Nokia RM-272 Service Manual
Also see for 3500 classic RM-272: Service manual
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Contents
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μSD card interfaceThe μSD card is connected to the engine by an external level shifter and ESD protection filter. Suppliedvoltages:• VMMC: 2.85 V (from level shifter)• VIO: 1.8 V (from Retu)The card removal is detected by a push detect switch.User interfaceDisplayThe display unit comprises a parallel interface.KeyboardAll keys are placed on the main PWB.• Numeric keys• Navigation key, Soft keys, Start, and End• Power switch• Volume up and down switchDisplay and keypad backlightThere are two sets of LEDs illuminating the display and the keypads:• Display LEDs, 4pcs• Main keypad on PWB, 4 pcs, white colourAll sets share the same driver. None of the keypads can be illuminated without the LCD backlight being turnedon.Audio conceptAudio conceptThe functional core of the audio hardware is built around two ASICs; RAP engine and Retu.Retu provides an interface for the trancducers and the AV connector.There are three audio transducers:• 1 dynamic earpieceRM-272; RM-273System moduleIssue 1 COMPANY CONFIDENTIAL Page 5 –13Copyright © 2007 Nokia. All rights reserved. |
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