Each audio loop sets routing from the specified input to the specified output enabling a quick in-out test.
Loop path gains are fixed and they cannot be changed using Phoenix. Correct pins and signals for each test
are presented in the following table.
Phoenix audio loop tests and test results
The results presented in the table apply when no accessory is connected and battery voltage is set to 3.7V.
Earpiece, internal microphone and speaker are in place during measurement. Applying a headset accessory
during measurement causes a significant drop in measured quantities.
The gain values presented in the table apply for a differential output vs. single-ended/differential input.
Loop test Input
terminal
Output
terminal
Path gain
[dB]
(fixed)
Input
voltage
[mVp-p]
Output DC
level [V]
Output
voltage
[mVp-p]
External
headset
mic to
earpiece
HS_MIC & GND EAR 1 & GND 0 300 1.35 300
EAR 0 & GND
External
headset
mic to IHF
mono
HS_MIC & GND L4855 &
L4856
10 200 630
L4857 &
L4858
Internal
digital
microphon
e to
headset
Acoustical
Input, 1kHz
sine wave
HS_L & GND NA 94 dBSPL 70
HS_R & GND
RM-750
BB Troubleshooting and Manual Tuning Guide
Issue 1 COMPANY CONFIDENTIAL Page 3 – 27
Copyright © 2011 Nokia. All rights reserved.
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