Nokia 616 Service Manual page 163

Nokia Customer Care
The Audio Block consists of two major parts, the HFAudio-Block, which is responsible for
the handsfree audio functionality, and the HDAudio-Block, which is responsible for the
Headset Audio. Additionally there is a preflight for the B2Bxear lines from the EB and
level shifters for the mute lines. HFAudio interfaces single-ended to the microphone and
to the speaker. The HDAudio path is implemented with symmetric speaker and micro-
phone lines.
Description of Inputs, Outputs and Block-Internal Lines
Signalname
B2BHFMUTE Control Signal to Mute the
HF Amplifier and HF Micro-
phone
B2BHDMUTE Control Signal to Mute the
HD Amplifier
VMIC Powersupply for HF-Micro-
phone
VEBPWR Powersupply for Headset
poweramplifier
VAudio Powersupply for Handsfree
poweramplifier
B2BXEAR_P Symmetric Audio Signal gen-
B2BXEAR_N erated by phoneengine for
HF- and HD-Speaker (Output
selected by HDMUTE/
HFMUTE)
B2BHDMIC_P Symmetric Audio Signal gen-
B2BHDMIC_N erated by Headset Micro-
phone
B2BHFMIC_P Symmetric Audio Signal gen-
B2BHFMIC_N erated by Handsfree Micro-
phone Amplifier
Issue 2.0 Mar/2005
Company Confidential
Description
Control-Inputs
Powersupplies
Audio-Signals
Copyright © 2005 Nokia Corporation.
Company Confidential
TF5 Technical Information
Range When Error then .......
Low: 0..0.5V HF-Amplifier and HF MIC
high: will be always on
1.6..1.8V (when always low)
or both do not work
(when always high)
Low: 0..0.5V HD-Amplifier will be
high: always on
1.6..1.8V (when always low)
or does not work
(when always high)
5V 5% HF-MIC Phantom Voltage
will not work, VBIAS will
be of
Sleepmode: 0V Headset poweramplifier
active: 4.2V 5% will not work
HF Poweramplifier will
not work
No Audio Signal to any
Speaker
No Microphone Signal
from Headset
No Microphone Signal
from Handsfree
TFE-4/RV-1
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