Test Procedure - Nokia n81 Service Manual

• Oscilloscope
• Function generator (sine waveform)
• Current probe (Internal handsfree PWM output measurement)
• Phoenix service software
• Power supply 3.7V

Test procedure

Ausio can be tested using Phoenix audio routings option. Four different audio loop paths can be activated:
• External mic to external earpiece
• External mic to internal earpiece
• External mic to internal handsfree speaker (IHF, mono signal to both speakers)
• Internal mic 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 an can not be changed using phoenix. Correct pins an signals for each test see
following table.
Phoenix audio loop tests and test results
The results presented in the table apply, when no accessory is connected. Earpiece, internal mic and speaker
are in place during measurement. Applying a headset accessory during measurement causes a significant
drop in measured levels.
The gain values presented in table apply for differential output vs single ended input.
Loop test Input
terminal
Ext Mic -> HS-MIC &
Ext Earp GND
Ext Mic -> HS-MIC &
Int Earp GND
Ext Mic -> XMICP &
Int Hands GND
Free
XMICN &
GND
Int Mic -> Acoustica
Int Hands l input,
Free 1khz sine
wave
Measurement data
Earpiece signal
Page 3 –42
Output Path gain
terminal [dB] fixed
HSEARL&G -8.6
ND
HSEARR&
GND
EarP & -10
GND
EarN &
GND
B2150 8,5
B2151 all
terminals
IHF
Speakerp
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Input Differenti
Voltage al
[mVpp] outputvol
tage
[mVpp]
1000 367
1000 310
920 2520
94 dB SPL
RM-179; RM-223
Baseband Troubleshooting
Output DC Output
level [V] current
1,2
1,2
0 ~25mA
each
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Issue 1