Nokia 616 Service Manual page 126

TFE-4RV-1
Troubleshooting
Perform the Test:
Basic Setup:
A Loop is switched internally to send the HF-Mic signal to the HF-Speaker and in a sec-
ond step the HDMIC signal to the HD Speaker. Blowing into the microphone shall be
hearable in the speaker. By activating the hands free speaker mute, the Loop has to be
opened (no signal goes through). When the headset is connected, blowing into handset
microphone shall be hearable at the handset speaker. By activating the handset speaker
mute, the Loop has to be opened (no signal goes through).
Extended Setup:
In this case, a Loop is switched internally to send the HF-Mic signal to the HF-Speaker
and in second step the HD-MIC to the HD-Speaker. The frequence of 1000Hz has to be
tested. Additionally the distortion has to be checked. By activating the hands free
speaker mute or the handset speaker mute option within the Digital I/O tests the regard-
ing Loop has to be open.
The Bias Voltage of the HF-MIC is to be measured with Voltmeter (<>5V).
MIC-Path
HDMIC
HFMIC
Page 6-30
Company Confidential
Figure 11: Audio-Test
Generator
Frequency
Voltage
1000 30mV.
1000 50mV
Copyright © 2005 Nokia Corporation
Company Confidential
Nokia Customer Care
Low
Limit
440mV (30dB) 705mV (40dB)
1280mV (15dB) 2050mV (20dB)
Upper
Limit
Issue 2.0 Mar/2005