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ii.
Switching power ON
When Switching power receives the start order by 2
Then by Q25 2N7002 (signal mark V12_ON) and 1
provides +12V (POWER STREE, refer to page 20 of schematic) and +24V , turn on the circuit of
+5V(signal mark VCC).
J11
V12_ON
1
2
3
4
0_NC
5
6
7
8
9
10
11
12
13
To Switching Power
iii.
VCC ON/OFF
+5V (signal mark VCC) turn on when V12_ON=Hi, Every batches of digital board circuit would be
able to process Power ON procedure.
+5V Always ON
V12_ON
iv.
CPU RESET
U18 PW328 CPU will output a Hi level to trigger other IC to reset when +5V, +12V and +24V start to
work. Then Firmware starts to read the data of U33 via U29 PWM2030 CPU and transmits data via
I2C BUS and sends control signal to run the TURN ON
ViewSonic Corporation
All manuals and user guides at all-guides.com
Hi=POWER ON
V12IN
R318
C488
2N7002
10U
0
R319
Vsub
VCC ON/OFF
Vsub
L123
PBY32-190
R340
10K
Q24
3904
B
R343
10K
8
nd
pin of U41 (signal mark POWERON),
st
pin of J11 to control Switching Power Model
V5up
R298
5.6K
Q15
G
2.2K
R300
C482
.1
Lo=POWER ON
Q23
AP4435M
1
S1
D1
2
S1
D1
3
S1
D1
4
G1
D1
C510
To every batches of
470U
digital board circuit
procedure.
Confidential - Do Not Copy
V5up
U41
SM5964C40J
43
P0.0/AD0
P2.0/A8
42
P0.1/AD1
P2.1/A9
41
P0.2/AD2
P2.2/A10
40
P0.3/AD3
P2.3/A11
39
P0.4/AD4
P2.4/A12
38
P0.5/AD5
P2.5/A13
37
P0.6/AD6
P2.6/A14
36
P0.7/AD7
P2.7/A15
PWRON
2
P1.0
P3.0/RXD
3
P1.1
P3.1/TXD
4
P1.2
P3.2/INT0
5
P1.3
P3.3/INT1
6
P1.4
P3.4/T0
7
P1.5
P3.5/T1
8
P1.6
P3.6/WR
9
P1.7
P3.7/RD
21
XTAL1
ALE/PROG
20
XTAL2
PSEN
35
EA/VPP
10
RST
VCC
8
7
6
5
N4261w-1M
24
25
26
27
28
29
30
31
11
13
14
15
16
17
18
19
33
32
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