Confidential
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3.3.3 Main PCB (Video Controller PCB)
[ 1 ] Outline
The main PCB consists of the circuits which perform the following functions;
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Receive the printing data from the computer.
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Convert the received data to the bitmap data such as characters or graphics.
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Control the engine and send the generated bitmap data as a video signal.
The control panel is controlled by communicating with the engine CPU to display LCD messages,
light the LEDs and display the button status, etc.
The power for the main PCB is supplied from the engine through the engine interface connector.
[ 2 ] Circuit
(1) CPU
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Model name:
VR5500, core
MIPS 64bit RISC CPU manufactured by NEC
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Clock speed:
89MHz (external) / 266MHz (internal)
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Cache memory:
32KB (Command cache) / 32KB (Data cache)
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Bus width:
32bit (external) / 64bit (internal)
Internal Floating Point Unit (FPU)
(2) ASIC block
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Model name:
PD800268F1 manufactured by NEC
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Appearance:
316pin BGA
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Functions:
* Controls CPU
* Controls memory
* Controls interrupts
* Timer
* External interfaces (Centronics, PCI, IDE, Compact Flash, USB)
* Engine interface (Video signal control, LVDS)
* Supports Software
(3) ROM block
The ROM stores the CPU control program and font data. ROMs used are an 16Mbytes flash
ROM, and an 8 Mbytes flash ROM which can be rewritten on the board.
<Masked ROM>
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Model name: S29GL128N90TFIR20H
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Access time:
less than 90nsec.
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Appearance: 56pin
TSOP
<Flash ROM>
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Model name: S29GL064M90TCIR20 manufactured by SPANSION
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Access time:
less than 90nsec.
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Appearance: 48-pin
TSOP
Summary of Contents for MFC-9420CN
Page 1: ...Confidential FACSIMILE EQUIPMENT SERVICE MANUAL MODELS MFC 9420CN ...
Page 16: ...Confidential CHAPTER 1 PARTS NAMES FUNCTIONS ...
Page 22: ...Confidential CHAPTER 2 SPECIFICATIONS ...
Page 33: ...Confidential CHAPTER 3 THEORY OF OPERATION ...
Page 48: ...Confidential 3 1 4 CBV DBV Fig 3 16 Y M C K Fig 3 17 ...
Page 69: ...Confidential 3 3 5 Fig 3 35 ...
Page 73: ...Confidential 3 3 9 3 Interface Circuit Printer side Fig 3 38 ...
Page 82: ...Confidential CHAPTER 4 TRANSFER OF DATA LEFT IN THE MACHINE TO BE SENT FOR REPAIR ...
Page 85: ...Confidential 4 2 Cover page sample End page sample Fig 4 1 ...
Page 86: ...Confidential CHAPTER 5 DISASSEMBLY REASSEMBLY AND LUBRICATION ...
Page 94: ...Confidential 5 5 5 1 1 AC Cord 1 Disconnect AC cord from the machine Fig 5 1 AC cord Machine ...
Page 175: ...Confidential CHAPTER 6 ADJUSTMENTS AND UPDATING OF SETTINGS REQUIRED AFTER PARTS REPLACEMENT ...
Page 203: ...Confidential CHAPTER 7 CLEANING ...
Page 205: ...Confidential CHAPTER 8 MAINTENANCE MODE ...
Page 213: ...8 6 Confidential Fig 8 2 Scanning Compensation Data List a b c d e f g h i j k l m n q ...
Page 224: ...8 17 Confidential Cover page sample End page sample Fig 8 8 ...
Page 255: ...Confidential CHAPTER 9 ERROR INDICATION AND TROUBLESHOOTING ...
Page 279: ...Confidential 9 23 2 Image failure 1 2 3 4 5 6 7 8 9 10 11 12 13 14 ...
Page 280: ...Confidential 9 24 15 a 15 b 16 17 18 19 20 21 22 23 24 25 Fig 9 1 ...
Page 325: ...App 1 5 Confidential 6 Transfer Unit X X X X X X 7 1 2 3 Location SERIAL NO YEAR MONTH DATE ...
Page 398: ...B Power Supply PCB 100V 127V Confidential ...