User Guide

Issue 1 04/2005 COMPANY CONFIDENTIAL 13
Copyright © 2005 Nokia. All Rights Reserved.
RM-94
6(b) - RF Troubleshooting Nokia Customer Care
Make sure that
Synthesizer is working
see
Synthesizer Fault
Finding Tree
Receiver
Fault Finding Tree
part 1
Rx chain is functional
and calibrated
Selected band is working and
calibrated.
A
re all 3 bands measured?
Yes
No
Yes
Signal Generator:
Level: –80dBm
Frequency: calculated from
Phoenix + 67.71kHz
No
Phoenix:
Phone: local mode
Open
RF Controls
:
Active Unit: Rx
Op. Mode: Burst
Rx/Tx channel: default (mid)
All 3 bands
Phoenix:
Open
RSSI reading
Check RSSI Level = -80dBm
Yes next bandNo
= To be done in all
three bands.
Execute Rx Calibration in selected
band, refer to chapter 9.2.1
A
re calibration results within limits?
Yes
No
A
re all 3 bands measured?
No
Yes
Continue with single
band fault finding.
Yes
Receiver
Fault Finding Tree
part 2
Are all 3 bands defective?
No
No
Check supply filter
components (C2233,
C7519, C7520) and UEM
Oscilloscope:
Check supply voltages of RF ASIC:
VR4 = 2.8V ? (TP: VR4)
Yes
Receiver
Fault Finding Tree
part 3
Oscilloscope:
Check supply voltages of RF ASIC:
VR6 = 2.8V ? (TP:VR6)
Yes
No
Check supply filter
components (C2231,
C7521) and UEM