Accessory Detection - Nokia NPC-1 Series Troubleshooting Instructions

PAMS Technical Documentation
Microphone or XEAR line does not work
Microphone doesn't
Run audio-loop
selftest with
R156,C151,C152,C157,L164
microphone
Change UEM

Accessory detection

1 Start the phone in the normal mode when checking for accessory detection.
2 The Ad- converter value of the hookint-line can be checked with the Xmic-
switch on an MJS-18 test jig. Changes normally from high to low when no acces-
sory is connected.
3 When the headset HDC-5 is connected, the hookint- value should be between
600 and 700.
Issue 1 10/01
Figure 5: Fault tree, microphone fail
work
Fail
phoenix
Ok
Check
Ok
Check
Ok
ãNokia Corporation
Troubleshooting Instructions
Feed 1KHz to Mic
by JBA-8 and
measure from Xear
Ok
Fail
Change UPP
NPC-1
Page 15