Headset - Nokia RH-109 Service Manual

Headset

Page 3-22
Set Headset mode
•Detection
•Earphone detection Check
Issue
•Headset
•Headset Output Check
Receiver
Issue
•Headset
•Mic Input Check
Mic Issue
•Send Key
•Button signal Check
Issue
J701
COMPANY CONFIDENTIAL
Copyright © 2008 Nokia. All rights reserved.
BB Troublesh0oting and Manual Tuning Guide
Check signal path
-R711, L701, C711, VR704
-R710, L700, C710, VR703
-Headset and U100
Check Mic Bias
-R702,C702: about 1.5V
Check signal path
-Headset, C706, U100
Check SEND_END_N
-L702, R713 : 1.8V to 0V
-Headset and U100
VR703
VR704
R712 L702
L701 L701
R711 R711
C701 C701
Check EAR_DET_N
-R712 : 1.8V to 0V
RH-109
Issue 1