RM-801; RM-819 (Nokia Lumia 800) 
BB Troubleshooting and Manual Tuning Guide 
 
Page 3-28  COMPANY CONFIDENTIAL  Issue 1 
  Copyright © 2011 Nokia. All rights reserved. 
 
Audio Loopback test 
Displayed data: 
-  none 
Us
er can change settings for: 
-  A
udio routing output 
•  Head
set 
•  Earpiece 
•  Loud speaker 
-  Hea
dset audio channel (left/right) 
Us
er can test: 
-  P
ressing ”Loopback On/Off” button starts/stops playback of audio received from the microphone with a 
slight delay 
-  The A
udio routing will be transferred based upon the output location select 
-  W
hen the output is set to headset, then user has an option to test headset channels (left/right) – a short 
clip will be played 
-  When user selects start loopback when output is set to headset, then the channel test is disabled 
Pressing the back ‘’ key will navigate back to the main menu