User Guide

NPL-4/5 Company confidential
Troubleshooting Instructions Nokia Customer Care
Page 24 Copyright © 2004 Nokia Corporation. All rights reserved. Issue 1 05/04
Figure 15: Receiver Fault Chart 6
Figure 16: Receiver Fault Chart 7
Yes
BB error:
Check UPP
Oscilloscope:
RF-BB serial interface ok?
Oscilloscope:
RX IQ levels ok (RXI, RXQ)?
No
Change RF
ASIC (Helgo)
Change RF
ASIC (Helgo)
Yes
No
Receiver
Fault Chart 6.
Yes
Signal Generator:
Level: –92dBm
Fre
q
uenc
y
: calculated from Phoenix
Phoenix:
SNR measurement ok?
(SNR > 18.37dB)
No
Front end is ok.
Phoenix:
open
SNR Measurement
Meas. Mode: Fast SNR
Press
Measure
.
Single band fault finding
Select faulty band in Phoenix and continue measurements on dedicated Rx part.
Signal Generator:
Level: –55dBm
Frequency: calculated from Phoenix
no offset
Phoenix:
Phone: local mode
RF Controls
:
Active Unit: Rx
Op. Mode:
Continuous
Rx/Tx channel: default (mid)
AGC: 12
Continue with Rx Fault Chart 6.
Receiver
Fault Chart 7.