User Guide

NSW-4
Disassembly & Troubleshooting
PAMS Technical Documentation
Page 35
Issue 1 Final Draft
08/00
 Nokia Mobile Phones Ltd.
Continues from previous page
Check TXIF Z900
Pin7
f: 161.19
MHz
P: >–25 dBm
Change upconverter
N900
Is Z900 Insertion
loss too high?
IL>5 dB
Change filter Z900
Check modulator
output at R925
P
≅
–18dBm
max
Check R925
Is TX I/Q
OK?
V: 0.8 VDC +/– 0.4
V
(symmetrical)
Check
COBBA
I&Q
DACs
(BaseBand)
Change N700
Y
N
Y
N
N
Y
N
Y
Note!
check also I/Q–resistors
R760