Sharp AL-1043, Service Manual

Page: 92 / 126

AL-1551 ELECTRICAL SECTION 12-3
2. Circuit descriptions
A. Man PWB (MCU)
(1) CPU signal table
PIN
No.
Signal
code
Input/output Operating
1 /CS1 Output Chip Select for SRAM
2 /CS0 Output Chip Select for EPROM
3 D-GND
4 D-GND
5 5V
6 A0 Output Address Bus (NC-pull up)
7 A1 Output Address Bus
8 A2 Output Address Bus
9 A3 Output Address Bus
10 D-GND
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 D-GND
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 (NC-pull up)
28 D-GND
29 A20 Output Address Bus (NC-pull up)
30 NC-pull up
31 (SPPD) Interruption
level input SPF Paper Pass Detector
32 USB-IN Input USB Connector-In Detect
33 (MHPS) Interruption
level input Mirror Home Position Sensor
34 /CPU
SYNC Interruption
level input Horizontal Synchronous (from G/A)
35 D-GND
36 D-GND
37 ZC Interruption
level input Zero-cross signal
38 /ASICINT Interruption
level input Interrupt from G/A
39 5V
40 D0 Data input/
output Data Bus
41 D1 Data input/
output Data Bus
42 D2 Data input/
output Data Bus
43 D3 Data input/
output Data Bus
44 D-GND
45 D4 Data input/
output Data Bus
46 D5 Data input/
output Data Bus
47 D6 Data input/
output Data Bus
48 D7 Data input/
output Data Bus
49 D8 Data input/
output Data Bus
50 D9 Data input/
output Data Bus
51 D10 Data input/
output Data Bus
52 D11 Data input/
output Data Bus
53 D-GND
54 D12 Data input/
output Data Bus
55 D13 Data input/
output Data Bus
56 D14 Data input/
output Data Bus
57 D15 Data input/
output Data Bus
58 5V
59 (OPDATA) Output Data Signal for Operation Panel
60 FTXD Output TXD for Additional Board
61 FRTS Output RTS for Additional Board
62 FRXD Input RXD for Additional Board
63 (OP-CLK) Output Clock for Operation Panel
64 TMON Output Power Supply Signal for Toner Motor
Driver IC
65 D-GND
66 FCTS Input CTS for Additional Board
67 D-GND
68 D-GND
69 PSW Input Print switch input
70 KIN1 Input Key input 1
71 KIN2 Input Key input 2
72 TMCLK Timer output Clock for Toner Motor
73 /TMEN Output On-Off Control for Toner Motor
74 /POFF Output Power Off Signal for Additional Board
75 PMCLK Timer output Clock for Polygon Motor
76 /PRSTART Output Printing Start Signal
77 /SCANSP Output Scanning Stop Signal
78 /SCANST Output Scanning Start Signal
79 HL Output
(Timer
output) On-Off Control for Heater Lamp
80 WDTOVF- Output Watchdog Timer
81 RES- Input Reset
82 Input pull up
83 Input pull up
84 5V
85 XTAL Clock
86 EXTAL Clock
87 D-GND
88 CPUCLK Output System Clock for G/A
89 5V
90 /AS Output pull up
91 /RD Output Read Signal
92 /HWR Output Write Signal (High Address)
PIN
No.
Signal
code
Input/output Operating
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