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Flow Chart of Troubleshooting
9-22
9-12. GSM850 Receiver
RX ON
Cell Power : -60dBm
PAM100 PIN15
≥
-65dBm
Yes
Resolder RFS100, L100, L101, L102,
C103, C181,C123
No
Yes
No
Check F101 PIN1 =
L
F101 Pin 5, 6
≥
-68dBm
Check ANT Switch
control circuit
No
Yes
Resolder F101
Yes
U103
pin A1
≥
-70dBm
pin B1
≥
-70dBm
Resolder C116, C117, L104
No
Yes
U103 pin
4,6,7,12,26,32,34
≥
2.
8V
No
U103 pin 27, 28, 29,
30
≥
0.2Vp_p
No
Check & Resolder
C127,C128,C138
Yes
Yes
Resolder U103
Check U200
END