Nokia 2220 Servicehandbuch

RH-42

Troubleshooting Instructions

CCS Technical Documentation

Page 16

Nokia Corporation Confidential

Issue 2 09/2003

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 800.

Figure 6: Fault tree, accessory detection

Accessory detection

doesn't work normally

Check Headint ad

value with Phoenix

(no accessory

connected

- Headint ~0 *)

Use XMIC switch on

MJS-18 and check

hookint ad value.

Should go from high

(~1000) to low (~0)

Check R151 and

C160

Check R152, C161,

L160

Check R150, R201,

C104, C106, L162,

L163

Check bottom

connector

Change UEM

* On local or test

mode Headint <400

Fail