Alert/Headset/Back Light Control - Motorola StarTAC 3000 Service Manual

StarTAC 3000:
A
BK LT
LED'S
B
BKLT CNTRL
U700-17
page B-18
LOG_2.75
C741
page B-18
P800
HEADSET MIC
37
J600-2
HEADSET DETECT
U800-79
page B-19
P800
HEADSET_EN
U601-4
19
page B-11
P800
AUDIO_CNT
U601-9
40
page B-11
Alert/Headset/
Back Light Control
R922
R921
G
Q680
C
Q740
D
E
F
C765
R767
R681
Backlight Backlight
OFF ON
Q681
2.69V 1.96V
A
0V 2.57V
B
0V .69V
G
VOLTAGE SUPPLIES
Colored boxes represent the area in
which the components are placed.
G
R761
C763
U760
G
H
I
Q760
I
H
ALERT_EN
ALERT_OUT
RING_OUT
MIC_BIAS
No
Headset Headset
C
2V
0V
D
0V
2.75V
E
0V 2.75V
F 2V
0V
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distribution strictly prohibited without prior written
consent from Motorola and must be returned upon
Motorola's request.
Motorola Confidential Proprietary
B+
Alert Alert
OFF ON
0V 2.1V
0V 2.7V
0V
4.1V
P800
28
U520-14
page B-9
54 ALERT
C761
page B-18
U700-37
page B-18