User Guide

Troubleshooting flow

Audio troubleshooting

Audio paths

The earpiece is driven directly by a built-in linear power amplifier included in the EM ASIC N2200 ASIC. The

output has a differential output configuration. Signal lines are biased by the EM ASIC N2200.

The vibra is driven directly by a built-in digital pulse modulated amplifier included in the EM ASIC N2200 ASIC.

The output has a differential output configuration.

Nokia AV stereo output is driven by a discrete stereo headphone amplifier that is connected to the single-

ended outputs of the EM ASIC N2200 ASIC (shared output with the discrete stereo speaker amplifier). The

discrete stereo headphone output has a single-ended ground reference output. It’s controlled gain change

via I2C IF.

RM-313

BB Troubleshooting and Tuning Guide

Issue 1 COMPANY CONFIDENTIAL Page 3 –63