Nokia NKC-1X Series Troubleshooting Instructions page 23

CCS Technical Documentation
Check input level
at diplexer (Z907)
input.
Y
Check input level at
duplex filter. You can
also check level at
diplexer output
Y
Check input level at
.
LNA input (J800).
Y
Check RF level at
RX800 band filter
input.
Y
Check RF level at
.
MIX1_A input.
MIX1Ain P/N
Y
Issue 1 02/03
N
Change EXT RF
Connector
N
Change diplexer Z906
N
Change duplex filter
(Z906)
N
TACO
Change SAFARI
(N801)
N
Change SAFARI TACO
(N801)
Nokia Corporation
Troubleshooting Instructions
Note!
Check all soldering and components
in antenna circuit before changing
Note!
Check all soldering and discrete
Z907
components of frontend.
N
Note!
Check all solderings and discrete
copmponents around SAFARI
before changing
Note!
From the begin to MIX_1A input
you should see strong RF signal
level at 881.49 MHz. Exact level
is difficult to define here because
variable impedances in RX path.
Also used probe type affects to
the results.
NKC-1X
TACO
Page 23