Nokia RM-627 Service Manual
Also see for RM-627: Service manual
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The following block diagram shows the keyboard interface.The keyboard interface is implemented with RAPU’s GENIOs.The LEDs at the keyboard are controlled by a LED driver. The driver is controlled by a PWM signal from EM ASICGazoo.Figure 38 Keyboard interfaceAmbient light sensor (ALS) interfaceAmbient light sensor information is used to control keyboard and display brightness.• Keyboard backlight is turned OFF, when it is not needed.• Display brightness is dimmed, when environment lighting is dark.The ambient light sensor is calibrated in production and can be re-tuned in service points, though notrecommended unless calibration coefficient is lost for some reasonFigure 39 Ambient light sensor (ALS) interfaceAudio interfaceThe following block diagram illustrates the audio interface of the phone:RM-627System ModulePage 5 – 14 COMPANY CONFIDENTIAL Issue 1Copyright © 2010 Nokia. All rights reserved. |
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