Nokia NSW-6 Series Disassembly & Troubleshooting Instructions page 26

NSW-6
Disassembly & Troubleshooting
Apply 879.00 MHz
–116dBm , 8kHz dev, 1
kHz sine signal to
the antenna pad
Connect EXT HS to
audioanalyzator, open
AF: 1 kHz sine signal,
meas SINAD
Check UHF Vcnt at C822
V: 2.0 ..3.5 V
Check 3 multiplier
output level C745
V: >80 mVpp ?
Apply 879.00 MHz
–50dBm , sine signal
to antenna pad.
Check input level
at duplex filter (Z910)
P: ≅50 dBm
Check input level at
frontend (N701) input
P: ≅ –55dBm
Check output level at
P: >–50 dBm
Check MXR RF level
Check MXR IF level,
F= 116.19 MHz
Page 26
Y
audio
AF: >12 dB
N
N
N
Start synthesizer
Y
N
Start synthesizer
N700 troubleshooting
Y
N
Change diplexer
input Z970
Y
N
Change duplex filter or
pin7
Y
N
LNA out
Change N701
pin10
Y
N
Change RX band filter
pin12
P:≅–55dBm
Y
N
Check LO input level at
N701, pin1 P ≅ 0dBm
P:≅–50dBm
Y
E Nokia Mobile Phones Ltd.
PAMS Technical Documentation
AMPS
RX–chain OK
troubleshooting
Note!
Check all soldering and components
in antenna circuit before changing
Note!
Check all soldering and discrete
L701
components of frontend.
Note!
AG2 is on = gain is in low state
N
Note!
Check all soldering
Z701
N
Start synthesizer
troubleshooting
f=995.19 MHz
Y
Note!
Change N701
Check all components around N701
Issue 1 12/99