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Flow Chart of Troubleshooting
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9-19
9-12. GSM900 Transmitter
R123
≥2.5V
Cheak PMIC
TX ON (5 Level)
VCO100 pin1
≥2dBm
U100(ASM) pin13
<= 20dBm
C108 ≥25dBm
Resolder VCO100
Resolder PAM100
Yes
No
No
No
Yes
Yes
Yes
Yes
No
R120
≥0.2V
Check VCO100 & U102
Yes
No
END
Check UCP300(MSM)
Replace U100(ASM)
Summary of Contents for SGH-Z400
Page 32: ...8 PCB Diagrams 8 1 Top ...
Page 33: ...PCB Diagrams 8 2 Bottom ...