ViewSonic N4285p-4M Service Manual page 81

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