Nokia C2-01, Руководство по обслуживанию

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Function generator (sine waveform)
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'Active speaker' or 'speaker and power amplifier'
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Sound level meter
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Current probe
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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
•
Internal 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 a table in the following section.
Phoenix audio loop tests and test results
The results presented in this 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.
The gain values presented in the table apply for a differential output vs. single-ended/differential input.
Loop test Input
terminal
Output
terminal
Path gain
[dB]
Input
voltage
[mVpp]
Output
voltage
[mVpp]
Output
DC level
[V]
Output
current
[mA]
External
Mic to
External
Earpiece
XMICP and
GND
HSEAR R and
GND
16.7 100 680 1.2 NA
HSEAR L and
GND
External
Mic to
Internal
Earpiece
XMICP and
GND
EarP and GND 10.9 100 353 1.2 NA
EarN and GND
External
Mic to
Internal
handsfree
XMICP and
GND
IHF pads 28.1 100 2540 0 112mA
(calc.)
RM-721; RM-722
BB Troubleshooting and Manual Tuning Guide
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