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Level
3
Repair
8-26
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8-4-2.
GSM
900
RX
**
If you check the tx chain,
Check the not only RF Device but also resistor, inductor and capacitor.
Change Main PBA
Normal condition
Catch the channel?
RX ON(Call Connected)
RF Input
:62
CH
Amplitude
:-50
dBm
Yes
Check Ant
100,
ant101
L100,L101,C105
No
PAM100 check
RFS100
≥
-50
dBm
Check RFS100,L100,
L101,C105
No
Yes
Check the connection
C146,L103
Put more lead solder
each terminal
No
Yes
F100 check
C119
≥
3.3V ?
Check C119,L109
No
Yes
Check the connection
C114,C118.L105
No
Yes
Check F100,C114,C118.L105
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