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• 2-4. LP Engine Control Block
•High Voltage Development Clock Control
It generates control pulse signals with a High Voltage Supply.
•LSU Control
It generates control pulse signals and control a LSU Scan Motor such as observing abnormal
rotation, etc. It also controls Laser output signals for synchronizing horizontal lines.
rotation, etc. It also controls Laser output signals for synchronizing horizontal lines.
•Fuser Control
It controls on/off of Fuser heater with a Low Voltage Power Supply.
2-5. PC Interface Block
•IEEE1284
It proceeds handshaking conforms to IEEE1284 requirement and transfers data, such as a
receiving data from PC (Printer Interface) or a transmit scanned data to PC (PC Scanner).
It is complied with Compatibility Mode, Nibble Mode, Byte Mode, ECP Mode.
receiving data from PC (Printer Interface) or a transmit scanned data to PC (PC Scanner).
It is complied with Compatibility Mode, Nibble Mode, Byte Mode, ECP Mode.
3. System Memory
This system consists of the following memories.
•F-ROM (IC5)
→
F-ROM (2MB) for programming and data backup.
The program is downloaded from PC via IEEE1284 parallel port.
•S-DRAM (IC6)
→
Work RAM, Page Memory, Line Memory, Image Data Memory, Buffer
(8MB) for transmission and reception. During an electrical power failure, the image data is not
backed up.
backed up.
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