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41388601TH Rev.2 14 /
Figure 2.3
The engine control block (PU) is controlled by the engine control board (K73 PWB) which consists
of a CPU (MSM66Q577), general LSI chip, flash ROM, EEPROM, pulse motor drivers, and video
memory (see Figure 2.3).
(1) CPU
This, a 16-bit CPU with an AD converter (OKI MIM66Q577), controls the entire system.
(2) General LSI
This LSI (MG63P011-001LA), which is contained in the printer engine control block,
incorporates 4 megabits of video memory and has functions such as engine-controller
interfacing, LED interfacing, motor control, sensor input, video memory control, main scan
color misalignment correction, skew correction and high-voltage power supply control.
2.2 Engine Control Board (K73 PWB)
K Head I/F
Y Head I/F
M Head I/F
C Head I/F
Motor Driver
Motor Driver
DC Motor Driver
DC Motor
(Geared Motor)
9x Pulse Motors
LSI
(VIDEO MEM
Containing
4Mbit DRAM)
High-Voltage Power Supply
Serial Interface (2 channels)
Toner and ID sensors ID check
CU I/F
Fuse Cut Driver
EEPROM
D/A
48MHz
32bit Video I/F
Heater control
CPU BUS
Control Panel
8Mbit(1MByte)
FLASH
CPU
MSM66Q577
A/D CON
Duplex
Cassette 2/3
28MHz
Paper Feed System Sensors
(Paper Feed, Paper Registration and Eject Sensors)
MT Sensor (Stage position and paper empty)
Cassette 1 Sensor (Paper empty and near empty)
Shutter, clutch, belt and fuser checks
Cassette size
Analog output
(Color registration sensor adjustment)
Analog input
(Temperature change)
Analog Input
Switch
Analog input (OHP)
Analog input (Various densities)
Fan control
Cover front/upper open
Stacker full
Test switch
(Power supply cooling)
Motor interruption
UART interruption
256Kbit(32KByte)
SRAM
×
2