User Guide

NSW-4
Disassembly & Troubleshooting
PAMS Technical Documentation
Page 38
Issue 1 Final
Draft 08/00
 Nokia Mobile Phones Ltd.
Check VAPC
V:>2.5 V
Check PA input
power
P:> 0 dBm
Check TXC
Typ 1.5V@PL2
Change
PA
Y
Y
N
Start powercontrol
troubleshooting
Check Z975 filter
Insertion loss
IL>4dB
Change
Z975
Check TX–driver
input P:> –20dBm
Change
N951
Check COBBA
TXCDAC
(BaseBand)
Y
N
N
Y
N
Y
N
Y
N
Check N980
upconverter
output
P:> –20 dBm
Check Z950 insertion
loss. Max 4 dB.
Check TX–IF
P:> –35 dBm
f: 196.23 MHz
Check Z900
insertion loss. If >
4dB, check R926
and C923 or
change N700.
N