Nokia NSW-6 Series Disassembly & Troubleshooting Instructions page 28

NSW-6
Disassembly & Troubleshooting
Apply 879.00 MHz
–50dBm signal to
antenna interface
Check RF level of
COBBA_D
Check UHF VCO PD2
V: 2.0...3.5 V
Check 3 multiplier
output level at C745
V: >80 mVpp
Check input level
at duplex filter (Z910)
input
Check input level at
frontend N701, pin7
Check output level at
LNA out, pin10
Check MXR RF level
pin12
Check MXR IF level,
F= 116.19 MHz
pin14,
Page 28
NOTE! If AMPS RX check is OK, then only
components in AGC1, OUT_rx, IN_rxif and
OUT_rxif –lines needs to be checked.
Y
TDMA800
RX–chain OK
N
N
N
Start synthesizer
troubleshooting
Y
N
Start synthesizer
troubleshooting
Y
N
Change diplexer
Y
N
Change duplex filter or
L701
Y
N
Change N701
Y
N
Change RX band filter
Z701
Y
N
Check LO input level
of of N701, pin1
f=995.19 MHz
Y
Change N701
E Nokia Mobile Phones Ltd.
PAMS Technical Documentation
Note!
Check all soldering and components
in antenna circuit before changing
Note!
Check all soldering and discrete
components of frontend.
Note!
AG2 is on = low gain state
N
Note!
Check all solderings
N
Start synthesizer
troubleshooting
Y
Note!
Check all components around N701
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