ViewSonic N4285p-4M, Service Manual

Page: 81 / 109

8 . 18 . RS232
pin1 To mainboard P104 +5VSB
pin2 To U0RX
pin3 To U0TX
pin4 To GND
pin5 To Power key
pin6 To +5V
MCU 5V LA01
MCU 3.3V LA02
MAX232DR LA03(5V)
ADM3202 LA04(3.3V)
pin2,pin3 change 2008-09-08
MC1P
MC1M
MC2P
MC2M
MRXD
MVM
MVP
RRXD U0RX
XTAL2
XTAL1
RESET
U0RX
U0TX
VCC_Det
U0TX
U0RX
U0TX
PWR_CTRL
VCC_Detect
PWR_CTRL
VCC_Detect
MTXD
VDD_MCU
VDD_MCU
VDD_RS232
VDD_MCU
+5VSB
VDD_MCU
+5VSB 3V3SB
+5VSB 3V3SB
VDD_MCU
VDD_RS232
RA09
0
RA02
4.7K
RA12
10K
LA02
NC/FB/200R/2A
PA01
B6B-PH
1
2
3
4
5
6
1
2
3
4
5
6
+
CA01
NC
IA01
8051+64FlashROM/PLCC44
35
21
20
10
14
15
16
17
2
3
4
5
6
7
8
9
43
42
41
40
39
38
37
36
24
25
26
27
28
29
30
31
19
18
32
33
13
11
44
22
1 12
23 34
EA/VP
X1
X2
RESET
P3.2/INT0
P3.3/INT1
P3.4/T0
P3.5/T1
P1.0/T2
T1.1/T2EX
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
P2.0
P2.1
P2.2
P2.3
P2.4
P2.5
P2.6
P2.7
P3.7/RD
P3.6/WR
PSEN
ALE/P
P3.1/TXD
P3.0/RXD
VCC
VSS
P4.2 P4.3
P4.0 P4.1
CA04
20pF
IA02
MAX232DR/ADM3202
15
16 1
2 3
4
5 6
7
8 9
10
11
12 13
14
GND
VCC C1P
VP C1M
C2P
C2M
VM
TOUT2
RIN2 ROUT2
TIN2
TIN1
ROUT1 RIN1
T1OUT
RA01
1M
RA10 220
LA04
FB/200R/2A
CA02
20pF
+
CA03
1uF/50V
Q101
2N3904
1
2
3
RA13
10K
CA08 0.1uF
RA08
NC
LA03
NC/FB/200R/2A
CA05
0.1uF
IA03
AIC1117APY
1
2 3
4
ADJ/GND
OUT IN
Tab
RA05 0
LA01
FB/200R/2A
CA06
0.1uF
CA07
0.1uF
+
CA12
10uF/50V
RA11
470
RA06 0
XA01
11.0592MHz
RA07 220
RA14
110/1%
RA04
100K
RA15
182/1%
RA03
10K
PA02
DB9_V
5
9
4
8
3
7
2
6
1
10
11
CA09 0.1uF
+
CA10
10uF/50V
CA11
0.1uF
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Confidential - Do Not Copy
N4285p-4M
78