Nokia 5140 Manuales De Servicio
NPL-4/5
System Module and User Interface
Nokia Customer Care
Page 70
Copyright © 2004 Nokia Corporation. All rights reserved.
Issue 1 05/04
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Driver will work as constant current generator increase or decrease the output voltage
for LEDs to keep the current stable. Serial resistance 33R is used to create the current
limit with transistor Vbe voltage.
limit with transistor Vbe voltage.
Figure 31: Flashlight Driver and Control
Internal microphone
The internal microphone capsule is mounted into the system connector assy, which is
connected to engine board with springs. Microphone is omni directional and it’s con-
nected to the UEMEK microphone input MIC1P/N. The microphone input is symmetric
and the UEMEK (MICB1) provides bias voltage.
connected to engine board with springs. Microphone is omni directional and it’s con-
nected to the UEMEK microphone input MIC1P/N. The microphone input is symmetric
and the UEMEK (MICB1) provides bias voltage.
Figure 32: Microphone Connection
R=33Ω
VLED
CallLED2
R=47Ω
33nF
UEMEk
MIC1B
MIC1P
2k2
33nF
MIC1N
1k
1000
Ω@100MHz
2k2
2.2uF
1nF
1nF
1k
27pF
27pF
27pF
220