FM radio troubleshooting
Troubleshooting flow
Audio troubleshooting
Audio troubleshooting test instructions
Single ended external earpiece and differential internal earpiece/IHF outputs can be measured either with a
single ended or a differential probe.
When measuring single ended, each output is measured against ground.
Note:
Do not connect ground of single ended probe to 2nd signal of differential lines.
Internal handsfree output is measured using a current probe, if a special low-pass filter designed for
measuring a digital amplifier is not available. Note also, that when using a current probe, input signal
frequency must be set to 2kHz.
The signal for input is single ended.
Required equipment
The following equipment is needed for the tests:
RM-179; RM-223
Baseband Troubleshooting
Issue 1
COMPANY CONFIDENTIAL
Page 3 –41
Copyright © 2007 Nokia. All rights reserved.
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Страница 157: ...RM 179 RM 223 RF troubleshooting Issue 1 COMPANY CONFIDENTIAL Page 4 47 Copyright 2007 Nokia All rights reserved ...
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