Display Backlight Troubleshooting; Audio Troubleshooting; Audio Troubleshooting Test Instructions - Nokia RM-645 Service Manual

RM-645
BB Troubleshooting and Manual Tuning Guide

Display backlight troubleshooting

Troubleshooting flow

Audio troubleshooting

Audio troubleshooting test instructions

External earpiece, internal earpiece and internal handsfree outputs can be measured either with a single-
ended or a differential probe.
When measuring with a single-ended probe each output is measured against the ground.
The input signal for each loop test is single-ended.
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