AR-5012 ELECTRICAL SECTION 13 - 3
2. Circuit descriptions
A. Main PWB (MCU)
(1) General
The MCU PWB is composed of:
• CPU peripheral sections which perform mechanical sequence
control and function job management
• Image process ASIC which performs image process, CCD control,
LSU control, and print control
• Motor control circuit
• Mechanical load, sensor I/O circuit
It controls the processes for copying, the transport loads, fusing, the
optical system, the operation panel, and the option PWB.
(2) CPU signal table (HD6412320F)
PIN
No.
Signal code
Input/
Output
Operating
1
/CS1
Output
SRAM chip select
2
/CS0
Output
Flash ROM chip select
3
GND
DGND
4
GND
DGND
5
Vcc
CPU3.3V
6
A0
Output
Address bus
7
A1
Output
Address bus
8
A2
Output
Address bus
9
A3
Output
Address bus
10
GND
DGND
11
A4
Output
Address bus
12
A5
Output
Address bus
13
A6
Output
Address bus
14
A7
Output
Address bus
15
A8
Output
Address bus
16
A9
Output
Address bus
17
A10
Output
Address bus
18
A11
Output
Address bus
19
GND
DGND
20
A12
Output
Address bus
21
A13
Output
Address bus
22
A14
Output
Address bus
23
A15
Output
Address bus
24
A16
Output
Address bus
25
A17
Output
Address bus
26
A18
Output
Address bus
27
A19
Output
Address bus
28
GND
DGND
29
A20
Pull-Up
30
PSW
Interruption
level input
Print SW
31
SPPD
Interruption
level input
SPF paper sensor
32
CCD_TG
Interruption
level input
CCD horizontal sync signal
33
Mt_at_home
Interruption
level input
Mirror Home Position
34
/CPUSYNC
Interruption
level input
Horizontal sync (ASIC)
35
GND
DGND
36
GND
DGND
37
FW
Interruption
level input
Zero cross signal
38
ARB_INT
Interruption
level input
ASIC interruption
39
Vcc
CPU3.3V
40
D0
Data I/O
Data bus
41
D1
Data I/O
Data bus
42
D2
Data I/O
Data bus
43
D3
Data I/O
Data bus
44
GND
DGND
45
D4
Data I/O
Data bus
46
D5
Data I/O
Data bus
47
D6
Data I/O
Data bus
48
D7
Data I/O
Data bus
49
D8
Data I/O
Data bus
50
D9
Data I/O
Data bus
51
D10
Data I/O
Data bus
52
D11
Data I/O
Data bus
53
GND
DGND
54
D12
Data I/O
Data bus
55
D13
Data I/O
Data bus
56
D14
Data I/O
Data bus
57
D15
Data I/O
Data bus
58
Vcc
CPU3.3V
59
ONL
Output
Online LED control
60
TxD1
Output
For debug
61
D_CONT
Output
USB Pull-Up control
62
BEO
Output
OPE LED control
63
RESETOUT1
Output
ASIC Reset signal
64
CL_Reset
Output
Copy lamp control
65
GND
DGND
66
/DREQ0
Pull-Up
67
GND
DGND
68
GND
DGND
69
RY/BY
Input
Flash Busy signal
70
KIN1
Input
HC151 selector detection
71
KIN2
Input
HC151 selector detection
72
TMCLK
Output
Toner motor lock
73
TMEN
Output
Toner motor enable
74
POFF
Output
Shut off control
75
PMCLK
Output
Polygon clock
76
DMT0
Output
Duplex Motor signal
77
DMT1
Output
Duplex Motor signal
78
DMT2
Output
Duplex Motor signal
79
DMT3
Output
Duplex Motor signal
80
WDTOVF
Output
NC Pull-Up
81
/RES
Input
Reset
82
NMI
Output
NC Pull-Up
83
STBY
Output
NC Pull-Up
84
Vcc
CPU3.3V
85
XTAL
Input
Clock
86
EXTAL
Output
Clock
87
GND
DGND
88
CPUCLK
Output
NC
89
Vcc
CPU3.3V
90
Reset OUT
NC
91
/RD
Output
Read signal
92
/HWR
Output
Write signal (High address)
93
/LWR
Output
Write signal (Low address)
94
SELIN3
Output
HC151 select signal
95
SELIN2
Output
HC151 select signal
96
SELIN1
Output
HC151 select signal
97
FAXSTS
NC
98
FAXCMD
NC
99
GND
DGND
100
GND
DGND
101
SCL
Output
EEPROM clock
102
DSDA
Data I/O
EEPROM Data bus
103
AVcc
CPU3.3V
104
Vref
CPU3.3V
105
RTH
Analog
input
Fusing thermistor
106
Analog
input
NC Pull-Up
107
SIN1
Input
HC151 select detection
108
SIN2
Input
HC151 select detection
109
SIN3
Input
HC151 select detection
PIN
No.
Signal code
Input/
Output
Operating
