Dcs Rx - Samsung SGH-C250 Service Manual

3-2-2. DCS RX

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NORMAL CONDITION
catch the channel?
YES
PAM300 CHECK
pin12 ≥ -65dBm ?
YES
PAM300 CHECK
pin20 ≥ -65dBm ?
YES
F300 CHECK
pin3,4 ≥ -65dBm ?
YES
U300 CHECK
pin27,28 ≥ -65dBm ?
YES
U300
pin 17 : 2.8V ?
YES
U102 CHECK
NO
pin 19,20 :
26MHz ?
Vp-p : 380mV?
YES
U300
pin 2,3,22,23 Vp-p
: 120mV ?
YES
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UCP101 CHECK!!
3-17
Flow Chart of Troubleshooting
NO
CHECK
ANT contact ?
NO
PAM300,RFS300
resolder or change
NO
PAM300
resolder or change
NO
F300
resolder or change
NO
C310,C312,L304
resolder or change
NO
UCP101 pinA13,
C115
change or resolder
OSC300
⑦
change or resolder
NO
U300
resolder or change
CONTINUOUS RX ON
RF INPUT : 698CH
AMP : -50dBm
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