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Trouble Shooting Guide, Advanced
No further action should be taken for a liquid damaged telephone.
Make sure the earphone connection (J900) pogo pins is correctly mounted, undamaged and not
dirty.
Give the board power and start it in the test program.
Go to Audio / Audio Fig. 21.2.
Start ATMS – Earphone:
It is needed to set the Speaker/ Mic gain in the Gain control for each measurement, adjustable
between 00 to 3C.
You activate the "Speaker mode" by holding a magnet close to the Hall element N600.
Make sure there is VANA at N901 pin 1,2,3,18 and that I2CDAT and I2CCLK is ok.
Make sure there is SWDC at N900 pin 1,6.
Use schematics and follow the signal to establish where there is a loss.
21.10 The Microphone amplifier is out of order
When there is a microphone amplifier fault is it only the audio paths "Mic – AFMS" and
"Mic – CPU – Earphone" that is faulty.
The other three audio paths should be working.
The trouble shooting below assumes the microphone of the phone has been replaced, and the
microphone part is working, but the fault remains, so then the fault is at the microphone
amplifier.
Open the phone and check for liquid damages.
No further action should be taken for a liquid damaged telephone.
Give the board power and start it in the test program.
Go to Audio / Audio Fig. 21.2.
Start Mic – AFMS:
It is needed to set the Speaker/ Mic gain in the Gain control for each measurement, adjustable
between 00 to 3C.
You activate the "Microphone amplifier" by holding a magnet close to the Hall element N600.
Make sure there is VANA at N901 pin 1,2,3,18 and that I2CDAT and I2CCLK is ok.
Make sure there is VDIG at V802, and the signal MICGAIN.
Use schematics and follow the signal to establish where there is a loss.
4/00021-3/FEA 209 544/18 B
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