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Flow Chart of Troubleshooting
9-11
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9-2-2. DCS RX
NORMAL CONDITION
catch the channel?
CHECK
R722
contact ?
U701
pin 34 : 2.9V ?
Pin1,13,22,32 : VBAT?
F700 CHECK
pin3,4
≥
-65dBm ?
F700,L700,C700
resolder or change
F700
resolder or change
U100, C110
change or resolder
U701 CHECK
pin 21 : 26MHz ?
Vp-p : 1.1V?
OSC 700
change or resolder
U701
resolder or change
U100
CHECK!!
U701
pin 35,36,37,38
Vp-p : 100mV ?
NO
YES
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
①
②
U701 CHECK
pin8,9
≥
-65dBm ?
L704,L705
resolder or change
YES
NO
F700 CHECK
pin13
≥
-65dBm ?
④
⑥
⑤
③
CONTINUOUS RX ON
RF INPUT : 698CH
AMP : -50dBm