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RM-583
Baseband Description and Troubleshooting
Battery
RM-583 uses a Lithium-Ion cell battery with a capacity of 860mA. QSC reads the resistor inside the
battery pack on the BSI line to identify the battery size. Different charging algorithm will be used for
different battery sizes. The resistors are connected to the BSI pin inside the battery connector.
BSI= 75Kohm
Display and keypad
RM-583 uses light-emitting diodes (LEDs) for liquid crystal display (LCD) and keypad illumination. There
are four white LEDs for LCD and two LEDs for the keypad. KPD_DRV_N is the signal used to drive
keypad LEDs.
LCD_DRV_N is the signal used to drive LCD LEDs. RM-583 uses a color LCD. The interface uses a
parallel bus to transfer the Command/ Data between QSC and LCD.
Troubleshooting
Firstly, carry out a thorough visual check of the module. Make sure in particular that:
1. There is no mechanical damage.
Issue 1
COMPANY CONFIDENTIAL
Copyright © 2009 Nokia. All rights reserved.
Page 6-11
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