Troubleshooting with RF-shield removed
Introduction
The RF-shield should not be removed in order to replace single components on the RF block. This chapter
only assists in locating the faulty component for statistical purposes.
Voltage checking
Steps
1. Set up the main board in the module jig. The phone should be in local mode.
2. Check the following:
TP#
Signal name
Test point
Voltage (all bands)
1
VCTCXO (G7500) supply
C7501
2.5V
2
RFIC Vapaus (N7500) supply from DC/DC
converter
C7570
2.8V
3
TXFEM (N7520) supply from DC/DC
converter
C7521
1.3V-3.8V (only when transmitting and
depends on output power).
4
WCDMA PA (N7540) supply from DC/DC
converter
C7528
0.7V-3.1V (only when transmitting and
depends on output power). The value
will be 3.1V when settings as described
in the note below are used.
5
Vbat at WCDMA PA (N7540)
C7512
3.7V (Vbattery)
6
Supply input to DC/DC conv
C7527
3.7V (Vbattery)
Note:
When using settings as shown in the following Tx Control window, the result at TP4 should
be 3.1V.
RM-627
RF troubleshooting
Issue 1
COMPANY CONFIDENTIAL
Page 4 – 23
Copyright © 2010 Nokia. All rights reserved.
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