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Flow Chart of Troubleshooting
9-34
9-18. PCS Transmitter
F101 Pin13
≥ 25dBm
TX ON (0Level)
Check F101
pin9 = H (2.6V),
pin11 = L
F101 pin8
≥ 25dBm
U102 pin17
≥ 25dBm
U102 pin1
≤ -4dBm
Resolder F101
Check ANT Switch
control circuit
Resolder or Change
C122, L113, L114
Yes
Check U102
pin2,3,4,5,6 OK?
Resolder or Change U102
Check +VBAT or PAM
control signal
No
No
No
Yes
Yes
No
Yes
Yes
Yes
Yes
No
No
No
Yes
END
Check UCP200
Resolder U104
Yes
Resolder RFS100, C110, L106
U104 pin 4,5,6,7
≥ 0.2Vp_p
U104pin11,12,16,29,
32,33,36≥2.8V
pin 10≥1.8V
No
Check & Resolder
C131,C134,C135