Samsung SGH-P310 Service Manual - Page 57

GSM Receiver

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Flow Chart of Troubleshooting and Circuit Diagrams 9-2.RF 9-2-1. GSM Receiver CONTINUOS RX ON RF INPUT : 62CH Cell power : -50dBm NORMAL CONDITION catch the channel? YES F101 CHECK pin6 ≥ -65dBm? YES F101 CHECK pin 12,13≥ -65dBm? YES UCD100 CHECK pin6,7 ≥ -65dBm? YES UCD100 CHECK pin34 : 2.8V YES UCD100 CHECK Pin19,21:13MHz YES GSM Receiver is ok? NO CHECK C101, C140, contact NO RFS100 resolder or change NO F101 resolder or change NO L101,L102,C137 resolder or change NO UCP300 PIN A13, C313 resolder or change NO TCX100 CHECK NO TCX100 change END NO GSM RX path component resolder or change 9-21 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization

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SAMSUNG Proprietary-Contents may change without notice
Flow Chart of Troubleshooting and Circuit Diagrams
9-21
This Document can not be used without Samsung's authorization
9-2.RF
9-2-1. GSM Receiver
CONTINUOS RX ON
RF INPUT : 62CH
Cell power : -50dBm
NORMAL CONDITION
catch the channel?
NO
CHECK
C101, C140, contact
YES
RFS100
resolder or change
F101 CHECK
pin6
≥
-65dBm?
NO
YES
NO
F101
resolder or change
F101 CHECK
pin 12,13
≥
-65dBm?
YES
UCD100 CHECK
pin6,7
≥
-65dBm?
L101,L102,C137
resolder or change
NO
YES
UCD100 CHECK
pin34 : 2.8V
NO
UCP300 PIN A13, C313
resolder or change
TCX100 CHECK
YES
NO
UCD100 CHECK
Pin19,21:13MHz
YES
NO
TCX100
change
NO
GSM RX path component
resolder or change
GSM Receiver is ok?
END