Rf Signal Diagram In Gsm900 Rx Mode - Motorola C168 Manual

1.2.4 RF signal diagram in GSM900 Rx mode

GSM900 Rx fail
(BB Lives)
Check if C617
has input RF No
signal
Yes
Check if L606
has input RF
signal
Yes
Check if C609,
C610 has input
RF signal
Yes
Check
TP605~608 if
No
RxIQ waveform
is correct
Yes
Defective U202
Defective
CON601
No
Defective
No
U602 or L606
Check if U604
Pin 1, Pin2 and
Pin3 has correct
waveform
Yes
Defective U604
Fault Finding chart of GSM900 Rx part
Check if
U607 Pin 10 = 0V
& U607 Pin 2 = 0V
Yes
Defective U607
Defective
No
U201
Defective U608
No
or U201
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