Circuit Descriptions - Sharp AL-1215 Service Manual

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 Input/
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 Mt_at_home Interruption
level input
34 /CPUSYNC Interruption
level input
35 GND
36 GND
37 FW Interruption
level input
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
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
ASIC interruption
CPU3.3V
Data bus
Data bus
Data bus
Data bus
DGND
AL-1551CS ELECTRICAL SECTION 12 - 3
PIN Input/
Signal code
No. Output
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 ONL Output
60 TxD1 Output
61 D_CONT Output
62 BEO Output
63 RESETOUT1 Output
64 CL_Reset Output
65 GND
66 /DREQ0
67 GND
68 GND
69 RY/BY Input
70 KIN1 Input
71 KIN2 Input
72 TMCLK Output
73 TMEN Output
74 POFF Output
75 PMCLK 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 Reset OUT
91 /RD Output
92 /HWR Output
93 /LWR Output
94 SELIN3 Output
95 SELIN2 Output
96 SELIN1 Output
97 FAXSTS
98 FAXCMD
99 GND
100 GND
101 SCL Output
102 DSDA Data I/O
103 AVcc
104 Vref
105 RTH Analog
input
106 Analog
input
107 SIN1 Input
108 SIN2 Input
109 SIN3 Input
Operating
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
Online LED control
For debug
USB Pull-Up control
OPE LED control
ASIC Reset signal
Copy lamp control
DGND
Pull-Up
DGND
DGND
Flash Busy signal
HC151 selector detection
HC151 selector detection
Toner motor lock
Toner motor enable
Shut off control
Polygon clock
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
NC
Read signal
Write signal (High address)
Write signal (Low address)
HC151 select signal
HC151 select signal
HC151 select signal
NC
NC
DGND
DGND
EEPROM clock
EEPROM Data bus
CPU3.3V
CPU3.3V
Fusing thermistor
NC Pull-Up
HC151 select detection
HC151 select detection
HC151 select detection