User Guide

RH-37
System Module Nokia Customer Care
Page 34 Nokia Corporation Issue 1 07/04
Figure 14: Illumination
Test possibility
Phoenix LED test
For troubleshooting see Display faults in Baseband Troubleshooting Instructions.
XPress on grip LEDs
RH-37 uses 10 different controllable LEDs for light effects. For each LED one transistor
serves as switch and current limiter. 33 resistors limit the current to an appropriate
value. PWM modulation is realized by KLIGHT and KLIGHT2 output of UEMEK. 8 GENIOs
are used to control the LEDs.
Figure 15: XPress on grip LED driver. There are 8 identical drivers.
Test possibility
Phoenix LED test.
V
BAT
DC/DC-Converter
EN
V
LED+
V
LED-
V
in
GEN I/O 19
LCD Backli
g
ht
DLIGHT
Ke
y
bord li
g
ht
UEME
X
Press on grip LED
V
BAT
GEN I/O
KLIGHT
UEME