Fault Finding Chart For Uhf Vco - Nokia NSB-1 Series Troubleshooting Instructions

NSB–1/3
Troubleshooting Instructions

Fault finding chart for UHF VCO

–RX cont mode.
PLUSSA pin 24:
N
RX:f:1443.2–1502.8MHz
P:0dBm
TX:1450.2–1509.8MHz
P:–1dBm
C774,R760,R758,
N
CRFU2a pin 1
and 14:2.8V
Check connection
of R701 and
C700:2.7V
Check control signal
N
from R703:
RX:1.4...3.3V
TX:1.7...3.5V
This is also visible at
PLUSSA pin 27.
Change
module
G701
Page 18
Check C775
and C710
N
Check CRFU2a
CRFU2a pin
pin 16: Same as
1 and
PLUSSA pin 24!
14:2.8V
P:0dBm
Check
C773 and R759.
Check V720:
c:2.6V
VSYN_A
missing. Goto
BB troublesh.
Check
R702,R703,R704,
C703 and C702.
Technical Documentation
N
N
Check
Goto BB
C671,C704,C761
troublesh.
and C706
PAMS
Original 06/98