Chapter 2
2-31
This regulator IC generates the ASIC internal driving and DDR-SDRAM power supply (2.5V).
g) 1.25V regulator IC (IC4)
This regulator IC generates the termination power supply and reference power supply (1.25V).
2.4.3 Engine Controller
2.4.3.1 Engine controller components
0009-1526
F-2-32
a) CPU (IC1)
The CPU, with a 32-bit internal bus, operates in synchronization with the 132-MHz internal clock that is generated from a 66-MHz external clock.
The CPU is used 8-MB SDRAM (IC2), and 32-KB EEPROM (IC28). The CPU performs parameter control and has the following functions.
Timer function
This function is used for the cleaning functions.
The internal RTC and lithium battery allow the timer to operate even when the AC power supply is off for performing the cleaning function.
EEPROM control function
In addition to the EEPROM with on-board, it controls the six color independent ink tank EEPROM, maintenance cartridge EEPROM, and head EEPROM.
Ink tank level detection
This function detects the remaining ink level for each color based on the signals from the electrodes mounted on the hollow needle.
b) ASIC (IC4)
The ASIC, with a 32-bit internal bus, operates in synchronization with the 100-MHz internal clock that is generated from a 50-MHz external clock.
It uses four 32MB SDRAMs and two 8MB SDRAMs having the following functions:
System controller communication control
This function controls communication with the system controller.
Image data reception
Receives image data from the system controller, stores in SDRAM (IC15, IC16), and then converts to image data and stores in SDRAM (IC11, IC12, IC13,
IC14).
Image data generation/output
This function generates the image data for printing each color from the image data received from the system controller and mask pattern corresponding to
the print mode in the SDRAM (IC11, IC12, IC13, IC14) and stores it in SDRAM (IC15, IC16).
This function also controls the output of the generated image data to the carriage relay PCB.
Heat enable signal control
This functions uses the pulse width to perform variable control of the time that the heat enable signal is applied to the nozzle heater board for each nozzle
array in the printhead.
Linear scale count
This function reads the linear scale during carriage driving and generates the 150dpi timing signal.
2400-dpi timing generation
This function divides the linear scale 150-dpi timing into sixteen equal parts to generate the 2400-dpi timing signal.
Dot count
This function counts the discharge dots used as information for the heat enable signal function, maintenance jet control, cleaning function, and remaining
ink level for each nozzle array.
PWM control
This function performs driving control of the carriage motor, and suction fan and temperature control of the printhead based on the control signals from
the CPU.
Feed motor control
IC23
IC36
IC13
IC16
IC15
IC20 IC21 IC19 IC18
IC17
IC31
IC9
IC25
IC30
IC10
IC27
IC29
IC14
IC12
IC11
IC2
IC3
IC6
IC5
IC1
IC4
IC28 IC24
IC34 IC26
IC8
Summary of Contents for WS8400
Page 1: ...Apr 5 2005 Service Manual W8400 Series W8400...
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Page 12: ...Contents...
Page 13: ...Chapter 1 PRODUCT DESCRIPTION...
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Page 21: ...Chapter 1 1 5 F 1 9...
Page 47: ...Chapter 2 TECHNICAL REFERENCE...
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Page 91: ...Chapter 3 INSTALLATION...
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Page 97: ...Chapter 4 DISASSEMBLY REASSEMBLY...
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Page 147: ...Chapter 6 TROUBLESHOOTING...
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Page 193: ...Chapter 6 6 43 F 6 8 Cover switch tool Cover switch tool...
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Page 195: ...Chapter 7 SERVICE MODE...
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Page 213: ...Chapter 8 ERROR CODE...
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