Accessory Detection; Fig 8 Fault Tree, Accessory Detection - Nokia RH-13 Series Troubleshooting Manual

RH-13
Troubleshooting

Accessory detection

• - Start phone to normal mode when checking accessory detection.
• - Ad- converter value of headint and hookint - lines can be checked with Phoenix
ADC-reading.
• - When headset HDC-9 connected and headset push button is held down, head-
int- value should be between 10 and 50 and hookint- value between 0-30.
Accessory detection
doesn't work normally
Check HeadInt and
HookInt ad-value with
- HeadInt and HooInt
Check headint-line
L152,C150,R152,C153,
C160,R153,R150,C159
L159,R163,C158,R155,
Page 20
Figure 8: Fault tree, accessory detection
Phoenix
(No accessory
connected)
~1000
Fail
R154,
Ok
Check hookint-line
R151,C161,V152
Ok
Check bottom
connector
Ok
Change UEM
ãNokia Corporation
CCS Technical Documentation
Connect HDC-9 and keep the
HDC-9 switch close while
reading headint and hookint
Ok
ad-value.
Both values should go close to
zero (~0...50)
Fail
Ok
Calibrate ADC
and check
accessory
detection again
Issue 1 11/02