Alphamon technical description and troubleshooting
Proximity sensor and ambient light sensor (ALS)
This phone uses a combined proximity and ambient light sensor called Alphamon. The proximity sensor is
integrated to the module and uses an internal LED supplied by VBAT. The current this LED consumes is
controlled by Alphamon and set using software. The interrupt output of Alphamon changes state when the
infra red light from the LED is reflected back by a suitable reflective surface. The ambient light sensor detects
the level of ambient light and adjusts the display brightness accordingly whenever the display is active.
Covering this sensor results in dimmed display lights.
Use service software to verify that it works. Use a finger to hide the Alphamon sensor window, the light
intensity in mLux changes from 0 to approx. 130 000.
Note: The light intensity could vary depending on how the finger hides the Alphamon window.
Proximity and ALS sensor calibration
Use Service SW to calibrate the proximity and ALS sensors after A-cover assembly change.
RM-824; RM-825; RM-826
BB Troubleshooting Guide
Page 3 – 30 NOKIA INTERNAL USE ONLY Issue 2
Copyright © 2012 Nokia. All rights reserved.
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