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Flow Chart of Troubleshooting
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7-12
U1000
change or resolder
11. DCS transmitter
U1007 pin#8 :
about 2~3 dBm?
CON1, C1015
check&change
U1007
pin#7 : 3 V?
U100
check & change
L1005:
≒ 4~5dBm?
U1000
check & change
C1003 : 3.7 V?
NO
NO
YES
YES
YES
NO
NO
BATTERY, U900
check & change
Between
R1005 & U1000
: 1.2V?
YES
NO
R1005
check & change
NO
U1009:
≒ -5dBm ?
YES
YES
YES
U100
check
NO
U900 pin#3
: 3V ?
U100 pin#39
change or resolder
YES
U900
pin#5 : 1.7V ?
U100
change
NO
NO
U900
change or resolder
YES
U900
pin#8 : 13MHz?
Vp-p : 950mV
U900
pin#10 : 3V?
YES
YES
OSC900
13MHz?
Vp-p : 950mV
OSC900
change or resolder
U100
check or change
OSC900
pin#4 : 3V ?
U100 pin#39
change or resolder
U100
change or resolder
NO
NO
YES
NO
YES
NO
CONTINUOUS TX ON CONDITION
CH : 698CH(DCS),660CH(PCS)
TX POWER CODE: 350 CODE Aplied
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB