LM721A
Service Manual Rev: A
Page
Page
Page
Page 26
26
26
26 of
of
of
of 59
59
59
59
6.3 Key Board
MUTE
C407
NC
GND
REDLED
PWM0
P.4
FB402
60
GND
GPIO6
P.4
CN402
CON402I(PITCH 2.0)
1
3
5
7
9
11
2
4
6
8
10
12
+A3.3V
KEY LEFT
KEYON_OFF
+
C412
150uF/25V
LED_ORANGE
P.4
+
C410
150uF/25V
C439
150pF
GND
+5V
U106C
74LVC14
5
6
14
7
CONNECTOR for
POWER/INVERTER
Board
gm5120
A
K.B AND CONNECTOR
AOC
B
5
5
Monday, August 19, 2002
Title
Size
Document Number
Rev
Date:
Sheet
of
LED_GRN
P.4
R420
NC
SP(R)
C413
1uF/16V
GPIO2
P.4
KEY_RIGHT
STDBY
C418
0.1uF/16V
Q405
NC
VOL
SP(L)
+
C416
22uF/16V
C405
0.1uF/16V
+12V
PBIAS
P.4
6/24 ADD FB -FB401-404& C
RP401
4.7K£[ 1/16W
1
2
3
4
8
7
6
5
+3.3V
GND
FB401
60
OUT(R)
GPIO3
P.4
R412
4.7K£[ 1/16W
5/10 change A+3.3V
GRNLED
KEY_AUTO
+2.5V
GND
C415
1uF/16V
BackLight On/Off
MUTE
RP402
10K£[ 1/16W
1
2
3
4
8
7
6
5
C423
150pF
KEY ENTER
STDBY
+5V
GPIO7
P.4
+
C414
150uF/25V
+
C404
150uF/25V
C411
1uF/16V
GND
GND
VOL
OUT(R)
GND
GND
KEY_RIGHT
+5V
C440
150pF
GPIO8
P.4
R419
NC
CN403
CON403(PITCH 2.0)
1
3
5
7
9
11
13
2
4
6
8
10
12
14
GND
+5V
OUT(L)
P.5
Earphone(R)
Earphone(R)
R402
0
GND
+A5V
R418
NC
R401
0
+
C408
150uF/25V
VR401
Brightness
+
C406
NC
GND
FB404
60
+3.3V
KEY ENTER
+2.5V
PWM0
U106D
74LVC14
9
8
14
7
+
C401
150uF/25V
+12V
C409
0.1uF/16V
+A3.3V
SP(R)
VOL
CONNECTOR for
KEYBOARD
Earphone(L)
STDBY
+A5V
GND
GND
R415
1K£[ 1/16W
+A2.5V
GND
MUTE
KEY LEFT
SP(L)
GND
R403
10K£[ 1/16W
+5V
GND
CN401
CON12A(PITCH 2.0)
1
3
5
7
9
2
4
6
8
10
11
12
Earphone(L)
Q406
NC
+12V
OUT(L)
C403
0.1uF/16V
GND
GPIO10
P.4
GND
KEY_AUTO
ADD GPIO10 4/29
R405
4.7K£[ 1/16W
FB403
60
+A3.3V
R404
4.7K£[ 1/16W
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