Motorola C168 Manuel - Page 12

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Motorola C168 Manuel

1.2.2 RF signal diagram in GSM900 Tx mode

GSM900 Tx fail
(BB lives)
Check if R603, C611
has modulaed RF signal
Yes
Check if C613 has
amplified RF signal
Yes
Check if U607 Pin
Check if C617 has
NO
10 > 2.8V & U607
amplified RF signal
Yes
Defective U607
Defective CON601
No
Defective U608
No
or U201
Pin 2 = 0V
Yes
(T/R switch)
Fault Finding chart of GSM900 Tx part
No
Check if
TP614 has
ramp signal
No
Yes
Defective
Defective
U202 or
U605 (PA)
U201
Check if
Defective U201
No
TP605~608
or U202
have Sine wave
Yes
Defective U604
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