Test Procedure - Nokia RM-598 Service Manual

Internal handsfree output is measured using a current probe, if a special low-pass filter designed for
measuring a digital amplifier is not available. Note also that when using a current probe, the input signal
frequency must be set to 2kHz.
The input signal for each loop test can be either single-ended or differential.
Required equipment
The following equipment is needed for the tests:
• Oscilloscope
• Function generator (sine waveform)
• 'Active speaker' or 'speaker and power amplifier'
• Sound level meter
• Current probe
• 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
External Mic to
External Earpiece
External Mic to
Internal Earpiece
External Mic to
Internal
handsfree
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Input Output
terminal terminal
XMICP and HSEAR R
GND and GND
HSEAR L
and GND
XMICP and EarP and
GND GND
EarN and
GND
XMICP and E2121 and
GND E2123 pads
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BB Troubleshooting and Manual Tuning Guide
Path Input
gain [dB] voltage
[mVpp]
16.7 100
10.9 100
28.1 100
RM-598; RM-604
Output Output
voltage DC level
[mVpp] [V]
680 1.2
353 1.2
2540 0
Output
current
[mA]
NA
NA
112mA
(calc.)
Issue 1