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Flow Chart of Troubleshooting
9-20
9-14. DCS Transmitter
U101
pin 11,12,16,17,29,
32,33,36 ≥2.8V
pin10≥1.8V
No
Change or Resolder
U101
Check UCP200
END
No
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
No
No
No
No
Check
C122,C124,C126
Check VBAT or PAM
control signal
Resolder or Change
U100
Check U100
pin4,5,6,7 OK?
Yes
U101 pin 4,5,6,7
≥ 0.2Vp_p
Resolder C105, L110
Check ANT Switch
control circuit
Change or Resolder F100
U100 pin7
≤ -2dBm
U100 pin18
≥ 30dBm
F100 pin17
≥ 30dBm
Check F100
pin14 = H (2.6V),
pin10 = L
TX ON (5Level)
Resolder RFS100, C101, L101
F100 pin11
≥ 30dBm