Canon MultiPASS C755 Service Manual - Page 136

Circuit Board Components, a System control a-1 MPU Micro Processor Unit IC 101 - printer software

Get Canon MultiPASS C755 PDF manuals and user guides View all Canon MultiPASS C755 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 136 highlights

MultiPASS C755 Chapter 3: Maintenance & Service 10.2 Circuit Board Components a) System control section The system controller is made up of the following components, and controls the entire fax system. This section drive +3.3V voltage from power supply unit. a-1) MPU (Micro Processor Unit) (IC 101) The main functions of the NEC µPD703102GJ-A33-022-8EU(V850) MPU are as follows. • 32 bit CPU • 24 bit address bus • 16 bit data bus • DMA control • A/D converter • Serial interface • Software CODEC (MH, MR, MMR, JBIG) • Color FAX function (Lab color conversion, JPEG encode/decode) • Interrupt control unit • Built-in 4K Byte RAM for working area • Built-in 128K Byte Mask-ROM for programable area a-2) System controller (IC 301) The system controller is a gate array for controlling MPU peripheral devices. This IC drive +5V and +3.3V voltage. The main functions of the system controller are as follows: • Printer resolution conversion (Ultra-smoothing) This IC converts facsimile data of horizontal resolution of 8 dots/mm and vertical resolution of 3.85 or 7.7 lines/mm to print data of 360 dpi and 360 dpi, respectively. • BJ printer interface (IEEE 1284) 8 bit parallel print data sent to the Printer controller. • OPCNT serial interface (Contains document sensor and document edge sensor signals) • DRAM/SRAM controller Controls DRAM/SRAM read/write and renewal. • Serial-to-parallel conversion • Horizontal scaling • Detection of document edge sensor and ink detection sensor a-3) RTC (Real Time Clock) IC (IC 502) S-3510ANFJA is used as the RTC. The RTC IC is backed up by lithium battery, and counts the date and time. 3-85

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
3-85
MultiPASS C755
Chapter 3: Maintenance & Service
10.2 Circuit Board Components
a) System control section
The system controller is made up of the following components, and controls the entire fax system.
This
section drive +3.3V voltage from power supply unit.
a-1) MPU (Micro Processor Unit) (IC 101)
The main functions of the NEC μPD703102GJ-A33-022-8EU(V850) MPU are as follows.
•
32 bit CPU
•
24 bit address bus
•
16 bit data bus
•
DMA control
•
A/D converter
•
Serial interface
•
Software CODEC (MH, MR, MMR, JBIG)
•
Color FAX function (Lab color conversion, JPEG encode/decode)
•
Interrupt control unit
•
Built-in 4K Byte RAM for working area
•
Built-in 128K Byte Mask-ROM for programable area
a-2) System controller (IC 301)
The system controller is a gate array for controlling MPU peripheral devices.
This IC drive +5V and
+3.3V voltage.
The main functions of the system controller are as follows:
•
Printer resolution conversion (Ultra-smoothing)
This IC converts facsimile data of horizontal resolution of 8 dots/mm and vertical resolution of 3.85 or
7.7 lines/mm to print data of 360 dpi and 360 dpi, respectively.
•
BJ printer interface (IEEE 1284)
8 bit parallel print data sent to the Printer controller.
•
OPCNT serial interface (Contains document sensor and document edge sensor signals)
•
DRAM/SRAM controller
Controls DRAM/SRAM read/write and renewal.
•
Serial-to-parallel conversion
•
Horizontal scaling
•
Detection of document edge sensor and ink detection sensor
a-3) RTC (Real Time Clock) IC (IC 502)
S-3510ANFJA is used as the RTC.
The RTC IC is backed up by lithium battery, and counts the date
and time.