Nokia RM-555 Service Manual page 135

RM-555
BB Troubleshooting and Manual Tuning Guide
Loop test
HP Mic to AV Acoustical
Earpiece input, 1kHz
sine wave
External Mic in HS_MIC &
Internal GND
handsfree out
Measurement data
Earpiece signal
Figure 48 Single-ended output waveform of the AV Mic to HP Ear measurement when earpiece is connected.
Integrated handsfree signal
Figure 49 Single-ended output waveform of the Ext_microphone in Int handsfree out loop measurement when speaker is
External output from AV
Issue 1
Input Output
terminal terminal
HS_EAR_L &
GND
HS_EAR_R &
GND
B2153
B400
connected (measured at speaker pads). No filter is used.
COMPANY CONFIDENTIAL
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Path Input Output
gain voltage voltage
[dB] [mVp- [mVp-p]
(fixed) p]
NA 94 dB 100
SPL
1000
Output Output
DC level current [mA]
[V]
NA
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