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Flow Chart of Troubleshooting
9-32
9-17. PCS Transmitter
- Master only
U100 pin11,12,16,
32,33≥2.8V
pin10≥1.8V
Yes
Resolder U100
Check UCP200
END
No
Yes
No
No
No
Yes
Yes
Yes
Yes
No
Yes
Yes
No
No
No
Check & Resolder
C128,C126,C125,C129
And PMU Part
Check +VBAT or PAM
control signal
Resolder or Change PAM100
Check PAM100
pin2,3,4,5,8 is ok?
Yes
U100 pin 4,5,6,7
≥ 0.2Vp_p
Resolder or Change
C137
Check ANT Switch
control circuit
Change or Resolder F101
PAM100 pin1
≤ -4dBm
PAM100 pin17
≥ 25dBm
F101 pin8
≥ 25dBm
Check F101
pin9 = H (2.6V),
pin12 = L
TX ON (0Level)
Resolder RFS100,C107,R101,R100
F101 pin13
≥ 25dBm
Содержание SGH-D780
Страница 31: ...7 Block Diagrams 7 1 7 1 Functional Block Diagram ...
Страница 32: ...Block Diagrams 7 2 7 2 RF Solution Block Diagram ...
Страница 33: ...8 PCB Diagrams 8 1 Main top view ...
Страница 34: ...PCB Diagrams 8 2 Main bottom view ...