Sharp GX15 Service Manual page 61

10. Out of range and incoming/outgoing calls are impossible.
[Checkpoints in RF Test Tool]
Is transmission possible using RF Test Tool?
YES
[Sender]
Is frequency signal sent to FL803?
EGSM900 band ...................... IC803 pin 15
DCS1800/PCS1900 bands ..... IC803 pin 13
Is frequency signal supplied to pin 1 of FL905?
Is frequency signal supplied to pin 1 of J801?
J801 is defective.
[Receiver]
Is frequency signal sent from FL902 or FL903?
EGSM900 band ........................... FL902 pins 6, 7
DCS1800 band ............................ FL902 pins 8, 9
PCS1900 band ............................ FL903 pins 3, 4
Is frequency signal supplied to FL902 or FL903?
EGSM900 band ........................... FL902 pin 4
DCS1800 band ............................ FL902 pin 1
PCS1900 band ............................ FL903 pin 1
Is frequency signal supplied to pin 9 of FL803?
FL905 or J801 is defective.
CONFIDENTIAL
NO
YES
YES
YES
NO
NO
NO
2 – 53
Main PWB-A is defective.
NO
NO
FL803 is defective.
NO
FL905 is defective.
Main PWB-A is defective.
YES
FL902 or FL903 is defective.
YES
YES
FL803 is defective.
GX15