Samsung SGH-J610 Service Manual page 56

10-2-2. PCS RX
NORMAL CONDITION
catch the channel?
YES
UCD100 CHECK
pin12 ≥ -65dBm ?
YES
U100 CHECK
pin21 ≥ -65dBm ?
YES
U100 CHECK
pin20,21 ≥ -65dBm ?
YES
CHECK the
power source of
UCD100
YES
U100 CHECK
pin34,35 :
26MHz ?
YES
U100 CHECK
pin4,5,6,7 Vp-p :
800mV
YES
UCD300
resolder or change
Flow Chart of Troubleshooting and Circuit Diagrams
CHECK
NO
ANT101,ANT102,L101,
L102,L104,L105,C105,
C113,C139,R106
①
NO
RFS100, C105, L101,L104,L105,
C113
resolder or change
②
NO
UCD100
resolder or change
②
NO
C116,F102,C115,C117,L106
resolder or change
NO
CHECK& RESOLDER
UCD300
NO
OSC100 CHECK
PIN3:26MHz?
YES
CHECK& RESOLDER
③
U100
NO
U100
resolder or change
10-23
CONTINUOUS RX ON
RF INPUT : 660CH
BCH POWER : -60dBm
③
NO
CHECK& RESOLDER
OSC100