Nokia RM-429 Service Manual page 78

Required equipment
The following equipment is needed for the tests:
• Oscilloscope
• Function generator (sine waveform)
• 'Active speaker' or 'speaker and power amplifier'
• Phoenix service software
• Battery voltage 3.7V
Test procedure
Audio can be tested using the Phoenix audio routings option. Three different audio loop paths can be
activated:
• External microphone to Internal earpiece
• External microphone to Internal handsfree speaker
• External microphone to External earpiece
Each audio loop sets routing from the specified input to the specified output enabling a quick in-out test.
Loop path gains are fixed and they cannot be changed using Phoenix. Correct pins and signals for each test
are presented in the following table.
Phoenix audio loop tests and test results
The results presented in the table apply when no accessory is connected and battery voltage is set to 3.7V.
Earpiece, internal microphone and speaker are in place during measurement. Applying a headset accessory
during measurement causes a significant drop in measured quantities.
Loop test
terminal
External Mic to XMICP and
External GND
Earpiece
External Mic to XMICP and
Internal GND
Earpiece
External Mic to XMICP and
Internal GND
handsfree
Page 3 –34
Input Output
terminal
HS_Ear_L
and GND
EarP and
GND
EarN and
GND
B2101 pads
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Path Input
gain [dB] voltage
(fixed) [mVp-p]
0.8 1000
-0.5 1000
N/A 1000
Differential Output
output DC level
voltage [V]
[mVp-p]
1100mV 0.5
940mV 1.2
Square with 1.9
amplitude
equal to
VBAT
RM-429
Output
current
[mA]
N/A
N/A
N/A
Issue 1