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2. Circuit descriptions
A. Main PWB (MCU)
(1) General
The MCU PWB is composed of:
• CPU peripheral section which performs mechanical sequence
control, U/I, and each function job management.
The CPU connects with the ASIC and memory by use of the system
bus and performs jog management and sequence control of the
whole engine.
• Image process ASIC which performs image process, CCD control,
LSU control, and print control.
• OA982 peripheral section which performs E-Sort and FAX control.
The OA982 performs image data input/output with the ASIC,
SDRAM memory management, and communication with USB2.0
devices.
• I/F section for USB2.0 and IEEE1284 control. (For the AL series,
IEEE1284 is not available.)
• Motor control circuit
• Mechanical load, sensor I/O circuit
It performs control and management of the process, the transport
loads, the fusing, the optical, and the operation panel sections for exe-
cuting a series of copy/print/scan operations.
(2) CPU signal table (H8S/2321)
PIN
Signal code
No.
Output
1
/CS1
Output
2
/CS0
Output
3
GND
4
GND
5
Vcc
6
A0
Output
7
A1
Output
8
A2
Output
9
A3
Output
10
GND
11
A4
Output
12
A5
Output
13
A6
Output
14
A7
Output
15
A8
Output
16
A9
Output
17
A10
Output
18
A11
Output
19
GND
20
A12
Output
21
A13
Output
22
A14
Output
23
A15
Output
24
A16
Output
25
A17
Output
26
A18
Output
27
A19
Output
28
GND
29
A20
30
PSW
Interruption
level input
31
SPPD
Interruption
level input
32
CCD_TG
Interruption
level input
33
MHPS
Interruption
level input
34
/CPUSYNC
Interruption
level input
35
GND
36
GND
37
FW
Interruption
level input
Input/
Operating
SRAM chip select
Flash ROM chip select
DGND
DGND
CPU3.3V
Address bus
Address bus
Address bus
Address bus
DGND
Address bus
Address bus
Address bus
Address bus
Address bus
Address bus
Address bus
Address bus
DGND
Address bus
Address bus
Address bus
Address bus
Address bus
Address bus
Address bus
Address bus
DGND
Pull-Up
Print SW
SPF paper sensor
CCD horizontal sync signal
Mirror Home Position
Horizontal sync (ASIC)
DGND
DGND
Zero cross signal
AR-168N/168L ELECTRICAL SECTION 13 - 2
PIN
Input/
Signal code
No.
Output
38
ARB_INT
Interruption
level input
39
Vcc
40
D0
Data I/O
41
D1
Data I/O
42
D2
Data I/O
43
D3
Data I/O
44
GND
45
D4
Data I/O
46
D5
Data I/O
47
D6
Data I/O
48
D7
Data I/O
49
D8
Data I/O
50
D9
Data I/O
51
D10
Data I/O
52
D11
Data I/O
53
GND
54
D12
Data I/O
55
D13
Data I/O
56
D14
Data I/O
57
D15
Data I/O
58
Vcc
59
POFF
Output
60
TxD1
Output
61
SDA
Output
62
SCL
Output
63
LCDRS
Output
64
LCDE
Output
65
GND
66
CS4 (FAX)
67
GND
68
GND
69
RY/BY
Input
70
LCDDB4
Output
71
LCDDB5
Output
72
BZR
Output
73
LCDDB7
Output
74
LCDDB6
Output
75
Reset OUT1
Output
76
DMT0
Output
77
DMT1
Output
78
DMT2
Output
79
DMT3
Output
80
WDTOVF
Output
81
/RES
Input
82
NMI
Output
83
STBY
Output
84
Vcc
85
XTAL
Input
86
EXTAL
Output
87
GND
88
CPUCLK
Output
89
Vcc
90
PRINTST
Output
91
/RD
Output
92
/HWR
Output
93
/LWR
Output
94
SELIN3
Output
95
SELIN2
Output
96
SELIN1
Output
97
ESSTS
Output
98
ESCMD
Input
99
GND
100
GND
101
ESSRDY
Input
102
ESCRDY
Output
103
AVcc
104
Vref
105
RTH
Analog
input
Operating
ASIC interruption
CPU3.3V
Data bus
Data bus
Data bus
Data bus
DGND
Data bus
Data bus
Data bus
Data bus
Data bus
Data bus
Data bus
Data bus
DGND
Data bus
Data bus
Data bus
Data bus
CPU3.3V
Shut off control
For debug
EEPROM Data bus
EEPROM clock
LCD control
LCD control
DGND
Chip select (FAX)
DGND
DGND
Flash Busy signal
LCD control
LCD control
Buzzer signal
LCD control
LCD control
Reset signal
Duplex Motor signal
Duplex Motor signal
Duplex Motor signal
Duplex Motor signal
NC Pull-Up
Reset
NC Pull-Up
NC Pull-Up
CPU3.3V
Clock
Clock
DGND
NC
CPU3.3V
Print start signal
Read signal
Write signal (High address)
Write signal (Low address)
HC151 select signal
HC151 select signal
HC151 select signal
E-sort control
E-sort control
DGND
DGND
E-sort control
E-sort control
CPU3.3V
CPU3.3V
Fusing thermistor
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