Nokia 301 Service Manual page 167

RM-839; RM-840; RM-841
System Module
AV connector
3.5mm Pin #
SW1
L
R
MIC
SW2, GND
Issue 1
Figure 59 External MIC bias circuit
Figure 60 AV connector
Signal name
PLUGDET
HS EAR L
HS EAR R
HS MIC
HS GND
NOKIA INTERNAL USE ONLY
Copyright © 2013 Nokia. All rights reserved.
Direction
Input
Output
Output
Input
-
Description
Terminal internal
connection, plug detection
Audio output
Audio output
Microphone audio
Ground contacts
Page 6 – 29