Motorola C168 Manuale - Pagina 13
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1.2.3 RF signal diagram in DCS1800 TX mode
DCS1800 Tx fail
(BB lives)
Check if R602, C612
has modulated RF
signal
Yes
Check if C623 has
amplified RF signal
Yes
Check if C617 has
NO
amplified RF signal
Yes
Defective CON601
No
No
Check if U607 Pin
10 = 0V & U607 Pin
2 > 2.8V
No
Yes
Defective U608
Defective U607
Fault Finding chart of DCS1800 Tx part
Check if
TP605~608
have TxIQ sin
Check if
TP614 has
Defective U604
ramp signal
No
Yes
Defective
Defective
U605 (PA)
U202
or U201
Defective U201
No
or U202
wave
Yes
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