Fig 7 Backlighting - Nokia NSB-7 Series Service Manual

NSB-7
UI Module
switch and two diodes which are needed for MAD interface. Power key is connected to
CCONT. Power switch is active in LOW state. Power key is connected to ROW4.
Backlighting
Switching circuits for backlighting are placed on the UI module. Display and keyboard
lighting are connected together. When LIGHT-signal is HIGH the lights are on and when
LIGHT-signal is LOW state lights are off.
Backlighting is made by LED's, three LED's on the right and three on the left side of the
display. LED's are compatible with CL270-YG and those are side illuminating. Light is on
when LIGHT-signal is in the HIGH state.
The keyboard backlighting is made by 6 LED's.. The LED's are compatible with CL190-YG.
Backlighting is on when LIGHT-signal is on HIGH state.
Page 14
Figure 7: Backlighting
ãNokia Mobile Phones Ltd.
PAMS Technical Documentation
Issue 1 06/00