBm ?
F101,RFS100
resolder or change
F101
resolder or change
C127,C129,L107
resolder or change
U300 pinA13, C314
change or resolder
U100 CHECK
pin 30,31 :
26MHz ?
Vp-p : 950mV?
OSC100
change or resolder
U100
resolder or change
U300
CHECK!!
U100
pin 4,5,6,7 Vp-p
: 120mV ?
NO
YES
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
①
③
②
④
⑤
⑥
⑦
⑧
F100 CHECK
pin6,7
≥
-65dBm ?
F100
resolder or change
YES
NO