Accessory Detection - Nokia RH-21 Series Troubleshooting Manual

CCS Technical Documentation
Microphone or XEAR line does not work

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 MJ-8 test jig. Changes normally from high to low when no accessory is
connected.
3 When the headset HDC-5 is connected, the hookint-value should be between
600 and 800.
Issue 1 05/2003 Confidential
Figure 5: Fault tree, microphone failure
Nokia Corporation
RH-21
Troubleshooting
Page 15