Acer SPECTRUM AL801 Service Manual page 40

MCU Block
HDATA0
MFB7
MFB8
MFB9
HCLK
HFS
BKLT-PWM
VOL
C316 R302
10 K
22 uF
GND
RXD
TXD
IRQ
MFB2
SDA
+5V
SCL
RST1
/VGA_CON
C313 D301
22 uF 1N4148
RST
C303
R313
33 pF
10 K
GND
GND
+A5V
R300 R301 U300
10 K 10 K 8
VCC
C300
SDA 5
SI
0.1 uF
7
WP
1
A0
SCL
6 2
SCK A1
3
A2
4
VSS
24LC04B
GND
8XC51/PLCC
U302
2
T2/P1.0 P2.0/A8
3
T2EX/P1.1 P2.1/A9
4
P1.2 P2.2/A10
5
P1.3 P2.3/A11
6
P1.4 P2.4/A12
7
P1.5 P2.5/A13
8
P1.6 P2.6/A14
9
P1.7 P2.7/A15
RST 10
RST PSEN
ALE/PROG
11
RXD/P3.0
13
TXD/P3.1 P0.7/AD7
14
INT0/P3.2 P0.6/AD6
15
INT1/P3.3 P0.5/AD5
16
TO/P3.4 P0.4/AD4
17
T1/P3.5 P0.3/AD3
18
WR/P3.6 P0.2/AD2
19
RD/P3.7 P0.1/AD1
P0.0/AD0
R340
20
XTAL2
VCC
X300 R341 0
EA/VP
21
XTAL1
TEST(OP)
20MHz
C306
33 pF
+5V
R333
PS3
2 K
JP303
R
JP302 R315 MMBT3904
/BKLT-ON
R(OP)
10 K
GND
+5V
R431
10 K(OP)
(Panel-Select)*
24 PS3
25
26
27
PW5V-ON
28
29 /BKLT-ON R321 R323
30
31 0 (OP) 0 (OP)
32
33
GND
36
37 KEY1(ORANGE?)
KEY2(GREEN?)
38 RP301
39 8 1
40 7 2
41 6 3
42 5 4
43
4.7K Ohm
+A5V
44 R303
35 +5V 4.7K
C305 C304
100uF 0.1 uF
+12V
+5V C403
C944 100uF
R311 0.1 uF
CN303
10 K
1
GND
2
3
4
5
1 Q304
+5V HEADER 5
GND
GND R401
VR501 W BKLT ADJ
10 K
0(OP) C401
100uF(OP)
GND
GND
3
R238 0(OP)
R319
K/E Select
R237 0(OP)
1
1
2
KEY
2
R236 10 K(OP)
R325
GND +5V
0 (OP)
R328 R329
10 K 10 K
CN302
1
2
3
4
5
6
7
8
9
HEADER 9
CP301 CP302
1000 pF 1000 pF
GND
GND
VOL
MUTE
STDBY
+5V
R403
4.7K(OP)
R402
BKLT-PWM
1K(OP)
ACER Electronics Co., Ltd.
Title
MICRO CONTROLLER
Size Document Number
B
Date: Monday, October 21, 2002
+5V +5V
R239 R235
4.7K(OP) 4.7K(OP)
MUTE
STDBY
Q201
1
MMBT3904(OP)
GND
GND
C951
CAP(OP)
+5V
MUTE
C954 1000PF(OP)
STDBY
C955 1000P(OP)
GND
+12V
+12V
CN304
1
2
C953
3
4 CAP(OP)
5
6
GND
HEADER 6
Rev
715L820-2-2 A
3 6
Sheet of