User Guide

CCS Technical Documentation RF Troubleshooting Instructions
RH-12/RH-28
Issue 1 02/04 Nokia Corporation Page 7
N500 Helgo troubleshooting
N500 HELGO troubleshooting
Set Phoenix to RF local burst RX mode
Measure N500 reference voltage:
.
VrefRF01 = 1,35V (C549)
Measure N500 Helgo supply voltages:
- VR1 at C551 - 4,75V?
- VR2 at C520 - 2,8V?
- VR3 at C503 - 2,8V?
- VR4 at C554 - 2,8V?
- VR5 at C553 - 2,8V?
- VR6 at C555 - 2,8V?
- VR7 at C297 - 2,8V? (located at BB bottom grid S3)
Measure N500 serial bus signals
- RfBusClk at J501
- RfBusEna1 at J502
- Reset at J503
- RfBusData at J509
All measured in Burst Mode
Logic high level = 1,8V.
NOK
Check baseband.