Keyboard - Nokia RM-42 Service Manual

Nokia Customer Care
Sub-display features:
• Display is Series 40 display with format of 128 x 128 pixels.
• Maximum number of colors is 65 536 (16 bits).
• Backlight unit is provided, so the transflective display can be used both in reflective mode and in transmissive
mode.
• 9-bit serial interface is used between the display module and the engine HW to transfer display data. LoSSI
interface is used to transfer display commands.
• S40 command functions (Display controlling functions and power controlling functions) are available.
• LCD display driver IC is mounted on the display glass panel. Other external components (Power IC, EEPROM
and passive components) on the display module are located on the FPWB of the display module
The module includes:
• FPC foil including connector and required passive/active components.
• Display panel (glass) with COG driver including display controller and 132 x132 x16 bit RAM
• Illumination system: backlight module, which includes lightguide with white casing, optical sheets and 3
white LEDs.
• Plastic holder frame
The interconnection between the LCD module and display flex is implemented with 12-pin board-to-board
connector.
The display module is equipped with bi-directional 9-bit serial interface
Jordan display is controlled via LoSSi interface by Helen3. All LoSSi signals go through the EMC filtering ASIPs to
Jordan display.
Display modules do not require any tunings in service.

Keyboard

The device keyboard is connected to the main PWB with a board-to-board connector.
The keymatrix has seven rows and five columns. The SW application keys on the Fold PWB and the capture key
are connected to the same keymatrix. Joystick is connected to GPIOs of OMAP.
Page 9–22
Figure 109 General diagram of the sub-display module
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RM-42
System Module
9241872 (Issue 1)