Samsung SGH-C120 Service Manual page 25

Gsm telephone
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2-2-4. DCS TX
F101
pin 11 :
about 2~3
dBm?
YES
C103,RFS100
check&change
NO
U300
pinA13,C314
change or resolder
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NO
F101
pin2 : 2.8 V?
YES
PAM100
pin16
: about
4~5dBm?
NO
YES
F101
check & change
NO
PAM100
BATTERY
pin4 : 3.7 V?
check & change
YES
NO
PAM100
U300
pin 6 : 1.4V ?
check
YES
PAM100 pin1
about : -5dBm ?
YES
NO
PAM100
pin 3 : 3V?
YES
U300
PAM100
check
change or resolder
U100
NO
pin12,13,25,26,
28 : 2.8V ?
YES
Vp-p : 950mV?
NO
pin4,5,6,7:100m
U300
change or resolder
change or resolder
SGH-C120 Flow Chart of Troubleshooting
NO
U300
check & change
U100
NO
pin30, 31 :
OSC100
26MHz ?
change or resolder
YES
U100
V?
YES
U100
2-21
CONTINUOUS TX ON CONDITION
CH : 698CH(DCS)
TX POWER CODE: 520 CODE Aplied
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB

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